Testcase: [4352]

Most likely caused by this optimization in init:

// Handle $(DOMElement)
if ( selector.nodeType ) {
	this[0] = selector;
	this.length = 1;
	return this;

Can't figure out how to fix it.

I added a patch which fixes the problem in IE, but this should probably be heavily tested with other selectors to make sure there are no unexpected side effects.

Fixed in [4436]. Thanks Scott for the patch.

Reverted 4436, didn't work.

I've added a new patch. This time I ran the test suite :-)

The idea is just to not use the optimization on forms (since that's what form.elements looks like in IE). I think the gained functionality outweighs the minor performance hit for $(document.forms![0]). This can also be tweaked to only prevent the optimization in IE.

The new patch doesn't work either (well, it works in so far as the constructor now behaves the same as the add method). Trying to create this patch, I found a related bug that exists in all browsers:

$([]).add(form) behaves the same as $([]).add(form.elements).

The problem appears to be that IE actually sticks the elements as array-like RIGHT IN THE FORM element. Then uses form.elements to link back to itself so

form.elements === form

Thus I'm not sure how to fix this since I can't see any way to tell which one the programmer passed in.

We've been able to fix this in the past ... with a very hacky mess which is probably why the fix isn't there anymore. As David mentioned form.elements === form in IE and there isn't a solid way to tell the difference.

A couple of workarounds:

$( $.makeArray(form.elements) );
$([]).add(form.elements);

Hi all,

$([]).add(form.elements) won't work in IE8, it just creates an jQuery Object with a length of 1 referring to form.elements.

That means, jQuery validate 1.6 with jQuery 1.6 may be broken in IE8 (always returns valid=true).

I had an issue where jquery.validate was failing in IE6, caused by the above error. I fixed this by updating line 446 and changed:

$([]).add(this.currentForm.elements).filter(":input")

to

$(':input',this.currentForm)

I managed to fix the issue by constructing myself the array used in the add() method:

var list = new Array();

for(var k=0;k<this.currentForm.elements.length;k++){

listeElements[k] = this.currentForm.elements[k];

}

$([]).add(listeElements).filter(":input")

Seems like the issue only appears in the add() method (currentForm.elements returns the form object), but it works fine when listing all elements in a loop.

$("form:input")

jquery.validate plagin uses this (even the latest 1.11). this way with additional array was the only way to make validation plagin works properly in IE10. thank you andros!