Question

I’m trying to generate a stacktrace in JavaScript. I have an implementation that works very well in Chrome, but there is an issue in Firefox: native Exceptions like DOMExceptions don’t have a .stack property.

<div id="test"></div>
<script type="text/javascript">
try {
    var range = document.createRange();
    range.setStart(document.getElementById("test"), -1); // throws Exception
} catch (e) {
    console.log(e.stack);
}
</script>

This will give Error: Index or size was negative, or greater than the allowed value.
at http://test/test.html:5:8 in Chrome.

But in Firefox I get undefined – sad fais 🙁

I know about Eriwen’s stacktrace script and stracktracejs and my implementation is inspired by it. I’ll consider using the caller.callee fallback but I’d rather not since I can’t get the file and line number.

Do you know a better solution?

---

I could wrap suspect calls in try-catch statements but I don’t know whether a call is suspect before I get the actual error and then I will fix the code so it will never throw again.

I could catch the Exception and rethrow as a new Error(e.message) but then I lose the stacktrace as well.

Answer 1

I tried e.location but this results in a known bug in Firefox. Error: Permission denied for <file://> to create wrapper for object of class UnnamedClass.

I can access e.filename and e.lineNumber. This is the solution I’m going with now.