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Check File Size before Uploading it in Angular Uploader component

08 Dec 2022 / 1 minute to read

By using uploading event, you can get the file size before upload it to server. File object contains the file size in bytes only. You can convert the size to standard formats (KB or MB) using bytesToSize method.

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

export class AppComponent {
    public uploadObj: UploaderComponent;
    public autoUpload: boolean = false;
    public path: Object = {
        saveUrl: '',
        removeUrl: ''
    public onBeforeUpload: EmitType<Object> = (args: any) => {
        // get the file size in bytes
        let sizeInBytes: number = args.fileData.size;
        // get the file size in standard format
        alert("File size is: " + this.uploadObj.bytesToSize(sizeInBytes));
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import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import { UploaderModule } from '@syncfusion/ej2-angular-inputs';

 * Module
    imports: [
        BrowserModule, UploaderModule
    declarations: [AppComponent],
    bootstrap: [AppComponent]
export class AppModule {
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import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { enableProdMode } from '@angular/core';
import { AppModule } from './app.module';

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<div class="control-section">
    <div class="control_wrapper">          
        <ejs-uploader #defaultupload id='fileupload' [asyncSettings]='path' [autoUpload]='autoUpload' (uploading)='onBeforeUpload($event)' ></ejs-uploader>
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#container {
  visibility: hidden;
  margin: 0 auto;
  width: 300px;

#loader {
  color: #008cff;
  font-family: 'Helvetica Neue','calibiri';
  font-size: 14px;
  height: 40px;
  left: 45%;
  position: absolute;
  top: 45%;
  width: 30%;

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.