Connecting Angular and the WordPress API with wp-api-angular

This tutorial demonstrates using the wp-api-angular library to connect Angular 2 applications with the WordPress REST API. The library supports major WP resources (users, posts, comments, media, taxonomies). We'll build features showcasing its ease of use: JWT authentication, user and post listing, and post CRUD (Create, Read, Update, Delete) operations. The complete source code is on GitHub. While this tutorial uses Angular 5, the concepts apply to Angular 2 .

Key Concepts:

• Seamless Angular 2 and WordPress REST API integration using wp-api-angular.
• WordPress setup: enabling permalinks and installing the JWT Authentication plugin for secure API access.
• Angular implementation: JWT authentication, user listing, and post CRUD operations.
• Asynchronous API handling with Observables and Promises in Angular.
• Accessing the full WordPress API (users, posts, comments, media) to enhance Angular applications.

Setting Up:

This tutorial uses a self-hosted WordPress instance. Enable permalinks (see the WordPress Codex for instructions; for Nginx, add try_files $uri $uri/ /index.php?$args; to nginx.conf). Install the JWT Authentication plugin for secure API access.

Angular Application Setup:

1. Create a new Angular application: ng new wp-api
2. Install the library: cd wp-api && npm install wp-api-angular --save
3. Import necessary modules in src/app/app.module.ts:

<code class="language-typescript">import { Http } from '@angular/http';
import { HttpClientModule, HttpClient } from '@angular/common/http';
import { WpApiModule, WpApiLoader, WpApiStaticLoader } from 'wp-api-angular';

@NgModule({
  // ...
  imports: [
    BrowserModule,
    FormsModule,
    HttpClientModule,
    WpApiModule.forRoot({
      provide: WpApiLoader,
      useFactory: WpApiLoaderFactory,
      deps: [Http]
    })
  ],
  // ...
})

export function WpApiLoaderFactory(http: Http) {
  return new WpApiStaticLoader(http, 'http://YOUR_DOMAIN_HERE/wp-json/wp/v2/', '');
}</code>

Replace YOUR_DOMAIN_HERE with your WordPress domain. Also, add necessary imports to app.component.ts (including NgForm, HttpClientModule, Headers).

Authentication (JWT):

1. Add a token variable to app.component.ts.
2. Create an authentication component (ng generate component authentication).
3. In authentication.component.ts, create a user object and an auth() method:

<code class="language-typescript">auth() {
  this.http.post('http://YOUR_DOMAIN/wp-json/jwt-auth/v1/token', {
    username: this.user.login,
    password: this.user.password
  }).subscribe(data => {
    if (data['token']) {
      this.token = data['token'];
      this.tokenChange.emit(this.token);
    }
  });
}</code>

4. Create a login form in authentication.component.html.

Listing Users:

1. Create a user-list component (ng generate component user-list).
2. In user-list.component.ts, inject WpApiUsers and use getList() to fetch users.

Working with Posts (CRUD):

• Creating Posts: Create a post-new component. Use WpApiPosts.create() with JWT authorization headers.
• Listing Posts: Create a post-list component. Use WpApiPosts.getList() to fetch posts.
• Deleting Posts: Add a delete button to post-list. Use WpApiPosts.delete() with JWT authorization headers.
• Editing Posts: Create a post-edit component. Use WpApiPosts.update() with JWT authorization headers.

Conclusion:

This tutorial provides a foundation for integrating Angular with the WordPress REST API. The wp-api-angular library simplifies this process, allowing for efficient management of WordPress content within your Angular applications. Remember to handle authentication securely and manage asynchronous operations effectively. The provided code snippets and explanations should help you build more complex interactions with the WordPress API.

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