in javascript get the callstack that lead to error

Question

The problem is not getting the callstack in general, which can be done as described here: http://eriwen.com/javascript/js-stack-trace/ but rather in accessing the callstack that triggered the event, from the handler of the event.

In particular I'm interested in logging the callstack from the window error event

window.onerror = function(msg, url, line) { 
 //callstack // would be nice to have.
//log callstack or whatever. (note this can be done w/ ajax and service, and is not the question at hand.
}

but I do know how to log the error. (I use jquery's .ajax, and a service)

Will browsers make this possible ever? Is it currently possible? Maybe I am going about this the wrong way. How can I add a simple function (i.e. not modify all the functions in my codebase) to detect whenever there is an error, and also log the call stack.

Thanks for the answers so far and sorry if the question was initially poorly worded.

Answer 1

The Error object has a non-standard stack property on Mozilla, it seems to work in Google Chrome too, not IE9.

function test() {
  try {//can't think of anything that causes an exception?
      throw new Error("boo");
  }
  catch(e)
  {
      alert(e.stack);
  }
}
test();​

See the fiddle: http://jsfiddle.net/Cq5RJ/