Set cursor position while focus on the input textbox in React Maskedtextbox component

29 Aug 20236 minutes to read

By default, on focusing the MaskedTextBox the entire mask gets selected. You can customize by using any one of the following methods:

• Setting cursor position at the start of the MaskedTextBox.
• Setting cursor position at the end of the MaskedTextBox.
• Setting cursor at the specified position in the MaskedTextBox.

The selectionStart and selectionEnd set to 0 instead of the input element value’s length, when we focus on a MaskedTextBox control filled with all mask characters. This is the default behavior of the HTML 5 input element.

Following is an example that demonstrates the above cases to set cursor position in the MaskedTextBox using focus event.

index.jsx

import { MaskedTextBoxComponent } 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) {
        super(props);
        this.onfocus = this.onfocus.bind(this);
        this.onfocus1 = this.onfocus1.bind(this);
        this.onfocus2 = this.onfocus2.bind(this);
    }
    onfocus(args) {
        // sets cursor position at start of MaskedTextBox
        args.selectionEnd = args.selectionStart = 0;
    }
    onfocus1(args) {
        // sets cursor position at end of MaskedTextBox
        args.selectionStart = args.selectionEnd = args.maskedValue.length;
    }
    onfocus2(args) {
        // sets cursor at specified position
        args.selectionStart = 3;
        args.selectionEnd = 3;
    }
    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="83929-4342" floatLabelType='Always' focus={this.onfocus}/>
          <MaskedTextBoxComponent name="mask_value3" placeholder="Cursor positioned at end" mask="00000-00000" value="83929-3213" floatLabelType='Always' focus={this.onfocus1}/>
          <MaskedTextBoxComponent name="mask_value4" placeholder="Cursor at specified position" mask="[phone]" value="234-432-432" floatLabelType='Always' focus={this.onfocus2}/>
        </div>);
    }
}
;
ReactDOM.render(<App />, document.getElementById('masktextbox'));

index.tsx

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 = 0;
  }
  public onfocus1(args: MaskFocusEventArgs) {
      // sets cursor position at end of MaskedTextBox
      args.selectionStart=args.selectionEnd = args.maskedValue.length;
  }
  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="83929-4342" floatLabelType='Always' focus={this.onfocus}/>
          <MaskedTextBoxComponent name="mask_value3" placeholder="Cursor positioned at end" mask= "00000-00000" value="83929-3213" floatLabelType='Always' focus={this.onfocus1}/>
          <MaskedTextBoxComponent name="mask_value4" placeholder="Cursor at specified position" mask= "[phone]" value="234-432-432" floatLabelType='Always' focus={this.onfocus2}/>
        </div>
      );
  }
};
ReactDOM.render(<App />, document.getElementById('masktextbox'));