Q234 How can I trap errors?

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Q234 How can I trap errors?

In Netscape Navigator 3 and above its possible to trap errors with:

<SCRIPT LANGUAGE="JavaScript"><!--
function deal_with_error(msg, url, line) {
    alert('Message: ' + msg + '\n' + 'In file: ' + url + '\n' + 'At line: ' + line);
    return true;
}

self.onerror = deal_with_error;

// The next line causes a error:

alert(x);

//--></SCRIPT>

This does trap errors on Netscape Navigator 3 and above which supports the onerror event handler - although it is always best to try and anticipate the error *before* it happens and take appropriate action:

<SCRIPT LANGUAGE="JavaScript"><!--
if (window.x)
    alert(x);
else
    alert('x is not defined');
//--></SCRIPT>

Feedback on 'Q234 How can I trap errors?'

• 01:36:40 2/14/01 Thor Larholm