Angular 12 Multiple Image Upload with Preview Example
Hi,
Now, let's see post of angular 12 multiple image upload with preview. you can see angular 12 multiple image upload example. This post will give you simple example of multiple image upload in angular 12. This article goes in detailed on how to upload multiple images in angular 12. Follow bellow tutorial step of angular 12 multiple image upload preview.
i will give you very simple example from scratch for upload multiple images with reactive form in angular 12 application.
Here, we will simple create reactive form using formGroup. input file onchange event we will add images 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 12 application, also created web services using php. so let's follow bellowing step and get preview like as bellow:
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 { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';
import { HttpClientModule } from '@angular/common/http';
import { FormsModule, ReactiveFormsModule } from '@angular/forms';
import { AppComponent } from './app.component';
@NgModule({
declarations: [
AppComponent
],
imports: [
BrowserModule,
HttpClientModule,
FormsModule,
ReactiveFormsModule
],
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 12
so let's put bellow code:
src/app/app.component.html
<h1>Angular 12 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" 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 {
images : string[] = [];
myForm = new FormGroup({
name: new FormControl('', [Validators.required, Validators.minLength(3)]),
file: new FormControl('', [Validators.required]),
fileSource: new FormControl('', [Validators.required])
});
constructor(private http: HttpClient) { }
get f(){
return this.myForm.controls;
}
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]);
}
}
}
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);
}
Now we are ready to run both:
Run Angular App:
ng serve
Run PHP API:
php -S localhost:8001
Now you can run and check it.
I hope it can help you...
Hardik Savani
I'm a full-stack developer, entrepreneur and owner of ItSolutionstuff.com. I live in India and I love to write tutorials and tips that can help to other artisan. I am a big fan of PHP, Laravel, Angular, Vue, Node, Javascript, JQuery, Codeigniter and Bootstrap from the early stage. I believe in Hardworking and Consistency.
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