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Event: Simulate focus/blur in IE via focusin/focusout (3.x version)
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). To preserve relative `focusin`/`focus` & `focusout`/`blur` event order guaranteed on the 3.x branch, attach a single handler for both events in IE. A side effect of this is that to reduce size the `event/focusin` module no longer exists and it's impossible to disable the `focusin` patch in modern browsers via the jQuery custom build system. Fixes gh-4856 Fixes gh-4859 Fixes gh-4950 Ref gh-5223 Closes gh-5224 Co-authored-by: Richard Gibson <richard.gibson@gmail.com>
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‎README.md‎

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@@ -95,7 +95,6 @@ Some example modules that can be excluded are:
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- **dimensions**: The `.width()` and `.height()` methods, including `inner-` and `outer-` variations.
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- **effects**: The `.animate()` method and its shorthands such as `.slideUp()` or `.hide("slow")`.
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- **event**: The `.on()` and `.off()` methods and all event functionality.
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- **event/focusin**: Cross-browser support for the focusin and focusout events.
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- **event/trigger**: The `.trigger()` and `.triggerHandler()` methods.
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- **offset**: The `.offset()`, `.position()`, `.offsetParent()`, `.scrollLeft()`, and `.scrollTop()` methods.
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- **wrap**: The `.wrap()`, `.wrapAll()`, `.wrapInner()`, and `.unwrap()` methods.

‎src/event.js‎

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@@ -27,25 +27,6 @@ function returnFalse() {
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return false;
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}
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// Support: IE <=9 - 11+
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// 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,
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// and blur to be synchronous when the element is not already active.
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// (focus and blur are always synchronous in other supported browsers,
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// this just defines when we can count on it).
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function expectSync( elem, type ) {
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return ( elem === safeActiveElement() ) === ( type === "focus" );
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}
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// Support: IE <=9 only
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// Accessing document.activeElement can throw unexpectedly
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// https://bugs.jquery.com/ticket/13393
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function safeActiveElement() {
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try {
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return document.activeElement;
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} catch ( err ) { }
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}
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function on( elem, types, selector, data, fn, one ) {
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var origFn, type;
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@@ -483,7 +464,7 @@ jQuery.event = {
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el.click && nodeName( el, "input" ) ) {
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// dataPriv.set( el, "click", ... )
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leverageNative( el, "click", returnTrue );
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leverageNative( el, "click", true );
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}
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// Return false to allow normal processing in the caller
@@ -534,10 +515,10 @@ jQuery.event = {
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// synthetic events by interrupting progress until reinvoked in response to
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// *native* events that it fires directly, ensuring that state changes have
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// already occurred before other listeners are invoked.
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function leverageNative( el, type, expectSync ) {
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function leverageNative( el, type, isSetup ) {
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// Missing expectSync indicates a trigger call, which must force setup through jQuery.event.add
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if ( !expectSync ) {
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// Missing `isSetup` indicates a trigger call, which must force setup through jQuery.event.add
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if ( !isSetup ) {
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if ( dataPriv.get( el, type ) === undefined ) {
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jQuery.event.add( el, type, returnTrue );
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}
@@ -549,15 +530,13 @@ function leverageNative( el, type, expectSync ) {
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jQuery.event.add( el, type, {
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namespace: false,
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handler: function( event ) {
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var notAsync, result,
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var result,
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saved = dataPriv.get( this, type );
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if ( ( event.isTrigger & 1 ) && this[ type ] ) {
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// Interrupt processing of the outer synthetic .trigger()ed event
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// Saved data should be false in such cases, but might be a leftover capture object
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// from an async native handler (gh-4350)
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if ( !saved.length ) {
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if ( !saved ) {
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// 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
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dataPriv.set( this, type, saved );
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// Trigger the native event and capture its result
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// Support: IE <=9 - 11+
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// focus() and blur() are asynchronous
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notAsync = expectSync( this, type );
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this[ type ]();
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result = dataPriv.get( this, type );
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if ( saved !== result || notAsync ) {
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dataPriv.set( this, type, false );
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} else {
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result = {};
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}
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dataPriv.set( this, type, false );
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if ( saved !== result ) {
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// Cancel the outer synthetic event
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event.stopImmediatePropagation();
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event.preventDefault();
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// Support: Chrome 86+
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// In Chrome, if an element having a focusout handler is blurred by
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// clicking outside of it, it invokes the handler synchronously. If
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// that handler calls `.remove()` on the element, the data is cleared,
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// leaving `result` undefined. We need to guard against this.
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return result && result.value;
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return result;
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}
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// If this is an inner synthetic event for an event with a bubbling surrogate
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} else if ( saved.length ) {
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// ...and capture the result
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dataPriv.set( this, type, {
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value: jQuery.event.trigger(
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// Support: IE <=9 - 11+
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// Extend with the prototype to reset the above stopImmediatePropagation()
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jQuery.extend( saved[ 0 ], jQuery.Event.prototype ),
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saved.slice( 1 ),
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this
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)
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} );
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dataPriv.set( this, type, jQuery.event.trigger(
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saved[ 0 ],
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saved.slice( 1 ),
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this
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) );
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// Abort handling of the native event
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event.stopImmediatePropagation();
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}, jQuery.event.addProp );
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jQuery.each( { focus: "focusin", blur: "focusout" }, function( type, delegateType ) {
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function focusMappedHandler( nativeEvent ) {
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if ( document.documentMode ) {
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// Support: IE 11+
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// Attach a single focusin/focusout handler on the document while someone wants
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// focus/blur. This is because the former are synchronous in IE while the latter
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// are async. In other browsers, all those handlers are invoked synchronously.
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// `handle` from private data would already wrap the event, but we need
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// to change the `type` here.
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var handle = dataPriv.get( this, "handle" ),
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event = jQuery.event.fix( nativeEvent );
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event.type = nativeEvent.type === "focusin" ? "focus" : "blur";
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event.isSimulated = true;
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// First, handle focusin/focusout
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handle( nativeEvent );
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// ...then, handle focus/blur
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//
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// focus/blur don't bubble while focusin/focusout do; simulate the former by only
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// invoking the handler at the lower level.
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if ( event.target === event.currentTarget ) {
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// The setup part calls `leverageNative`, which, in turn, calls
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// `jQuery.event.add`, so event handle will already have been set
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// by this point.
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handle( event );
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}
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} else {
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// For non-IE browsers, attach a single capturing handler on the document
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// while someone wants focusin/focusout.
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jQuery.event.simulate( delegateType, nativeEvent.target,
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jQuery.event.fix( nativeEvent ) );
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}
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}
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jQuery.event.special[ type ] = {
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// Utilize native event if possible so blur/focus sequence is correct
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setup: function() {
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var attaches;
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// Claim the first handler
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// dataPriv.set( this, "focus", ... )
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// dataPriv.set( this, "blur", ... )
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leverageNative( this, type, expectSync );
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leverageNative( this, type, true );
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if ( document.documentMode ) {
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// Return false to allow normal processing in the caller
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return false;
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// Support: IE 9 - 11+
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// We use the same native handler for focusin & focus (and focusout & blur)
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// so we need to coordinate setup & teardown parts between those events.
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// Use `delegateType` as the key as `type` is already used by `leverageNative`.
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attaches = dataPriv.get( this, delegateType );
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if ( !attaches ) {
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this.addEventListener( delegateType, focusMappedHandler );
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}
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dataPriv.set( this, delegateType, ( attaches || 0 ) + 1 );
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} else {
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// Return false to allow normal processing in the caller
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return false;
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}
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},
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trigger: function() {
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return true;
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},
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teardown: function() {
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var attaches;
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if ( document.documentMode ) {
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attaches = dataPriv.get( this, delegateType ) - 1;
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if ( !attaches ) {
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this.removeEventListener( delegateType, focusMappedHandler );
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dataPriv.remove( this, delegateType );
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} else {
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dataPriv.set( this, delegateType, attaches );
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}
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} else {
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// Return false to indicate standard teardown should be applied
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return false;
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}
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},
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// Suppress native focus or blur if we're currently inside
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// a leveraged native-event stack
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_default: function( event ) {
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delegateType: delegateType
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};
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// Support: Firefox <=44
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// Firefox doesn't have focus(in | out) events
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// Related ticket - https://bugzilla.mozilla.org/show_bug.cgi?id=687787
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//
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// Support: Chrome <=48 - 49, Safari <=9.0 - 9.1
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// focus(in | out) events fire after focus & blur events,
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// which is spec violation - http://www.w3.org/TR/DOM-Level-3-Events/#events-focusevent-event-order
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// Related ticket - https://bugs.chromium.org/p/chromium/issues/detail?id=449857
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//
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// Support: IE 9 - 11+
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// To preserve relative focusin/focus & focusout/blur event order guaranteed on the 3.x branch,
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// attach a single handler for both events in IE.
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jQuery.event.special[ delegateType ] = {
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setup: function() {
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// Handle: regular nodes (via `this.ownerDocument`), window
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// (via `this.document`) & document (via `this`).
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var doc = this.ownerDocument || this.document || this,
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dataHolder = document.documentMode ? this : doc,
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attaches = dataPriv.get( dataHolder, delegateType );
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847+
// Support: IE 9 - 11+
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// We use the same native handler for focusin & focus (and focusout & blur)
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// so we need to coordinate setup & teardown parts between those events.
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// Use `delegateType` as the key as `type` is already used by `leverageNative`.
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if ( !attaches ) {
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if ( document.documentMode ) {
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this.addEventListener( delegateType, focusMappedHandler );
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} else {
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doc.addEventListener( type, focusMappedHandler, true );
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}
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}
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dataPriv.set( dataHolder, delegateType, ( attaches || 0 ) + 1 );
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},
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teardown: function() {
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var doc = this.ownerDocument || this.document || this,
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dataHolder = document.documentMode ? this : doc,
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attaches = dataPriv.get( dataHolder, delegateType ) - 1;
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if ( !attaches ) {
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if ( document.documentMode ) {
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this.removeEventListener( delegateType, focusMappedHandler );
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} else {
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doc.removeEventListener( type, focusMappedHandler, true );
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}
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dataPriv.remove( dataHolder, delegateType );
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} else {
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dataPriv.set( dataHolder, delegateType, attaches );
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}
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}
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};
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} );
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// Create mouseenter/leave events using mouseover/out and event-time checks

‎src/event/focusin.js‎

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‎src/event/support.js‎

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‎src/jquery.js‎

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@@ -11,7 +11,6 @@ define( [
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"./queue/delay",
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"./attributes",
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"./event",
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"./event/focusin",
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"./manipulation",
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"./manipulation/_evalUrl",
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"./wrap",

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