Throwing errors in Javascript with error object re

Question

This is pretty much IE related because IE is the environment I'm using to test this, but I want to know if you can affect the relevancy of the error object properties when you throw an error. Consider the following javascript:

function MyClass (Arg1, Arg2)    // Line 5 of my.js
{
    if (typeof Arg1 != "string")
        throw new Error("Invalid argument passed for MyClass");
    // Do some other stuff here
}

Further down your code you have

var myvar = new MyClass(100, "Hello");    // Line 3201 of my.js

So the above would throw an error, but the error reported in the debugging information would show the error being thrown at line 9 of my.js instead of line 3201. Is this something you can change using standard methods?

Answer 1

What you are actually looking for is a stack trace for the error. There are no standards for this but most browsers do provide some means of discovery. Doing a quick search comes up with this js stack trace example.

Answer 2

In firefox you can use the stack property when you catch the error. In other browsers you can use the message property.

Have a look at this link on how to catch the stacktrace.