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mgolgibson042
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Event: Simulate focus/blur in IE via focusin/focusout
In IE (all versions), `focus` & `blur` handlers are fired asynchronously but `focusin` & `focusout` are run synchronously. In other browsers, all those handlers are fired synchronously. Asynchronous behavior of these handlers in IE caused issues for IE (gh-4856, gh-4859). We now simulate `focus` via `focusin` & `blur` via `focusout` in IE to avoid these issues. This also let us simplify some tests. This commit also simplifies `leverageNative` - with IE now using `focusin` to simulate `focus` and `focusout` to simulate `blur`, we don't have to deal with async events in `leverageNative`. This also fixes broken `focus` triggers after first triggering it on a hidden element - previously, `leverageNative` assumed that the native `focus` handler not firing after calling the native `focus` method meant it would be handled later, asynchronously, which was not the case (gh-4950). Fixes gh-4856 Fixes gh-4859 Fixes gh-4950 Closes gh-5223 Co-authored-by: Richard Gibson <richard.gibson@gmail.com>
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‎src/event.js‎

Lines changed: 56 additions & 46 deletions
Original file line numberDiff line numberDiff line change
@@ -1,9 +1,9 @@
11
import jQuery from "./core.js";
2-
import document from "./var/document.js";
32
import documentElement from "./var/documentElement.js";
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import rnothtmlwhite from "./var/rnothtmlwhite.js";
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import rcheckableType from "./var/rcheckableType.js";
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import slice from "./var/slice.js";
6+
import isIE from "./var/isIE.js";
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import acceptData from "./data/var/acceptData.js";
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import dataPriv from "./data/var/dataPriv.js";
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import nodeName from "./core/nodeName.js";
@@ -21,16 +21,6 @@ function returnFalse() {
2121
return false;
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}
2323

24-
// Support: IE <=9 - 11+
25-
// focus() and blur() are asynchronous, except when they are no-op.
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// So expect focus to be synchronous when the element is already active,
27-
// and blur to be synchronous when the element is not already active.
28-
// (focus and blur are always synchronous in other supported browsers,
29-
// this just defines when we can count on it).
30-
function expectSync( elem, type ) {
31-
return ( elem === document.activeElement ) === ( type === "focus" );
32-
}
33-
3424
function on( elem, types, selector, data, fn, one ) {
3525
var origFn, type;
3626

@@ -459,7 +449,7 @@ jQuery.event = {
459449
el.click && nodeName( el, "input" ) ) {
460450

461451
// dataPriv.set( el, "click", ... )
462-
leverageNative( el, "click", returnTrue );
452+
leverageNative( el, "click", true );
463453
}
464454

465455
// Return false to allow normal processing in the caller
@@ -511,10 +501,10 @@ jQuery.event = {
511501
// synthetic events by interrupting progress until reinvoked in response to
512502
// *native* events that it fires directly, ensuring that state changes have
513503
// already occurred before other listeners are invoked.
514-
function leverageNative( el, type, expectSync ) {
504+
function leverageNative( el, type, isSetup ) {
515505

516-
// Missing expectSync indicates a trigger call, which must force setup through jQuery.event.add
517-
if ( !expectSync ) {
506+
// Missing `isSetup` indicates a trigger call, which must force setup through jQuery.event.add
507+
if ( !isSetup ) {
518508
if ( dataPriv.get( el, type ) === undefined ) {
519509
jQuery.event.add( el, type, returnTrue );
520510
}
@@ -526,15 +516,13 @@ function leverageNative( el, type, expectSync ) {
526516
jQuery.event.add( el, type, {
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namespace: false,
528518
handler: function( event ) {
529-
var notAsync, result,
519+
var result,
530520
saved = dataPriv.get( this, type );
531521

532522
if ( ( event.isTrigger & 1 ) && this[ type ] ) {
533523

534524
// Interrupt processing of the outer synthetic .trigger()ed event
535-
// Saved data should be false in such cases, but might be a leftover capture object
536-
// from an async native handler (gh-4350)
537-
if ( !saved.length ) {
525+
if ( !saved ) {
538526

539527
// Store arguments for use when handling the inner native event
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// There will always be at least one argument (an event object), so this array
@@ -543,28 +531,17 @@ function leverageNative( el, type, expectSync ) {
543531
dataPriv.set( this, type, saved );
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545533
// Trigger the native event and capture its result
546-
// Support: IE <=9 - 11+
547-
// focus() and blur() are asynchronous
548-
notAsync = expectSync( this, type );
549534
this[ type ]();
550535
result = dataPriv.get( this, type );
551-
if ( saved !== result || notAsync ) {
552-
dataPriv.set( this, type, false );
553-
} else {
554-
result = {};
555-
}
536+
dataPriv.set( this, type, false );
537+
556538
if ( saved !== result ) {
557539

558540
// Cancel the outer synthetic event
559541
event.stopImmediatePropagation();
560542
event.preventDefault();
561543

562-
// Support: Chrome 86+
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// In Chrome, if an element having a focusout handler is blurred by
564-
// clicking outside of it, it invokes the handler synchronously. If
565-
// that handler calls `.remove()` on the element, the data is cleared,
566-
// leaving `result` undefined. We need to guard against this.
567-
return result && result.value;
544+
return result;
568545
}
569546

570547
// If this is an inner synthetic event for an event with a bubbling surrogate
@@ -582,16 +559,11 @@ function leverageNative( el, type, expectSync ) {
582559
} else if ( saved.length ) {
583560

584561
// ...and capture the result
585-
dataPriv.set( this, type, {
586-
value: jQuery.event.trigger(
587-
588-
// Support: IE <=9 - 11+
589-
// Extend with the prototype to reset the above stopImmediatePropagation()
590-
jQuery.extend( saved[ 0 ], jQuery.Event.prototype ),
591-
saved.slice( 1 ),
592-
this
593-
)
594-
} );
562+
dataPriv.set( this, type, jQuery.event.trigger(
563+
saved[ 0 ],
564+
saved.slice( 1 ),
565+
this
566+
) );
595567

596568
// Abort handling of the native event
597569
event.stopImmediatePropagation();
@@ -724,6 +696,29 @@ jQuery.each( {
724696
}, jQuery.event.addProp );
725697

726698
jQuery.each( { focus: "focusin", blur: "focusout" }, function( type, delegateType ) {
699+
700+
// Support: IE 11+
701+
// Attach a single focusin/focusout handler on the document while someone wants focus/blur.
702+
// This is because the former are synchronous in IE while the latter are async. In other
703+
// browsers, all those handlers are invoked synchronously.
704+
function focusMappedHandler( nativeEvent ) {
705+
706+
// `eventHandle` would already wrap the event, but we need to change the `type` here.
707+
var event = jQuery.event.fix( nativeEvent );
708+
event.type = nativeEvent.type === "focusin" ? "focus" : "blur";
709+
event.isSimulated = true;
710+
711+
// focus/blur don't bubble while focusin/focusout do; simulate the former by only
712+
// invoking the handler at the lower level.
713+
if ( event.target === event.currentTarget ) {
714+
715+
// The setup part calls `leverageNative`, which, in turn, calls
716+
// `jQuery.event.add`, so event handle will already have been set
717+
// by this point.
718+
dataPriv.get( this, "handle" )( event );
719+
}
720+
}
721+
727722
jQuery.event.special[ type ] = {
728723

729724
// Utilize native event if possible so blur/focus sequence is correct
@@ -732,10 +727,15 @@ jQuery.each( { focus: "focusin", blur: "focusout" }, function( type, delegateTyp
732727
// Claim the first handler
733728
// dataPriv.set( this, "focus", ... )
734729
// dataPriv.set( this, "blur", ... )
735-
leverageNative( this, type, expectSync );
730+
leverageNative( this, type, true );
731+
732+
if ( isIE ) {
733+
this.addEventListener( delegateType, focusMappedHandler );
734+
} else {
736735

737-
// Return false to allow normal processing in the caller
738-
return false;
736+
// Return false to allow normal processing in the caller
737+
return false;
738+
}
739739
},
740740
trigger: function() {
741741

@@ -746,6 +746,16 @@ jQuery.each( { focus: "focusin", blur: "focusout" }, function( type, delegateTyp
746746
return true;
747747
},
748748

749+
teardown: function() {
750+
if ( isIE ) {
751+
this.removeEventListener( delegateType, focusMappedHandler );
752+
} else {
753+
754+
// Return false to indicate standard teardown should be applied
755+
return false;
756+
}
757+
},
758+
749759
// Suppress native focus or blur if we're currently inside
750760
// a leveraged native-event stack
751761
_default: function( event ) {

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