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POCryptic "Script Error." reported in Javascript in Chrome and Firefox
 

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  1. POCryptic "Script Error." reported in Javascript in Chrome and Firefox
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    <p>I have a script that detects Javascript errors on my website and sends them to my backend for reporting. It reports the first error encountered, the supposed line number, and the time.</p> <p><strong>EDIT to include doctype:</strong></p> <pre><code>&lt;!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"&gt; &lt;html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en" xmlns:fb="http://www.facebook.com/2008/fbml"&gt; </code></pre> <p><strong>...</strong></p> <pre><code>&lt;script type="text/javascript"&gt; //&lt;![CDATA[ // for debugging javascript! (function(window){ window.onerror = function(msg, url, ln) { //transform errors if (typeof(msg) === 'object' &amp;&amp; msg.srcElement &amp;&amp; msg.target) { if(msg.srcElement == '[object HTMLScriptElement]' &amp;&amp; msg.target == '[object HTMLScriptElement]'){ msg = 'Error loading script'; }else{ msg = 'Event Error - target:' + msg.target + ' srcElement:' + msg.srcElement; } } msg = msg.toString(); //ignore errors if(msg.indexOf("Location.toString") &gt; -1){ return; } if(msg.indexOf("Error loading script") &gt; -1){ return; } //report errors window.onerror = function(){}; (new Image()).src = "/jserror.php?msg=" + encodeURIComponent(msg) + "&amp;url=" + encodeURIComponent(url || document.location.toString().replace(/#.*$/, "")) + "&amp;ln=" + parseInt(ln || 0) + "&amp;r=" + (+new Date()); }; })(window); //]]&gt; &lt;/script&gt; </code></pre> <p>Because of this script, I'm acutely aware of any javascript errors that are happening on my site. <strong>One of by biggest offenders is "Script Error." on line 0.</strong> in Chrome 10+, and Firefox 3+. This error doesn't exist (or may be called something else?) in Internet Explorer.</p> <p><strong>Correction (5/23/2013):</strong> This "Script Error, Line 0" error is now showing up in IE7 and possibly other versions of IE. Possibly a result of a recent IE security patch as this behavior previously did not exist.</p> <p>Does anyone have any idea what this error means or what causes it? It happens on about 0.25% of my overall pageloads, and represents half the reported errors.</p>
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    1. USMike Sherov
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    1. COWhat is your doctype? If you're not declaring an XHTML doctype, then you don't need CDATA, which could be why there are script errors.
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    2. COI appreciate the help... Added the doctype: XHTML. Also, though, only happening on 0.25% of pageloads... I would think it's something more exotic.
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      1. POCryptic "Script Error." reported in Javascript in Chrome and Firefox
      1. USMike Sherov
    3. CO@jayp: Just mentioning. XHTML doctype is still HTML parser. You have to sent content as `application/xhtml+xml` to run it in XHTML parser (like XHTML specification says). There is whole a lot of content which claims to be XHTML, but sends normal HTML doctype. Because of how incorrectly content creators use XHTML, browsers decided to only use XML parser on `application/xhtml+xml` (it's really strict parser). The http://hixie.ch/advocacy/xhtml and http://www.webdevout.net/articles/beware-of-xhtml says why not use HTML parser with XHTML.
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      1. USKonrad Borowski
 

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