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We use window.onerror to catch unhandled exceptions (to log them for the dev team, and display a friendly user alert). Recently we noticed that in Google Chrome, the error message got truncated if it was above a certain length, and the text "...<omitted>..." was mysteriously added to the error message.
The code below will demonstrate this (in Chrome ver 33.0.1750). I was wondering if anyone else has had this problem?
<html>
<head>
<script type="text/javascript">
window.onerror = function (errorMsg, url, lineNumber) {
alert('Error: ' + errorMsg);
}
var throwError = function () {
throw new Error(
'Something went wrong. Something went wrong. Something went wrong. Something went wrong. ' +
'Something went wrong. Something went wrong. Something went wrong. Something went wrong. ' +
'Something went wrong. Something went wrong. Something went wrong. Something went wrong. ' +
'Some text gets truncated before this point!');
}
</script>
</head>
<body>
<h1>Hello World</h1>
<input type="button" onclick="throwError()" value="Throw uncaught error!" /><br /><br />
</body>
</html>
952
I found a solution that works well.
Chrome implements the new HTML standard, in which 2 new parameters have been added to the onerror handler, namely: the colNumber, and the error object (including stack trace).
See:
The full error message can be accessed through error.message as per my code sample below. This is a duplicate of the 1st parameter message, it seems like Chrome has decided to truncate message. Not sure why they had to break something that was working... :-(
IE and FireFox (as of my current versions: 11.0.9600 & 26.0) are not yet implementing the new 5-parameter standard, so the code makes allowance for that.
Hope this helps someone!
Code sample to return full error message:
<html>
<head>
<script type="text/javascript">
//Chrome passes the error object (5th param) which we must use since it now truncates the Msg (1st param).
window.onerror = function (errorMsg, url, lineNumber, columnNumber, errorObject) {
var errMsg;
//check the errorObject as IE and FF don't pass it through (yet)
if (errorObject && errorObject !== undefined) {
errMsg = errorObject.message;
}
else {
errMsg = errorMsg;
}
alert('Error: ' + errMsg);
}
var throwError = function () {
throw new Error(
'Something went wrong. Something went wrong. Something went wrong. Something went wrong. ' +
'Something went wrong. Something went wrong. Something went wrong. Something went wrong. ' +
'Something went wrong. Something went wrong. Something went wrong. Something went wrong. ' +
'Text does not get truncated! :-)');
}
</script>
</head>
<body>
<h1>Hello World</h1>
<input type="button" onclick="throwError()" value="Throw uncaught error!" /><br /><br />
</body>
This is a known problem in Chrome and has already been noticed by other people: https://github.com/angular/angular.js/issues/5568.
I don't think there is a workaround, but the bug is already reported: http://crbug.com/331971
3
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