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Event: Simulate focus/blur in IE via focusin/focusout

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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>
This commit is contained in:
Michał Gołębiowski-Owczarek 2023-03-27 21:22:38 +02:00 committed by GitHub
parent 992a1911d0
commit ce60d31893
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GPG Key ID: 4AEE18F83AFDEB23
2 changed files with 258 additions and 166 deletions
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92
src/event.js
View File

@ -1,9 +1,9 @@
import jQuery from "./core.js";
import document from "./var/document.js";
import documentElement from "./var/documentElement.js";
import rnothtmlwhite from "./var/rnothtmlwhite.js";
import rcheckableType from "./var/rcheckableType.js";
import slice from "./var/slice.js";
import isIE from "./var/isIE.js";
import acceptData from "./data/var/acceptData.js";
import dataPriv from "./data/var/dataPriv.js";
import nodeName from "./core/nodeName.js";
@ -21,16 +21,6 @@ function returnFalse() {
return false;
}
// Support: IE <=9 - 11+
// focus() and blur() are asynchronous, except when they are no-op.
// So expect focus to be synchronous when the element is already active,
// and blur to be synchronous when the element is not already active.
// (focus and blur are always synchronous in other supported browsers,
// this just defines when we can count on it).
function expectSync( elem, type ) {
return ( elem === document.activeElement ) === ( type === "focus" );
}
function on( elem, types, selector, data, fn, one ) {
var origFn, type;
@ -459,7 +449,7 @@ jQuery.event = {
el.click && nodeName( el, "input" ) ) {
// dataPriv.set( el, "click", ... )
leverageNative( el, "click", returnTrue );
leverageNative( el, "click", true );
}
// Return false to allow normal processing in the caller
@ -511,10 +501,10 @@ jQuery.event = {
// synthetic events by interrupting progress until reinvoked in response to
// *native* events that it fires directly, ensuring that state changes have
// already occurred before other listeners are invoked.
function leverageNative( el, type, expectSync ) {
function leverageNative( el, type, isSetup ) {
// Missing expectSync indicates a trigger call, which must force setup through jQuery.event.add
if ( !expectSync ) {
// Missing `isSetup` indicates a trigger call, which must force setup through jQuery.event.add
if ( !isSetup ) {
if ( dataPriv.get( el, type ) === undefined ) {
jQuery.event.add( el, type, returnTrue );
}
@ -526,15 +516,13 @@ function leverageNative( el, type, expectSync ) {
jQuery.event.add( el, type, {
namespace: false,
handler: function( event ) {
var notAsync, result,
var result,
saved = dataPriv.get( this, type );
if ( ( event.isTrigger & 1 ) && this[ type ] ) {
// Interrupt processing of the outer synthetic .trigger()ed event
// Saved data should be false in such cases, but might be a leftover capture object
// from an async native handler (gh-4350)
if ( !saved.length ) {
if ( !saved ) {
// Store arguments for use when handling the inner native event
// There will always be at least one argument (an event object), so this array
@ -543,28 +531,17 @@ function leverageNative( el, type, expectSync ) {
dataPriv.set( this, type, saved );
// Trigger the native event and capture its result
// Support: IE <=9 - 11+
// focus() and blur() are asynchronous
notAsync = expectSync( this, type );
this[ type ]();
result = dataPriv.get( this, type );
if ( saved !== result || notAsync ) {
dataPriv.set( this, type, false );
} else {
result = {};
}
if ( saved !== result ) {
// Cancel the outer synthetic event
event.stopImmediatePropagation();
event.preventDefault();
// Support: Chrome 86+
// In Chrome, if an element having a focusout handler is blurred by
// clicking outside of it, it invokes the handler synchronously. If
// that handler calls `.remove()` on the element, the data is cleared,
// leaving `result` undefined. We need to guard against this.
return result && result.value;
return result;
}
// If this is an inner synthetic event for an event with a bubbling surrogate
@ -582,16 +559,11 @@ function leverageNative( el, type, expectSync ) {
} else if ( saved.length ) {
// ...and capture the result
dataPriv.set( this, type, {
value: jQuery.event.trigger(
// Support: IE <=9 - 11+
// Extend with the prototype to reset the above stopImmediatePropagation()
jQuery.extend( saved[ 0 ], jQuery.Event.prototype ),
dataPriv.set( this, type, jQuery.event.trigger(
saved[ 0 ],
saved.slice( 1 ),
this
)
} );
) );
// Abort handling of the native event
event.stopImmediatePropagation();
@ -724,6 +696,29 @@ jQuery.each( {
}, jQuery.event.addProp );
jQuery.each( { focus: "focusin", blur: "focusout" }, function( type, delegateType ) {
// Support: IE 11+
// Attach a single focusin/focusout handler on the document while someone wants focus/blur.
// This is because the former are synchronous in IE while the latter are async. In other
// browsers, all those handlers are invoked synchronously.
function focusMappedHandler( nativeEvent ) {
// `eventHandle` would already wrap the event, but we need to change the `type` here.
var event = jQuery.event.fix( nativeEvent );
event.type = nativeEvent.type === "focusin" ? "focus" : "blur";
event.isSimulated = true;
// focus/blur don't bubble while focusin/focusout do; simulate the former by only
// invoking the handler at the lower level.
if ( event.target === event.currentTarget ) {
// The setup part calls `leverageNative`, which, in turn, calls
// `jQuery.event.add`, so event handle will already have been set
// by this point.
dataPriv.get( this, "handle" )( event );
}
}
jQuery.event.special[ type ] = {
// Utilize native event if possible so blur/focus sequence is correct
@ -732,10 +727,15 @@ jQuery.each( { focus: "focusin", blur: "focusout" }, function( type, delegateTyp
// Claim the first handler
// dataPriv.set( this, "focus", ... )
// dataPriv.set( this, "blur", ... )
leverageNative( this, type, expectSync );
leverageNative( this, type, true );
if ( isIE ) {
this.addEventListener( delegateType, focusMappedHandler );
} else {
// Return false to allow normal processing in the caller
return false;
}
},
trigger: function() {
@ -746,6 +746,16 @@ jQuery.each( { focus: "focusin", blur: "focusout" }, function( type, delegateTyp
return true;
},
teardown: function() {
if ( isIE ) {
this.removeEventListener( delegateType, focusMappedHandler );
} else {
// Return false to indicate standard teardown should be applied
return false;
}
},
// Suppress native focus or blur if we're currently inside
// a leveraged native-event stack
_default: function( event ) {

162
test/unit/event.js
View File

@ -2187,6 +2187,42 @@ QUnit.test( "focusin bubbles", function( assert ) {
jQuery( "body" ).off( "focusin.focusinBubblesTest" );
} );
QUnit.test( "focus does not bubble", function( assert ) {
assert.expect( 1 );
var done = assert.async(),
input = jQuery( "<input type='text' />" ).prependTo( "body" );
// focus the element so DOM focus won't fire
input[ 0 ].focus();
jQuery( "body" ).on( "focus.focusDoesNotBubbleTest", function() {
assert.ok( false, "focus doesn't fire on body" );
} );
input.on( "focus.focusDoesNotBubbleTest", function() {
assert.ok( true, "focus on the element" );
} );
// Removed since DOM focus is unreliable on test swarm
// DOM focus method
// input[ 0 ].focus();
// To make the next focus test work, we need to take focus off the input.
// This will fire another focusin event, so set order to reflect that.
// jQuery( "#text1" )[ 0 ].focus();
// jQuery trigger, which calls DOM focus
input.trigger( "focus" );
input.remove();
jQuery( "body" ).off( "focus.focusDoesNotBubbleTest" );
setTimeout( function() {
done();
}, 50 );
} );
QUnit.test( "custom events with colons (trac-3533, trac-8272)", function( assert ) {
assert.expect( 1 );
@ -2652,6 +2688,10 @@ QUnit.test( "element removed during focusout (gh-4417)", function( assert ) {
button[ 0 ].blur = function() {
jQuery.cleanData( [ this ] );
this.parentNode.removeChild( this );
// Redefine `blur` to avoid a hard crash in Karma tests that stop
// the test runner in case this test fails.
this.blur = jQuery.noop;
};
button[ 0 ].click();
@ -3067,12 +3107,7 @@ QUnit.test( "focusout/focusin support", function( assert ) {
var focus,
parent = jQuery( "<div>" ),
input = jQuery( "<input>" ),
inputExternal = jQuery( "<input>" ),
// Support: IE <=9 - 11+
// focus and blur events are asynchronous; this is the resulting mess.
// The browser window must be topmost for this to work properly!!
done = assert.async();
inputExternal = jQuery( "<input>" );
parent.append( input );
jQuery( "#qunit-fixture" ).append( parent ).append( inputExternal );
@ -3080,7 +3115,6 @@ QUnit.test( "focusout/focusin support", function( assert ) {
// initially, lose focus
inputExternal[ 0 ].focus();
setTimeout( function() {
parent
.on( "focus", function() {
assert.ok( false, "parent: focus not fired" );
@ -3116,8 +3150,6 @@ QUnit.test( "focusout/focusin support", function( assert ) {
// then lose it
inputExternal[ 0 ].focus();
setTimeout( function() {
// DOM focus is unreliable in TestSwarm
if ( QUnit.isSwarm && !focus ) {
assert.ok( true, "GAP: Could not observe focus change" );
@ -3131,10 +3163,6 @@ QUnit.test( "focusout/focusin support", function( assert ) {
// cleanup
parent.off();
input.off();
done();
}, 50 );
}, 50 );
} );
QUnit.test( "focus-blur order (trac-12868)", function( assert ) {
@ -3142,17 +3170,10 @@ QUnit.test( "focus-blur order (trac-12868)", function( assert ) {
var order,
$text = jQuery( "#text1" ),
$radio = jQuery( "#radio1" ),
// Support: IE <=9 - 11+
// focus and blur events are asynchronous; this is the resulting mess.
// The browser window must be topmost for this to work properly!!
done = assert.async();
$radio = jQuery( "#radio1" );
$radio[ 0 ].focus();
setTimeout( function() {
$text
.on( "focus", function() {
assert.equal( order++, 1, "text focus" );
@ -3172,7 +3193,6 @@ QUnit.test( "focus-blur order (trac-12868)", function( assert ) {
order = 0;
assert.equal( document.activeElement, $radio[ 0 ], "radio has focus" );
$text.trigger( "focus" );
setTimeout( function() {
// DOM focus is unreliable in TestSwarm
if ( QUnit.isSwarm && order === 0 ) {
@ -3189,9 +3209,6 @@ QUnit.test( "focus-blur order (trac-12868)", function( assert ) {
// Clean up
$text.off();
$radio.off();
done();
}, 50 );
}, 50 );
} );
QUnit.test( "Event handling works with multiple async focus events (gh-4350)", function( assert ) {
@ -3199,10 +3216,6 @@ QUnit.test( "Event handling works with multiple async focus events (gh-4350)", f
var remaining = 3,
input = jQuery( "#name" ),
// Support: IE <=9 - 11+
// focus and blur events are asynchronous; this is the resulting mess.
// The browser window must be topmost for this to work properly!!
done = assert.async();
input
@ -3212,6 +3225,17 @@ QUnit.test( "Event handling works with multiple async focus events (gh-4350)", f
if ( remaining > 0 ) {
input.trigger( "blur" );
} else {
if ( QUnit.isIE ) {
// Support: <=IE 11+
// In IE, one of the blurs sometimes triggers a focus on body
// which in turn restores focus to the input, leading to 4 assertions
// firing instead of three. This only happens if other tests are
// running on the same test page. Avoid this issue in tests by removing
// the handler early.
input.off( "focus" );
}
done();
}
} )
@ -3237,6 +3261,45 @@ QUnit.test( "Event handling works with multiple async focus events (gh-4350)", f
} );
} );
// Support: IE <=9 - 11+
// focus and blur events are asynchronous.
// The browser window must be topmost for this to work properly!!
QUnit.test( "async focus queues properly (gh-4859)", function( assert ) {
assert.expect( 1 );
var $text = jQuery( "#text1" ),
$radio = jQuery( "#radio1" ),
done = assert.async();
$text.trigger( "focus" );
$radio.trigger( "focus" );
$text.trigger( "focus" );
setTimeout( function() {
assert.equal( document.activeElement, $text[ 0 ], "focus follows the last trigger" );
done();
}, 500 );
} );
// Support: IE <=9 - 11+
// focus and blur events are asynchronous.
// The browser window must be topmost for this to work properly!!
QUnit.test( "async focus queues properly with blur (gh-4856)", function( assert ) {
assert.expect( 1 );
var $text = jQuery( "#text1" ),
done = assert.async();
$text.trigger( "focus" );
$text.trigger( "blur" );
$text.trigger( "focus" );
setTimeout( function() {
assert.equal( document.activeElement, $text[ 0 ], "focus-after-blur is respected" );
done();
}, 500 );
} );
QUnit.test( "native-backed events preserve trigger data (gh-1741, gh-4139)", function( assert ) {
assert.expect( 17 );
@ -3246,12 +3309,7 @@ QUnit.test( "native-backed events preserve trigger data (gh-1741, gh-4139)", fun
targets = jQuery( parent[ 0 ].childNodes ),
checkbox = jQuery( targets[ 0 ] ),
data = [ "arg1", "arg2" ],
slice = data.slice,
// Support: IE <=9 - 11+
// focus and blur events are asynchronous; this is the resulting mess.
// The browser window must be topmost for this to work properly!!
done = assert.async();
slice = data.slice;
// click (gh-4139)
assert.strictEqual( targets[ 0 ].checked, false, "checkbox unchecked before click" );
@ -3277,18 +3335,26 @@ QUnit.test( "native-backed events preserve trigger data (gh-1741, gh-4139)", fun
var type = event.type;
assert.deepEqual( slice.call( arguments, 1 ), data,
type + " handler received correct data" );
if ( QUnit.isIE && type === "focus" ) {
// Support: <=IE 11+
// In IE, one of the blurs sometimes triggers a focus on body
// which in turn restores focus to the input, leading to 4 assertions
// firing instead of three. This only happens if other tests are
// running on the same test page. Avoid this issue in tests by removing
// the handler early.
checkbox.off( "focus" );
}
} );
checkbox.trigger( "focus", data );
setTimeout( function() {
assert.strictEqual( document.activeElement, checkbox[ 0 ],
"element focused after focus event (default action)" );
checkbox.trigger( "blur", data );
setTimeout( function() {
assert.notEqual( document.activeElement, checkbox[ 0 ],
"element not focused after blur event (default action)" );
done();
}, 50 );
}, 50 );
} );
QUnit.test( "focus change during a focus handler (gh-4382)", function( assert ) {
@ -3341,6 +3407,22 @@ QUnit.test( "trigger(focus) works after .on(focus).off(focus) (gh-4867)", functi
assert.equal( document.activeElement, input[ 0 ], "input has focus" );
} );
QUnit.test( "trigger(focus) works after focusing when hidden (gh-4950)", function( assert ) {
assert.expect( 1 );
var input = jQuery( "<input />" );
input.appendTo( "#qunit-fixture" );
input
.css( "display", "none" )
.trigger( "focus" )
.css( "display", "" )
.trigger( "focus" );
assert.equal( document.activeElement, input[ 0 ], "input has focus" );
} );
// TODO replace with an adaptation of
// https://github.com/jquery/jquery/pull/1367/files#diff-a215316abbaabdf71857809e8673ea28R2464
( function() {