Send File to API in Angular 17

Sending files to an API using Angular involves creating an HTML form to select the file, handling the file selection event, constructing a multipart form data object, and making an HTTP POST request to the API. Here's a step-by-step guide:

1. Create an HTML form: In your Angular component's HTML template, create an <input type="file"> element to allow users to select a file. Use the (change) event binding to handle the file selection.

<input type="file" (change)="onFileSelected($event)">

1. Handle the file selection event: In your component's TypeScript code, define a method onFileSelected that receives the file selection event. This method will extract the selected file information and prepare it for upload.

onFileSelected(event: Event) {
  const selectedFile = event.target['files'][0];
  // Process the selected file
}

1. Construct multipart form data: Create a new FormData object to represent the multipart form data. This object will hold the file data along with any other form data you might need to send.

const formData = new FormData();
formData.append('file', selectedFile, selectedFile.name);
// Add other form data if needed

1. Make an HTTP POST request: Use Angular's HttpClient service to make an HTTP POST request to the API endpoint. Include the FormData object as the request body.

this.http.post<any>(apiUrl, formData, { headers: { 'Content-Type': 'multipart/form-data' } })
  .subscribe(response => {
    // Handle successful response
  }, error => {
    // Handle error response
  });

1. Handle the response: In the subscribe callback, handle the response from the API. If the response is successful, you can proceed with the uploaded file or perform any necessary actions. If there's an error, handle it appropriately.

• Author: Ahmed Bouchefra Follow @ahmedbouchefra

• Date: 17 Nov 2023