Directive to disable Cut, Copy and Paste function

Question

I am using Angular2 to restrict the copy and paste in textbox. But how do i write a custom directive, so that it will be easy to apply for all the text fields.

Below is the working code to restrict the copy and paste functionality.

<ion-input formControlName="confirmpass" type="tel" (cut)="$event.preventDefault()" (copy)="$event.preventDefault()" (paste)="$event.preventDefault()"></ion-input>

Answer 1

You can use Renderer to listen to cut,copy,paste events and call preventDefault() in your directive something like

@Directive({ selector: '[preventCutCopyPaste]' })

export class CopyDirective {
    constructor(el: ElementRef, renderer: Renderer) {
      var events = 'cut copy paste';
      events.split(' ').forEach(e => 
      renderer.listen(el.nativeElement, e, (event) => {
        event.preventDefault();
        })
      );

    }
}

Then in html

<input type="text" preventCutCopyPaste/>

Working Demo

Answer 2

You can use a HostListener in your directive to catch cut, paste and copy events and then use preventDefault(). Here's an example

import { Directive, HostListener } from '@angular/core';

@Directive({
  selector: '[appBlockCopyPaste]'
})
export class BlockCopyPasteDirective {
  constructor() { }

  @HostListener('paste', ['$event']) blockPaste(e: KeyboardEvent) {
    e.preventDefault();
  }

  @HostListener('copy', ['$event']) blockCopy(e: KeyboardEvent) {
    e.preventDefault();
  }

  @HostListener('cut', ['$event']) blockCut(e: KeyboardEvent) {
    e.preventDefault();
  }
}

Use directive like so

<ion-input appBlockCopyPaste formControlName="confirmpass" type="tel"></ion-input>

Working demo