Detect whether the value change happened by manual or programmatic in Angular DropDownList component

import { Component , ViewChild} from '@angular/core';
import { DropDownListComponent } from '@syncfusion/ej2-angular-dropdowns';

@Component({
    selector: 'app-root',
    // specifies the template path for DropDownList component
    templateUrl: `./template.html`
})
export class AppComponent {
    constructor() {
    }
    ngAfterViewInit(){
        document.getElementById('btn').onclick = () => {
            this.dropDownListObject.value = 'game3';
        }
    }
    // defined the array of data
    public data: { [key: string]: Object }[] = [ { Id: 'game1', Game: 'Badminton' },
                 { Id: 'game2', Game: 'Football' }, { Id: 'game3', Game: 'Tennis' }];
    // maps the appropriate column to fields property
    public fields: Object = { text: 'Game', value: 'Id' };
    //set the placeholder to DropDownList input
    public text: string = "Select a game";
    @ViewChild('ddlelement')
    public dropDownListObject: DropDownListComponent;
    onChange(args): void {
        let element: HTMLElement = document.createElement('p');
        if (args.isInteracted) {
            element.innerText = 'Changes happened by Interaction';
        } else {
            element.innerText = 'Changes happened by programmatic';
        }
        document.getElementById('event').append(element);
    }
}

import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { FormsModule } from '@angular/forms';
import { AppComponent } from './app.component';
import { DropDownListModule } from '@syncfusion/ej2-angular-dropdowns';
/**
 * Module
 */
@NgModule({
    imports: [
        BrowserModule,FormsModule, DropDownListModule
    ],
    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);

<div class="control-section">
    <div class="content-wrapper"> 
        <div id='icon'>
            <div class="content" style="margin: 50px auto 0; width:250px;">
				<ejs-dropdownlist id='ddlelement' #ddlelement [dataSource]='data' [fields]='fields' [placeholder]='text' (change)='onChange($event)'></ejs-dropdownlist>
                <div style='padding: 50px 0'>
					<button id='btn' ej-button #btn class="e-control e-btn"> Set Value Dynamically </button>
				</div>
				<p id='event'></p>
            </div>
        </div>
    </div>
</div>