fix(material/input): do not override existing aria-describedby value #19587
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mmalerba
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| * Value of `aria-describedby` that should be merged with the described-by ids | ||
| * which are set by the form-field. | ||
| */ | ||
| readonly userAriaDescribedBy?: string; |
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can we add a bit about this to the docs?
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yeah, that's fair. Added it to the guide and updated our custom control example.
mmalerba
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| This method is used by the `<mat-form-field>` to specify the IDs that should be used for the | ||
| `aria-describedby` attribute of your component. The method has one parameter, the list of IDs, we | ||
| just need to apply the given IDs to our host element. | ||
| This method is used by the `<mat-form-field>` to set element ids that should be used for the |
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Nice, I think this makes it a lot more clear why both properties exist / what they're for
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@devversion can you rebase when you get a chance? |
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@jelbourn Done |
The form-field notifies controls whenever hints or errors have been displayed. It does this, so that controls like the input can refresh their `aria-describedby` value to point to the errors and hints. This currently has the downside of overriding existing `aria-describedby` values that have been manually set by developers. We could fix this by reading the initial value and merging it with the ids received from the form-field.
… value Address feedback
… value Add documentation
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This is green now and rebased again. |
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The form-field notifies controls whenever hints or errors have
been displayed. It does this, so that controls like the input
can refresh their
aria-describedbyvalue to point to the errorsand hints.
This currently has the downside of overriding existing
aria-describedbyvalues that have been manually set bydevelopers. We could fix this by reading the initial value
and merging it with the ids received from the form-field.
Fixes #19528