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feat!: add
indeterminate prop to <Checkbox> that's separate from `c…
…hecked` https://html.spec.whatwg.org/multipage/input.html#checkbox-state-(type=checkbox) considers indeterminate to be a separate thing from a checkbox's checked state. In fact, it calls out that "The indeterminate IDL attribute only gives the appearance of a third state." Basically you can end up with all 4 combinatinos of checked and indeterminate, although visually there are only 3 states (both indeterminate states look the same). We can also see clearly at https://codepen.io/ahuth/pen/MWqmwyv that browsers behave this way.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,29 @@ | ||
| import { render, screen } from '@testing-library/react'; | ||
| import React from 'react'; | ||
| import { CheckboxInput } from './CheckboxInput'; | ||
|
|
||
| it('forwards refs', () => { | ||
| const someRef = React.createRef<HTMLInputElement>(); | ||
| render(<CheckboxInput id="test" ref={someRef} />); | ||
| expect(someRef.current).toBeInstanceOf(HTMLInputElement); | ||
| }); | ||
|
|
||
| describe('indeterminancy', () => { | ||
| it('is indeterminate when "indeterminate" is true', () => { | ||
| render(<CheckboxInput id="test" indeterminate />); | ||
| const checkbox = screen.getByRole<HTMLInputElement>('checkbox'); | ||
| expect(checkbox.indeterminate).toEqual(true); | ||
| }); | ||
|
|
||
| it('is not indeterminate when "indeterminate" is false', () => { | ||
| render(<CheckboxInput id="test" indeterminate={false} />); | ||
| const checkbox = screen.getByRole<HTMLInputElement>('checkbox'); | ||
| expect(checkbox.indeterminate).toEqual(false); | ||
| }); | ||
|
|
||
| it('is not indeterminate when "indeterminate" is not present', () => { | ||
| render(<CheckboxInput id="test" />); | ||
| const checkbox = screen.getByRole<HTMLInputElement>('checkbox'); | ||
| expect(checkbox.indeterminate).toEqual(false); | ||
| }); | ||
| }); |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,59 @@ | ||
| import { render, screen } from '@testing-library/react'; | ||
| import React from 'react'; | ||
| import useForwardedRef from './useForwardedRef'; | ||
|
|
||
| type Props = { | ||
| callbackWithRef?: (ref: React.RefObject<HTMLElement>) => void; | ||
| }; | ||
|
|
||
| /** | ||
| * Component for testing our forwarded ref. | ||
| */ | ||
| const TestComponent = React.forwardRef<HTMLButtonElement, Props>( | ||
| ({ callbackWithRef }, ref) => { | ||
| // Access the forwarded ref. | ||
| const anotherRef = useForwardedRef(ref); | ||
|
|
||
| // If present, pass the forwarded ref to a callback so we can do things with it in our tests. | ||
| React.useEffect(() => { | ||
| if (callbackWithRef) { | ||
| callbackWithRef(anotherRef); | ||
| } | ||
| }, [anotherRef, callbackWithRef]); | ||
|
|
||
| return <button ref={anotherRef}>☕</button>; | ||
| }, | ||
| ); | ||
|
|
||
| it('allows refs to be forwarded', () => { | ||
| const someRef = React.createRef<HTMLButtonElement>(); | ||
| render(<TestComponent ref={someRef} />); | ||
| expect(screen.getByRole('button')).toBeInTheDocument(); | ||
| expect(someRef.current).toBeInstanceOf(HTMLButtonElement); | ||
| }); | ||
|
|
||
| it('does not require a ref', () => { | ||
| render(<TestComponent />); | ||
| expect(screen.getByRole('button')).toBeInTheDocument(); | ||
| }); | ||
|
|
||
| it('allows forward refs to be intercepted and used by the component', () => { | ||
| const someRef = React.createRef<HTMLButtonElement>(); | ||
|
|
||
| render( | ||
| <TestComponent | ||
| // We've exposed the ref outside of the compnent via a callback for testing purposes. | ||
| // Normally the component will do things with the ref internally. | ||
| callbackWithRef={(ref) => { | ||
| // Add a data attribute we can write assertions against. | ||
| if (ref.current) { | ||
| ref.current.dataset.coffee = '5'; | ||
| } | ||
| }} | ||
| ref={someRef} | ||
| />, | ||
| ); | ||
|
|
||
| expect(someRef.current?.dataset.coffee).toEqual('5'); | ||
| expect(screen.getByRole('button').dataset.coffee).toEqual('5'); | ||
| }); |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,21 @@ | ||
| import { useRef, useEffect, type ForwardedRef, type RefObject } from 'react'; | ||
|
|
||
| /** | ||
| * Safely access a forwarded ref, which may or may not be present. | ||
| */ | ||
| export default function useForwardedRef<T>(ref: ForwardedRef<T>): RefObject<T> { | ||
| const innerRef = useRef<T>(null); | ||
|
|
||
| // Keep the internal and forwarded refs in sync. | ||
| useEffect(() => { | ||
| if (!ref) { | ||
| return; | ||
| } else if (typeof ref === 'function') { | ||
| ref(innerRef.current); | ||
| } else { | ||
| ref.current = innerRef.current; | ||
| } | ||
| }, [ref]); | ||
|
|
||
| return innerRef; | ||
| } |