Bug 215461 – <input disabled> does not fire click events after dispatchEvent

• Component: DOM
• Status: RESOLVED FIXED

[Kagami Sascha Rosylight]

Created attachment 406533 [details]
onclick behavior test

Steps to reproduce the problem:
Try this:

```js
input = document.createElement("input");
input.disabled = true;
input.onclick = console.log
input.dispatchEvent(new MouseEvent("click"));
```

What is the expected behavior?
A click event should fire after a dispatchEvent call

What went wrong?
It never fires on a disabled input element.

Did this work before? N/A 

Does this work in other browsers? Yes, in Firefox

It must fire onclick per the spec. Related discussion: https://github.com/whatwg/html/pull/5805#issuecomment-672960163

[Radar WebKit Bug Importer]

<rdar://problem/67030950>

[Chris Dumez]

Created attachment 413195 [details]
WIP Patch

[Domenic Denicola]

Hey, just looking at the patch, it doesn't seem to match the intention of the spec. The idea is that if the *user* clicks one of these, then it's disabled and the event isn't delivered:

> A form control that is disabled must prevent any click events that are queued on the user interaction task source from being dispatched on the element.

Similarly, click() doesn't go through on disabled elements:

> If this element is a form control that is disabled, then return.

But any dispatchEvent(new MouseEvent("click")) should always fire "click" handlers. That's just part of general DOM event dispatch, and not related to checkboxes or radio buttons specifically, or to disabledness.

Hope this helps!

[Chris Dumez]

(In reply to Domenic Denicola from comment #3)
> Hey, just looking at the patch, it doesn't seem to match the intention of
> the spec. The idea is that if the *user* clicks one of these, then it's
> disabled and the event isn't delivered:
> 
> > A form control that is disabled must prevent any click events that are queued on the user interaction task source from being dispatched on the element.
> 
> Similarly, click() doesn't go through on disabled elements:
> 
> > If this element is a form control that is disabled, then return.
> 
> But any dispatchEvent(new MouseEvent("click")) should always fire "click"
> handlers. That's just part of general DOM event dispatch, and not related to
> checkboxes or radio buttons specifically, or to disabledness.
> 
> Hope this helps!

It is not clear to me that the patch does not match what you're saying. I guess I need to add more tests to confirm.

[Chris Dumez]

Created attachment 413203 [details]
WIP Patch

[Chris Dumez]

(In reply to Chris Dumez from comment #4)
> (In reply to Domenic Denicola from comment #3)
> > Hey, just looking at the patch, it doesn't seem to match the intention of
> > the spec. The idea is that if the *user* clicks one of these, then it's
> > disabled and the event isn't delivered:
> > 
> > > A form control that is disabled must prevent any click events that are queued on the user interaction task source from being dispatched on the element.
> > 
> > Similarly, click() doesn't go through on disabled elements:
> > 
> > > If this element is a form control that is disabled, then return.
> > 
> > But any dispatchEvent(new MouseEvent("click")) should always fire "click"
> > handlers. That's just part of general DOM event dispatch, and not related to
> > checkboxes or radio buttons specifically, or to disabledness.
> > 
> > Hope this helps!
> 
> It is not clear to me that the patch does not match what you're saying. I
> guess I need to add more tests to confirm.

I added more tests based on your comments and they all seem to pass. Please let me know if I missed something.

[Domenic Denicola]

The case I was thinking of was that .dispatchEvent() should also work on disabled text inputs or textareas or selects.

My reading of the current patch is that it disallows click events on all disabled inputs, unless it's a checkbox or radio button. It doesn't seem to (from my uninformed skimming) differentiate between dispatchEvent(), click(), and user clicks.

Whereas, the spec differentiates between those three categories. But does not differentiate between checkbox/radio, and any other elements.

[Chris Dumez]

Created attachment 413218 [details]
WIP Patch

[Chris Dumez]

Created attachment 413219 [details]
WIP Patch

[Chris Dumez]

Created attachment 413220 [details]
WIP Patch

[Chris Dumez]

Created attachment 413306 [details]
Patch

[EWS]

Committed r269452: <https://trac.webkit.org/changeset/269452>

All reviewed patches have been landed. Closing bug and clearing flags on attachment 413306 [details].