Bug 145869 – Select validation does not correctly work when handling change event

• Component: Forms
• Status: RESOLVED FIXED

Created attachment 254703 [details]
Test case

Expected behavior
Select a value->1 ... Should be changed to true, but remains false
1->Select a value ... Should be changed to false, but true

[Wenson Hsieh]

Created attachment 259434 [details]
Patch

[Dean Jackson]

Comment on attachment 259434 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=259434&action=review

> Source/WebCore/ChangeLog:14
> +        Test: fast/forms/onchange-select-check-validity.html
> +
> +        When selecting an option in a <select> with validation that also has an onchange listener, calling
> +        checkValidity() for the select within the onchange handler would produce incorrect results and (on
> +        a debug build) crash at an assertion. This is because the change events were being dispatched before
> +        form validity was updated. Making the validation step come before the change event dispatch fixes
> +        this issue.

Normally the Test line comes last.

> LayoutTests/fast/forms/onchange-select-check-validity.html:17
> +        select.onchange = showFormValidity;
> +        select.addEventListener("change", showFormValidity);

I think these two lines do the same thing. You only need one of them.

[Wenson Hsieh]

Comment on attachment 259434 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=259434&action=review

>> Source/WebCore/ChangeLog:14
>> +        this issue.
> 
> Normally the Test line comes last.

got it.

>> LayoutTests/fast/forms/onchange-select-check-validity.html:17
>> +        select.addEventListener("change", showFormValidity);
> 
> I think these two lines do the same thing. You only need one of them.

good catch. fixed!

[Ahmad Saleem]

Landed and didn't backed out - https://github.com/WebKit/WebKit/commit/dfc4f77e61d39a165b4d9c8edd877282bde90e84

Marking this as "RESOLVED FIXED".