Achieve file upload programmatically

import { Component, ViewChild, AfterViewInit } from '@angular/core';
import { UploaderComponent } from '@syncfusion/ej2-angular-inputs';
@Component({
    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://aspnetmvc.syncfusion.com/services/api/uploadbox/Save',
        removeUrl: 'https://aspnetmvc.syncfusion.com/services/api/uploadbox/Remove'
    };
    ngAfterViewInit(): void {
        document.getElementById('first').onclick = (args) => {
            this.uploadObj.upload(this.uploadObj.getFilesData()[0]);
        };
        document.getElementById('full').onclick = (args) => {
            this.uploadObj.upload(this.uploadObj.getFilesData());
        };
    }
}

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);

<div class="control-section">
    <div class="control_wrapper">          
        <ejs-uploader #defaultupload id='fileupload' [asyncSettings]='path' [autoUpload]='autoUpload' ></ejs-uploader>
    </div>
    <span style=' padding-left: 40px; margin-top: 30px'>
        <button id='first' class='e-btn e-control'>Upload first file</button>
    </span>
    <span style=' padding-left: 40px; margin-top: 30px'>
        <button id='full' class='e-btn e-control'>Upload all files</button>
    </span>
</div>

#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%;
}
.control_wrapper {
  max-width: 500px;
  margin: auto;
}
.e-upload {
  width: 100%;
  position: relative;
  margin-top: 15px;
  margin-bottom: 15px;
}
.e-upload-actions {
display: none;
}
.e-btn {
  text-transform: none;
}