Attribute-filter combined with :visible gives no results

[anonymous]

To validate a form, I used to loop through all visible input-fields having the attribute 'Required' set to 'true': $("input[Required='true']:visible")

After upgrading from jQuery 1.6.2 to 1.9.1, this stopped working. The code above doesn't return any results. When I change it to use a filter, I get the correct results again: $("input[Required='true']").filter(":visible")

Filtering on the type-attribute works fine, so I'm unsure what is causing this problem exactly.

[Maikel]

I created a jsFiddle-example: ​http://jsfiddle.net/9NHf2/1/

[anonymous]

I updated the example: ​http://jsfiddle.net/9NHf2/3

[gibson042]

This is an artifact of jQuery-specific attribute handling, as can be seen at ​http://jsfiddle.net/9NHf2/4/.

When testing HTML attributes, we check to see if the lowercased name matches a list of known booleans (attributes whose values are normalized to their names whenever they exist). "​required" is in the list, so the value gets normalized to "required", which obviously doesn't match "true". The input[Required='true'] filter doesn't have contain any jQuery extensions, and so uses the browser's native querySelectorAll when available—it also returns zero matches if you run it in IE7, for instance. In other words, this behavior is by design, but performance optimizations mean we don't catch all cases.

The good news is that you appear to be using attribute "Required" for the same purposes as boolean attribute "required", so I recommend that you switch to the latter if possible. Your other alternative would be to pick a non-boolean name and keep the "true" values.

Do either of these work for you?

[trac-o-bot]

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