Modern Event System: use focusin/focusout for onFocus/onBlur #19186
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See facebook/react#19186 for details on changes to `onFocus` and `onBlur`
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…lers in React >= 17 (#4920) * use focusin and focusout without capture if react >= 17 See facebook/react#19186 for details on changes to `onFocus` and `onBlur` * more accurate name for react version check const * add changeset * add comment about react >= 17 focus event listeners
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Switched focus and blur out for focusin and focusout due to unintended side effect. React appears to have switch to using it even though it fires a warning. facebook/react#19186
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Note: this PR requires changes in JSDOM, otherwise Jest tests fail. Everything passes when I make the JSDOM changes locally. This PR also includes #19221.
Before the changes in this PR, we mapped
onFocusandonBlurtofocusandblur, but we did so in the capture phase. Doing so in the capture phase enables us to listen to all events as if they bubbled, which works great when you listen on thedocument.With the modern event system, we no longer listen on the
documentfor events, but rather with listen to the React root (or portal) container element. This means that if we listen tofocusandblurin the capture phase, they actually occur in reverse order, which can lead to inconsistent UIs ifonFocusoronBlurare used likefocusinandfocusoutwork (which we have recommended users to do in the past).This PR alters how the modern event system handles
onFocusandonBlurso that they now usefocusinandfocusoutrather thanfocusandblur. This means we no longer need to listen to these events in the capture phase, ensuring consistentcy when usingonFocusandonBlurwith the expectation that bubbling order should correctly traverse through containers as expected.In terms of breaking changes, this change will mean that React will not support Firefox versions earlier than 52. Earlier versions do not support
focusinandfocusout.