internet explorer - 'Object Expected' Javascript error in IE8 when using prototype.js - Stack Overflow

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function icPageInit()
{
    $("icImgDiv" + icAlternate()).setOpacity(0);
    return true;
}
window.onload = icPageInit;

This piece of Javascript code works fine in Firefox and Chrome, but fails with the error 'Object Expected' in Internet Explorer 8. IE8 says the error occurs on line 3 of the above code.

Does anyone know why this is happening, and/or how to get it working?

function icPageInit()
{
    $("icImgDiv" + icAlternate()).setOpacity(0);
    return true;
}
window.onload = icPageInit;

This piece of Javascript code works fine in Firefox and Chrome, but fails with the error 'Object Expected' in Internet Explorer 8. IE8 says the error occurs on line 3 of the above code.

Does anyone know why this is happening, and/or how to get it working?

• javascript
• internet-explorer
• internet-explorer-8
• prototypejs
• object-expected

Share Improve this question Follow edited Dec 27, 2011 at 17:43 Rob W 349k8787 gold badges807807 silver badges682682 bronze badges asked Jun 4, 2009 at 9:17 user47322user47322 2

• Which version of Prototype? I believe the latest version has IE8 compatibility fixes. – karim79 Commented Jun 4, 2009 at 9:30
• You need the 1.6.1 release candidate for IE8 support - it was added in RC2, current is RC3. – robertc Commented Jun 26, 2009 at 23:17

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3 Answers 3

Sorted by: Reset to default 13

Figured it out.

Turns out Internet Explorer chokes if you use anything other than "javascript" in the language attribute of the script tag.

I was using version numbers appended onto javascript in the language attribute, which was causing IE not to load prototype.js.

Are you sure that this: $("icImgDiv" + icAlternate()) returns a reference to an element? If so, have you tried using Microsoft Script Debugger / Visual Studio to debug when and where the exception is raised?

Also check that the script tag's type is "text/javascript". I had this error in IE8, and fixed it by changing the type= part of the script tag from "application/javascript" to "text/javascript".

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