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angular/adev/src/content/tutorials/first-app/steps/14-http/README.md_0_535 | # Add HTTP communication to your app
This tutorial demonstrates how to integrate HTTP and an API into your app.
Up until this point your app has read data from a static array in an Angular service. The next step is to use a JSON server that your app will communicate with over HTTP. The HTTP request will simulate the experience of working with data from a server.
<docs-video src="https://www.youtube.com/embed/5K10oYJ5Y-E?si=TiuNKx_teR9baO7k"/>
IMPORTANT: We recommend using your local environment for this step of the tutorial.
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} |
angular/adev/src/content/tutorials/first-app/steps/14-http/README.md_536_9428 | ## What you'll learn
Your app will use data from a JSON server
<docs-workflow>
<docs-step title="Configure the JSON server">
JSON Server is an open source tool used to create mock REST APIs. You'll use it to serve the housing location data that is currently stored in the housing service.
1. Install `json-server` from npm by using the following command.
<docs-code language="bash">
npm install -g json-server
</docs-code>
1. In the root directory of your project, create a file called `db.json`. This is where you will store the data for the `json-server`.
1. Open `db.json` and copy the following code into the file
<docs-code language="json">
{
"locations": [
{
"id": 0,
"name": "Acme Fresh Start Housing",
"city": "Chicago",
"state": "IL",
"photo": "https://angular.dev/assets/images/tutorials/common/bernard-hermant-CLKGGwIBTaY-unsplash.jpg",
"availableUnits": 4,
"wifi": true,
"laundry": true
},
{
"id": 1,
"name": "A113 Transitional Housing",
"city": "Santa Monica",
"state": "CA",
"photo": "https://angular.dev/assets/images/tutorials/common/brandon-griggs-wR11KBaB86U-unsplash.jpg",
"availableUnits": 0,
"wifi": false,
"laundry": true
},
{
"id": 2,
"name": "Warm Beds Housing Support",
"city": "Juneau",
"state": "AK",
"photo": "https://angular.dev/assets/images/tutorials/common/i-do-nothing-but-love-lAyXdl1-Wmc-unsplash.jpg",
"availableUnits": 1,
"wifi": false,
"laundry": false
},
{
"id": 3,
"name": "Homesteady Housing",
"city": "Chicago",
"state": "IL",
"photo": "https://angular.dev/assets/images/tutorials/common/ian-macdonald-W8z6aiwfi1E-unsplash.jpg",
"availableUnits": 1,
"wifi": true,
"laundry": false
},
{
"id": 4,
"name": "Happy Homes Group",
"city": "Gary",
"state": "IN",
"photo": "https://angular.dev/assets/images/tutorials/common/krzysztof-hepner-978RAXoXnH4-unsplash.jpg",
"availableUnits": 1,
"wifi": true,
"laundry": false
},
{
"id": 5,
"name": "Hopeful Apartment Group",
"city": "Oakland",
"state": "CA",
"photo": "https://angular.dev/assets/images/tutorials/common/r-architecture-JvQ0Q5IkeMM-unsplash.jpg",
"availableUnits": 2,
"wifi": true,
"laundry": true
},
{
"id": 6,
"name": "Seriously Safe Towns",
"city": "Oakland",
"state": "CA",
"photo": "https://angular.dev/assets/images/tutorials/common/phil-hearing-IYfp2Ixe9nM-unsplash.jpg",
"availableUnits": 5,
"wifi": true,
"laundry": true
},
{
"id": 7,
"name": "Hopeful Housing Solutions",
"city": "Oakland",
"state": "CA",
"photo": "https://angular.dev/assets/images/tutorials/common/r-architecture-GGupkreKwxA-unsplash.jpg",
"availableUnits": 2,
"wifi": true,
"laundry": true
},
{
"id": 8,
"name": "Seriously Safe Towns",
"city": "Oakland",
"state": "CA",
"photo": "https://angular.dev/assets/images/tutorials/common/saru-robert-9rP3mxf8qWI-unsplash.jpg",
"availableUnits": 10,
"wifi": false,
"laundry": false
},
{
"id": 9,
"name": "Capital Safe Towns",
"city": "Portland",
"state": "OR",
"photo": "https://angular.dev/assets/images/tutorials/common/webaliser-_TPTXZd9mOo-unsplash.jpg",
"availableUnits": 6,
"wifi": true,
"laundry": true
}
]
}
</docs-code>
1. Save this file.
1. Time to test your configuration. From the command line, at the root of your project run the following commands.
<docs-code language="bash">
json-server --watch db.json
</docs-code>
1. In your web browser, navigate to the `http://localhost:3000/locations` and confirm that the response includes the data stored in `db.json`.
If you have any trouble with your configuration, you can find more details in the [official documentation](https://www.npmjs.com/package/json-server).
</docs-step>
<docs-step title="Update service to use web server instead of local array">
The data source has been configured, the next step is to update your web app to connect to it use the data.
1. In `src/app/housing.service.ts`, make the following changes:
1. Update the code to remove `housingLocationList` property and the array containing the data.
1. Add a string property called `url` and set its value to `'http://localhost:3000/locations'`
<docs-code language="javascript">
url = 'http://localhost:3000/locations';
</docs-code>
This code will result in errors in the rest of the file because it depends on the `housingLocationList` property. We're going to update the service methods next.
1. Update the `getAllHousingLocations` function to make a call to the web server you configured.
<docs-code header="" path="adev/src/content/tutorials/first-app/steps/14-http/src-final/app/housing.service.ts" visibleLines="[10,13]"/>
The code now uses asynchronous code to make a **GET** request over HTTP.
HELPFUL: For this example, the code uses `fetch`. For more advanced use cases consider using `HttpClient` provided by Angular.
1. Update the `getHousingLocationsById` function to make a call to the web server you configured.
<docs-code header="" path="adev/src/content/tutorials/first-app/steps/14-http/src-final/app/housing.service.ts" visibleLines="[15,18]"/>
1. Once all the updates are complete, your updated service should match the following code.
<docs-code header="Final version of housing.service.ts" path="adev/src/content/tutorials/first-app/steps/14-http/src-final/app/housing.service.ts" visibleLines="[1,24]" />
</docs-step>
<docs-step title="Update the components to use asynchronous calls to the housing service">
The server is now reading data from the HTTP request but the components that rely on the service now have errors because they were programmed to use the synchronous version of the service.
1. In `src/app/home/home.component.ts`, update the `constructor` to use the new asynchronous version of the `getAllHousingLocations` method.
<docs-code header="" path="adev/src/content/tutorials/first-app/steps/14-http/src-final/app/home/home.component.ts" visibleLines="[32,37]"/>
1. In `src/app/details/details.component.ts`, update the `constructor` to use the new asynchronous version of the `getHousingLocationById` method.
<docs-code header="" path="adev/src/content/tutorials/first-app/steps/14-http/src-final/app/details/details.component.ts" visibleLines="[61,66]"/>
1. Save your code.
1. Open the application in the browser and confirm that it runs without any errors.
</docs-step>
</docs-workflow>
Note: This lesson relies on the `fetch` browser API. For the support of interceptors, please refer to the [Http Client documentation](/guide/http)
Summary: In this lesson, you updated your app to use a local web server (`json-server`), and use asynchronous service methods to retrieve data.
Congratulations! You've successfully completed this tutorial and are ready to continue your journey with building even more complex Angular Apps.
If you would like to learn more, please consider completing some of Angular's other developer [tutorials](tutorials) and [guides](overview).
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} |
angular/adev/src/content/tutorials/first-app/steps/14-http/src-final/index.html_0_427 | <!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Homes</title>
<base href="/">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="icon" type="image/x-icon" href="favicon.ico">
<link href="https://fonts.googleapis.com/css2?family=Be+Vietnam+Pro:ital,wght@0,400;0,700;1,400;1,700&display=swap" rel="stylesheet">
</head>
<body>
<app-root></app-root>
</body>
</html>
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} |
angular/adev/src/content/tutorials/first-app/steps/14-http/src-final/main.ts_0_536 | /*
* Protractor support is deprecated in Angular.
* Protractor is used in this example for compatibility with Angular documentation tools.
*/
import {bootstrapApplication, provideProtractorTestingSupport} from '@angular/platform-browser';
import {AppComponent} from './app/app.component';
import {provideRouter} from '@angular/router';
import routeConfig from './app/routes';
bootstrapApplication(AppComponent, {
providers: [provideProtractorTestingSupport(), provideRouter(routeConfig)],
}).catch((err) => console.error(err));
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} |
angular/adev/src/content/tutorials/first-app/steps/14-http/src-final/styles.css_0_443 | /* You can add global styles to this file, and also import other style files */
* {
margin: 0;
padding: 0;
}
body {
font-family: 'Be Vietnam Pro', sans-serif;
}
:root {
--primary-color: #605DC8;
--secondary-color: #8B89E6;
--accent-color: #e8e7fa;
--shadow-color: #E8E8E8;
}
button.primary {
padding: 10px;
border: solid 1px var(--primary-color);
background: var(--primary-color);
color: white;
border-radius: 8px;
}
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} |
angular/adev/src/content/tutorials/first-app/steps/14-http/src-final/app/routes.ts_0_389 | import {Routes} from '@angular/router';
import {HomeComponent} from './home/home.component';
import {DetailsComponent} from './details/details.component';
const routeConfig: Routes = [
{
path: '',
component: HomeComponent,
title: 'Home page',
},
{
path: 'details/:id',
component: DetailsComponent,
title: 'Home details',
},
];
export default routeConfig;
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angular/adev/src/content/tutorials/first-app/steps/14-http/src-final/app/housinglocation.ts_0_180 | export interface HousingLocation {
id: number;
name: string;
city: string;
state: string;
photo: string;
availableUnits: number;
wifi: boolean;
laundry: boolean;
}
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} |
angular/adev/src/content/tutorials/first-app/steps/14-http/src-final/app/housing.service.ts_0_687 | import {Injectable} from '@angular/core';
import {HousingLocation} from './housinglocation';
@Injectable({
providedIn: 'root',
})
export class HousingService {
url = 'http://localhost:3000/locations';
async getAllHousingLocations(): Promise<HousingLocation[]> {
const data = await fetch(this.url);
return (await data.json()) ?? [];
}
async getHousingLocationById(id: number): Promise<HousingLocation | undefined> {
const data = await fetch(`${this.url}/${id}`);
return (await data.json()) ?? {};
}
submitApplication(firstName: string, lastName: string, email: string) {
// tslint:disable-next-line
console.log(firstName, lastName, email);
}
}
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angular/adev/src/content/tutorials/first-app/steps/14-http/src-final/app/app.component.ts_0_671 | import {Component} from '@angular/core';
import {HomeComponent} from './home/home.component';
import {RouterLink, RouterOutlet} from '@angular/router';
@Component({
selector: 'app-root',
standalone: true,
imports: [HomeComponent, RouterLink, RouterOutlet],
template: `
<main>
<a [routerLink]="['/']">
<header class="brand-name">
<img class="brand-logo" src="/assets/logo.svg" alt="logo" aria-hidden="true" />
</header>
</a>
<section class="content">
<router-outlet></router-outlet>
</section>
</main>
`,
styleUrls: ['./app.component.css'],
})
export class AppComponent {
title = 'homes';
}
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} |
angular/adev/src/content/tutorials/first-app/steps/14-http/src-final/app/app.component.css_0_213 | :host {
--content-padding: 10px;
}
header {
display: block;
height: 60px;
padding: var(--content-padding);
box-shadow: 0px 5px 25px var(--shadow-color);
}
.content {
padding: var(--content-padding);
}
| {
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} |
angular/adev/src/content/tutorials/first-app/steps/14-http/src-final/app/home/home.component.ts_0_1615 | import {Component, inject} from '@angular/core';
import {CommonModule} from '@angular/common';
import {HousingLocationComponent} from '../housing-location/housing-location.component';
import {HousingLocation} from '../housinglocation';
import {HousingService} from '../housing.service';
@Component({
selector: 'app-home',
standalone: true,
imports: [CommonModule, HousingLocationComponent],
template: `
<section>
<form>
<input type="text" placeholder="Filter by city" #filter />
<button class="primary" type="button" (click)="filterResults(filter.value)">Search</button>
</form>
</section>
<section class="results">
<app-housing-location
*ngFor="let housingLocation of filteredLocationList"
[housingLocation]="housingLocation"
></app-housing-location>
</section>
`,
styleUrls: ['./home.component.css'],
})
export class HomeComponent {
housingLocationList: HousingLocation[] = [];
housingService: HousingService = inject(HousingService);
filteredLocationList: HousingLocation[] = [];
constructor() {
this.housingService.getAllHousingLocations().then((housingLocationList: HousingLocation[]) => {
this.housingLocationList = housingLocationList;
this.filteredLocationList = housingLocationList;
});
}
filterResults(text: string) {
if (!text) {
this.filteredLocationList = this.housingLocationList;
return;
}
this.filteredLocationList = this.housingLocationList.filter((housingLocation) =>
housingLocation?.city.toLowerCase().includes(text.toLowerCase()),
);
}
}
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} |
angular/adev/src/content/tutorials/first-app/steps/14-http/src-final/app/home/home.component.css_0_746 | .results {
display: grid;
column-gap: 14px;
row-gap: 14px;
grid-template-columns: repeat(auto-fill, minmax(400px, 400px));
margin-top: 50px;
justify-content: space-around;
}
input[type="text"] {
border: solid 1px var(--primary-color);
padding: 10px;
border-radius: 8px;
margin-right: 4px;
display: inline-block;
width: 30%;
}
button {
padding: 10px;
border: solid 1px var(--primary-color);
background: var(--primary-color);
color: white;
border-radius: 8px;
}
@media (min-width: 500px) and (max-width: 768px) {
.results {
grid-template-columns: repeat(2, 1fr);
}
input[type="text"] {
width: 70%;
}
}
@media (max-width: 499px) {
.results {
grid-template-columns: 1fr;
}
}
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} |
angular/adev/src/content/tutorials/first-app/steps/14-http/src-final/app/housing-location/housing-location.component.css_0_583 | .listing {
background: var(--accent-color);
border-radius: 30px;
padding-bottom: 30px;
}
.listing-heading {
color: var(--primary-color);
padding: 10px 20px 0 20px;
}
.listing-photo {
height: 250px;
width: 100%;
object-fit: cover;
border-radius: 30px 30px 0 0;
}
.listing-location {
padding: 10px 20px 20px 20px;
}
.listing-location::before {
content: url("/assets/location-pin.svg") / "";
}
section.listing a {
padding-left: 20px;
text-decoration: none;
color: var(--primary-color);
}
section.listing a::after {
content: "\203A";
margin-left: 5px;
}
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"url": "https://github.com/angular/angular/blob/main/adev/src/content/tutorials/first-app/steps/14-http/src-final/app/housing-location/housing-location.component.css"
} |
angular/adev/src/content/tutorials/first-app/steps/14-http/src-final/app/housing-location/housing-location.component.ts_0_908 | import {Component, Input} from '@angular/core';
import {CommonModule} from '@angular/common';
import {HousingLocation} from '../housinglocation';
import {RouterModule} from '@angular/router';
@Component({
selector: 'app-housing-location',
standalone: true,
imports: [CommonModule, RouterModule],
template: `
<section class="listing">
<img
class="listing-photo"
[src]="housingLocation.photo"
alt="Exterior photo of {{ housingLocation.name }}"
crossorigin
/>
<h2 class="listing-heading">{{ housingLocation.name }}</h2>
<p class="listing-location">{{ housingLocation.city }}, {{ housingLocation.state }}</p>
<a [routerLink]="['/details', housingLocation.id]">Learn More</a>
</section>
`,
styleUrls: ['./housing-location.component.css'],
})
export class HousingLocationComponent {
@Input() housingLocation!: HousingLocation;
}
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} |
angular/adev/src/content/tutorials/first-app/steps/14-http/src-final/app/details/details.component.ts_0_2718 | import {Component, inject} from '@angular/core';
import {CommonModule} from '@angular/common';
import {ActivatedRoute} from '@angular/router';
import {HousingService} from '../housing.service';
import {HousingLocation} from '../housinglocation';
import {FormControl, FormGroup, ReactiveFormsModule} from '@angular/forms';
@Component({
selector: 'app-details',
standalone: true,
imports: [CommonModule, ReactiveFormsModule],
template: `
<article>
<img
class="listing-photo"
[src]="housingLocation?.photo"
alt="Exterior photo of {{ housingLocation?.name }}"
crossorigin
/>
<section class="listing-description">
<h2 class="listing-heading">{{ housingLocation?.name }}</h2>
<p class="listing-location">{{ housingLocation?.city }}, {{ housingLocation?.state }}</p>
</section>
<section class="listing-features">
<h2 class="section-heading">About this housing location</h2>
<ul>
<li>Units available: {{ housingLocation?.availableUnits }}</li>
<li>Does this location have wifi: {{ housingLocation?.wifi }}</li>
<li>Does this location have laundry: {{ housingLocation?.laundry }}</li>
</ul>
</section>
<section class="listing-apply">
<h2 class="section-heading">Apply now to live here</h2>
<form [formGroup]="applyForm" (submit)="submitApplication()">
<label for="first-name">First Name</label>
<input id="first-name" type="text" formControlName="firstName" />
<label for="last-name">Last Name</label>
<input id="last-name" type="text" formControlName="lastName" />
<label for="email">Email</label>
<input id="email" type="email" formControlName="email" />
<button type="submit" class="primary">Apply now</button>
</form>
</section>
</article>
`,
styleUrls: ['./details.component.css'],
})
export class DetailsComponent {
route: ActivatedRoute = inject(ActivatedRoute);
housingService = inject(HousingService);
housingLocation: HousingLocation | undefined;
applyForm = new FormGroup({
firstName: new FormControl(''),
lastName: new FormControl(''),
email: new FormControl(''),
});
constructor() {
const housingLocationId = parseInt(this.route.snapshot.params['id'], 10);
this.housingService.getHousingLocationById(housingLocationId).then((housingLocation) => {
this.housingLocation = housingLocation;
});
}
submitApplication() {
this.housingService.submitApplication(
this.applyForm.value.firstName ?? '',
this.applyForm.value.lastName ?? '',
this.applyForm.value.email ?? '',
);
}
}
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} |
angular/adev/src/content/tutorials/first-app/steps/14-http/src-final/app/details/details.component.css_0_1075 | .listing-photo {
height: 600px;
width: 50%;
object-fit: cover;
border-radius: 30px;
float: right;
}
.listing-heading {
font-size: 48pt;
font-weight: bold;
margin-bottom: 15px;
}
.listing-location::before {
content: url('/assets/location-pin.svg') / '';
}
.listing-location {
font-size: 24pt;
margin-bottom: 15px;
}
.listing-features > .section-heading {
color: var(--secondary-color);
font-size: 24pt;
margin-bottom: 15px;
}
.listing-features {
margin-bottom: 20px;
}
.listing-features li {
font-size: 14pt;
}
li {
list-style-type: none;
}
.listing-apply .section-heading {
font-size: 18pt;
margin-bottom: 15px;
}
label, input {
display: block;
}
label {
color: var(--secondary-color);
font-weight: bold;
text-transform: uppercase;
font-size: 12pt;
}
input {
font-size: 16pt;
margin-bottom: 15px;
padding: 10px;
width: 400px;
border-top: none;
border-right: none;
border-left: none;
border-bottom: solid .3px;
}
@media (max-width: 1024px) {
.listing-photo {
width: 100%;
height: 400px;
}
}
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angular/adev/src/content/tutorials/first-app/steps/14-http/src-final/assets/location-pin.svg_0_502 | <?xml version="1.0" encoding="UTF-8"?>
<svg width="20pt" height="20pt" version="1.1" viewBox="0 0 100 100" xmlns="http://www.w3.org/2000/svg">
<path d="m50 11.602c-15.398 0-27.898 12.5-27.898 27.898 0 5 1.3008 9.6992 3.6016 13.801l2.8984 4.1992 21.398 30.898 21.801-31.398 2.1992-3.1992c2.5-4.1992 3.8984-9 3.8984-14.199 0-15.5-12.5-28-27.898-28zm0 35.598c-4.1992 0-7.6992-3.3984-7.6992-7.6992s3.3984-7.6992 7.6992-7.6992 7.6992 3.3984 7.6992 7.6992-3.5 7.6992-7.6992 7.6992z" fill="#605cc8"/>
</svg>
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} |
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angular/adev/src/content/tutorials/first-app/steps/14-http/src/index.html_0_427 | <!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Homes</title>
<base href="/">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="icon" type="image/x-icon" href="favicon.ico">
<link href="https://fonts.googleapis.com/css2?family=Be+Vietnam+Pro:ital,wght@0,400;0,700;1,400;1,700&display=swap" rel="stylesheet">
</head>
<body>
<app-root></app-root>
</body>
</html>
| {
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"url": "https://github.com/angular/angular/blob/main/adev/src/content/tutorials/first-app/steps/14-http/src/index.html"
} |
angular/adev/src/content/tutorials/first-app/steps/14-http/src/main.ts_0_536 | /*
* Protractor support is deprecated in Angular.
* Protractor is used in this example for compatibility with Angular documentation tools.
*/
import {bootstrapApplication, provideProtractorTestingSupport} from '@angular/platform-browser';
import {AppComponent} from './app/app.component';
import {provideRouter} from '@angular/router';
import routeConfig from './app/routes';
bootstrapApplication(AppComponent, {
providers: [provideProtractorTestingSupport(), provideRouter(routeConfig)],
}).catch((err) => console.error(err));
| {
"end_byte": 536,
"start_byte": 0,
"url": "https://github.com/angular/angular/blob/main/adev/src/content/tutorials/first-app/steps/14-http/src/main.ts"
} |
angular/adev/src/content/tutorials/first-app/steps/14-http/src/styles.css_0_443 | /* You can add global styles to this file, and also import other style files */
* {
margin: 0;
padding: 0;
}
body {
font-family: 'Be Vietnam Pro', sans-serif;
}
:root {
--primary-color: #605DC8;
--secondary-color: #8B89E6;
--accent-color: #e8e7fa;
--shadow-color: #E8E8E8;
}
button.primary {
padding: 10px;
border: solid 1px var(--primary-color);
background: var(--primary-color);
color: white;
border-radius: 8px;
}
| {
"end_byte": 443,
"start_byte": 0,
"url": "https://github.com/angular/angular/blob/main/adev/src/content/tutorials/first-app/steps/14-http/src/styles.css"
} |
angular/adev/src/content/tutorials/first-app/steps/14-http/src/app/routes.ts_0_389 | import {Routes} from '@angular/router';
import {HomeComponent} from './home/home.component';
import {DetailsComponent} from './details/details.component';
const routeConfig: Routes = [
{
path: '',
component: HomeComponent,
title: 'Home page',
},
{
path: 'details/:id',
component: DetailsComponent,
title: 'Home details',
},
];
export default routeConfig;
| {
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"start_byte": 0,
"url": "https://github.com/angular/angular/blob/main/adev/src/content/tutorials/first-app/steps/14-http/src/app/routes.ts"
} |
angular/adev/src/content/tutorials/first-app/steps/14-http/src/app/housinglocation.ts_0_180 | export interface HousingLocation {
id: number;
name: string;
city: string;
state: string;
photo: string;
availableUnits: number;
wifi: boolean;
laundry: boolean;
}
| {
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"start_byte": 0,
"url": "https://github.com/angular/angular/blob/main/adev/src/content/tutorials/first-app/steps/14-http/src/app/housinglocation.ts"
} |
angular/adev/src/content/tutorials/first-app/steps/14-http/src/app/housing.service.ts_0_3183 | import {Injectable} from '@angular/core';
import {HousingLocation} from './housinglocation';
@Injectable({
providedIn: 'root',
})
export class HousingService {
readonly baseUrl = 'https://angular.dev/assets/images/tutorials/common';
protected housingLocationList: HousingLocation[] = [
{
id: 0,
name: 'Acme Fresh Start Housing',
city: 'Chicago',
state: 'IL',
photo: `${this.baseUrl}/bernard-hermant-CLKGGwIBTaY-unsplash.jpg`,
availableUnits: 4,
wifi: true,
laundry: true,
},
{
id: 1,
name: 'A113 Transitional Housing',
city: 'Santa Monica',
state: 'CA',
photo: `${this.baseUrl}/brandon-griggs-wR11KBaB86U-unsplash.jpg`,
availableUnits: 0,
wifi: false,
laundry: true,
},
{
id: 2,
name: 'Warm Beds Housing Support',
city: 'Juneau',
state: 'AK',
photo: `${this.baseUrl}/i-do-nothing-but-love-lAyXdl1-Wmc-unsplash.jpg`,
availableUnits: 1,
wifi: false,
laundry: false,
},
{
id: 3,
name: 'Homesteady Housing',
city: 'Chicago',
state: 'IL',
photo: `${this.baseUrl}/ian-macdonald-W8z6aiwfi1E-unsplash.jpg`,
availableUnits: 1,
wifi: true,
laundry: false,
},
{
id: 4,
name: 'Happy Homes Group',
city: 'Gary',
state: 'IN',
photo: `${this.baseUrl}/krzysztof-hepner-978RAXoXnH4-unsplash.jpg`,
availableUnits: 1,
wifi: true,
laundry: false,
},
{
id: 5,
name: 'Hopeful Apartment Group',
city: 'Oakland',
state: 'CA',
photo: `${this.baseUrl}/r-architecture-JvQ0Q5IkeMM-unsplash.jpg`,
availableUnits: 2,
wifi: true,
laundry: true,
},
{
id: 6,
name: 'Seriously Safe Towns',
city: 'Oakland',
state: 'CA',
photo: `${this.baseUrl}/phil-hearing-IYfp2Ixe9nM-unsplash.jpg`,
availableUnits: 5,
wifi: true,
laundry: true,
},
{
id: 7,
name: 'Hopeful Housing Solutions',
city: 'Oakland',
state: 'CA',
photo: `${this.baseUrl}/r-architecture-GGupkreKwxA-unsplash.jpg`,
availableUnits: 2,
wifi: true,
laundry: true,
},
{
id: 8,
name: 'Seriously Safe Towns',
city: 'Oakland',
state: 'CA',
photo: `${this.baseUrl}/saru-robert-9rP3mxf8qWI-unsplash.jpg`,
availableUnits: 10,
wifi: false,
laundry: false,
},
{
id: 9,
name: 'Capital Safe Towns',
city: 'Portland',
state: 'OR',
photo: `${this.baseUrl}/webaliser-_TPTXZd9mOo-unsplash.jpg`,
availableUnits: 6,
wifi: true,
laundry: true,
},
];
getAllHousingLocations(): HousingLocation[] {
return this.housingLocationList;
}
getHousingLocationById(id: number): HousingLocation | undefined {
return this.housingLocationList.find((housingLocation) => housingLocation.id === id);
}
submitApplication(firstName: string, lastName: string, email: string) {
console.log(
`Homes application received: firstName: ${firstName}, lastName: ${lastName}, email: ${email}.`,
);
}
}
| {
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"start_byte": 0,
"url": "https://github.com/angular/angular/blob/main/adev/src/content/tutorials/first-app/steps/14-http/src/app/housing.service.ts"
} |
angular/adev/src/content/tutorials/first-app/steps/14-http/src/app/app.component.ts_0_671 | import {Component} from '@angular/core';
import {HomeComponent} from './home/home.component';
import {RouterLink, RouterOutlet} from '@angular/router';
@Component({
selector: 'app-root',
standalone: true,
imports: [HomeComponent, RouterLink, RouterOutlet],
template: `
<main>
<a [routerLink]="['/']">
<header class="brand-name">
<img class="brand-logo" src="/assets/logo.svg" alt="logo" aria-hidden="true" />
</header>
</a>
<section class="content">
<router-outlet></router-outlet>
</section>
</main>
`,
styleUrls: ['./app.component.css'],
})
export class AppComponent {
title = 'homes';
}
| {
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"start_byte": 0,
"url": "https://github.com/angular/angular/blob/main/adev/src/content/tutorials/first-app/steps/14-http/src/app/app.component.ts"
} |
angular/adev/src/content/tutorials/first-app/steps/14-http/src/app/app.component.css_0_213 | :host {
--content-padding: 10px;
}
header {
display: block;
height: 60px;
padding: var(--content-padding);
box-shadow: 0px 5px 25px var(--shadow-color);
}
.content {
padding: var(--content-padding);
}
| {
"end_byte": 213,
"start_byte": 0,
"url": "https://github.com/angular/angular/blob/main/adev/src/content/tutorials/first-app/steps/14-http/src/app/app.component.css"
} |
angular/adev/src/content/tutorials/first-app/steps/14-http/src/app/home/home.component.ts_0_1531 | import {Component, inject} from '@angular/core';
import {CommonModule} from '@angular/common';
import {HousingLocationComponent} from '../housing-location/housing-location.component';
import {HousingLocation} from '../housinglocation';
import {HousingService} from '../housing.service';
@Component({
selector: 'app-home',
standalone: true,
imports: [CommonModule, HousingLocationComponent],
template: `
<section>
<form>
<input type="text" placeholder="Filter by city" #filter />
<button class="primary" type="button" (click)="filterResults(filter.value)">Search</button>
</form>
</section>
<section class="results">
<app-housing-location
*ngFor="let housingLocation of filteredLocationList"
[housingLocation]="housingLocation"
></app-housing-location>
</section>
`,
styleUrls: ['./home.component.css'],
})
export class HomeComponent {
housingLocationList: HousingLocation[] = [];
housingService: HousingService = inject(HousingService);
filteredLocationList: HousingLocation[] = [];
constructor() {
this.housingLocationList = this.housingService.getAllHousingLocations();
this.filteredLocationList = this.housingLocationList;
}
filterResults(text: string) {
if (!text) {
this.filteredLocationList = this.housingLocationList;
return;
}
this.filteredLocationList = this.housingLocationList.filter((housingLocation) =>
housingLocation?.city.toLowerCase().includes(text.toLowerCase()),
);
}
}
| {
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"url": "https://github.com/angular/angular/blob/main/adev/src/content/tutorials/first-app/steps/14-http/src/app/home/home.component.ts"
} |
angular/adev/src/content/tutorials/first-app/steps/14-http/src/app/home/home.component.css_0_746 | .results {
display: grid;
column-gap: 14px;
row-gap: 14px;
grid-template-columns: repeat(auto-fill, minmax(400px, 400px));
margin-top: 50px;
justify-content: space-around;
}
input[type="text"] {
border: solid 1px var(--primary-color);
padding: 10px;
border-radius: 8px;
margin-right: 4px;
display: inline-block;
width: 30%;
}
button {
padding: 10px;
border: solid 1px var(--primary-color);
background: var(--primary-color);
color: white;
border-radius: 8px;
}
@media (min-width: 500px) and (max-width: 768px) {
.results {
grid-template-columns: repeat(2, 1fr);
}
input[type="text"] {
width: 70%;
}
}
@media (max-width: 499px) {
.results {
grid-template-columns: 1fr;
}
}
| {
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"url": "https://github.com/angular/angular/blob/main/adev/src/content/tutorials/first-app/steps/14-http/src/app/home/home.component.css"
} |
angular/adev/src/content/tutorials/first-app/steps/14-http/src/app/housing-location/housing-location.component.css_0_583 | .listing {
background: var(--accent-color);
border-radius: 30px;
padding-bottom: 30px;
}
.listing-heading {
color: var(--primary-color);
padding: 10px 20px 0 20px;
}
.listing-photo {
height: 250px;
width: 100%;
object-fit: cover;
border-radius: 30px 30px 0 0;
}
.listing-location {
padding: 10px 20px 20px 20px;
}
.listing-location::before {
content: url("/assets/location-pin.svg") / "";
}
section.listing a {
padding-left: 20px;
text-decoration: none;
color: var(--primary-color);
}
section.listing a::after {
content: "\203A";
margin-left: 5px;
}
| {
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"url": "https://github.com/angular/angular/blob/main/adev/src/content/tutorials/first-app/steps/14-http/src/app/housing-location/housing-location.component.css"
} |
angular/adev/src/content/tutorials/first-app/steps/14-http/src/app/housing-location/housing-location.component.ts_0_908 | import {Component, Input} from '@angular/core';
import {CommonModule} from '@angular/common';
import {HousingLocation} from '../housinglocation';
import {RouterModule} from '@angular/router';
@Component({
selector: 'app-housing-location',
standalone: true,
imports: [CommonModule, RouterModule],
template: `
<section class="listing">
<img
class="listing-photo"
[src]="housingLocation.photo"
alt="Exterior photo of {{ housingLocation.name }}"
crossorigin
/>
<h2 class="listing-heading">{{ housingLocation.name }}</h2>
<p class="listing-location">{{ housingLocation.city }}, {{ housingLocation.state }}</p>
<a [routerLink]="['/details', housingLocation.id]">Learn More</a>
</section>
`,
styleUrls: ['./housing-location.component.css'],
})
export class HousingLocationComponent {
@Input() housingLocation!: HousingLocation;
}
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"url": "https://github.com/angular/angular/blob/main/adev/src/content/tutorials/first-app/steps/14-http/src/app/housing-location/housing-location.component.ts"
} |
angular/adev/src/content/tutorials/first-app/steps/14-http/src/app/details/details.component.ts_0_2660 | import {Component, inject} from '@angular/core';
import {CommonModule} from '@angular/common';
import {ActivatedRoute} from '@angular/router';
import {HousingService} from '../housing.service';
import {HousingLocation} from '../housinglocation';
import {FormControl, FormGroup, ReactiveFormsModule} from '@angular/forms';
@Component({
selector: 'app-details',
standalone: true,
imports: [CommonModule, ReactiveFormsModule],
template: `
<article>
<img
class="listing-photo"
[src]="housingLocation?.photo"
alt="Exterior photo of {{ housingLocation?.name }}"
crossorigin
/>
<section class="listing-description">
<h2 class="listing-heading">{{ housingLocation?.name }}</h2>
<p class="listing-location">{{ housingLocation?.city }}, {{ housingLocation?.state }}</p>
</section>
<section class="listing-features">
<h2 class="section-heading">About this housing location</h2>
<ul>
<li>Units available: {{ housingLocation?.availableUnits }}</li>
<li>Does this location have wifi: {{ housingLocation?.wifi }}</li>
<li>Does this location have laundry: {{ housingLocation?.laundry }}</li>
</ul>
</section>
<section class="listing-apply">
<h2 class="section-heading">Apply now to live here</h2>
<form [formGroup]="applyForm" (submit)="submitApplication()">
<label for="first-name">First Name</label>
<input id="first-name" type="text" formControlName="firstName" />
<label for="last-name">Last Name</label>
<input id="last-name" type="text" formControlName="lastName" />
<label for="email">Email</label>
<input id="email" type="email" formControlName="email" />
<button type="submit" class="primary">Apply now</button>
</form>
</section>
</article>
`,
styleUrls: ['./details.component.css'],
})
export class DetailsComponent {
route: ActivatedRoute = inject(ActivatedRoute);
housingService = inject(HousingService);
housingLocation: HousingLocation | undefined;
applyForm = new FormGroup({
firstName: new FormControl(''),
lastName: new FormControl(''),
email: new FormControl(''),
});
constructor() {
const housingLocationId = parseInt(this.route.snapshot.params['id'], 10);
this.housingLocation = this.housingService.getHousingLocationById(housingLocationId);
}
submitApplication() {
this.housingService.submitApplication(
this.applyForm.value.firstName ?? '',
this.applyForm.value.lastName ?? '',
this.applyForm.value.email ?? '',
);
}
}
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} |
angular/adev/src/content/tutorials/first-app/steps/14-http/src/app/details/details.component.css_0_1075 | .listing-photo {
height: 600px;
width: 50%;
object-fit: cover;
border-radius: 30px;
float: right;
}
.listing-heading {
font-size: 48pt;
font-weight: bold;
margin-bottom: 15px;
}
.listing-location::before {
content: url('/assets/location-pin.svg') / '';
}
.listing-location {
font-size: 24pt;
margin-bottom: 15px;
}
.listing-features > .section-heading {
color: var(--secondary-color);
font-size: 24pt;
margin-bottom: 15px;
}
.listing-features {
margin-bottom: 20px;
}
.listing-features li {
font-size: 14pt;
}
li {
list-style-type: none;
}
.listing-apply .section-heading {
font-size: 18pt;
margin-bottom: 15px;
}
label, input {
display: block;
}
label {
color: var(--secondary-color);
font-weight: bold;
text-transform: uppercase;
font-size: 12pt;
}
input {
font-size: 16pt;
margin-bottom: 15px;
padding: 10px;
width: 400px;
border-top: none;
border-right: none;
border-left: none;
border-bottom: solid .3px;
}
@media (max-width: 1024px) {
.listing-photo {
width: 100%;
height: 400px;
}
}
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} |
angular/adev/src/content/tutorials/first-app/steps/14-http/src/assets/location-pin.svg_0_502 | <?xml version="1.0" encoding="UTF-8"?>
<svg width="20pt" height="20pt" version="1.1" viewBox="0 0 100 100" xmlns="http://www.w3.org/2000/svg">
<path d="m50 11.602c-15.398 0-27.898 12.5-27.898 27.898 0 5 1.3008 9.6992 3.6016 13.801l2.8984 4.1992 21.398 30.898 21.801-31.398 2.1992-3.1992c2.5-4.1992 3.8984-9 3.8984-14.199 0-15.5-12.5-28-27.898-28zm0 35.598c-4.1992 0-7.6992-3.3984-7.6992-7.6992s3.3984-7.6992 7.6992-7.6992 7.6992 3.3984 7.6992 7.6992-3.5 7.6992-7.6992 7.6992z" fill="#605cc8"/>
</svg>
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"url": "https://github.com/angular/angular/blob/main/adev/src/content/tutorials/first-app/steps/14-http/src/assets/location-pin.svg"
} |
angular/adev/src/content/tutorials/first-app/steps/14-http/src/assets/logo.svg_0_2207 | <svg width="151" height="44" viewBox="0 0 151 44" fill="none" xmlns="http://www.w3.org/2000/svg">
<path fill-rule="evenodd" clip-rule="evenodd" d="M6.15532 33.2946C5.25369 33.2946 4.58006 32.5707 4.58006 31.6701V24.0152C4.58006 19.5469 4.35206 20.6276 7.59585 17.4236C21.7317 4.06732 16.2425 4.24744 29.6149 18.054C32.0434 20.7627 31.9985 19.4534 31.9985 23.8316V31.6667C31.9985 32.5707 31.28 33.2912 30.3749 33.2912H6.15532V33.2946Z" fill="#605DC8"/>
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} |
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} |
angular/adev/src/content/tutorials/first-app/steps/14-http/src/assets/logo.svg_6612_6619 | </svg>
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"url": "https://github.com/angular/angular/blob/main/adev/src/content/tutorials/first-app/steps/14-http/src/assets/logo.svg"
} |
angular/adev/src/content/tutorials/learn-angular/BUILD.bazel_0_407 | load("//adev/shared-docs:index.bzl", "generate_guides", "generate_tutorial")
package(default_visibility = ["//adev:__subpackages__"])
generate_guides(
name = "learn-angular-guides",
srcs = glob(["**/*.md"]),
)
filegroup(
name = "files",
srcs = glob(
["**/*"],
exclude = ["**/*.md"],
),
)
generate_tutorial(
name = "learn-angular",
tutorial_srcs = ":files",
)
| {
"end_byte": 407,
"start_byte": 0,
"url": "https://github.com/angular/angular/blob/main/adev/src/content/tutorials/learn-angular/BUILD.bazel"
} |
angular/adev/src/content/tutorials/learn-angular/intro/README.md_0_476 | # Welcome to the Angular tutorial
This interactive tutorial will teach you the basic building blocks to start building great apps with Angular.
## How to use this tutorial
You'll need to have basic familiarity with HTML, CSS and JavaScript to understand Angular.
Each step represents a concept in Angular. You can do one, or all of them.
If you get stuck, click "Reveal answer" at the top.
Alright, let's [get started](/tutorials/learn-angular/1-components-in-angular).
| {
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"start_byte": 0,
"url": "https://github.com/angular/angular/blob/main/adev/src/content/tutorials/learn-angular/intro/README.md"
} |
angular/adev/src/content/tutorials/learn-angular/intro/src/app/app.component.ts_0_174 | import {Component} from '@angular/core';
@Component({
selector: 'app-root',
template: `
Welcome to Angular!
`,
standalone: true,
})
export class AppComponent {}
| {
"end_byte": 174,
"start_byte": 0,
"url": "https://github.com/angular/angular/blob/main/adev/src/content/tutorials/learn-angular/intro/src/app/app.component.ts"
} |
angular/adev/src/content/tutorials/learn-angular/common/idx/dev.nix_0_1086 | # To learn more about how to use Nix to configure your environment
# see: https://developers.google.com/idx/guides/customize-idx-env
{ pkgs, ... }: {
# Which nixpkgs channel to use.
channel = "stable-23.11"; # or "unstable"
# Use https://search.nixos.org/packages to find packages
packages = [
pkgs.nodejs_18
];
# Sets environment variables in the workspace
env = {};
idx = {
# Search for the extensions you want on https://open-vsx.org/ and use "publisher.id"
extensions = [
"angular.ng-template"
];
workspace = {
# Runs when a workspace is first created with this \`dev.nix\` file
onCreate = {
npm-install = "npm install --no-audit --prefer-offline";
};
# To run something each time the environment is rebuilt, use the \`onStart\` hook
};
# Enable previews and customize configuration
previews = {
enable = true;
previews = {
web = {
command = ["npm" "run" "start" "--" "--port" "$PORT" "--host" "0.0.0.0"];
manager = "web";
};
};
};
};
} | {
"end_byte": 1086,
"start_byte": 0,
"url": "https://github.com/angular/angular/blob/main/adev/src/content/tutorials/learn-angular/common/idx/dev.nix"
} |
angular/adev/src/content/tutorials/learn-angular/steps/4-control-flow-if/README.md_0_1915 | # Control Flow in Components - `@if`
Deciding what to display on the screen for a user is a common task in application development. Many times, the decision is made programmatically using conditions.
To express conditional displays in templates, Angular uses the `@if` template syntax.
In this activity, you'll learn how to use conditionals in templates.
<hr/>
The syntax that enables the conditional display of elements in a template is `@if`.
Here's an example of how to use the `@if` syntax in a component:
```angular-ts
@Component({
...
template: `
@if (isLoggedIn) {
<p>Welcome back, Friend!</p>
}
`,
})
class AppComponent {
isLoggedIn = true;
}
```
Two things to take note of:
- There is an `@` prefix for the `if` because it is a special type of syntax called [Angular template syntax](guide/templates)
- For applications using v16 and older please refer to the [Angular documentation for NgIf](guide/directives/structural-directives) for more information.
<docs-workflow>
<docs-step title="Create a property called `isServerRunning`">
In the `AppComponent` class, add a `boolean` property called `isServerRunning`, set the initial value to `true`.
</docs-step>
<docs-step title="Use `@if` in the template">
Update the template to display the message `Yes, the server is running` if the value of `isServerRunning` is `true`.
</docs-step>
<docs-step title="Use `@else` in the template">
Now Angular supports native template syntax for defining the else case with the `@else` syntax. Update the template to display the message `No, the server is not running` as the else case.
Here's an example:
```angular-ts
template: `
@if (isServerRunning) { ... }
@else { ... }
`;
```
Add your code to fill in the missing markup.
</docs-step>
</docs-workflow>
This type of functionality is called conditional control flow. Next you'll learn how to repeat items in a template.
| {
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"start_byte": 0,
"url": "https://github.com/angular/angular/blob/main/adev/src/content/tutorials/learn-angular/steps/4-control-flow-if/README.md"
} |
angular/adev/src/content/tutorials/learn-angular/steps/4-control-flow-if/answer/src/app/app.component.ts_0_316 | import {Component} from '@angular/core';
@Component({
selector: 'app-root',
template: `
@if (isServerRunning) {
<span>Yes, the server is running</span>
} @else {
<span>No, the server is not running</span>
}
`,
standalone: true,
})
export class AppComponent {
isServerRunning = true;
}
| {
"end_byte": 316,
"start_byte": 0,
"url": "https://github.com/angular/angular/blob/main/adev/src/content/tutorials/learn-angular/steps/4-control-flow-if/answer/src/app/app.component.ts"
} |
angular/adev/src/content/tutorials/learn-angular/steps/4-control-flow-if/src/app/app.component.ts_0_230 | import {Component} from '@angular/core';
@Component({
selector: 'app-root',
template: `
<span>Yes, the server is running</span>
`,
standalone: true,
})
export class AppComponent {
// add the boolean property here
}
| {
"end_byte": 230,
"start_byte": 0,
"url": "https://github.com/angular/angular/blob/main/adev/src/content/tutorials/learn-angular/steps/4-control-flow-if/src/app/app.component.ts"
} |
angular/adev/src/content/tutorials/learn-angular/steps/14-routerLink/README.md_0_1688 | # Use RouterLink for Navigation
In the app's current state, the entire page refreshes when we click on an internal link that exists within the app. While this may not seem significant with a small app, this can have performance implications for larger pages with more content where users have to redownload assets and run calculations again.
In this activity, you'll learn how to leverage the `RouterLink` directive to make the most use of Angular Router.
<hr>
<docs-workflow>
<docs-step title="Import `RouterLink` directive">
In `app.component.ts` add the `RouterLink` directive import to the existing import statement from `@angular/router` and add it to the `imports` array of your component decorator.
```ts
...
import { RouterLink, RouterOutlet } from '@angular/router';
@Component({
standalone: true,
imports: [RouterLink, RouterOutlet],
...
})
```
</docs-step>
<docs-step title="Add a `routerLink` to template">
To use the `RouterLink` directive, replace the `href` attributes with `routerLink`. Update the template with this change.
```angular-ts
import { RouterLink, RouterOutlet } from '@angular/router';
@Component({
...
standalone: true,
template: `
...
<a routerLink="/">Home</a>
<a routerLink="/user">User</a>
...
`,
imports: [RouterLink, RouterOutlet],
})
```
</docs-step>
</docs-workflow>
When you click on the links in the navigation now, you should not see any blinking and only the content of the page itself (i.e., `router-outlet`) being changed 🎉
Great job learning about routing with Angular. This is just the surface of the `Router` API, to learn more check out the [Angular Router Documentation](guide/routing).
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} |
angular/adev/src/content/tutorials/learn-angular/steps/14-routerLink/answer/src/main.ts_0_241 | import {bootstrapApplication} from '@angular/platform-browser';
import {AppComponent} from './app/app.component';
import {appConfig} from './app/app.config';
bootstrapApplication(AppComponent, appConfig).catch((err) => console.error(err));
| {
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"url": "https://github.com/angular/angular/blob/main/adev/src/content/tutorials/learn-angular/steps/14-routerLink/answer/src/main.ts"
} |
angular/adev/src/content/tutorials/learn-angular/steps/14-routerLink/answer/src/app/app.routes.ts_0_349 | import {Routes} from '@angular/router';
import {HomeComponent} from './home/home.component';
import {UserComponent} from './user/user.component';
export const routes: Routes = [
{
path: '',
title: 'App Home Page',
component: HomeComponent,
},
{
path: 'user',
title: 'App User Page',
component: UserComponent,
},
];
| {
"end_byte": 349,
"start_byte": 0,
"url": "https://github.com/angular/angular/blob/main/adev/src/content/tutorials/learn-angular/steps/14-routerLink/answer/src/app/app.routes.ts"
} |
angular/adev/src/content/tutorials/learn-angular/steps/14-routerLink/answer/src/app/app.component.ts_0_368 | import {Component} from '@angular/core';
import {RouterOutlet, RouterLink} from '@angular/router';
@Component({
selector: 'app-root',
template: `
<nav>
<a routerLink="/">Home</a>
|
<a routerLink="/user">User</a>
</nav>
<router-outlet />
`,
standalone: true,
imports: [RouterOutlet, RouterLink],
})
export class AppComponent {}
| {
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"start_byte": 0,
"url": "https://github.com/angular/angular/blob/main/adev/src/content/tutorials/learn-angular/steps/14-routerLink/answer/src/app/app.component.ts"
} |
angular/adev/src/content/tutorials/learn-angular/steps/14-routerLink/answer/src/app/app.config.ts_0_222 | import {ApplicationConfig} from '@angular/core';
import {provideRouter} from '@angular/router';
import {routes} from './app.routes';
export const appConfig: ApplicationConfig = {
providers: [provideRouter(routes)],
};
| {
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"start_byte": 0,
"url": "https://github.com/angular/angular/blob/main/adev/src/content/tutorials/learn-angular/steps/14-routerLink/answer/src/app/app.config.ts"
} |
angular/adev/src/content/tutorials/learn-angular/steps/14-routerLink/answer/src/app/home/home.component.ts_0_176 | import {Component} from '@angular/core';
@Component({
selector: 'app-home',
template: `
<div>Home Page</div>
`,
standalone: true,
})
export class HomeComponent {}
| {
"end_byte": 176,
"start_byte": 0,
"url": "https://github.com/angular/angular/blob/main/adev/src/content/tutorials/learn-angular/steps/14-routerLink/answer/src/app/home/home.component.ts"
} |
angular/adev/src/content/tutorials/learn-angular/steps/14-routerLink/answer/src/app/user/user.component.ts_0_218 | import {Component} from '@angular/core';
@Component({
selector: 'app-user',
template: `
<div>Username: {{ username }}</div>
`,
standalone: true,
})
export class UserComponent {
username = 'youngTech';
}
| {
"end_byte": 218,
"start_byte": 0,
"url": "https://github.com/angular/angular/blob/main/adev/src/content/tutorials/learn-angular/steps/14-routerLink/answer/src/app/user/user.component.ts"
} |
angular/adev/src/content/tutorials/learn-angular/steps/14-routerLink/src/main.ts_0_241 | import {bootstrapApplication} from '@angular/platform-browser';
import {AppComponent} from './app/app.component';
import {appConfig} from './app/app.config';
bootstrapApplication(AppComponent, appConfig).catch((err) => console.error(err));
| {
"end_byte": 241,
"start_byte": 0,
"url": "https://github.com/angular/angular/blob/main/adev/src/content/tutorials/learn-angular/steps/14-routerLink/src/main.ts"
} |
angular/adev/src/content/tutorials/learn-angular/steps/14-routerLink/src/app/app.routes.ts_0_349 | import {Routes} from '@angular/router';
import {HomeComponent} from './home/home.component';
import {UserComponent} from './user/user.component';
export const routes: Routes = [
{
path: '',
title: 'App Home Page',
component: HomeComponent,
},
{
path: 'user',
title: 'App User Page',
component: UserComponent,
},
];
| {
"end_byte": 349,
"start_byte": 0,
"url": "https://github.com/angular/angular/blob/main/adev/src/content/tutorials/learn-angular/steps/14-routerLink/src/app/app.routes.ts"
} |
angular/adev/src/content/tutorials/learn-angular/steps/14-routerLink/src/app/app.component.ts_0_332 | import {Component} from '@angular/core';
import {RouterOutlet} from '@angular/router';
@Component({
selector: 'app-root',
template: `
<nav>
<a href="/">Home</a>
|
<a href="/user">User</a>
</nav>
<router-outlet />
`,
standalone: true,
imports: [RouterOutlet],
})
export class AppComponent {}
| {
"end_byte": 332,
"start_byte": 0,
"url": "https://github.com/angular/angular/blob/main/adev/src/content/tutorials/learn-angular/steps/14-routerLink/src/app/app.component.ts"
} |
angular/adev/src/content/tutorials/learn-angular/steps/14-routerLink/src/app/app.config.ts_0_222 | import {ApplicationConfig} from '@angular/core';
import {provideRouter} from '@angular/router';
import {routes} from './app.routes';
export const appConfig: ApplicationConfig = {
providers: [provideRouter(routes)],
};
| {
"end_byte": 222,
"start_byte": 0,
"url": "https://github.com/angular/angular/blob/main/adev/src/content/tutorials/learn-angular/steps/14-routerLink/src/app/app.config.ts"
} |
angular/adev/src/content/tutorials/learn-angular/steps/14-routerLink/src/app/home/home.component.ts_0_176 | import {Component} from '@angular/core';
@Component({
selector: 'app-home',
template: `
<div>Home Page</div>
`,
standalone: true,
})
export class HomeComponent {}
| {
"end_byte": 176,
"start_byte": 0,
"url": "https://github.com/angular/angular/blob/main/adev/src/content/tutorials/learn-angular/steps/14-routerLink/src/app/home/home.component.ts"
} |
angular/adev/src/content/tutorials/learn-angular/steps/14-routerLink/src/app/user/user.component.ts_0_218 | import {Component} from '@angular/core';
@Component({
selector: 'app-user',
template: `
<div>Username: {{ username }}</div>
`,
standalone: true,
})
export class UserComponent {
username = 'youngTech';
}
| {
"end_byte": 218,
"start_byte": 0,
"url": "https://github.com/angular/angular/blob/main/adev/src/content/tutorials/learn-angular/steps/14-routerLink/src/app/user/user.component.ts"
} |
angular/adev/src/content/tutorials/learn-angular/steps/12-enable-routing/README.md_0_2169 | # Routing Overview
For most apps, there comes a point where the app requires more than a single page. When that time inevitably comes, routing becomes a big part of the performance story for users.
In this activity, you'll learn how to setup and configure your app to use Angular Router.
<hr>
<docs-workflow>
<docs-step title="Create an app.routes.ts file">
Inside `app.routes.ts`, make the following changes:
1. Import `Routes` from the `@angular/router` package.
1. Export a constant called `routes` of type `Routes`, assign it `[]` as the value.
```ts
import {Routes} from '@angular/router';
export const routes: Routes = [];
```
</docs-step>
<docs-step title="Add routing to provider">
In `app.config.ts`, configure the app to Angular Router with the following steps:
1. Import the `provideRouter` function from `@angular/router`.
1. Import `routes` from the `./app.routes.ts`.
1. Call the `provideRouter` function with `routes` passed in as an argument in the `providers` array.
<docs-code language="ts" highlight="[2,3,6]">
import {ApplicationConfig} from '@angular/core';
import {provideRouter} from '@angular/router';
import {routes} from './app.routes';
export const appConfig: ApplicationConfig = {
providers: [provideRouter(routes)],
};
</docs-code>
</docs-step>
<docs-step title="Import `RouterOutlet` in the component">
Finally, to make sure your app is ready to use the Angular Router, you need to tell the app where you expect the router to display the desired content. Accomplish that by using the `RouterOutlet` directive from `@angular/router`.
Update the template for `AppComponent` by adding `<router-outlet />`
<docs-code language="angular-ts" highlight="[11]">
import {RouterOutlet} from '@angular/router';
@Component({
...
template: `
<nav>
<a href="/">Home</a>
|
<a href="/user">User</a>
</nav>
<router-outlet />
`,
standalone: true,
imports: [RouterOutlet],
})
export class AppComponent {}
</docs-code>
</docs-step>
</docs-workflow>
Your app is now setup to use Angular Router. Nice work! 🙌
Keep the momentum going to learn the next step of defining the routes for our app.
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} |
angular/adev/src/content/tutorials/learn-angular/steps/12-enable-routing/answer/src/main.ts_0_241 | import {bootstrapApplication} from '@angular/platform-browser';
import {AppComponent} from './app/app.component';
import {appConfig} from './app/app.config';
bootstrapApplication(AppComponent, appConfig).catch((err) => console.error(err));
| {
"end_byte": 241,
"start_byte": 0,
"url": "https://github.com/angular/angular/blob/main/adev/src/content/tutorials/learn-angular/steps/12-enable-routing/answer/src/main.ts"
} |
angular/adev/src/content/tutorials/learn-angular/steps/12-enable-routing/answer/src/app/app.routes.ts_0_75 | import {Routes} from '@angular/router';
export const routes: Routes = [];
| {
"end_byte": 75,
"start_byte": 0,
"url": "https://github.com/angular/angular/blob/main/adev/src/content/tutorials/learn-angular/steps/12-enable-routing/answer/src/app/app.routes.ts"
} |
angular/adev/src/content/tutorials/learn-angular/steps/12-enable-routing/answer/src/app/app.component.ts_0_332 | import {Component} from '@angular/core';
import {RouterOutlet} from '@angular/router';
@Component({
selector: 'app-root',
template: `
<nav>
<a href="/">Home</a>
|
<a href="/user">User</a>
</nav>
<router-outlet />
`,
standalone: true,
imports: [RouterOutlet],
})
export class AppComponent {}
| {
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} |
angular/adev/src/content/tutorials/learn-angular/steps/12-enable-routing/answer/src/app/app.config.ts_0_222 | import {ApplicationConfig} from '@angular/core';
import {provideRouter} from '@angular/router';
import {routes} from './app.routes';
export const appConfig: ApplicationConfig = {
providers: [provideRouter(routes)],
};
| {
"end_byte": 222,
"start_byte": 0,
"url": "https://github.com/angular/angular/blob/main/adev/src/content/tutorials/learn-angular/steps/12-enable-routing/answer/src/app/app.config.ts"
} |
angular/adev/src/content/tutorials/learn-angular/steps/12-enable-routing/answer/src/app/home/home.component.ts_0_176 | import {Component} from '@angular/core';
@Component({
selector: 'app-home',
template: `
<div>Home Page</div>
`,
standalone: true,
})
export class HomeComponent {}
| {
"end_byte": 176,
"start_byte": 0,
"url": "https://github.com/angular/angular/blob/main/adev/src/content/tutorials/learn-angular/steps/12-enable-routing/answer/src/app/home/home.component.ts"
} |
angular/adev/src/content/tutorials/learn-angular/steps/12-enable-routing/answer/src/app/user/user.component.ts_0_218 | import {Component} from '@angular/core';
@Component({
selector: 'app-user',
template: `
<div>Username: {{ username }}</div>
`,
standalone: true,
})
export class UserComponent {
username = 'youngTech';
}
| {
"end_byte": 218,
"start_byte": 0,
"url": "https://github.com/angular/angular/blob/main/adev/src/content/tutorials/learn-angular/steps/12-enable-routing/answer/src/app/user/user.component.ts"
} |
angular/adev/src/content/tutorials/learn-angular/steps/12-enable-routing/src/main.ts_0_241 | import {bootstrapApplication} from '@angular/platform-browser';
import {AppComponent} from './app/app.component';
import {appConfig} from './app/app.config';
bootstrapApplication(AppComponent, appConfig).catch((err) => console.error(err));
| {
"end_byte": 241,
"start_byte": 0,
"url": "https://github.com/angular/angular/blob/main/adev/src/content/tutorials/learn-angular/steps/12-enable-routing/src/main.ts"
} |
angular/adev/src/content/tutorials/learn-angular/steps/12-enable-routing/src/app/app.component.ts_0_310 | import {Component} from '@angular/core';
import {RouterOutlet} from '@angular/router';
@Component({
selector: 'app-root',
template: `
<nav>
<a href="/">Home</a>
|
<a href="/user">User</a>
</nav>
`,
standalone: true,
imports: [RouterOutlet],
})
export class AppComponent {}
| {
"end_byte": 310,
"start_byte": 0,
"url": "https://github.com/angular/angular/blob/main/adev/src/content/tutorials/learn-angular/steps/12-enable-routing/src/app/app.component.ts"
} |
angular/adev/src/content/tutorials/learn-angular/steps/12-enable-routing/src/app/app.config.ts_0_116 | import {ApplicationConfig} from '@angular/core';
export const appConfig: ApplicationConfig = {
providers: [],
};
| {
"end_byte": 116,
"start_byte": 0,
"url": "https://github.com/angular/angular/blob/main/adev/src/content/tutorials/learn-angular/steps/12-enable-routing/src/app/app.config.ts"
} |
angular/adev/src/content/tutorials/learn-angular/steps/12-enable-routing/src/app/home/home.component.ts_0_176 | import {Component} from '@angular/core';
@Component({
selector: 'app-home',
template: `
<div>Home Page</div>
`,
standalone: true,
})
export class HomeComponent {}
| {
"end_byte": 176,
"start_byte": 0,
"url": "https://github.com/angular/angular/blob/main/adev/src/content/tutorials/learn-angular/steps/12-enable-routing/src/app/home/home.component.ts"
} |
angular/adev/src/content/tutorials/learn-angular/steps/12-enable-routing/src/app/user/user.component.ts_0_218 | import {Component} from '@angular/core';
@Component({
selector: 'app-user',
template: `
<div>Username: {{ username }}</div>
`,
standalone: true,
})
export class UserComponent {
username = 'youngTech';
}
| {
"end_byte": 218,
"start_byte": 0,
"url": "https://github.com/angular/angular/blob/main/adev/src/content/tutorials/learn-angular/steps/12-enable-routing/src/app/user/user.component.ts"
} |
angular/adev/src/content/tutorials/learn-angular/steps/10-deferrable-views/README.md_0_6035 | # Deferrable Views
Sometimes in app development, you end up with a lot of components that you need to reference in your app, but some of those don't need to be loaded right away for various reasons.
Maybe they are below the visible fold or are heavy components that aren't interacted with until later. In that case, we can load some of those resources later with deferrable views.
In this activity, you'll learn how to use deferrable views to defer load a section of your component template.
<hr>
<docs-workflow>
<docs-step title="Add a `@defer` block around the comments component">
In your app, the blog post page has a comment component after the post details.
Wrap the comment component with a `@defer` block to defer load it.
```angular-html
@defer {
<comments />
}
```
The code above is an example of how to use a basic `@defer` block. By default `@defer` will load the `comments` component when the browser is idle.
</docs-step>
<docs-step title="Add a placeholder">
Add a `@placeholder` block to the `@defer` block. The `@placeholder` block is where you put html that will show before the deferred loading starts. The content in `@placeholder` blocks is eagerly loaded.
<docs-code language="angular-html" highlight="[3,4,5]">
@defer {
<comments />
} @placeholder {
<p>Future comments</p>
}
</docs-code>
</docs-step>
<docs-step title="Add a loading block">
Add a `@loading` block to the `@defer` block. The `@loading` block is where you put html that will show _while_ the deferred content is actively being fetched, but hasn't finished yet. The content in `@loading` blocks is eagerly loaded.
<docs-code language="angular-html" highlight="[5,6,7]">
@defer {
<comments />
} @placeholder {
<p>Future comments</p>
} @loading {
<p>Loading comments...</p>
}
</docs-code>
</docs-step>
<docs-step title="Add a minimum duration">
Both `@placeholder` and `@loading` sections have optional parameters to prevent flickering from occurring when loading happens quickly. `@placeholder` has `minimum` and `@loading` has `minimum` and `after`. Add a `minimum` duration to the `@loading` block so it will be rendered for at least 2 seconds.
<docs-code language="angular-html" highlight="[5]">
@defer {
<comments />
} @placeholder {
<p>Future comments</p>
} @loading (minimum 2s) {
<p>Loading comments...</p>
}
</docs-code>
</docs-step>
<docs-step title="Add a viewport trigger">
Deferrable views have a number of trigger options. Add a viewport trigger so the content will defer load once it enters the viewport.
<docs-code language="angular-html" highlight="[1]">
@defer (on viewport) {
<comments />
}
</docs-code>
</docs-step>
<docs-step title="Add content">
A viewport trigger is best used when you're deferring content that's far enough down the page that it needs to be scrolled to see. So let's add some content to our blog post. You can either write your own, or you can copy the content below and put it inside the `<article>` element.
<docs-code language="html" highlight="[1]">
<article>
<p>Angular is my favorite framework, and this is why. Angular has the coolest deferrable view feature that makes defer loading content the easiest and most ergonomic it could possibly be. The Angular community is also filled with amazing contributors and experts that create excellent content. The community is welcoming and friendly, and it really is the best community out there.</p>
<p>I can't express enough how much I enjoy working with Angular. It offers the best developer experience I've ever had. I love that the Angular team puts their developers first and takes care to make us very happy. They genuinely want Angular to be the best framework it can be, and they're doing such an amazing job at it, too. This statement comes from my heart and is not at all copied and pasted. In fact, I think I'll say these exact same things again a few times.</p>
<p>Angular is my favorite framework, and this is why. Angular has the coolest deferrable view feature that makes defer loading content the easiest and most ergonomic it could possibly be. The Angular community is also filled with amazing contributors and experts that create excellent content. The community is welcoming and friendly, and it really is the best community out there.</p>
<p>I can't express enough how much I enjoy working with Angular. It offers the best developer experience I've ever had. I love that the Angular team puts their developers first and takes care to make us very happy. They genuinely want Angular to be the best framework it can be, and they're doing such an amazing job at it, too. This statement comes from my heart and is not at all copied and pasted. In fact, I think I'll say these exact same things again a few times.</p>
<p>Angular is my favorite framework, and this is why. Angular has the coolest deferrable view feature that makes defer loading content the easiest and most ergonomic it could possibly be. The Angular community is also filled with amazing contributors and experts that create excellent content. The community is welcoming and friendly, and it really is the best community out there.</p>
<p>I can't express enough how much I enjoy working with Angular. It offers the best developer experience I've ever had. I love that the Angular team puts their developers first and takes care to make us very happy. They genuinely want Angular to be the best framework it can be, and they're doing such an amazing job at it, too. This statement comes from my heart and is not at all copied and pasted.</p>
</article>
</docs-code>
Once you've added this code, now scroll down to see the deferred content load once you scroll it into the viewport.
</docs-step>
</docs-workflow>
In the activity, you've learned how to use deferrable views in your applications. Great work. 🙌
There's even more you can do with them, like different triggers, prefetching, and `@error` blocks.
If you would like to learn more, check out the [documentation for Deferrable views](guide/defer).
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} |
angular/adev/src/content/tutorials/learn-angular/steps/10-deferrable-views/answer/src/main.ts_0_241 | import {bootstrapApplication} from '@angular/platform-browser';
import {AppComponent} from './app/app.component';
import {appConfig} from './app/app.config';
bootstrapApplication(AppComponent, appConfig).catch((err) => console.error(err));
| {
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"start_byte": 0,
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} |
angular/adev/src/content/tutorials/learn-angular/steps/10-deferrable-views/answer/src/app/comments.component.ts_0_320 | import {Component} from '@angular/core';
@Component({
selector: 'comments',
template: `
<ul>
<li>Building for the web is fantastic!</li>
<li>The new template syntax is great</li>
<li>I agree with the other comments!</li>
</ul>
`,
standalone: true,
})
export class CommentsComponent {}
| {
"end_byte": 320,
"start_byte": 0,
"url": "https://github.com/angular/angular/blob/main/adev/src/content/tutorials/learn-angular/steps/10-deferrable-views/answer/src/app/comments.component.ts"
} |
angular/adev/src/content/tutorials/learn-angular/steps/10-deferrable-views/answer/src/app/app.component.ts_0_3445 | import {Component} from '@angular/core';
import {CommentsComponent} from './comments.component';
@Component({
selector: 'app-root',
template: `
<div>
<h1>How I feel about Angular</h1>
<article>
<p>
Angular is my favorite framework, and this is why. Angular has the coolest deferrable view
feature that makes defer loading content the easiest and most ergonomic it could possibly
be. The Angular community is also filled with amazing contributors and experts that create
excellent content. The community is welcoming and friendly, and it really is the best
community out there.
</p>
<p>
I can't express enough how much I enjoy working with Angular. It offers the best developer
experience I've ever had. I love that the Angular team puts their developers first and
takes care to make us very happy. They genuinely want Angular to be the best framework it
can be, and they're doing such an amazing job at it, too. This statement comes from my
heart and is not at all copied and pasted. In fact, I think I'll say these exact same
things again a few times.
</p>
<p>
Angular is my favorite framework, and this is why. Angular has the coolest deferrable view
feature that makes defer loading content the easiest and most ergonomic it could possibly
be. The Angular community is also filled with amazing contributors and experts that create
excellent content. The community is welcoming and friendly, and it really is the best
community out there.
</p>
<p>
I can't express enough how much I enjoy working with Angular. It offers the best developer
experience I've ever had. I love that the Angular team puts their developers first and
takes care to make us very happy. They genuinely want Angular to be the best framework it
can be, and they're doing such an amazing job at it, too. This statement comes from my
heart and is not at all copied and pasted. In fact, I think I'll say these exact same
things again a few times.
</p>
<p>
Angular is my favorite framework, and this is why. Angular has the coolest deferrable view
feature that makes defer loading content the easiest and most ergonomic it could possibly
be. The Angular community is also filled with amazing contributors and experts that create
excellent content. The community is welcoming and friendly, and it really is the best
community out there.
</p>
<p>
I can't express enough how much I enjoy working with Angular. It offers the best developer
experience I've ever had. I love that the Angular team puts their developers first and
takes care to make us very happy. They genuinely want Angular to be the best framework it
can be, and they're doing such an amazing job at it, too. This statement comes from my
heart and is not at all copied and pasted.
</p>
</article>
@defer (on viewport) {
<comments />
} @placeholder {
<p>Future comments</p>
} @loading (minimum 2s) {
<p>Loading comments...</p>
}
</div>
`,
standalone: true,
imports: [CommentsComponent],
})
export class AppComponent {}
| {
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"url": "https://github.com/angular/angular/blob/main/adev/src/content/tutorials/learn-angular/steps/10-deferrable-views/answer/src/app/app.component.ts"
} |
angular/adev/src/content/tutorials/learn-angular/steps/10-deferrable-views/answer/src/app/app.config.ts_0_116 | import {ApplicationConfig} from '@angular/core';
export const appConfig: ApplicationConfig = {
providers: [],
};
| {
"end_byte": 116,
"start_byte": 0,
"url": "https://github.com/angular/angular/blob/main/adev/src/content/tutorials/learn-angular/steps/10-deferrable-views/answer/src/app/app.config.ts"
} |
angular/adev/src/content/tutorials/learn-angular/steps/10-deferrable-views/src/main.ts_0_241 | import {bootstrapApplication} from '@angular/platform-browser';
import {AppComponent} from './app/app.component';
import {appConfig} from './app/app.config';
bootstrapApplication(AppComponent, appConfig).catch((err) => console.error(err));
| {
"end_byte": 241,
"start_byte": 0,
"url": "https://github.com/angular/angular/blob/main/adev/src/content/tutorials/learn-angular/steps/10-deferrable-views/src/main.ts"
} |
angular/adev/src/content/tutorials/learn-angular/steps/10-deferrable-views/src/app/comments.component.ts_0_320 | import {Component} from '@angular/core';
@Component({
selector: 'comments',
template: `
<ul>
<li>Building for the web is fantastic!</li>
<li>The new template syntax is great</li>
<li>I agree with the other comments!</li>
</ul>
`,
standalone: true,
})
export class CommentsComponent {}
| {
"end_byte": 320,
"start_byte": 0,
"url": "https://github.com/angular/angular/blob/main/adev/src/content/tutorials/learn-angular/steps/10-deferrable-views/src/app/comments.component.ts"
} |
angular/adev/src/content/tutorials/learn-angular/steps/10-deferrable-views/src/app/app.component.ts_0_344 | import {Component} from '@angular/core';
import {CommentsComponent} from './comments.component';
@Component({
selector: 'app-root',
template: `
<div>
<h1>How I feel about Angular</h1>
<article></article>
<comments />
</div>
`,
standalone: true,
imports: [CommentsComponent],
})
export class AppComponent {}
| {
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"start_byte": 0,
"url": "https://github.com/angular/angular/blob/main/adev/src/content/tutorials/learn-angular/steps/10-deferrable-views/src/app/app.component.ts"
} |
angular/adev/src/content/tutorials/learn-angular/steps/10-deferrable-views/src/app/app.config.ts_0_116 | import {ApplicationConfig} from '@angular/core';
export const appConfig: ApplicationConfig = {
providers: [],
};
| {
"end_byte": 116,
"start_byte": 0,
"url": "https://github.com/angular/angular/blob/main/adev/src/content/tutorials/learn-angular/steps/10-deferrable-views/src/app/app.config.ts"
} |
angular/adev/src/content/tutorials/learn-angular/steps/25-next-steps/README.md_0_834 | # Ready to explore more of Angular?
You can also learn more in our [guides](overview) and [reference](api), or `ng new`.
<docs-card-container>
<docs-card title="What is Angular?" href="overview">
Angular is the web development framework for building modern apps!
</docs-card>
<docs-card title="Angular's Roadmap" href="roadmap">
Read about Angular's open source roadmap including current, future and accomplished projects.
</docs-card>
<docs-card title="Playground" href="playground" link="Start playing">
Play with Angular in your browser!
</docs-card>
<docs-card title="Angular YouTube Course" href="https://youtube.com/playlist?list=PL1w1q3fL4pmj9k1FrJ3Pe91EPub2_h4jF" link="Start learning">
Check out the official Angular YouTube channel for videos, courses and more!
</docs-card>
</docs-card-container>
| {
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"start_byte": 0,
"url": "https://github.com/angular/angular/blob/main/adev/src/content/tutorials/learn-angular/steps/25-next-steps/README.md"
} |
angular/adev/src/content/tutorials/learn-angular/steps/20-inject-based-di/README.md_0_1928 | # Inject-based dependency injection
Creating an injectable service is the first part of the dependency injection (DI) system in Angular. How do you inject a service into a component? Angular has a convenient function called `inject()` that can be used in the proper context.
Note: Injection contexts are beyond the scope of this tutorial, but you can find more information in the [Angular Docs](guide/di/dependency-injection-context) if you would like to learn more.
In this activity, you'll learn how to inject a service and use it in a component.
<hr>
It is often helpful to initialize class properties with values provided by the DI system. Here's an example:
<docs-code language="ts" highlight="[3]">
@Component({...})
class PetCareDashboardComponent {
petRosterService = inject(PetRosterService);
}
</docs-code>
<docs-workflow>
<docs-step title="Inject the `CarService`">
In `app.component.ts`, using the `inject()` function inject the `CarService` and assign it to a property called `carService`
Note: Notice the difference between the property `carService` and the class `CarService`.
</docs-step>
<docs-step title="Use the `carService` instance">
Calling `inject(CarService)` gave you an instance of the `CarService` that you can use in your application, stored in the `carService` property.
In the `constructor` function of the `AppComponent`, add the following implementation:
```ts
constructor() {
this.display = this.carService.getCars().join(' ⭐️ ');
}
```
</docs-step>
<docs-step title="Update the `AppComponent` template">
Update the component template in `app.component.ts` with the following code:
```ts
template: `<p>Car Listing: {{ display }}</p>`,
```
</docs-step>
</docs-workflow>
You've just injected your first service into a component - fantastic effort. Before you finish this section on DI, you'll learn an alternative syntax to inject resources into your components.
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} |
angular/adev/src/content/tutorials/learn-angular/steps/20-inject-based-di/answer/src/app/car.service.ts_0_277 | import {Injectable} from '@angular/core';
@Injectable({
providedIn: 'root',
})
export class CarService {
cars = ['Sunflower GT', 'Flexus Sport', 'Sprout Mach One'];
getCars(): string[] {
return this.cars;
}
getCar(id: number) {
return this.cars[id];
}
}
| {
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"start_byte": 0,
"url": "https://github.com/angular/angular/blob/main/adev/src/content/tutorials/learn-angular/steps/20-inject-based-di/answer/src/app/car.service.ts"
} |
angular/adev/src/content/tutorials/learn-angular/steps/20-inject-based-di/answer/src/app/app.component.ts_0_376 | import {Component, inject} from '@angular/core';
import {CarService} from './car.service';
@Component({
selector: 'app-root',
template: `
<p>Car Listing: {{ display }}</p>
`,
standalone: true,
})
export class AppComponent {
display = '';
carService = inject(CarService);
constructor() {
this.display = this.carService.getCars().join(' ⭐️ ');
}
}
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} |
angular/adev/src/content/tutorials/learn-angular/steps/20-inject-based-di/src/app/car.service.ts_0_277 | import {Injectable} from '@angular/core';
@Injectable({
providedIn: 'root',
})
export class CarService {
cars = ['Sunflower GT', 'Flexus Sport', 'Sprout Mach One'];
getCars(): string[] {
return this.cars;
}
getCar(id: number) {
return this.cars[id];
}
}
| {
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"start_byte": 0,
"url": "https://github.com/angular/angular/blob/main/adev/src/content/tutorials/learn-angular/steps/20-inject-based-di/src/app/car.service.ts"
} |
angular/adev/src/content/tutorials/learn-angular/steps/20-inject-based-di/src/app/app.component.ts_0_234 | import {Component, inject} from '@angular/core';
import {CarService} from './car.service';
@Component({
selector: 'app-root',
template: ``,
standalone: true,
})
export class AppComponent {
display = '';
constructor() {}
}
| {
"end_byte": 234,
"start_byte": 0,
"url": "https://github.com/angular/angular/blob/main/adev/src/content/tutorials/learn-angular/steps/20-inject-based-di/src/app/app.component.ts"
} |
angular/adev/src/content/tutorials/learn-angular/steps/11-optimizing-images/README.md_0_4078 | # Optimizing images
Images are a big part of many applications, and can be a major contributor to application performance problems, including low [Core Web Vitals](https://web.dev/explore/learn-core-web-vitals) scores.
Image optimization can be a complex topic, but Angular handles most of it for you, with the `NgOptimizedImage` directive. In this activity, you'll learn how to use `NgOptimizedImage` to ensure your images are loaded efficiently.
<hr>
<docs-workflow>
<docs-step title="Import the NgOptimizedImage directive">
In order to leverage the `NgOptimizedImage` directive, first import it from the `@angular/common` library and add it to the component `imports` array.
```ts
import { NgOptimizedImage } from '@angular/common';
@Component({
standalone: true,
imports: [NgOptimizedImage],
...
})
```
</docs-step>
<docs-step title="Update the src attribute to be ngSrc">
To enable the `NgOptimizedImage` directive, swap out the `src` attribute for `ngSrc`. This applies for both static image sources (i.e., `src`) and dynamic image sources (i.e., `[src]`).
<docs-code language="angular-ts" highlight="[[9], [13]]">
import { NgOptimizedImage } from '@angular/common';
@Component({
standalone: true,
template: `
...
<li>
Static Image:
<img ngSrc="/assets/logo.svg" alt="Angular logo" width="32" height="32" />
</li>
<li>
Dynamic Image:
<img [ngSrc]="logoUrl" [alt]="logoAlt" width="32" height="32" />
</li>
...
`,
imports: [NgOptimizedImage],
})
</docs-code>
</docs-step>
<docs-step title="Add width and height attributes">
Note that in the above code example, each image has both `width` and `height` attributes. In order to prevent [layout shift](https://web.dev/articles/cls), the `NgOptimizedImage` directive requires both size attributes on each image.
In situations where you can't or don't want to specify a static `height` and `width` for images, you can use [the `fill` attribute](https://web.dev/articles/cls) to tell the image to act like a "background image", filling its containing element:
```angular-html
<div class="image-container"> //Container div has 'position: "relative"'
<img ngSrc="www.example.com/image.png" fill />
</div>
```
Note: For the `fill` image to render properly, its parent element must be styled with `position: "relative"`, `position: "fixed"`, or `position: "absolute"`.
</docs-step>
<docs-step title="Prioritize important images">
One of the most important optimizations for loading performance is to prioritize any image which might be the ["LCP element"](https://web.dev/articles/optimize-lcp), which is the largest on-screen graphical element when the page loads. To optimize your loading times, make sure to add the `priority` attribute to your "hero image" or any other images that you think could be an LCP element.
```ts
<img ngSrc="www.example.com/image.png" height="600" width="800" priority />
```
</docs-step>
<docs-step title="Optional: Use an image loader">
`NgOptimizedImage` allows you to specify an [image loader](guide/image-optimization#configuring-an-image-loader-for-ngoptimizedimage), which tells the directive how to format URLs for your images. Using a loader allows you to define your images with short, relative URLs:
```ts
providers: [
provideImgixLoader('https://my.base.url/'),
]
```
Final URL will be 'https://my.base.url/image.png'
```angular-html
<img ngSrc="image.png" height="600" width="800" />
```
Image loaders are for more than just convenience--they allow you to use the full capabilities of `NgOptimizedImage`. Learn more about these optimizations and the built-in loaders for popular CDNs [here](guide/image-optimization#configuring-an-image-loader-for-ngoptimizedimage).
</docs-step>
</docs-workflow>
By adding this directive to your workflow, your images are now loading using best practices with the help of Angular 🎉
If you would like to learn more, check out the [documentation for `NgOptimizedImage`](guide/image-optimization). Keep up the great work and let's learn about routing next.
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} |
angular/adev/src/content/tutorials/learn-angular/steps/11-optimizing-images/answer/src/app/app.component.ts_0_243 | import {Component} from '@angular/core';
import {UserComponent} from './user.component';
@Component({
selector: 'app-root',
template: `
<app-user />
`,
standalone: true,
imports: [UserComponent],
})
export class AppComponent {}
| {
"end_byte": 243,
"start_byte": 0,
"url": "https://github.com/angular/angular/blob/main/adev/src/content/tutorials/learn-angular/steps/11-optimizing-images/answer/src/app/app.component.ts"
} |
angular/adev/src/content/tutorials/learn-angular/steps/11-optimizing-images/answer/src/app/user.component.ts_0_653 | import {Component} from '@angular/core';
import {NgOptimizedImage} from '@angular/common';
@Component({
standalone: true,
selector: 'app-user',
template: `
<p>Username: {{ username }}</p>
<p>Preferred Framework:</p>
<ul>
<li>
Static Image:
<img ngSrc="/assets/logo.svg" alt="Angular logo" width="32" height="32" />
</li>
<li>
Dynamic Image:
<img [ngSrc]="logoUrl" [alt]="logoAlt" width="32" height="32" />
</li>
</ul>
`,
imports: [NgOptimizedImage],
})
export class UserComponent {
logoUrl = '/assets/logo.svg';
logoAlt = 'Angular logo';
username = 'youngTech';
}
| {
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"url": "https://github.com/angular/angular/blob/main/adev/src/content/tutorials/learn-angular/steps/11-optimizing-images/answer/src/app/user.component.ts"
} |
angular/adev/src/content/tutorials/learn-angular/steps/11-optimizing-images/answer/src/public/assets/logo.svg_0_2675 | <svg xmlns="http://www.w3.org/2000/svg" _ngcontent-ng-c3472466588="" width="32" height="32" viewBox="0 0 32 32" fill="none" class="adev-logo-symbol"><path _ngcontent-ng-c3472466588="" d="M22.0302 23.6181H9.54592L7.94976 27.494L15.7975 32L23.6453 27.494L22.0302 23.6181Z" fill="url(#paint0_linear_1602_15740)"/><path _ngcontent-ng-c3472466588="" d="M19.902 18.5776L15.7975 8.53461L11.6741 18.5776H19.902Z" fill="url(#paint1_linear_1602_15740)"/><path _ngcontent-ng-c3472466588="" d="M29.7449 22.4726L30.828 5.32697L19.3509 0L29.7449 22.4726Z" fill="url(#paint2_linear_1602_15740)"/><path _ngcontent-ng-c3472466588="" d="M12.2252 0L0.748047 5.32697L1.83115 22.4726L12.2252 0Z" fill="url(#paint3_linear_1602_15740)"/><defs _ngcontent-ng-c3472466588=""><linearGradient _ngcontent-ng-c3472466588="" id="paint0_linear_1602_15740" x1="-4.67856" y1="0.107889" x2="30.5691" y2="-0.175777" gradientUnits="userSpaceOnUse"><stop _ngcontent-ng-c3472466588="" offset="0.11416" stop-color="#FA2C04"/><stop _ngcontent-ng-c3472466588="" offset="0.348335" stop-color="#F11653"/><stop _ngcontent-ng-c3472466588="" offset="0.606888" stop-color="#F637E3"/><stop _ngcontent-ng-c3472466588="" offset="0.897436" stop-color="#8514F5"/></linearGradient><linearGradient _ngcontent-ng-c3472466588="" id="paint1_linear_1602_15740" x1="-4.67856" y1="0.107889" x2="30.5691" y2="-0.175777" gradientUnits="userSpaceOnUse"><stop _ngcontent-ng-c3472466588="" offset="0.11416" stop-color="#FA2C04"/><stop _ngcontent-ng-c3472466588="" offset="0.348335" stop-color="#F11653"/><stop _ngcontent-ng-c3472466588="" offset="0.606888" stop-color="#F637E3"/><stop _ngcontent-ng-c3472466588="" offset="0.897436" stop-color="#8514F5"/></linearGradient><linearGradient _ngcontent-ng-c3472466588="" id="paint2_linear_1602_15740" x1="-4.67856" y1="0.107889" x2="30.5691" y2="-0.175777" gradientUnits="userSpaceOnUse"><stop _ngcontent-ng-c3472466588="" offset="0.11416" stop-color="#FA2C04"/><stop _ngcontent-ng-c3472466588="" offset="0.348335" stop-color="#F11653"/><stop _ngcontent-ng-c3472466588="" offset="0.606888" stop-color="#F637E3"/><stop _ngcontent-ng-c3472466588="" offset="0.897436" stop-color="#8514F5"/></linearGradient><linearGradient _ngcontent-ng-c3472466588="" id="paint3_linear_1602_15740" x1="-4.67856" y1="0.107889" x2="30.5691" y2="-0.175777" gradientUnits="userSpaceOnUse"><stop _ngcontent-ng-c3472466588="" offset="0.11416" stop-color="#FA2C04"/><stop _ngcontent-ng-c3472466588="" offset="0.348335" stop-color="#F11653"/><stop _ngcontent-ng-c3472466588="" offset="0.606888" stop-color="#F637E3"/><stop _ngcontent-ng-c3472466588="" offset="0.897436" stop-color="#8514F5"/></linearGradient></defs></svg>
| {
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"start_byte": 0,
"url": "https://github.com/angular/angular/blob/main/adev/src/content/tutorials/learn-angular/steps/11-optimizing-images/answer/src/public/assets/logo.svg"
} |
angular/adev/src/content/tutorials/learn-angular/steps/11-optimizing-images/src/app/app.component.ts_0_243 | import {Component} from '@angular/core';
import {UserComponent} from './user.component';
@Component({
selector: 'app-root',
template: `
<app-user />
`,
standalone: true,
imports: [UserComponent],
})
export class AppComponent {}
| {
"end_byte": 243,
"start_byte": 0,
"url": "https://github.com/angular/angular/blob/main/adev/src/content/tutorials/learn-angular/steps/11-optimizing-images/src/app/app.component.ts"
} |
angular/adev/src/content/tutorials/learn-angular/steps/11-optimizing-images/src/app/user.component.ts_0_537 | import {Component} from '@angular/core';
@Component({
standalone: true,
selector: 'app-user',
template: `
<p>Username: {{ username }}</p>
<p>Preferred Framework:</p>
<ul>
<li>
Static Image:
<img src="/assets/logo.svg" alt="Angular logo" />
</li>
<li>
Dynamic Image:
<img [src]="logoUrl" [alt]="logoAlt" />
</li>
</ul>
`,
imports: [],
})
export class UserComponent {
logoUrl = '/assets/logo.svg';
logoAlt = 'Angular logo';
username = 'youngTech';
}
| {
"end_byte": 537,
"start_byte": 0,
"url": "https://github.com/angular/angular/blob/main/adev/src/content/tutorials/learn-angular/steps/11-optimizing-images/src/app/user.component.ts"
} |
angular/adev/src/content/tutorials/learn-angular/steps/11-optimizing-images/src/public/assets/logo.svg_0_2675 | <svg xmlns="http://www.w3.org/2000/svg" _ngcontent-ng-c3472466588="" width="32" height="32" viewBox="0 0 32 32" fill="none" class="adev-logo-symbol"><path _ngcontent-ng-c3472466588="" d="M22.0302 23.6181H9.54592L7.94976 27.494L15.7975 32L23.6453 27.494L22.0302 23.6181Z" fill="url(#paint0_linear_1602_15740)"/><path _ngcontent-ng-c3472466588="" d="M19.902 18.5776L15.7975 8.53461L11.6741 18.5776H19.902Z" fill="url(#paint1_linear_1602_15740)"/><path _ngcontent-ng-c3472466588="" d="M29.7449 22.4726L30.828 5.32697L19.3509 0L29.7449 22.4726Z" fill="url(#paint2_linear_1602_15740)"/><path _ngcontent-ng-c3472466588="" d="M12.2252 0L0.748047 5.32697L1.83115 22.4726L12.2252 0Z" fill="url(#paint3_linear_1602_15740)"/><defs _ngcontent-ng-c3472466588=""><linearGradient _ngcontent-ng-c3472466588="" id="paint0_linear_1602_15740" x1="-4.67856" y1="0.107889" x2="30.5691" y2="-0.175777" gradientUnits="userSpaceOnUse"><stop _ngcontent-ng-c3472466588="" offset="0.11416" stop-color="#FA2C04"/><stop _ngcontent-ng-c3472466588="" offset="0.348335" stop-color="#F11653"/><stop _ngcontent-ng-c3472466588="" offset="0.606888" stop-color="#F637E3"/><stop _ngcontent-ng-c3472466588="" offset="0.897436" stop-color="#8514F5"/></linearGradient><linearGradient _ngcontent-ng-c3472466588="" id="paint1_linear_1602_15740" x1="-4.67856" y1="0.107889" x2="30.5691" y2="-0.175777" gradientUnits="userSpaceOnUse"><stop _ngcontent-ng-c3472466588="" offset="0.11416" stop-color="#FA2C04"/><stop _ngcontent-ng-c3472466588="" offset="0.348335" stop-color="#F11653"/><stop _ngcontent-ng-c3472466588="" offset="0.606888" stop-color="#F637E3"/><stop _ngcontent-ng-c3472466588="" offset="0.897436" stop-color="#8514F5"/></linearGradient><linearGradient _ngcontent-ng-c3472466588="" id="paint2_linear_1602_15740" x1="-4.67856" y1="0.107889" x2="30.5691" y2="-0.175777" gradientUnits="userSpaceOnUse"><stop _ngcontent-ng-c3472466588="" offset="0.11416" stop-color="#FA2C04"/><stop _ngcontent-ng-c3472466588="" offset="0.348335" stop-color="#F11653"/><stop _ngcontent-ng-c3472466588="" offset="0.606888" stop-color="#F637E3"/><stop _ngcontent-ng-c3472466588="" offset="0.897436" stop-color="#8514F5"/></linearGradient><linearGradient _ngcontent-ng-c3472466588="" id="paint3_linear_1602_15740" x1="-4.67856" y1="0.107889" x2="30.5691" y2="-0.175777" gradientUnits="userSpaceOnUse"><stop _ngcontent-ng-c3472466588="" offset="0.11416" stop-color="#FA2C04"/><stop _ngcontent-ng-c3472466588="" offset="0.348335" stop-color="#F11653"/><stop _ngcontent-ng-c3472466588="" offset="0.606888" stop-color="#F637E3"/><stop _ngcontent-ng-c3472466588="" offset="0.897436" stop-color="#8514F5"/></linearGradient></defs></svg>
| {
"end_byte": 2675,
"start_byte": 0,
"url": "https://github.com/angular/angular/blob/main/adev/src/content/tutorials/learn-angular/steps/11-optimizing-images/src/public/assets/logo.svg"
} |
angular/adev/src/content/tutorials/learn-angular/steps/7-event-handling/README.md_0_1481 | # Event handling
Event handling enables interactive features on web apps. It gives you the ability as a developer to respond to user actions like button presses, form submissions and more.
In this activity, you'll learn how to add an event handler.
<hr />
In Angular you bind to events with the parentheses syntax `()`. On a given element, wrap the event you want to bind to with parentheses and set an event handler. Consider this `button` example:
```angular-ts
@Component({
...
template: `<button (click)="greet()">`
})
class AppComponent {
greet() {
console.log('Hello, there 👋');
}
}
```
In this example, the `greet()` function will run every time the button is clicked. Take note that the `greet()` syntax includes the trailing parenthesis.
Alright, your turn to give this a try:
<docs-workflow>
<docs-step title="Add an event handler">
Add the `onMouseOver` event handler function in the `AppComponent` class. Use the following code as the implementation:
```ts
onMouseOver() {
this.message = 'Way to go 🚀';
}
```
</docs-step>
<docs-step title="Bind to the template event">
Update the template code in `app.component.ts` to bind to the `mouseover` event of the `section` element.
```angular-html
<section (mouseover)="onMouseOver()">
```
</docs-step>
</docs-workflow>
And with a few steps in the code you've created your first event handler in Angular. Seems like you are getting pretty good at this, keep up the good work.
| {
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"start_byte": 0,
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} |
angular/adev/src/content/tutorials/learn-angular/steps/7-event-handling/answer/src/app/app.component.ts_0_361 | import {Component} from '@angular/core';
@Component({
selector: 'app-root',
template: `
<section (mouseover)="onMouseOver()">
There's a secret message for you, hover to reveal:
{{ message }}
</section>
`,
standalone: true,
})
export class AppComponent {
message = '';
onMouseOver() {
this.message = 'Way to go 🚀';
}
}
| {
"end_byte": 361,
"start_byte": 0,
"url": "https://github.com/angular/angular/blob/main/adev/src/content/tutorials/learn-angular/steps/7-event-handling/answer/src/app/app.component.ts"
} |
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