Modern Event System: make on*Capture events use capture phase #19221
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gaearon
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Jul 6, 2020
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@gaearon What Map access were you referencing specifically? I was also of the understanding that the difference was tiny, especially when the inline cache is utilized. I remember this being a perf issue a few years back with V8, but Sets and Maps are really fast now. |
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This was referenced Mar 15, 2021
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This was referenced Oct 1, 2024
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Note: this PR is rebased on #19244.
This PR alters the modern event system so that events that are of the format
on*Capture(capture events) are actually put into the browser's native capture event phase when React creates the event listener. This is a deparature of the previous logic, which "virtualized" the capture and bubble phases within the native bubble event listener.This is an important change to the modern event system, as the modern event system delegates to React roots (or portals) rather than the
document. This means events that are setup to be capture listener, i.e.onClickCapturenow correctly behave has expected. This also fixes some long-standing issues with how React and the browser differ in regards to how events are handled in co-ordination with native event listeners.Lastly, we still (for now) enforce
blurandfocusto be capture phase listeners (so they emulate two phase propagation in the native capture phase, as we did before). We also emulate two phase propagation in the native bubble phase, as we did before, for theChangeEventPlugin,BeforeInputEventPluginandSelectEventPluginevent plugins.