Answers for "on click disable function"

disable div click

// To disable:    
document.getElementById('id').style.pointerEvents = 'none';
// To re-enable:
document.getElementById('id').style.pointerEvents = 'auto'; 
// Use '' if you want to allow CSS rules to set the value

disabled a click

// CSS
.not-active {
  pointer-events: none;
  cursor: default;
  text-decoration: none;
  color: black;
}

// HTML
<a href="link.html" class="not-active">Link</a>