- From: Ms2ger <ms2ger@gmail.com>
- Date: Wed, 07 Aug 2013 16:04:09 +0200
- To: Jungkee Song <jungkee.song@samsung.com>
- CC: public-webapps-testsuite@w3.org
Hi Jungkee,
On 08/06/2013 03:31 PM, Jungkee Song wrote:
> Hi,
>
> In the following approved TC, I found an assertion that needs review:
> http://w3c-test.org/html/tests/approved/the-elements-of-html/forms/the-form-
> element/form-elements-matches.html
>
> var form = document.getElementById("form");
> var i = document.createElement("input");
> i.name = "2";
> form.appendChild(i);
>
> assert_equals(form.elements["2"], undefined, '["2"]');
>
> Shouldn't the above assertion rather be:
> assert_equals(form.elements["2"], i, '["2"]');
>
> See the definition of HTMLCollection:
> http://dom.spec.whatwg.org/#interface-htmlcollection
I believe this test to be correct. However, it relies on the
little-known fact that all property names in JS are strings, and foo[2]
is just a shorthand for foo["2"]. The distinction made is not between
strings and numbers (what would you do with objects?) but instead looks
at the subset of strings that are "array index property name"s [*].
This all means that form.elements["2"] calls into the indexed getter
[§], and there is no element with index 2.
HTH
Ms2ger
[*] http://dev.w3.org/2006/webapi/WebIDL/#dfn-array-index-property-name
[§] http://dom.spec.whatwg.org/#dom-htmlcollection-item
Received on Wednesday, 7 August 2013 14:04:39 UTC