User Actions On a Page

There are a few potential options to explore here...

• FreeMarker Activity Results - You can use the activity context object to determine when certain actions have occured. http://lithosphere.lithium.com/t5/Developers-Knowledge-Base/Context-objects-for-custom-components-activity/ta-p/39936
• JavaScript Activity Results - Similar to the FreeMarker Activity Results, you can also get those results in JavaScript via the "LITHIUM.CommunityJsonObject" object
• jQuery - jQuery makes it easy to bind listeners to elements in the page. Here's an interesting example another user posted about performing some actions when the user clicks the "Post" button: http://lithosphere.lithium.com/t5/Developers/RestAPI-amp-Tags/m-p/44623#M1243

I hope this helps!