When attempting to modify the mask format in a template-driven form, it becomes challenging to reset the value of an

When dealing with a text box, I encounter an issue where I need to adjust the mask format based on user input and clear the text box. However, changing the mask format does not result in the text box being cleared. Conversely, removing the mask format condition allows for successful clearing of the text box.

html

<input type="text" mask="{{maskFormat}}" [(ngModel)]="empId" />

<button (click)="toggleMask()">Change Mask</button>

TS

import { Component } from '@angular/core';

@Component({
  selector: 'my-app',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.css']
})
export class AppComponent {
  name = 'Angular';

  maskFormat: string = '000';
  empId: string;

  toggleMask(): void {

    if (this.maskFormat.length == 3) {
      this.maskFormat = "000000";
    }
    else {
      this.maskFormat = "000";
    }


    this.empId = "";

  }

}


Note: The ngx-mask package is being utilized

stackblitz

Answer №1

It seems that the ngx-mask module is recalculating the value and then updating the model after running your this.empId = "";.

To ensure that the ngx-mask code runs before your code, you can use a setTimeout function with a zero timer to delay setting the value by one life cycle in Angular.

setTimeout(() => { this.empId = null }, 0);

This solution may not be the most elegant, but it effectively addresses the issue without delving into the workings of the ngx-mask module.

Check out this functioning StackBlitz example for reference.

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