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Is there any way to catch Javascript errors globally across the web application by writing some code in the master page?

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You can use the onerror event:

var oldOnError = window.onerror;
window.onerror = function()
{
    alert('Something bad happened');

    //Optionally...
    oldOnError();
}
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I have just released code to help log JavaScript errors by sending error information to the server - thecodepage.com/post/JavaScript-Error-Notifications.aspx
Do you possibly know why this simple demo - jsfiddle.net/YM9U7 - works in IE9 beta and Firefox 3.6, but doesn't work in Chrome, Safari and Opera? (By "works" I mean, the "Error!" alert is displayed.)
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See JavaScript Exception Handling Techniques

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