[Edit]

js capture right-click event

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<!--
    Warning: using this approach be sure the right mouse button has number 3.
-->

<!doctype html>
<html>
<body>
  <button id="my-button">Right-click me</button>
  <script>

    var myButton = document.querySelector('#my-button');

    var activeCase = null; // stores number of pressed mouse button
    
    myButton.addEventListener('mousedown', function(e) {
      activeCase = e.which;
    });
    
    myButton.addEventListener('mouseup', function(e) {
      if (activeCase === 3) { // in 3 buttons mouse (left + scroll + right buttons) right one will have number 3
        activeButton = null;
        console.log('Right button clicked!');
      }
    });
    
    myButton.addEventListener('blur', function(e) {
      activeButton = null;
    });

  </script>
</body>
</html>