http://stackoverflow.com/questions/1759987/listening-for-variable-changes-in-javascript-or-jquery

Firefox specific:
- 
https://developer.mozilla.org/en-US/docs/JavaScript/Reference/Global_Objects/Object/watch
- FireBug: Lets mark a method to be logged (incl. method parameters) every 
time it is called. See http://getfirebug.com/javascript and scroll down to 
"Logging function calls". Maybe that would be enough for you?

Browsers DevTools only shows you variable content when a breakpoint is 
active and you step through the script line by line (variable watches). But 
while in a breakpoint you can't do your drag/drop action you want to 
observe.

If FireBug does not work for you, you are probably faster in simply using 
java.util.logging.Logger in your code and disable logging for production 
compilations.

-- J.

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