Angular 18 Image Upload with Preview Example

In this post, i will show you how to image upload with preview using API in angular 18 application.

Here, we will simply create a reactive form using a form group. input file onchange event we will add an image to another form group 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 18 application and also created web services using PHP.

Step for Image Upload in Angular 18 Application

• Step 1: Create Angular 18 Project
• Step 2: Create Image Upload Component
• Step 3: Import Component
• Step 4: Use New Component
• Step 5: Create API Endpoint
• Run Angular App

so let's follow the bellowing steps and get a preview as below:

Step 1: Create Angular 18 Project

You can easily create your angular app using below command:

ng new my-new-app

Step 2: Create Image Upload Component

Here, we need to create new image upload component using following command:

ng g c ImageUpload

Now, we need to update component ts file and HTML file as following way.

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

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

so, let's update as like bellow:

src/app/image-upload/image-upload.component.ts

import { Component } from '@angular/core';
import { CommonModule } from '@angular/common';
  
import { FormsModule, ReactiveFormsModule } from '@angular/forms';
import { FormGroup, FormControl, Validators } from '@angular/forms';
  
import { HttpClientModule, HttpClient } from '@angular/common/http';
  
@Component({
  selector: 'app-image-upload',
  standalone: true,
  imports: [CommonModule, FormsModule, ReactiveFormsModule, HttpClientModule],
  templateUrl: './image-upload.component.html',
  styleUrl: './image-upload.component.css'
})
export class ImageUploadComponent {
  
  imageSrc: string = '';
    
  /*------------------------------------------
  --------------------------------------------
  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) {
    const reader = new FileReader();
      
    if(event.target.files & event.target.files.length) {
      const [file] = event.target.files;
      reader.readAsDataURL(file);
      
      reader.onload = () => {
     
        this.imageSrc = reader.result as string;
       
        this.myForm.patchValue({
          fileSource: reader.result as string
        });
     
      };
   
    }
  }
    
  /**
   * 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 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 bootstrap 5 class, if you want to use bootstrap then you can follow this link: Install Bootstrap 5 in Angular 18

so let's put bellow code:

src/app/image-upload/image-upload.component.html

<h1>Angular 18 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"
            (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 [src]="imageSrc" *ngIf="imageSrc" style="height: 300px; width:500px">
          
    <button class="btn btn-primary" [disabled]="myForm.invalid" type="submit">Submit</button>
</form>

Step 3: Import Component

In this step, we need to import ImageUploadComponent to app.component.ts file. so let's import it as like below:

src/app/app.component.ts

import { Component } from '@angular/core';
import { CommonModule } from '@angular/common';
import { RouterOutlet } from '@angular/router';
  
import { ImageUploadComponent } from './image-upload/image-upload.component';
  
@Component({
  selector: 'app-root',
  standalone: true,
  imports: [CommonModule, RouterOutlet, ImageUploadComponent],
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.css']
})
export class AppComponent {
  title = 'image-app';
}

Step 4: Use New Component

now, we will use new component on following html file.

src/app/app.component.html

<app-image-upload></app-image-upload>

Step 5: Create API Endpoint

Now we are ready to run our example, we will create an 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 an 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);
      
    $image_parts = explode(";base64,", $request->fileSource);
      
    $image_type_aux = explode("image/", $image_parts[0]);
      
    $image_type = $image_type_aux[1];
      
    $image_base64 = base64_decode($image_parts[1]);
      
    $file = $folderPath . uniqid() . '.png';
      
    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.

Output:

I hope it can help you...