Angular 13 Image Upload with Preview Tutorial

Hello,

Now, let's see example of angular 13 image upload with reactive forms. you'll learn angular 13 image upload with preview example. We will look at example of image upload in angular 13. This tutorial will give you simple example of image upload in angular 13 with web api. Follow bellow tutorial step of how to image upload in angular 13.

Here, we will simple create reactive form using formGroup. input file onchange event we will add image to another formgroup element. then after click on submit button we will call web api for store that image to server.

I written step by step image uploading with angular 13 application, also created web services using php. so let's follow bellowing step and get preview like as bellow:

Preview:

Step 1: Create New App

You can easily create your angular app using bellow 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 bellow:

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 updated our html file. we will create simple reactive form with input file element and image tag for preview.

In this file i used bootstrap 4 class, if you want to use bootstrap then you can follow this link: Install Bootstrap 5 in Angular 13

so let's put bellow code:

src/app/app.component.html

<h1>Angular 13 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 4: Use Component ts File

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/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 {
  
   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
        });
   
      };
   
    }
  }
  
  /**
   * 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);
      
    $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.

I hope it can help you...