Angular 16 Multiple Image Upload with Preview Example

Hey Developer,

I am going to explain to you example of angular 16 multiple image upload with preview. you will learn angular 16 multiple image upload with reactive forms. We will use multiple image upload in angular 16. This article will give you a simple example of how to upload multiple images in angular 16.

I will give you a very simple example from scratch for uploading multiple images with reactive form in the angular 16 application.

Here, we will simply create a reactive form using formGroup. input file onchange event we will add images to another formgroup element. then after clicking on submit button, we will call web API to store that image on the server.

I have written step-by-step image uploading with the angular 16 application and also created web services using PHP. so let's follow the bellowing step and get a preview like as below:

Preview:

Step 1: Create New App

You can easily create your angular app using below command:

ng new my-new-app

Step 2: Import Module

In this step, we need to import HttpClientModule, FormsModule and ReactiveFormsModule to app.module.ts file. so let's import it as like below:

src/app/app.module.ts

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

Step 3: Updated View File

Now here, we will update our HTML file. we will create a simple reactive form with an input file element and image tag for preview.

In this file I used the bootstrap 5 class, if you want to use bootstrap then you can follow this link: Install Bootstrap 5 in Angular 16

so let's put bellow code:

src/app/app.component.html

<h1>Angular 16 Multiple Image Upload with Preview - ItSolutionStuff.com</h1>
    
<form [formGroup]="myForm" (ngSubmit)="submit()">
           
    <div class="form-group">
        <label for="name">Name</label>
        <input 
            formControlName="name"
            id="name" 
            type="text" 
            class="form-control">
        <div *ngIf="f['name'].touched && f['name'].invalid" class="alert alert-danger">
            <div *ngIf="f['name'].errors && f['name'].errors['required']">Name is required.</div>
            <div *ngIf="f['name'].errors && f['name'].errors['minlength']">Name should be 3 character.</div>
        </div>
    </div>
     
    <div class="form-group">
        <label for="file">File</label>
        <input 
            formControlName="file"
            id="file" 
            type="file" 
            class="form-control"
            multiple="" 
            (change)="onFileChange($event)">
        <div *ngIf="f['file'].touched && f['file'].invalid" class="alert alert-danger">
            <div *ngIf="f['file'].errors && f['file'].errors['required']">File is required.</div>
        </div>
    </div>
     
    <img *ngFor='let url of images'  [src]="url" height="150" width="200px" style="margin: 3px;"> <br/>
         
    <button class="btn btn-primary" [disabled]="myForm.invalid" type="submit">Submit</button>
</form>

Step 4: Use Component ts File

Now we need to update our component.ts file with formGroup and formControl elements.

i used my local api file url 'http://localhost:8001/upload.php', you can use your api there.

so, let's update as like below:

src/app/app.component.ts

import { Component } from '@angular/core';
import { HttpClient } from '@angular/common/http';
import { FormGroup, FormControl, Validators} from '@angular/forms';
    
@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.css']
})
export class AppComponent {
   images : any = [];
  
  /*------------------------------------------
  --------------------------------------------
  Declare Form
  --------------------------------------------
  --------------------------------------------*/
  myForm = new FormGroup({
    name: new FormControl('', [Validators.required, Validators.minLength(3)]),
    file: new FormControl('', [Validators.required]),
    fileSource: new FormControl('', [Validators.required])
  });
    
  /*------------------------------------------
  --------------------------------------------
  Created constructor
  --------------------------------------------
  --------------------------------------------*/
  constructor(private http: HttpClient) { }
    
  /**
   * Write code on Method
   *
   * @return response()
   */
  get f(){
    return this.myForm.controls;
  }
    
  /**
   * Write code on Method
   *
   * @return response()
   */
  onFileChange(event:any) {
    if (event.target.files && event.target.files[0]) {
        var filesAmount = event.target.files.length;
        for (let i = 0; i < filesAmount; i++) {
                var reader = new FileReader();
     
                reader.onload = (event:any) => {
                  console.log(event.target.result);
                   this.images.push(event.target.result); 
   
                   this.myForm.patchValue({
                      fileSource: this.images
                   });
                }
    
                reader.readAsDataURL(event.target.files[i]);
        }
    }
  }
    
  /**
   * Write code on Method
   *
   * @return response()
   */
  submit(){
    console.log(this.myForm.value);
    this.http.post('http://localhost:8001/upload.php', this.myForm.value)
      .subscribe(res => {
        console.log(res);
        alert('Uploaded Successfully.');
      })
  }
}

Now we are ready to run our example, we will create api file using php. so you can create update.php file with "upload" folder and run with different port and call it. so let's create upload.php file as like bellow:

upload.php

<?php
  
header("Access-Control-Allow-Origin: *");
header("Access-Control-Allow-Methods: PUT, GET, POST");
header("Access-Control-Allow-Headers: Origin, X-Requested-With, Content-Type, Accept");
   
$folderPath = "upload/";
$postdata = file_get_contents("php://input");
$request = json_decode($postdata);
   
foreach ($request->fileSource as $key => $value) {
   
    $image_parts = explode(";base64,", $value);
   
    $image_type_aux = explode("image/", $image_parts[0]);
   
    $image_type = $image_type_aux[1];
  
    $image_base64 = base64_decode($image_parts[1]);
  
    $file = $folderPath . uniqid() . '.'.$image_type;
  
    file_put_contents($file, $image_base64);
}

Run PHP & Angular App:

All the required steps have been done, now you have to type the given below command and hit enter to run the Angular app:

Run Angular App:

ng serve

Run PHP API:

php -S localhost:8001

Now, Go to your web browser, type the given URL and view the app output:

http://localhost:4200

Now you can run and check it.

I hope it can help you...