Check File Size Before Uploading in Angular Uploader Component

26 Feb 20262 minutes to read

Use the uploading event to obtain file sizes before uploading to the server. The file object reports size in bytes; convert it to KB or MB with the bytesToSize method.

app.component.ts

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

import { Component, ViewChild } from '@angular/core';
import { EmitType } from '@syncfusion/ej2-base';
import { UploaderComponent } from '@syncfusion/ej2-angular-inputs';
@Component({
imports: [
         UploaderModule
    ],


standalone: true,
    selector: 'app-root',
    templateUrl: './default.html',
    styleUrls: ['./index.css']
})

export class AppComponent {
    @ViewChild('defaultupload')
    public uploadObj?: UploaderComponent;
    public autoUpload: boolean = false;
    public path: Object = {
        saveUrl: 'https://services.syncfusion.com/angular/production/api/FileUploader/Save',
        removeUrl: 'https://services.syncfusion.com/angular/production/api/FileUploader/Remove'
    };
    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));
    }
}

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 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.