OK, I didn't think this would be such an amazing concept, but apparently someone did. JavaScript actually allows you to override the default alert() behaviour; you can use this to display a fancy dialog in place of the standard modal alerts, or just alter the alert:
<script type="text/javascript">
// <![CDATA[
var originalAlert = window.alert;
window.alert = function(msg) {
originalAlert('Altered Message: ' + msg);
}
// ]]>
</script>
Furthermore, you can apply the same principal to override the error behaviour:
window.onerror = function() {
alert('An error occured');
}
The result of an error on the page is a popup "Altered Message: An error occurred".
You can test this out by adding another function and method
function throwError(e) {throw 'Exception';
}
<input type="button" value="Click Me" onclick="throwError();" />
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