Angular 2 How To Call A Function After Get A Response From Subscribe Http Post

When working with Angular 2 and dealing with HTTP requests, it's common to want to call a function after receiving a response from an HTTP POST request. This article will guide you through the steps to achieve this in your Angular 2 code.

Firstly, let's set up the HTTP POST request using Angular's HttpClient module. Make sure you have imported the necessary modules at the top of your component file:

import { HttpClient } from '@angular/common/http';

Next, inject the `HttpClient` service into your component's constructor:

constructor(private http: HttpClient) { }

Now, let's make the HTTP POST request and subscribe to the response:

this.http.post('YOUR_API_ENDPOINT', data).subscribe(
  (response) => {
    // Call your function here once you receive the response
    this.yourFunction();
  },
  (error) => {
    console.error('Error occurred:', error);
  }
);

In the above code snippet, replace `'YOUR_API_ENDPOINT'` with the actual endpoint you are making a POST request to. `data` represents the payload you want to send with the POST request. The `subscribe` method takes two arguments: a success callback function and an error callback function.

Within the success callback function `(response) => { }`, you can call your desired function after receiving a response from the POST request. In this case, we are calling `this.yourFunction();`. Remember to replace `yourFunction()` with the actual function you want to call.

On the other hand, the error callback function `(error) => { }` will handle any errors that occur during the HTTP POST request. You can customize error handling based on your requirements.

It's crucial to define the function `yourFunction()` within the same component class where you are making the HTTP POST request. This ensures that the function is accessible within the scope of the component.

Ensure that the function you are calling after receiving the response is defined correctly and does not rely on asynchronous data. In case your function depends on data from the HTTP response, consider passing that data as a parameter to the function.

By following these steps, you can effectively call a function after getting a response from an HTTP POST request in Angular 2. This approach allows you to perform additional tasks or update the UI based on the response received from the server.

Experiment with different functionalities and adapt this technique to suit your specific requirements when working with Angular 2 and handling HTTP requests.