Alert Javascript Errors when javascript fails?

Question

When I have a fatal error in javascript making the app not usable, like this one:

SyntaxError: Unexpected token '}'

Is it possible to catch it and display it somehow? like replacing the body or alerting?

So in other words, a way to run javascript code if there is a javascript code error...

I can't open the web inspector on runtime when I'm inside a crashed page, this is because I'm using webkit outside of a browser who would normally be able to open and display the webinspector on a crashed page.

raina77ow · Accepted Answer · 2013-09-29 22:28:57Z

5

Define window.onerror callback in the very first <script> loaded on the page, like this:

<script>
window.onerror = function(msg, url, line) {
    alert(msg + ' appeared on the line #' + line);
}
</script>

answered Sep 29, 2013 at 22:28

raina77ow

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1 Comment

Vincent Duprez Over a year ago

I love it when there are such easy to implement solutions, saves me hours. thanks a lot, I can now redirect errors to a native error handler. Don't really understand why document is able to perform a callback on crashed pages while no other valid object is able to run... but at least it works...

Kasper Sanguesa-Franz · Accepted Answer · 2013-09-29 22:26:05Z

0

You can use

try{
    adddlert("Welcome guest!");
}catch(err){
    alert(err.message);
}

answered Sep 29, 2013 at 22:26

Kasper Sanguesa-Franz

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2 Comments

Vincent Duprez Over a year ago

I'll try the whole webapp (2k lines) inside the try handler.. not sure if runtime errors will be catched this way...

Felix Kling Over a year ago

The OP's example is a syntax error though, not a runtime error.

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