Javascript Stack Trace in IE (or maybe just a simple Javascript error)

Question

I came across this method to produce a Javascript stack trace (to fix an IE specific bug): http://pastie.org/253058.txt which sounds really useful, but when I call it, the stack trace I get is for the code of the script itself?!

Probably a simple for someone who knows javascipt, but I don't!

Or if you can suggest a better way to get a stack trace in IE, please let me know.

Answer 1

You might be better off using IE 8's built-in debugger.

Answer 2

This getStackTrace() function creates the stack trace of the function from which you've called getStackTrace(). It does not create the stack trace of an error that you've caught. For example, you'd use it to try to figure out how a specific function is being called:

function foo() {
    // debug how this is being called
    alert(YOUR_NAMESPACE.getStackTrace());
}

Or to add some more detail to an error you raise:

function foo() {
    // signal something went wrong
    var error = new Error("error in foo");
    if (!error.stack)
        error.stack = YOUR_NAMESPACE.getStackTrace();
    throw error;
}

You can not use it like this:

try {
    foo();
} catch (e) {
    alert(YOUR_NAMESPACE.getStackTrace(e));
}

Here's a good rundown of what stack information you can get -- and from which browsers -- when an error occurs: Three Painful Ways to Obtain a Stack Trace in Javascript