Question

Is there a way to get an automatic feedback if an error (even syntax errors) occurs when running a JavaScript on the client side?

I was thinking of something like this:

<script src='debugger.js'></script> <script>     // some script with an error in it </script> 

And every time the debugger notices an error it sends a feedback to the server.

Answer 1

EDIT: I misunderstood your question initially, this should work:

Also note, this needs to go BEFORE any javascript that might cause errors.

window.onerror = function(msg,u,l) {     txt ='Error: ' + msg + '\n';     txt+='URL: ' + u + '\n';     txt+='Line: ' + l + '\n\n';     //Insert AJAX call that passes data (txt) to server-side script     return true; }; 

As for syntax errors, you’re out of luck. Javascript simply dies when there’s a syntax error. There’s no way to handle it at all.