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Add Items in Angular ListBox component

To add an item or multiple items, addItems method can be used. In the following example, the Bugatti Veyron Super Sport and SSC Ultimate Aero items will be added while clicking Add Items button.

Source
Preview
app.component.ts
app.module.ts
main.ts
import { Component } from '@angular/core';
import { getInstance } from '@syncfusion/ej2-base';
import { ListBox } from '@syncfusion/ej2-dropdowns';

@Component({
    selector: 'app-container',
    template: `<button (click)="btnclick()" class="e-btn">ADD ITEMS</button>
               <ejs-listbox id="listbox" [dataSource]="data"></ejs-listbox>`
})

export class AppComponent {
public data: { [key: string]: Object }[] = [
    { text: 'Hennessey Venom', id: 'list-01' },
    { text: 'Bugatti Chiron', id: 'list-02' },
    { text: 'Koenigsegg CCR', id: 'list-05' },
    { text: 'McLaren F1', id: 'list-06' },
    { text: 'Aston Martin One- 77', id: 'list-07' },
    { text: 'Jaguar XJ220', id: 'list-08' },
    { text: 'McLaren P1', id: 'list-09' },
    { text: 'Ferrari LaFerrari', id: 'list-10' }
];

btnclick(){
    let listboxobj:ListBox = getInstance(document.getElementById("listbox"), ListBox) as ListBox;
    let addItem: { [key: string]: Object }[] = [
      { text: 'Bugatti Veyron Super Sport', id: 'list-03' }, { text: 'SSC Ultimate Aero', id: 'list-04' }
    ];
    if (!listboxobj.getDataByValue('Bugatti Veyron Super Sport')) {
        listboxobj.addItems(addItem);
    }
  }
}
import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { FormsModule, ReactiveFormsModule } from '@angular/forms';
import { AppComponent } from './app.component';
import { ListBoxComponent } from '@syncfusion/ej2-angular-dropdowns';
import { ButtonComponent } from '@syncfusion/ej2-angular-buttons';
/**
 * Module
 */
@NgModule({
    imports: [
        BrowserModule,FormsModule, ReactiveFormsModule
    ],
    declarations: [AppComponent, ListBoxComponent, ButtonComponent],
    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);