Angular 14 File upload example with progress bar & Bootstrap

In this tutorial, I will show you way to build an Angular 14 File upload to Rest API example using Bootstrap, HttpClient, FormData and Progress Bar.

More Practice:
– Angular Image Upload with Preview example
– Angular example: CRUD Application with Rest API
– Angular Form Validation example (Reactive Forms)
– Using Material: Angular Material File upload example
– Angular Login and Registration example with Web Api

Serverless with Firebase:
Angular 14 File Upload with Firebase Storage

Contents

Overview
Technology
Rest API for File Upload & Storage
Setup Angular 14 Project
Angular 14 File Upload example Project
Set up App Module for HttpClient
Add Bootstrap to the project
Create Angular 14 Service for Upload Files
Create Component for Upload Files
Add Upload File Component to App Component
Run the App
Further Reading
Conclusion
Source Code

Overview

We’re gonna create an Angular 14 File upload to Rest API application in that user can:

see the upload process (percentage)
view all uploaded files
download by clicking on the file name

Technology

Angular 14
RxJS 7
Bootstrap 4

Rest API for File Upload & Storage

Here is the API that our Angular App will work with:

Methods	Urls	Actions
POST	/upload	upload a File
GET	/files	get List of Files (name & url)
GET	/files/[filename]	download a File

You can find how to implement the Rest APIs Server at one of following posts:
– Node.js Express File Upload Rest API example
– Node.js Express File Upload to MongoDB example
– Node.js Express File Upload to Google Cloud Storage example
– Spring Boot Multipart File upload (to static folder) example

Or: Spring Boot Multipart File upload (to database) example

Setup Angular 14 Project

Let’s open cmd and use Angular CLI to create a new Angular 14 Project as following command:

ng new angular-14-file-upload
? Would you like to add Angular routing? No
? Which stylesheet format would you like to use? CSS

We also need to generate some Components and Services:

ng g s services/file-upload
ng g c components/file-upload

Now you can see that our project directory structure looks like this.

Angular 14 File Upload example Project

Let me explain it briefly.

– We import necessary library, components in app.module.ts.
– file-upload.service provides methods to save File and get Files from Rest API Server using HttpClient.
– file-upload.component contains upload form, progress bar, display of list files.
– app.component is the container that we embed all components.
– style.css for importing the Bootstrap library.

Set up App Module for HttpClient

Open app.module.ts and import HttpClientModule:

import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { HttpClientModule } from '@angular/common/http';

import { AppComponent } from './app.component';
import { FileUploadComponent } from './components/file-upload/file-upload.component';

@NgModule({
  declarations: [
    AppComponent,
    FileUploadComponent
  ],
  imports: [
    BrowserModule,
    HttpClientModule
  ],
  providers: [],
  bootstrap: [AppComponent]
})
export class AppModule { }

Add Bootstrap to the project

Run the command: npm install [email protected].

Next, open src/style.css and add following code:

@import "~bootstrap/dist/css/bootstrap.css";

Create Angular 14 Service for Upload Files

This service will use Angular HttpClient to send HTTP requests.
There are 2 functions:

upload(file): returns Observable<HttpEvent<any>> that we’re gonna use for tracking progress
getFiles(): returns a list of Files’ information as Observable object

services/file-upload.service.ts

import { Injectable } from '@angular/core';
import { HttpClient, HttpRequest, HttpEvent } from '@angular/common/http';
import { Observable } from 'rxjs';

@Injectable({
  providedIn: 'root'
})
export class FileUploadService {
  private baseUrl = 'http://localhost:8080';

  constructor(private http: HttpClient) { }

  upload(file: File): Observable<HttpEvent<any>> {
    const formData: FormData = new FormData();

    formData.append('file', file);

    const req = new HttpRequest('POST', `${this.baseUrl}/upload`, formData, {
      reportProgress: true,
      responseType: 'json'
    });

    return this.http.request(req);
  }

  getFiles(): Observable<any> {
    return this.http.get(`${this.baseUrl}/files`);
  }
}

– FormData is a data structure that can be used to store key-value pairs. We use it to build an object which corresponds to an HTML form with append() method.

– We set reportProgress: true to exposes progress events. Notice that this progress event are expensive (change detection for each event), so you should only use when you want to monitor it.

– We call the request(PostRequest) & get() method of HttpClient to send an HTTP POST & Get request to the File Upload Rest API server.

Create Component for Upload Files

Let’s create a File Upload UI with Progress Bar, Card, Button and Message.

First we need to use the following imports:

file-upload.component.ts

import { Component, OnInit } from '@angular/core';
import { HttpEventType, HttpResponse } from '@angular/common/http';
import { Observable } from 'rxjs';
import { FileUploadService } from 'src/app/services/file-upload.service';

Then we define the some variables and inject FileUploadService as follows:

export class FileUploadComponent implements OnInit {

  selectedFiles?: FileList;
  currentFile?: File;
  progress = 0;
  message = '';

  fileInfos?: Observable<any>;

  constructor(private uploadService: FileUploadService) { }

}

Next we define selectFile() method. It helps us to get the selected Files.

selectFile(event: any): void {
  this.selectedFiles = event.target.files;
}

Next we write upload() method for upload file:

export class FileUploadComponent implements OnInit {
  selectedFiles?: FileList;
  currentFile?: File;
  progress = 0;
  message = '';

  fileInfos?: Observable<any>;

  constructor(private uploadService: FileUploadService) { }

  selectFile(event: any): void {
    this.selectedFiles = event.target.files;
  }

  upload(): void {
    this.progress = 0;

    if (this.selectedFiles) {
      const file: File | null = this.selectedFiles.item(0);

      if (file) {
        this.currentFile = file;

        this.uploadService.upload(this.currentFile).subscribe({
          next: (event: any) => {
            if (event.type === HttpEventType.UploadProgress) {
              this.progress = Math.round(100 * event.loaded / event.total);
            } else if (event instanceof HttpResponse) {
              this.message = event.body.message;
              this.fileInfos = this.uploadService.getFiles();
            }
          },
          error: (err: any) => {
            console.log(err);
            this.progress = 0;

            if (err.error && err.error.message) {
              this.message = err.error.message;
            } else {
              this.message = 'Could not upload the file!';
            }

            this.currentFile = undefined;
          }
        });
      }

      this.selectedFiles = undefined;
    }
  }

}

We use selectedFiles for accessing current File as the first Item. Then we call uploadService.upload() method on the currentFile.

The progress will be calculated basing on event.loaded and event.total.
If the transmission is done, the event will be a HttpResponse object. At this time, we call uploadService.getFiles() to get the files’ information and assign the result to fileInfos variable.

We also need to do this work in ngOnInit() method:

ngOnInit(): void {
  this.fileInfos = this.uploadService.getFiles();
}

Now we create the HTML template of the Upload File UI. Add the following content to file-upload.component.html file:

<div class="row">
  <div class="col-8">
    <label class="btn btn-default p-0">
      <input type="file" (change)="selectFile($event)" />
    </label>
  </div>

  <div class="col-4">
    <button class="btn btn-success btn-sm" [disabled]="!selectedFiles" (click)="upload()">
      Upload
    </button>
  </div>
</div>

<div *ngIf="currentFile" class="progress my-3">
  <div
    class="progress-bar progress-bar-info progress-bar-striped"
    role="progressbar"
    attr.aria-valuenow="{{ progress }}"
    aria-valuemin="0"
    aria-valuemax="100"
    [ngStyle]="{ width: progress + '%' }"
  >
    {{ progress }}%
  </div>
</div>

<div *ngIf="message" class="alert alert-secondary" role="alert">{{ message }}</div>

<div class="card mt-3">
  <div class="card-header">List of Files</div>
  <ul class="list-group list-group-flush">
    <li *ngFor="let file of fileInfos | async" class="list-group-item">
      <a href="{{ file.url }}">{{ file.name }}</a>
    </li>
  </ul>
</div>

Add Upload File Component to App Component

Open app.component.html and embed the FileUpload Component with <app-file-upload> tag.

<div class="container" style="width:600px">
  <div class="my-3">
    <h3>bezkoder.com</h3>
    <h4>{{ title }}</h4>
  </div>

  <app-file-upload></app-file-upload>
</div>

app.component.ts

import { Component } from '@angular/core';

@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.css']
})
export class AppComponent {
  title = 'Angular 14 File Upload example';
}

Run the App

Because we configure CORS for origin: http://localhost:8081, so you need to run Angular 14 File Upload Client with command:
ng serve --port 8081

Open Browser with url http://localhost:8081/ and check the result.

Conclusion

Today we’re learned how to build an example for File upload to Rest API with Progress Bar using Angular 14 and FormData. We also provide the ability to show list of files, upload progress using Bootstrap, and to download file from the server.

If you want to upload multiple files at once like this: