Bug Tracker

Opened 14 years ago

Closed 14 years ago

Last modified 10 years ago

#750 closed bug (wontfix)

jQuery( 'param', $( 'object' )[0] ); fails if an OBJECT element exists

Reported by: Andrea Ercolino Owned by:
Priority: minor Milestone: 1.1.2
Component: core Version: 1.1.1
Keywords: constructor Cc:
Blocked by: Blocking:

Description (last modified by john)

Cause: getElementsByTagName( 'object' ) returns an array of functions, but jQuery() does not take care of it


  // If so, execute it in context
 - if ( fn && typeof fn == "function" )
 + if ( fn && typeof fn == "function" && fn.nodeType == undefined )

Change History (13)

comment:1 Changed 14 years ago by joern

I can confirm this, though the problem lies now somewhere else. The quoted code was removed from jQuery(), but the problem is still there. I added a few assertions to show it.

comment:2 Changed 14 years ago by andrea

I've tried the fix I suggested, and it worked.

It seems that it's a JavaScript issue (it's what Firebug shows, and in IE the problem is there too): getElementsByTagName( 'object' ) returns an array of functions. They are not functions, they are just DOM elements with a function type instead of an object type. All the OBJECT's properties are there, and I couldn't find more differences except the type.

comment:3 Changed 14 years ago by joern

Resolution: fixed
Status: newclosed

Actually my test was wrong, it works fine with the latest revision.

The code you quote doesn't exist anymore in jQuery, therefore can't cause any more harm.

comment:4 Changed 14 years ago by joern

Resolution: fixed
Status: closedreopened

Works for FF, but still fails in IE.

comment:5 Changed 14 years ago by joern

Resolution: fixed
Status: reopenedclosed


comment:6 Changed 14 years ago by andrea

Resolution: fixed
Status: closedreopened

OBJECT.getElementsByTagName("*") and OBJECT.all return no elements

This is the IE7 bug this one is related to. I've posted a long message with details and a fix in the dev list.

comment:7 Changed 14 years ago by john

Resolution: fixed
Status: reopenedclosed
Version: 1.1a

Fixed in SVN rev 994. I just added a check enforcing all "*" searches to be converted into "param". This isn't fully optimal, but at least its consistent cross-platform now.

comment:8 Changed 14 years ago by andrea

Will it fail on a markup like this ? (http://www.w3.org/TR/html401/struct/objects.html)

<P>                 <!-- First, try the Python applet -->
<OBJECT title="The Earth as seen from space" 
                    <!-- Else, try the MPEG video -->
  <OBJECT data="TheEarth.mpeg" type="application/mpeg">
                    <!-- Else, try the GIF image -->
    <OBJECT data="TheEarth.gif" type="image/gif">
                    <!-- Else render the text -->
     The <STRONG>Earth</STRONG> as seen from space.

comment:9 Changed 14 years ago by andrea

Resolution: fixed
Status: closedreopened

I've retouched my fix, following John's style. It's just 89 packed bytes fatter, and should work fine with the above 'official' example.

jQuery.getElementsByTagName declaration:

getElementsByTagName: function( e, t, rec ) {
	t = t.toUpperCase();
	if( rec !== false ) rec = true;
	var r = [];
	for ( var c = e.firstChild; c; c = c.nextSibling ) {
		if ( c.nodeType == 1 && ( c.nodeName == t || t == "*" ) )
			r.push( c );
		if( rec ) 
			r = r.concat( jQuery.getElementsByTagName( c, t ) );
	return r;

First refactored chunk (children):

// Perform our own iteration and filter
for ( var i = 0, rl = ret.length; i < rl; i++ )
	r = r.concat( jQuery.getElementsByTagName( ret[i], m[1], false ) );

Second refactored chunk (descendants):

// Grab the tag name being searched for
var tag = m[1] != "" || m[0] == "" ? "*" : m[2];
// We need to find all descendant elements, it is more
// efficient to use getAll() when we are already further down
// the tree - we try to recognize that here
for ( var i = 0, rl = ret.length; i < rl; i++ )
	jQuery.merge( r,
		m[1] != "" && ret.length != 1 ?
			jQuery.getAll( ret[i], [], m[1], m[2], rec ) :
		// Handle IE7 being really dumb about <object>s
		ret[i].nodeName.toUpperCase() == "OBJECT" && tag == "*" ?
			jQuery.getElementsByTagName( ret[i], tag ) :
			ret[i].getElementsByTagName( tag )

comment:10 Changed 14 years ago by john

Milestone: 1.1a
Priority: majorminor
Version: 1.1a

No, it won't fail on that markup, since you could do: $("object").find("object, strong")

Honestly, if you can show me a public web site that puts anything besides params inside of an object, I'll be more included to fix this. As it stands, you're still able to select descendant elements by type - and able to select all params using "*".

The biggest issue that I have with this fix is that it will significantly degrade the performance of select-by-tag queries.

comment:11 Changed 14 years ago by andrea

You mean performance degradation strictly limited to selections that resolve to a call to OBJECT.getElementsByTagName("*")...

comment:13 Changed 14 years ago by john

Description: modified (diff)
Milestone: 1.1.2
Resolution: wontfix
Status: reopenedclosed
Version: 1.1.1

Ok, I'm moving this to being resolved - the current fix seems to solve the most-pressing issues related to this bug, without sacrificing any speed, or adding a significant amount of code.

I've also contacted the IE team - so they are aware of the issue, and are working to resolve it.

comment:15 Changed 10 years ago by Rick Waldron

#7553 is a duplicate of this ticket.

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