我如何弄清楚Javascript在改变我的重点

Question

I am currently working on an ASP.Net project that has a large number of js files, most from third party sources. On a number of pages, the focus is being set to a control other than the one I'm setting it to in code-behind (Control.Focus()). How can I figure out how, why, and where the focus is being changed?

I have installed FireFocus for FireBug so I can see the focus being changed, but I cannot see the cause.

Answer 1

Using the link provided by Moby's Stunt Double, I added the following code to the bottom of my page and every time the focus was changed, the call stack was dumped to my console so I could trace the source.

<script type="text/javascript">
    $("#TabInformation").on("focus", function (event) {
        try { throw new Error("dummy"); } catch (e) { console.log(e.stack); }
    });
</script>