Fix "An input component must either have a 'aria-label' attribute..." error when a <label> is present

[tjosepo]

Issue: #1229

Summary

Removes the warning "An input component must either have a 'aria-label' attribute..." when a <label> is present.

What I did

I moved the validation logic inside a useEffect and add a check for isNilOrEmpty(input.labels).

I had to modify isNilOrEmpty to support arrays (and NodeList). Instead of checking value === "", it checks value.length === 0 (this works for strings, arrays and NodeLists).

How to test

Unit tests were added.

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| Name | Type | | -------------------- | ----- | | @orbit-ui/components | Patch | | @sharegate/orbit-ui | Patch |

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[patricklafrance]

I am not sure I understand the use case correctly.

Does the following code would print a warning?

    <Field required>
        <Label>Username</Label>
        <TextInput placeholder="john@spacex.com" />
    </Field>

When there's a Field and a Label, the label id should be retrieved from the FieldContext by the following code of the Input component:

const [fieldProps] = useFieldInputProps();

fieldProps would then add to the Input props the aria-describedby and aria-labelledby properties, which should prevent the warning from being displayed.

From what I can see by the following test, the issue might be that the Input and the Label are not wrapped within a Field component.

[tjosepo]

Does the following code would print a warning?

✅ I confirm that using <Field> worked without printing a warning.

I'll add it to the test scenarios.

---

I didn't know the <Field> component automatically added the accessibility properties.

To me, it still feel like a bug because using a label with htmlFor is accessible HTML, yet Orbit logs an error.

<>
    <Label htmlFor="test">Label</Label>
    <TextInput id="test" />
</>

I understand that labels are this is not as easily verifyable as using aria-label, aria-labelledby, and placeholder, since this forces us to move the validation logic after the component has been rendered on the page. This prevents us from checking accessibility during SSR. Altough, it is just as unit-testable.

I think it's a valid trade-off.

We can also argue against this change if we prefer people to use the <Field> component instead of manually passing in a label with htmlFor. In this case, we should update the warning message to mention using the <Field> component.

[patricklafrance]

Thank for the reply @tjosepo. Yes, the intent is to always use the <Field> component to group together a Label and an Input. Great idea to update the warning message!

[tjosepo]

Alright! I'll update my PR and go for it.