Is it possible to programatically catch JavaScript SyntaxErrors?
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by Matty
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Published on 2010-03-26T19:27:37Z
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2010/03/26
19:43 UTC
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I don't think that this is doable, but wanted to throw it out to the community to confirm my suspicions.
Let's say you're writing a program in another language like Python, PHP, or ASP. This program is intended to build another program written in JavaScript. However, the first program is unfortunately not immune to errors. So, occasionally, the program which builds the JavaScript program does some funky stuff and outputs a syntax error in the JavaScript source. Now some user goes and loads the program and it essentially halts, because the web browser running it can't properly parse the JavaScript. This user is probably not going to be happy. I wouldn't be.
This brings me to my question. Is it possible to write an error handler that would catch these kind of syntax problems allowing the application to fail gracefully?
Here's an example:
<html>
<head>
<script type="text/javascript" charset="utf-8">
window.onerror = errorHandler;
function errorHandler(a,b,c) {
alert('horray! No wait, Booo!');
}
vara jfs;
</script>
</head>
<body>
Can this be done?
</body>
</html>
or
<html>
<head>
<script type="text/javascript" charset="utf-8">
try {
vara jfs;
} catch (e) {
alert('horray! No wait, Booo!');
}
</script>
</head>
<body>
Can this be done?
</body>
</html>
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