How to Detect Mouse Button Down and Mouse Button Up Events

I think you can show a layer when the state is down and hide the kayer when the object is clicked should work. 

Phil, your approach worked.  I'm uploading the solution.  May come in handy for others.

I know this is an old thread, but hopefully this is helpful to someone. It is possible to detect a mouse 'click' or a 'mousedown' or any other DOM event using Javascript. In the example below I asked the module to listen out for 'mousedown' and if the target was the scrollbar then some variable in Storyline is adjusted. 

document.addEventListener('mousedown', function(e) {
      let myClass = e.target.className; 
      //console.log(myClass);
      if (myClass === 'scrollarea-btn') {
              var player = GetPlayer();
              player.SetVar("monitor_panel_click",true);
      }
});

Hi Simon,

I am also looking for a solution for "Mouse Button up", so that some event is triggered when the mouse button is release while the mouse is positioned over a specific object.

I guess the JS should look like below. But what I don't understand: How do I figure out what class my object is?

It is not the name of my object, or is it? I tried using that in the attached test project.

document.addEventListener('mouseup', function(e) {
      let myClass = e.target.className; 
      //console.log(myClass);
      if (myClass === 'scrollarea-btn') {
              var player = GetPlayer();
              player.SetVar("monitor_panel_click",true);
      }
});