Angular File Upload

Last Updated : 09 Jan, 2025

The file upload is an essential component to make a form that store some image kind of data. It helps in applications using image upload or in the file sharing. This file-upload component uses file.io API for uploading file and in return it provides a shareable link. Furthermore, we can send get request to shareable link to get the file but for now, our only focus is on upload section so we only use the post method.

Approach:

Create a new angular app using following command-
```
ng new angular-file-upload 
```
Move inside the app by using cd command-
```
cd src/app/
```
Generate new component file-upload-
```
ng g c file-upload/ 
```
Open src/app folder and start editing app.component.html file.
html
<app-file-upload></app-file-upload>
Create a service for file-upload component via command-
```
ng g s file-upload/
```

Open src/app/file-upload folder and start editing file-upload.component.ts file.

javascript

import { Component, OnInit } from '@angular/core'; import { FileUploadService } from './file-upload.service';  @Component({     selector: 'app-file-upload',     templateUrl: './file-upload.component.html',     styleUrls: ['./file-upload.component.css'] }) export class FileUploadComponent implements OnInit {      // Variable to store shortLink from api response     shortLink: string = "";     loading: boolean = false; // Flag variable     file: File = null; // Variable to store file      // Inject service      constructor(private fileUploadService: FileUploadService) { }      ngOnInit(): void {     }      // On file Select     onChange(event) {         this.file = event.target.files[0];     }      // OnClick of button Upload     onUpload() {         this.loading = !this.loading;         console.log(this.file);         this.fileUploadService.upload(this.file).subscribe(             (event: any) => {                 if (typeof (event) === 'object') {                      // Short link via api response                     this.shortLink = event.link;                      this.loading = false; // Flag variable                  }             }         );     } }

Open src/app/file-upload/ and start editing file-upload.service.ts file.

javascript

import { Injectable } from '@angular/core'; import {HttpClient} from '@angular/common/http'; import {Observable} from 'rxjs'; @Injectable({   providedIn: 'root' }) export class FileUploadService {      // API url   baseApiUrl = "https://file.io"      constructor(private http:HttpClient) { }    // Returns an observable   upload(file):Observable<any> {        // Create form data       const formData = new FormData();               // Store form name as "file" with file data       formData.append("file", file, file.name);              // Make http post request over api       // with formData as req       return this.http.post(this.baseApiUrl, formData)   } }

Open src/app/file-upload and start editing file-upload.component.html file.

html

<div class="text-center">     <input class="form-control" type="file"              (change)="onChange($event)">      <button (click)="onUpload()"          class="btn btn-success">         Upload     </button> </div>  <!-- Shareable short link of  uploaded file --> <div class="container text-center jumbotron"     *ngIf="shortLink">     <h2> Visit Here</h2>     <a href="{{shortLink}}">{{shortLink}}</a> </div>  <!--Flag variable is used here--> <div class="container" *ngIf="loading">     <h3>Loading ...</h3> </div>

Open src/app/ and start editing app.module.ts file.

javascript

import { BrowserModule } from      '@angular/platform-browser'; import { NgModule } from '@angular/core';  import { FileUploadComponent } from      './file-upload/file-upload.component';  import { AppComponent } from './app.component'; import {HttpClientModule} from      '@angular/common/http'; @NgModule({   declarations: [     AppComponent,     FileUploadComponent,   ],   imports: [     BrowserModule,     HttpClientModule   ],   providers: [],   bootstrap: [AppComponent] }) export class AppModule { }

Now run this command to serve on localhost
```
ng serve
```
Output:
- Before file selection:
- After file selection and clicking on button:
- After loading is completed:
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