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How to check caps lock is on in javascript

You can check caps lock is on or not in javascript by using getModifierState() method on keyup event. It will display a message if the caps lock button is on using getModifierState() which returns true if the modifier is active and false if it is not active.

  • Display message if caps lock is on in javascript 

    <input type="password" name="password" id="password" placeholder="Enter password"/>
<div id="message"></div>
  
<script>
    const password = document.querySelector('#password');
    const message = document.querySelector('#message');
    password.addEventListener('keyup', function (e) {
       if (e.getModifierState('CapsLock')) {
           message.textContent = 'Caps lock is on';
       } else {
           message.textContent = '';
       }
    });
</script>

    This code snippet helps you to show the message if the caps lock button is on. Just copy/paste code in body tag of HTML page or you can use it as per your requirements and it will display message on click caps lock button if it is on. 

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