In chrome: hover the element - from the context menu "View element code" (or F12, Elements tab, find the desired element) - in the right part, see the Properties sub-item, open the first sub-item in this part and see the attribute value (for example, onclick) , there is either null (not assigned), or just function () (it means, somewhere in the code the handler is set, press the right button, there is one show function definition, throws on the declaration of this function), the code in the attribute of the element can be seen by element.
And what's the problem to put breakpoint on the handler?
Is it possible a little more? Where to set breakpoint and how?
In chrome, in the web inspector, go to the Sources tab, and under the Elements tab there is a button with an arrow; by clicking on it you can select the file where the script is located. Next, just click on the line number where you need to set breakpoint. A blue pointer appears. Everything! Now the script will stop at this place.
Purely for debugging, download jquery not min - http://code.jquery.com/jquery-1.8.1.js - in this case you will see the necessary line.