67 lines
1.7 KiB
Markdown
67 lines
1.7 KiB
Markdown
# Step 4: Connect to an API
|
||
|
||
## Video of this Lesson
|
||
|
||
<iframe width="560" height="600" src="https://www.youtube.com/embed/digMpZzPtg8" frameborder="0" allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>
|
||
|
||
Real-world applications do not live in isolation — they need APIs to talk to. Setup your app to talk to an API.
|
||
|
||
**Open `apps/todos/src/app/app.module.ts` to import `HttpClientModule`.**
|
||
|
||
```typescript
|
||
import { BrowserModule } from '@angular/platform-browser';
|
||
import { NgModule } from '@angular/core';
|
||
|
||
import { AppComponent } from './app.component';
|
||
import { HttpClientModule } from '@angular/common/http';
|
||
|
||
@NgModule({
|
||
declarations: [AppComponent],
|
||
imports: [BrowserModule, HttpClientModule],
|
||
providers: [],
|
||
bootstrap: [AppComponent],
|
||
})
|
||
export class AppModule {}
|
||
```
|
||
|
||
**Now, use `HttpClient` in the component to get the data from the api.**
|
||
|
||
```typescript
|
||
import { Component } from '@angular/core';
|
||
import { HttpClient } from '@angular/common/http';
|
||
|
||
interface Todo {
|
||
title: string;
|
||
}
|
||
|
||
@Component({
|
||
selector: 'myorg-root',
|
||
templateUrl: './app.component.html',
|
||
styleUrls: ['./app.component.css'],
|
||
})
|
||
export class AppComponent {
|
||
todos: Todo[] = [];
|
||
|
||
constructor(private http: HttpClient) {
|
||
this.fetch();
|
||
}
|
||
|
||
fetch() {
|
||
this.http.get<Todo[]>('/api/todos').subscribe((t) => (this.todos = t));
|
||
}
|
||
|
||
addTodo() {
|
||
this.http.post('/api/addTodo', {}).subscribe(() => {
|
||
this.fetch();
|
||
});
|
||
}
|
||
}
|
||
```
|
||
|
||
!!!!!
|
||
Run `npx nx serve todos` and open http://localhost:4200. What do you see?
|
||
!!!!!
|
||
"the server responded with a status of 404 (Not Found)" in Console.
|
||
Blank screen.
|
||
Exception rendered on the screen.
|