The possible event triggers are:
OnClick, OnMouseOver, OnMouseOut, OnMouseDown and OnMouseUp
This feature provides many new possibilities for you to explore. You can fire a Google Analytics event on a specific element to optimize your landing page far more than the simple A/B tests many marketers perform.
Knowing which elements your visitors view or click on can give you additional information on what can be optimized.
When you right-click on an element (with the exception of two elements: Form & HTML Code) a menu appears containing a ‘Manage Events’ option: