250016 - JavaScript incorrect behaviour with OBJECT tag

Status: VERIFIED DUPLICATE of bug 250012

(Toolkit Graveyard :: Error Console, defect)

Description

[Vlad Alexander]

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7) Gecko/20040626 Firefox/0.9.1
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7) Gecko/20040626 Firefox/0.9.1

There seems to be no way using JavaScript to determine if the browser is using
the OBJECT tag or alternate content. For example, using this construct, if the
browser does not find the object clsid, a textarea is rendered:

<object classid="clsid:abc..." id="object1" width="100%" height="400">
     <textarea name="alternate1" id="alternate1" cols="60" rows="15"></textarea>
</object>

However, in Mozilla/FireFox, it is impossible to determine this
programmatically. In IE, the following script works but fails in Mozilla/FireFox.

if (document.getElementById('object1') && document.getElementById('object1') !=
null) {
     alert('object is rendered');
} else {
     alert('textarea is rendered');
}


Reproducible: Always
Steps to Reproduce:
1. create an <object> tag with an invalid clsid
2. use JavaScript to test the existence of this <object>. For example:
alert(document.getElementById('object1'));


Actual Results:  
JavaScript returns an instance of the object even if the object is not rendered.

Expected Results:  
JavaScript should return "null".

Comment 1

[Bill Mason]

*** This bug has been marked as a duplicate of 250012 ***