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Validation

The uploader component validate the selected files extension and size using the allowedExtentions, minFileSize and maxFileSizeproperties. The files can be validated before uploading to the server and can be ignored on uploading. Also, you can validate the files by setting the HTML attributes to the original input element. The validation process occurs on drag-and-drop the files also.

File type

You can allow the specific types of files alone to upload using the allowedExtentions property. The extension can be represented as collection by comma separators. The uploader component filters the selected or dropped files matched against the specified file types and processes the upload operation. The validation happens when you specify value to inline attribute accept to original input element.

Source
Preview
app.component.ts
app.module.ts
main.ts
import { Component } from '@angular/core';

@Component({
    selector: 'app-root',
    template: `
               <ejs-uploader #defaultupload  [asyncSettings]='path' allowedExtensions = '.jpg,.png'></ejs-uploader>
              `
})
export class AppComponent {
     public path: Object = {
      saveUrl: 'https://aspnetmvc.syncfusion.com/services/api/uploadbox/Save',
      removeUrl: 'https://aspnetmvc.syncfusion.com/services/api/uploadbox/Remove' };
    constructor() {
    }
}
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 {
}
import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { enableProdMode } from '@angular/core';
import { AppModule } from './app.module';

enableProdMode();
platformBrowserDynamic().bootstrapModule(AppModule);

File size

The uploader component allows you to validate the files based on its size. The validation helps to restrict uploading large files or empty files to the server. The size can be represented in bytes. By default, the uploader component allows you to upload minimum file size as 0 byte and maximum file size as 28.4 MB using using minFileSize and maxFileSize properties.

Source
Preview
app.component.ts
app.module.ts
main.ts
import { Component } from '@angular/core';

@Component({
    selector: 'app-root',
    template: `
               <ejs-uploader #defaultupload  [asyncSettings]='path' minFileSize = 10000 maxFileSize = 1500000></ejs-uploader>
              `
})
export class AppComponent {
     public path: Object = {
      saveUrl: 'https://aspnetmvc.syncfusion.com/services/api/uploadbox/Save',
      removeUrl: 'https://aspnetmvc.syncfusion.com/services/api/uploadbox/Remove' };
    constructor() {
    }
}
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 {
}
import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { enableProdMode } from '@angular/core';
import { AppModule } from './app.module';

enableProdMode();
platformBrowserDynamic().bootstrapModule(AppModule);

Maximum files count

You can restrict uploading the maximum number of files using the selected event. In the selected event arguments, you can get the currently selected files details using the getFilesData(). You can modify the files details and assign the modified file list to the eventArgs.modifiedFilesData.

Source
Preview
app.component.ts
app.module.ts
main.ts
import { Component, ViewChild } from '@angular/core';
import {  FileInfo, SelectedEventArgs  } from '@syncfusion/ej2-inputs';
import { detach } from '@syncfusion/ej2-base';
import { createSpinner, showSpinner, hideSpinner } from '@syncfusion/ej2-popups';

@Component({
    selector: 'app-root',
    template: `
               <ejs-uploader #defaultupload autoUpload='false'  [asyncSettings]='path' minFileSize = 10000 allowedExtensions = '.doc, .docx, .xls, .xlsx' (selected)="onFileSelected($event)" (success)="onUploadSuccess($event)"></ejs-uploader>
              `
})
export class AppComponent {
    public path: Object = {
      saveUrl: 'https://aspnetmvc.syncfusion.com/services/api/uploadbox/Save',
      removeUrl: 'https://aspnetmvc.syncfusion.com/services/api/uploadbox/Remove' };
    @ViewChild('defaultupload')
    public uploadObj: UploaderComponent;
    public onFileSelected(args : SelectedEventArgs) : void {
        // Filter the 5 files only to showcase
        args.filesData.splice(5);
        let filesData : FileInfo[] = this.uploadObj.getFilesData();
        let allFiles : FileInfo[] = filesData.concat(args.filesData);
        if (allFiles.length > 5) {
            for (let i : number = 0; i < allFiles.length; i++) {
                if (allFiles.length > 5) {
                    allFiles.shift();
                }
            }
            args.filesData = allFiles;
            // set the modified custom data
            args.modifiedFilesData = args.filesData;
        }
        args.isModified = true;
    }
    public onUploadSuccess(args: any): void {
        let li: HTMLElement = this.uploadObj.uploadWrapper.querySelector('[data-file-name="' + args.file.name + '"]');
        if (args.operation === 'upload') {
            (li.querySelector('.e-file-delete-btn') as HTMLElement).onclick = () => {
                this.generateSpinner(this.uploadObj.uploadWrapper);
            };
            (li.querySelector('.e-file-delete-btn') as HTMLElement).onkeydown = (e: any) => {
                if (e.keyCode === 13) {
                    this.generateSpinner(e.target.closest('.e-upload'));
                }
            };
        } else {
            hideSpinner(this.uploadObj.uploadWrapper);
            detach(this.uploadObj.uploadWrapper.querySelector('.e-spinner-pane'));
        }
    }
    public generateSpinner(targetElement: HTMLElement): void {
        createSpinner({ target: targetElement, width: '25px' });
        showSpinner(targetElement);
    }
    constructor() {
    }
}
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 {
}
import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { enableProdMode } from '@angular/core';
import { AppModule } from './app.module';

enableProdMode();
platformBrowserDynamic().bootstrapModule(AppModule);

Duplicate files

You can validate the duplicate files before uploading to server using the selected event. Compare the selected files with the existing files data and filter the file list by removing the duplicate files.

Source
Preview
app.component.ts
app.module.ts
main.ts
import { Component, ViewChild } from '@angular/core';
import {  FileInfo } from '@syncfusion/ej2-inputs';
import { isNullOrUndefined } from '@syncfusion/ej2-base';

@Component({
    selector: 'app-root',
    template: `
               <ejs-uploader #defaultupload autoUpload='false'  [asyncSettings]='path' (selected)="onFileSelect($event)" ></ejs-uploader>
              `
})
export class AppComponent {
    public path: Object = {
      saveUrl: 'https://aspnetmvc.syncfusion.com/services/api/uploadbox/Save',
      removeUrl: 'https://aspnetmvc.syncfusion.com/services/api/uploadbox/Remove' };
    @ViewChild('defaultupload')
    public uploadObj: UploaderComponent;
    public onFileSelect(args : any) {
    let existingFiles: FileInfo[] = this.uploadObj.getFilesData();
    for (let i: number = 0; i < args.filesData.length; i++) {
        for(let j: number = 0; j < existingFiles.length; j++) {
            if (!isNullOrUndefined(args.filesData[i])) {
                if (existingFiles[j].name == args.filesData[i].name) {
                    args.filesData.splice(i, 1);
                }
            }
        }
    }
    existingFiles = existingFiles.concat(args.filesData);
    args.modifiedFilesData = existingFiles;
    args.isModified = true;
}
    constructor() {
    }
}
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 {
}
import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { enableProdMode } from '@angular/core';
import { AppModule } from './app.module';

enableProdMode();
platformBrowserDynamic().bootstrapModule(AppModule);

See Also