Detect and warn users about caps lock is on

user_4812272 0
Viewed 8470

How to implement to detecting and warning users when caps lock is on with (or not) tooltip style in typescript (angular 4.2.2)?? Maybe with some keyup events, or like toUpperCase() in JS.

angular typescript capslock javascript
4 Answers

Detect CapsLock on click, keyup and keydown on current window. No need to add any event in html doc

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

export class LoginComponent implements OnInit {

constructor(){}

ngOnInit() {}

@HostListener('window:click', ['$event']) onClick(event){
 if (event.getModifierState && event.getModifierState('CapsLock')) {
   this.capslockOn = true;
  } else {
   this.capslockOn = false;
  }
 }

@HostListener('window:keydown', ['$event'])
onKeyDown(event){
if (event.getModifierState && event.getModifierState('CapsLock')) {
  this.capslockOn = true;
  } else {
   this.capslockOn = false;
  }
}

@HostListener('window:keyup', ['$event'])
 onKeyUp(event){
 if (event.getModifierState && event.getModifierState('CapsLock')) {
  this.capslockOn = true;
 } else {
  this.capslockOn = false;
 }
}

}
user_44075970 
@HostListener('window:click', ['$event'])
@HostListener('window:keydown', ['$event'])
@HostListener('window:keyup', ['$event'])
onCapsCheck(event: MouseEvent | KeyboardEvent) {
    this.capsOn = !!(event.getModifierState && event.getModifierState('CapsLock'));
}
user_94019860
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