How to Read Text File Content in Angular 4 with HTTPClient - Easy Tutorial

If you're working with Angular 4 and need to read the content of a text file, the good news is that it's relatively easy to do with the HTTPClient module. Here's a quick tutorial on how to do it.

First, make sure you have the HTTPClient module imported into your project. You can do this by adding the following line to your app.module.ts file:

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

Next, create a service file to handle the file reading. In this example, we'll call the service "FileService".

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

@Injectable({
  providedIn: 'root'
})
export class FileService {

  constructor(private http: HttpClient) { }

  getTextFileContent(filePath: string) {
    return this.http.get(filePath, { responseType: 'text' });
  }
}

In this service, we're using the HttpClient to make a GET request for the text file content. We're also specifying that the response type should be 'text'.

Now, in your component, you can inject the FileService and call the getTextFileContent method to retrieve the content of the file. Here's an example:

import { Component } from '@angular/core';
import { FileService } from './file.service';

@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.css']
})
export class AppComponent {
  fileContent: string;

  constructor(private fileService: FileService) { }

  ngOnInit() {
    this.fileService.getTextFileContent('assets/sample.txt')
      .subscribe(data => this.fileContent = data);
  }
}

In this component, we're injecting the FileService and calling the getTextFileContent method to retrieve the content of the file. We're also subscribing to the returned data and setting the fileContent property to the result.

And that's it! With these few steps, you can easily read the content of a text file in Angular 4 using the HTTPClient.