Set cursor position while focus on the input textbox

import { MaskedTextBoxComponent, MaskFocusEventArgs } from '@syncfusion/ej2-react-inputs';
import * as React from "react";
import * as ReactDOM from "react-dom";

export default class App extends React.Component<{}, {}> {
   constructor(props: any) {
    super(props);
    this.onfocus = this.onfocus.bind(this);
    this.onfocus1 = this.onfocus1.bind(this);
    this.onfocus2 = this.onfocus2.bind(this);
  }
  public onfocus(args: MaskFocusEventArgs) {
      // sets cursor position at start of MaskedTextBox
      args.selectionEnd= args.selectionStart;
  }
  public onfocus1(args: MaskFocusEventArgs) {
      // sets cursor position at end of MaskedTextBox
      args.selectionStart=args.selectionEnd;
  }
  public onfocus2(args: MaskFocusEventArgs) {
      // sets cursor at specified position
      args.selectionStart = 3;
      args.selectionEnd = 3;
  }
  public render() {
      return (
        <div>
          <br/><MaskedTextBoxComponent name="mask_value1" placeholder="Default cursor position" mask= "00000-00000" value="93828-32132" floatLabelType='Always'/>
          <MaskedTextBoxComponent name="mask_value2" placeholder="Cursor positioned at start" mask= "00000-00000" value="83929-43427" floatLabelType='Always' focus={this.onfocus}/>
          <MaskedTextBoxComponent name="mask_value3" placeholder="Cursor positioned at end" mask= "00000-00000" value="83929-32131" floatLabelType='Always' focus={this.onfocus1}/>
          <MaskedTextBoxComponent name="mask_value4" placeholder="Cursor at specified position" mask= "+1 000-000-0000" value="234-432-4324" floatLabelType='Always' focus={this.onfocus2}/>
        </div>
      );
  }
};
ReactDOM.render(<App />, document.getElementById('masktextbox'));