How to add a custom right-click menu to a webpage?

I want to add a custom right-click menu to my web application. Can this be done without using any pre-built libraries? If so, how to display a simple custom right-click menu which does not use a 3rd party JavaScript library?

I'm aiming for something like what Google Docs does. It lets users right-click and show the users their own menu.

NOTE: I want to learn how to make my own versus using something somebody made already since most of the time, those 3rd party libraries are bloated with features whereas I only want features that I need so I want it to be completely hand-made by me.

Solution

Answering your question - use contextmenu event, like below:

if (document.addEventListener) {
  document.addEventListener('contextmenu', function(e) {
    alert("You've tried to open context menu"); //here you draw your own menu
    e.preventDefault();
  }, false);
} else {
  document.attachEvent('oncontextmenu', function() {
    alert("You've tried to open context menu");
    window.event.returnValue = false;
  });
}

<body>
  Lorem ipsum...
</body>

But you should ask yourself, do you really want to overwrite default right-click behavior - it depends on application that you're developing.

JSFIDDLE