Validate image on drop in Angular Uploader component

23 Jan 20244 minutes to read

The uploader component allows you to upload all type of images by setting *image/ ** to allowedExtensions property.
You can directly set it to accept attribute of uploader element.

By default, the behavior is working with select a file using browse button. But, this behavior doesn’t support on drag and drop the files. You can handle this behavior manually using selected event by filtering the file types from application.

In the following example, validated image files using images/*. You are able to drag and drop the image files with extension of PNG, JPG, BPG, GIF and TIFF to upload it.

app.component.ts

import { Component } from '@angular/core';
import { EmitType } from '@syncfusion/ej2-base';
import { SelectedEventArgs, UploaderComponent } from '@syncfusion/ej2-angular-inputs';
import {  } from '@syncfusion/ej2-angular-inputs';
@Component({
    selector: 'app-root',
    templateUrl: './default.html',
    styleUrls: ['./index.css']
})

export class AppComponent {

   public path: Object = {
       saveUrl: 'https://services.syncfusion.com/angular/production/api/FileUploader/Save',
       removeUrl: 'https://services.syncfusion.com/angular/production/api/FileUploader/Remove'
   };
    public onSelected: EmitType<SelectedEventArgs> = (args: any) =>  {
        if (event!.type === 'drop') {
            let allImages: Array<string> = ['png', 'jpg', 'jpeg', 'gif', 'tiff', 'bpg'];
            let files = args.filesData;
            let modifiedFiles = [];
            for (let file of files) {
              if (allImages.indexOf(file.type) === -1) {
                file.status = 'File type is not allowed';
                file.statusCode = '0';
              }
              modifiedFiles.push(file);
            }
            args.isModified = true;
        }
   };
}

app.module.ts

import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import { UploaderModule } from '@syncfusion/ej2-angular-inputs';

/**
 * Module
 */
@NgModule({
    imports: [
        BrowserModule, UploaderModule
    ],
    declarations: [AppComponent],
    bootstrap: [AppComponent]
})
export class AppModule {
}

main.ts

import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { enableProdMode } from '@angular/core';
import { AppModule } from './app.module';

import 'zone.js';
enableProdMode();
platformBrowserDynamic().bootstrapModule(AppModule);

You can also explore Angular File Upload feature tour page for its groundbreaking features. You can also explore our Angular File Upload example to understand how to browse the files which you want to upload to the server.