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?!

Can this code be changed to produce a general stack trace? Or is there a better way to get a stack trace in IE?

(function () {

YOUR_NAMESPACE.getStackTrace = (function () {

var mode;
try {(0)()} catch (e) {
    mode = e.stack ? 'Firefox' : window.opera ? 'Opera' : 'Other';
}

switch (mode) {
    case 'Firefox' : return function () {
        try {(0)()} catch (e) {
            return e.stack.replace(/^.*?\n/,'').
                           replace(/(?:\n@:0)?\s+$/m,'').
                           replace(/^\(/gm,'{anonymous}(').
                           split("\n");
        }
    };

    case 'Opera' : return function () {
        try {(0)()} catch (e) {
            var lines = e.message.split("\n"),
                ANON = '{anonymous}',
                lineRE = /Line\s+(\d+).*?in\s+(http\S+)(?:.*?in\s+function\s+(\S+))?/i,
                i,j,len;

            for (i=4,j=0,len=lines.length; i<len; i+=2) {
                if (lineRE.test(lines[i])) {
                    lines[j++] = (RegExp.$3 ?
                        RegExp.$3 + '()@' + RegExp.$2 + RegExp.$1 :
                        ANON + RegExp.$2 + ':' + RegExp.$1) +
                        ' -- ' + lines[i+1].replace(/^\s+/,'');
                }
            }

            lines.splice(j,lines.length-j);
            return lines;
        }
    };

    default : return function () {
        var curr  = arguments.callee.caller,
            FUNC  = 'function', ANON = "{anonymous}",
            fnRE  = /function\s*([\w\-$]+)?\s*\(/i,
            stack = [],j=0,
            fn,args,i;

        while (curr) {
            fn    = fnRE.test(curr.toString()) ? RegExp.$1 || ANON : ANON;
            args  = stack.slice.call(curr.arguments);
            i     = args.length;

            while (i--) {
                switch (typeof args[i]) {
                    case 'string'  : args[i] = '"'+args[i].replace(/"/g,'\\"')+'"'; break;
                    case 'function': args[i] = FUNC; break;
                }
            }

            stack[j++] = fn + '(' + args.join() + ')';
            curr = curr.caller;
        }

        return stack;
    };
}

})();

What do you mean "for the code of the script itself"? The call to the stack trace code should be at the top of the stack trace, but then under that is your caller, right? — Jeremy Stein
– Jeremy Stein, Commented Oct 1, 2009 at 14:47
Hi Jeremy, That may be the case. I'm displaying the text using alert(), but the text I'm getting back ends in '...' so maybe it's too big and the actual trace is just below this. Is it possible to remove the 'trace function' call from the output? — Gavin
– Gavin, Commented Oct 1, 2009 at 16:10

Bart · Accepted Answer · 2012-06-27 08:13:52Z

12

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 (Archive.org link replacing dead link)

edited Jun 27, 2012 at 8:13

Bart

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answered Oct 1, 2009 at 20:15

Justin Ludwig

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1 Comment

Gavin Over a year ago

Thanks Justin, this is what I was looking for. The problem appears to be the way I was calling it. Thanks a lot.

Tim Down · Accepted Answer · 2009-10-01 09:54:17Z

-1

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

answered Oct 1, 2009 at 9:54

Tim Down

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3 Comments

Gavin Over a year ago

Thanks for your suggestion. Unfortunately, i'm stuck with IE7 (corporate network and all that).

Mike Blandford Over a year ago

Even with IE7 you can turn javascript debugging on in internet options and launch visual studio on error.

Gavin Over a year ago

Thanks for your suggestion Mike. Unfortunately, due to the same network restrictions I can't enable the Javascript debugger in IE.

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