Question

I’m trying to debug an error message in a large and complicated frames based web/ASP.Net app using IE8 and Visual Studio 2010. Specifically, I am getting a “Member not found” message box which appears to be a straightforward JavaScript alert(). Unfortunately I don’t know where in the code the problem is happening, and fiddler2 wasn’t much help in this case.

My question is, can I get IE to break at the alert() call so that I can debug it?

Answer 1

String search for “Member not found”

Add 1 / 0; before the line.

Turn on break on all errors.

(I assumed you knew the developer tool existed. Hit F12 and navigate to the script tab)

Edit:

Thanks to @DmitriyNaumov

var aalert = window.alert;
window.alert = function() {
  aalert.apply(this, arguments);
  1 / 0;
}