How to perform an invisible upload in Angular Uploader

31 Aug 20263 minutes to read

Perform an invisible upload by handling the uploader’s selected event to suppress the default file list while the upload proceeds automatically. Because autoUpload is true by default, the selected files are uploaded automatically once selected; to hide the default file list, set args.cancel = true inside the selected event handler and render a custom preview instead. Refer to the example below.

app.ts

import { NgModule } from '@angular/core'
import { BrowserModule } from '@angular/platform-browser'
import { UploaderModule } from '@syncfusion/ej2-angular-inputs'



import { Component } from '@angular/core';
import { createElement } from '@syncfusion/ej2-base';
import { SelectedEventArgs } from '@syncfusion/ej2-angular-inputs';

/**
 * Default Uploader Default Component
 */
@Component({
imports: [
         UploaderModule
    ],


standalone: true,
    selector: 'app-root',
    templateUrl: './default.html',
    styleUrls: ['./index.css']
})
export class AppComponent {
public locale: string = 'en-US';
    public path: Object = {
        saveUrl: 'https://services.syncfusion.com/angular/production/api/FileUploader/Save',
        removeUrl: 'https://services.syncfusion.com/angular/production/api/FileUploader/Remove'
    };
  public allowExtensions: string = '.png, .jpg, .jpeg';
  public onSelected(args: SelectedEventArgs):void {
    for(let i = 0; i< args.filesData.length ; i++){
        let liparentDiv = createElement('div',  { className: 'image-list'});
        let liImage = createElement('img',  { className: 'image'});
        liparentDiv.appendChild(liImage);
        this.readURL(liImage, args.filesData[i]);
        (document.getElementById('preview') as HTMLElement).appendChild(liparentDiv);
    }
    args.cancel=true;
}

public readURL(liImage: HTMLElement, file: any):void {
    let imgPreview: HTMLImageElement | any = liImage as HTMLImageElement;
    let imageFile: File = file.rawFile;
    let reader: FileReader = new FileReader();
    reader.addEventListener( 'load', () => {
        imgPreview.src = reader.result;
    }, false);
    if (imageFile) {
        reader.readAsDataURL(imageFile);
    }
};
}

main.ts

import { bootstrapApplication } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import 'zone.js';
bootstrapApplication(AppComponent).catch((err) => console.error(err));

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