Bug 92029 - Radio buttons don't receive focus event
Summary: Radio buttons don't receive focus event
Status: UNCONFIRMED
Alias: None
Product: WebKit
Classification: Unclassified
Component: Forms (show other bugs)
Version: 528+ (Nightly build)
Hardware: PC Windows 7
: P2 Normal
Assignee: Nobody
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2012-07-23 14:23 PDT by Nicholas C. Zakas
Modified: 2012-07-24 11:00 PDT (History)
4 users (show)

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Description Nicholas C. Zakas 2012-07-23 14:23:58 PDT
When a radio button is clicked on or tabbed to, Internet Explorer and Firefox fire the focus event. In WebKit, this event is not fired. You can see this behavior very easily via:

<input type="radio" onfocus="alert('focus')">

This behavior is exhibited in the latest versions of both Safari and Chrome.
Comment 1 Kyle Simpson 2012-07-23 14:47:07 PDT
Just a few notes from a spec perspective, not to disclaim the validity of this bug:


Note that current spec can be a bit confusing on whether `focus` should be fired on the `input[type=radio]` element.

http://www.whatwg.org/specs/web-apps/current-work/multipage/common-input-element-attributes.html#common-event-behaviors

Defines only 2 "common events" across the form types, and `focus` is not one of them.

http://www.whatwg.org/specs/web-apps/current-work/multipage/states-of-the-type-attribute.html#radio-button-state-%28type=radio%29

Defines some exception events that do NOT apply to the `input[type=radio]` button, but `focus` is not listed as being excluded.

http://www.whatwg.org/specs/web-apps/current-work/multipage/editing.html#focus

And subsequent sections only talk about the `Focus` APIs on elements, and seem mum on the `focus` event itself.

But:

http://www.whatwg.org/specs/web-apps/current-work/multipage/webappapis.html#handler-onfocus

Lists `focus` as one of the events that should be on all HTML elements, other than `body`. So, it would appear (unless I missed something else) that finding no exclusion in the other sections, `focus` should indeed be fired.
Comment 2 Nicholas C. Zakas 2012-07-23 14:53:40 PDT
Potentially platform-specific. Updating to reflect that I'm on Windows 7.
Comment 3 Nicholas C. Zakas 2012-07-23 15:05:13 PDT
More info:

When I try to click on the radio button, I don't get the alert. When I tab to the radio button initially, I get the alert but I don't get it any time thereafter.
Comment 4 Kyle Simpson 2012-07-23 15:07:24 PDT
Nicholas: can you post a test page so others can check on other platforms, etc?
Comment 5 Jonathan Sampson 2012-07-23 15:09:20 PDT
(In reply to comment #4)
> Nicholas: can you post a test page so others can check on other platforms, etc?

Test available at http://jsfiddle.net/DM3h5/1/

I on Windows 7 and 8, with Chrome 20, I get consistent results with tabbing. The focus event is raised, and the alert is visible.

This is not the case with clicking on the input element. I never get the focus event that way.
Comment 6 Kyle Simpson 2012-07-23 15:19:05 PDT
I get the same behavior that Jonathan describes, on both Chrome 22 and Firefox 15 on Mac. However, Saf 5.1 never fires the event at all, although curiously, it doesn't appear that the radio button is even "focusable" (let alone not firing the event) via keyboard nav in Saf 5.1 on this Mac. I even tried modifying to set a `tabindex` and other such things, couldn't get Saf to give focus at all to the radio button. So perhaps in webkit, that's the deeper issue, that the element is simply not focusable.

Although, I would concur that it's strange that on the other browsers, keyboard focusing fires the event but mouse focusing does not. While that's bizarre, at least it seems a bit more consistent (this Saf unfocusable issue not-withstanding).
Comment 7 Alexey Proskuryakov 2012-07-24 09:46:39 PDT
I think that it's closely related like bug 22261 and its dupes. There is no focus given to the radio button when clicking, so there is no focus event dispatched.

> I even tried modifying to set a `tabindex` and other such things, couldn't get Saf to give focus at all to the radio button.

I can focus it via Option-clicking on Mac, and we probably dispatch the focus event in this case.
Comment 8 Kyle Simpson 2012-07-24 10:27:06 PDT
(in reply to Comment #7)

Option clicking for me on Mac (in Saf) doesn't do anything different than normal clicking. It selects the radio button, but the radio-button doesn't retain the focus (even if you take out the `this.blur()` in the test URL provided).

My primary evidence for suggesting the radio button never gets/keeps the focus is that after clicking (or option-clicking) the radio button (when it gets set to `checked`), you can't tab to other elements on the page, either before or after it, in a logical order. 

For instance, this variation on the previous test: http://jsfiddle.net/DM3h5/4/

If the radio button indeed can get the focus, then shift+tab should go to the text box before it, and tab should go to the text box after it. However, neither of those behaviors happen as expected in Saf (but they do in Chrome and Firefox).

Moreover, the focus event is indeed NOT fired, even if you option-click, even though the radio button receives the click enough to set the `checked` state.
Comment 9 Alexey Proskuryakov 2012-07-24 10:48:38 PDT
Apologies, I mistyped. It's not option-clicking, but option-tabbing.
Comment 10 Kyle Simpson 2012-07-24 10:55:59 PDT
(in reply to Comment #9)

I can confirm as well that option-tab is able to get the radio button to get focus (and fire the event) in Mac Saf 5.1.

Regular tab does not, nor does mouse clicking. Those seem like the bugs.

Moreover, it's clear that mouse-click also doesn't give focus in the other major browsers either, so this is a more widespread problem than just Safari Webkit.
Comment 11 Kyle Simpson 2012-07-24 11:00:16 PDT
FYI: here's a more well-behaving test for testing the option-click...

http://jsfiddle.net/DM3h5/6/

(note: must open web inspector to see console.log's, not using alert)