HTML5 Widgets - does the onUnload function ever fire?

Question

The documentation for HTML5 widgets (Captivate 6 help) says that we can unload the widget via this function that is called by Captivate:
//To unload your widget onUnload:
onUnload: function()
     /*Unload your widget here*/
I was having problems with the widget and some of these led me to wonder if this function was being called. I have tried on both Ipad and browser setting a breakpoint here and the code I have written never seems to be called.
I have also put in code to write to the console and it isn't happening.
Does anyone know if I'm doing something wrong - do I need to attach an event handler to the captivate object - I had assumed it would just be called in the same way as onLoad.  If not, does anyone know how else I might intercept the unloading of the widget (give the documentation warns against trying to do it by attaching to native onunload events)?  This is becoming an urgent problem for me so I would be hugely grateful for any advice.

Answer 1

I tried attaching to native onunload events and had some problems making it work.  It may have been my implementation, but I couldn't attach to onunload and have my widget still in existence to handle it.  In case it is useful for others what I ended up using, and it seems to do the trick, is attach to Captivate's Slide Exit Event - which worked for my case but maybe not for all: 
this .eventDisp = this.movieProps.eventDispatcher;
this .eventDisp.addEventListener(this.eventDisp.SLIDE_EXIT_EVENT, this.onExitSlide, this);