<html>
<head>
<script type="text/javascript">
function printStackTrace() {
var callstack = [];
var isCallstackPopulated = false;
try {
i.dont.exist+=0; //does not exist - that's the point
} catch(e) {
if (e.stack) { //Firefox
var lines = e.stack.split("\n");
for (var i = 0, len = lines.length; i < len; i++) {
if (lines[i].match(/^\s*[A-Za-z0-9\-_\$]+\(/)) {
callstack.push(lines[i]);
}
}
//Remove call to printStackTrace()
callstack.shift();
isCallstackPopulated = true;
}
else if (window.opera && e.message) { //Opera
var lines = e.message.split("\n");
for (var i = 0, len = lines.length; i < len; i++) {
if (lines[i].match(/^\s*[A-Za-z0-9\-_\$]+\(/)) {
var entry = lines[i];
//Append next line also since it has the file info
if (lines[i+1]) {
entry += " at " + lines[i+1];
i++;
}
callstack.push(entry);
}
}
//Remove call to printStackTrace()
callstack.shift();
isCallstackPopulated = true;
}
}
if (!isCallstackPopulated) { //IE and Safari
var currentFunction = arguments.callee.caller;
while (currentFunction) {
var fn = currentFunction.toString();
//If we can't get the function name set to "anonymous"
var fname = fn.substring(fn.indexOf("function") + 8, fn.indexOf("(")) || "anonymous";
callstack.push(fname);
currentFunction = currentFunction.caller;
}
}
output(callstack);
}
function output(arr) {
//Optput however you want
alert(arr.join("\n\n"));
}
</script>
</head>
<script type="text/javascript">
function foo() {
var blah;
bar("blah");
}
function bar(blah) {
var stuff;
thing();
}
function thing() {
if (true) { //your error condition here
printStackTrace();
}
}
foo();
</script>
</body>
</html>
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