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Edit File : autocomplete.js \| Size : 17.12 KB
/! jQuery UI Autocomplete 1.13.3 * https://jqueryui.com * * Copyright OpenJS Foundation and other contributors * Released under the MIT license. * https://jquery.org/license / //>>label: Autocomplete //>>group: Widgets //>>description: Lists suggested words as the user is typing. //>>docs: https://api.jqueryui.com/autocomplete/ //>>demos: https://jqueryui.com/autocomplete/ //>>css.structure: ../../themes/base/core.css //>>css.structure: ../../themes/base/autocomplete.css //>>css.theme: ../../themes/base/theme.css ( function( factory ) { "use strict"; if ( typeof define === "function" && define.amd ) { // AMD. Register as an anonymous module. define( [ "jquery", "./menu", "../keycode", "../position", "../safe-active-element", "../version", "../widget" ], factory ); } else { // Browser globals factory( jQuery ); } } )( function( $ ) { "use strict"; $.widget( "ui.autocomplete", { version: "1.13.3", defaultElement: "<input>", options: { appendTo: null, autoFocus: false, delay: 300, minLength: 1, position: { my: "left top", at: "left bottom", collision: "none" }, source: null, // Callbacks change: null, close: null, focus: null, open: null, response: null, search: null, select: null }, requestIndex: 0, pending: 0, liveRegionTimer: null, _create: function() { // Some browsers only repeat keydown events, not keypress events, // so we use the suppressKeyPress flag to determine if we've already // handled the keydown event. #7269 // Unfortunately the code for & in keypress is the same as the up arrow, // so we use the suppressKeyPressRepeat flag to avoid handling keypress // events when we know the keydown event was used to modify the // search term. #7799 var suppressKeyPress, suppressKeyPressRepeat, suppressInput, nodeName = this.element[ 0 ].nodeName.toLowerCase(), isTextarea = nodeName === "textarea", isInput = nodeName === "input"; // Textareas are always multi-line // Inputs are always single-line, even if inside a contentEditable element // IE also treats inputs as contentEditable // All other element types are determined by whether or not they're contentEditable this.isMultiLine = isTextarea \|\| !isInput && this._isContentEditable( this.element ); this.valueMethod = this.element[ isTextarea \|\| isInput ? "val" : "text" ]; this.isNewMenu = true; this._addClass( "ui-autocomplete-input" ); this.element.attr( "autocomplete", "off" ); this._on( this.element, { keydown: function( event ) { if ( this.element.prop( "readOnly" ) ) { suppressKeyPress = true; suppressInput = true; suppressKeyPressRepeat = true; return; } suppressKeyPress = false; suppressInput = false; suppressKeyPressRepeat = false; var keyCode = $.ui.keyCode; switch ( event.keyCode ) { case keyCode.PAGE_UP: suppressKeyPress = true; this._move( "previousPage", event ); break; case keyCode.PAGE_DOWN: suppressKeyPress = true; this._move( "nextPage", event ); break; case keyCode.UP: suppressKeyPress = true; this._keyEvent( "previous", event ); break; case keyCode.DOWN: suppressKeyPress = true; this._keyEvent( "next", event ); break; case keyCode.ENTER: // when menu is open and has focus if ( this.menu.active ) { // #6055 - Opera still allows the keypress to occur // which causes forms to submit suppressKeyPress = true; event.preventDefault(); this.menu.select( event ); } break; case keyCode.TAB: if ( this.menu.active ) { this.menu.select( event ); } break; case keyCode.ESCAPE: if ( this.menu.element.is( ":visible" ) ) { if ( !this.isMultiLine ) { this._value( this.term ); } this.close( event ); // Different browsers have different default behavior for escape // Single press can mean undo or clear // Double press in IE means clear the whole form event.preventDefault(); } break; default: suppressKeyPressRepeat = true; // search timeout should be triggered before the input value is changed this._searchTimeout( event ); break; } }, keypress: function( event ) { if ( suppressKeyPress ) { suppressKeyPress = false; if ( !this.isMultiLine \|\| this.menu.element.is( ":visible" ) ) { event.preventDefault(); } return; } if ( suppressKeyPressRepeat ) { return; } // Replicate some key handlers to allow them to repeat in Firefox and Opera var keyCode = $.ui.keyCode; switch ( event.keyCode ) { case keyCode.PAGE_UP: this._move( "previousPage", event ); break; case keyCode.PAGE_DOWN: this._move( "nextPage", event ); break; case keyCode.UP: this._keyEvent( "previous", event ); break; case keyCode.DOWN: this._keyEvent( "next", event ); break; } }, input: function( event ) { if ( suppressInput ) { suppressInput = false; event.preventDefault(); return; } this._searchTimeout( event ); }, focus: function() { this.selectedItem = null; this.previous = this._value(); }, blur: function( event ) { clearTimeout( this.searching ); this.close( event ); this._change( event ); } } ); this._initSource(); this.menu = $( "<ul>" ) .appendTo( this._appendTo() ) .menu( { // disable ARIA support, the live region takes care of that role: null } ) .hide() // Support: IE 11 only, Edge <= 14 // For other browsers, we preventDefault() on the mousedown event // to keep the dropdown from taking focus from the input. This doesn't // work for IE/Edge, causing problems with selection and scrolling (#9638) // Happily, IE and Edge support an "unselectable" attribute that // prevents an element from receiving focus, exactly what we want here. .attr( { "unselectable": "on" } ) .menu( "instance" ); this._addClass( this.menu.element, "ui-autocomplete", "ui-front" ); this._on( this.menu.element, { mousedown: function( event ) { // Prevent moving focus out of the text field event.preventDefault(); }, menufocus: function( event, ui ) { var label, item; // support: Firefox // Prevent accidental activation of menu items in Firefox (#7024 #9118) if ( this.isNewMenu ) { this.isNewMenu = false; if ( event.originalEvent && /^mouse/.test( event.originalEvent.type ) ) { this.menu.blur(); this.document.one( "mousemove", function() { $( event.target ).trigger( event.originalEvent ); } ); return; } } item = ui.item.data( "ui-autocomplete-item" ); if ( false !== this._trigger( "focus", event, { item: item } ) ) { // use value to match what will end up in the input, if it was a key event if ( event.originalEvent && /^key/.test( event.originalEvent.type ) ) { this._value( item.value ); } } // Announce the value in the liveRegion label = ui.item.attr( "aria-label" ) \|\| item.value; if ( label && String.prototype.trim.call( label ).length ) { clearTimeout( this.liveRegionTimer ); this.liveRegionTimer = this._delay( function() { this.liveRegion.html( $( "<div>" ).text( label ) ); }, 100 ); } }, menuselect: function( event, ui ) { var item = ui.item.data( "ui-autocomplete-item" ), previous = this.previous; // Only trigger when focus was lost (click on menu) if ( this.element[ 0 ] !== $.ui.safeActiveElement( this.document[ 0 ] ) ) { this.element.trigger( "focus" ); this.previous = previous; // #6109 - IE triggers two focus events and the second // is asynchronous, so we need to reset the previous // term synchronously and asynchronously :-( this._delay( function() { this.previous = previous; this.selectedItem = item; } ); } if ( false !== this._trigger( "select", event, { item: item } ) ) { this._value( item.value ); } // reset the term after the select event // this allows custom select handling to work properly this.term = this._value(); this.close( event ); this.selectedItem = item; } } ); this.liveRegion = $( "<div>", { role: "status", "aria-live": "assertive", "aria-relevant": "additions" } ) .appendTo( this.document[ 0 ].body ); this._addClass( this.liveRegion, null, "ui-helper-hidden-accessible" ); // Turning off autocomplete prevents the browser from remembering the // value when navigating through history, so we re-enable autocomplete // if the page is unloaded before the widget is destroyed. #7790 this._on( this.window, { beforeunload: function() { this.element.removeAttr( "autocomplete" ); } } ); }, _destroy: function() { clearTimeout( this.searching ); this.element.removeAttr( "autocomplete" ); this.menu.element.remove(); this.liveRegion.remove(); }, _setOption: function( key, value ) { this._super( key, value ); if ( key === "source" ) { this._initSource(); } if ( key === "appendTo" ) { this.menu.element.appendTo( this._appendTo() ); } if ( key === "disabled" && value && this.xhr ) { this.xhr.abort(); } }, _isEventTargetInWidget: function( event ) { var menuElement = this.menu.element[ 0 ]; return event.target === this.element[ 0 ] \|\| event.target === menuElement \|\| $.contains( menuElement, event.target ); }, _closeOnClickOutside: function( event ) { if ( !this._isEventTargetInWidget( event ) ) { this.close(); } }, _appendTo: function() { var element = this.options.appendTo; if ( element ) { element = element.jquery \|\| element.nodeType ? $( element ) : this.document.find( element ).eq( 0 ); } if ( !element \|\| !element[ 0 ] ) { element = this.element.closest( ".ui-front, dialog" ); } if ( !element.length ) { element = this.document[ 0 ].body; } return element; }, _initSource: function() { var array, url, that = this; if ( Array.isArray( this.options.source ) ) { array = this.options.source; this.source = function( request, response ) { response( $.ui.autocomplete.filter( array, request.term ) ); }; } else if ( typeof this.options.source === "string" ) { url = this.options.source; this.source = function( request, response ) { if ( that.xhr ) { that.xhr.abort(); } that.xhr = $.ajax( { url: url, data: request, dataType: "json", success: function( data ) { response( data ); }, error: function() { response( [] ); } } ); }; } else { this.source = this.options.source; } }, _searchTimeout: function( event ) { clearTimeout( this.searching ); this.searching = this._delay( function() { // Search if the value has changed, or if the user retypes the same value (see #7434) var equalValues = this.term === this._value(), menuVisible = this.menu.element.is( ":visible" ), modifierKey = event.altKey \|\| event.ctrlKey \|\| event.metaKey \|\| event.shiftKey; if ( !equalValues \|\| ( equalValues && !menuVisible && !modifierKey ) ) { this.selectedItem = null; this.search( null, event ); } }, this.options.delay ); }, search: function( value, event ) { value = value != null ? value : this._value(); // Always save the actual value, not the one passed as an argument this.term = this._value(); if ( value.length < this.options.minLength ) { return this.close( event ); } if ( this._trigger( "search", event ) === false ) { return; } return this._search( value ); }, _search: function( value ) { this.pending++; this._addClass( "ui-autocomplete-loading" ); this.cancelSearch = false; this.source( { term: value }, this._response() ); }, _response: function() { var index = ++this.requestIndex; return function( content ) { if ( index === this.requestIndex ) { this.__response( content ); } this.pending--; if ( !this.pending ) { this._removeClass( "ui-autocomplete-loading" ); } }.bind( this ); }, __response: function( content ) { if ( content ) { content = this._normalize( content ); } this._trigger( "response", null, { content: content } ); if ( !this.options.disabled && content && content.length && !this.cancelSearch ) { this._suggest( content ); this._trigger( "open" ); } else { // use ._close() instead of .close() so we don't cancel future searches this._close(); } }, close: function( event ) { this.cancelSearch = true; this._close( event ); }, _close: function( event ) { // Remove the handler that closes the menu on outside clicks this._off( this.document, "mousedown" ); if ( this.menu.element.is( ":visible" ) ) { this.menu.element.hide(); this.menu.blur(); this.isNewMenu = true; this._trigger( "close", event ); } }, _change: function( event ) { if ( this.previous !== this._value() ) { this._trigger( "change", event, { item: this.selectedItem } ); } }, _normalize: function( items ) { // assume all items have the right format when the first item is complete if ( items.length && items[ 0 ].label && items[ 0 ].value ) { return items; } return $.map( items, function( item ) { if ( typeof item === "string" ) { return { label: item, value: item }; } return $.extend( {}, item, { label: item.label \|\| item.value, value: item.value \|\| item.label } ); } ); }, _suggest: function( items ) { var ul = this.menu.element.empty(); this._renderMenu( ul, items ); this.isNewMenu = true; this.menu.refresh(); // Size and position menu ul.show(); this._resizeMenu(); ul.position( $.extend( { of: this.element }, this.options.position ) ); if ( this.options.autoFocus ) { this.menu.next(); } // Listen for interactions outside of the widget (#6642) this._on( this.document, { mousedown: "_closeOnClickOutside" } ); }, _resizeMenu: function() { var ul = this.menu.element; ul.outerWidth( Math.max( // Firefox wraps long text (possibly a rounding bug) // so we add 1px to avoid the wrapping (#7513) ul.width( "" ).outerWidth() + 1, this.element.outerWidth() ) ); }, _renderMenu: function( ul, items ) { var that = this; $.each( items, function( index, item ) { that._renderItemData( ul, item ); } ); }, _renderItemData: function( ul, item ) { return this._renderItem( ul, item ).data( "ui-autocomplete-item", item ); }, _renderItem: function( ul, item ) { return $( "<li>" ) .append( $( "<div>" ).text( item.label ) ) .appendTo( ul ); }, _move: function( direction, event ) { if ( !this.menu.element.is( ":visible" ) ) { this.search( null, event ); return; } if ( this.menu.isFirstItem() && /^previous/.test( direction ) \|\| this.menu.isLastItem() && /^next/.test( direction ) ) { if ( !this.isMultiLine ) { this._value( this.term ); } this.menu.blur(); return; } this.menu[ direction ]( event ); }, widget: function() { return this.menu.element; }, _value: function() { return this.valueMethod.apply( this.element, arguments ); }, _keyEvent: function( keyEvent, event ) { if ( !this.isMultiLine \|\| this.menu.element.is( ":visible" ) ) { this._move( keyEvent, event ); // Prevents moving cursor to beginning/end of the text field in some browsers event.preventDefault(); } }, // Support: Chrome <=50 // We should be able to just use this.element.prop( "isContentEditable" ) // but hidden elements always report false in Chrome. // https://code.google.com/p/chromium/issues/detail?id=313082 _isContentEditable: function( element ) { if ( !element.length ) { return false; } var editable = element.prop( "contentEditable" ); if ( editable === "inherit" ) { return this._isContentEditable( element.parent() ); } return editable === "true"; } } ); $.extend( $.ui.autocomplete, { escapeRegex: function( value ) { return value.replace( /[\-\[\]{}()+?.,\\\^$\|#\s]/g, "\\$&" ); }, filter: function( array, term ) { var matcher = new RegExp( $.ui.autocomplete.escapeRegex( term ), "i" ); return $.grep( array, function( value ) { return matcher.test( value.label \|\| value.value \|\| value ); } ); } } ); // Live region extension, adding a `messages` option // NOTE: This is an experimental API. We are still investigating // a full solution for string manipulation and internationalization. $.widget( "ui.autocomplete", $.ui.autocomplete, { options: { messages: { noResults: "No search results.", results: function( amount ) { return amount + ( amount > 1 ? " results are" : " result is" ) + " available, use up and down arrow keys to navigate."; } } }, __response: function( content ) { var message; this._superApply( arguments ); if ( this.options.disabled \|\| this.cancelSearch ) { return; } if ( content && content.length ) { message = this.options.messages.results( content.length ); } else { message = this.options.messages.noResults; } clearTimeout( this.liveRegionTimer ); this.liveRegionTimer = this._delay( function() { this.liveRegion.html( $( "<div>" ).text( message ) ); }, 100 ); } } ); return $.ui.autocomplete; } ); Back

Edit File : autocomplete.js | Size : 17.12 KB

/*!
 * jQuery UI Autocomplete 1.13.3
 * https://jqueryui.com
 *
 * Copyright OpenJS Foundation and other contributors
 * Released under the MIT license.
 * https://jquery.org/license
 */

//>>label: Autocomplete
//>>group: Widgets
//>>description: Lists suggested words as the user is typing.
//>>docs: https://api.jqueryui.com/autocomplete/
//>>demos: https://jqueryui.com/autocomplete/
//>>css.structure: ../../themes/base/core.css
//>>css.structure: ../../themes/base/autocomplete.css
//>>css.theme: ../../themes/base/theme.css

( function( factory ) {
	"use strict";

if ( typeof define === "function" && define.amd ) {

// AMD. Register as an anonymous module.
		define( [
			"jquery",
			"./menu",
			"../keycode",
			"../position",
			"../safe-active-element",
			"../version",
			"../widget"
		], factory );
	} else {

// Browser globals
		factory( jQuery );
	}
} )( function( $ ) {
"use strict";

$.widget( "ui.autocomplete", {
	version: "1.13.3",
	defaultElement: "<input>",
	options: {
		appendTo: null,
		autoFocus: false,
		delay: 300,
		minLength: 1,
		position: {
			my: "left top",
			at: "left bottom",
			collision: "none"
		},
		source: null,

// Callbacks
		change: null,
		close: null,
		focus: null,
		open: null,
		response: null,
		search: null,
		select: null
	},

requestIndex: 0,
	pending: 0,
	liveRegionTimer: null,

_create: function() {

// Some browsers only repeat keydown events, not keypress events,
		// so we use the suppressKeyPress flag to determine if we've already
		// handled the keydown event. #7269
		// Unfortunately the code for & in keypress is the same as the up arrow,
		// so we use the suppressKeyPressRepeat flag to avoid handling keypress
		// events when we know the keydown event was used to modify the
		// search term. #7799
		var suppressKeyPress, suppressKeyPressRepeat, suppressInput,
			nodeName = this.element[ 0 ].nodeName.toLowerCase(),
			isTextarea = nodeName === "textarea",
			isInput = nodeName === "input";

// Textareas are always multi-line
		// Inputs are always single-line, even if inside a contentEditable element
		// IE also treats inputs as contentEditable
		// All other element types are determined by whether or not they're contentEditable
		this.isMultiLine = isTextarea || !isInput && this._isContentEditable( this.element );

this.valueMethod = this.element[ isTextarea || isInput ? "val" : "text" ];
		this.isNewMenu = true;

this._addClass( "ui-autocomplete-input" );
		this.element.attr( "autocomplete", "off" );

this._on( this.element, {
			keydown: function( event ) {
				if ( this.element.prop( "readOnly" ) ) {
					suppressKeyPress = true;
					suppressInput = true;
					suppressKeyPressRepeat = true;
					return;
				}

suppressKeyPress = false;
				suppressInput = false;
				suppressKeyPressRepeat = false;
				var keyCode = $.ui.keyCode;
				switch ( event.keyCode ) {
				case keyCode.PAGE_UP:
					suppressKeyPress = true;
					this._move( "previousPage", event );
					break;
				case keyCode.PAGE_DOWN:
					suppressKeyPress = true;
					this._move( "nextPage", event );
					break;
				case keyCode.UP:
					suppressKeyPress = true;
					this._keyEvent( "previous", event );
					break;
				case keyCode.DOWN:
					suppressKeyPress = true;
					this._keyEvent( "next", event );
					break;
				case keyCode.ENTER:

// when menu is open and has focus
					if ( this.menu.active ) {

// #6055 - Opera still allows the keypress to occur
						// which causes forms to submit
						suppressKeyPress = true;
						event.preventDefault();
						this.menu.select( event );
					}
					break;
				case keyCode.TAB:
					if ( this.menu.active ) {
						this.menu.select( event );
					}
					break;
				case keyCode.ESCAPE:
					if ( this.menu.element.is( ":visible" ) ) {
						if ( !this.isMultiLine ) {
							this._value( this.term );
						}
						this.close( event );

// Different browsers have different default behavior for escape
						// Single press can mean undo or clear
						// Double press in IE means clear the whole form
						event.preventDefault();
					}
					break;
				default:
					suppressKeyPressRepeat = true;

// search timeout should be triggered before the input value is changed
					this._searchTimeout( event );
					break;
				}
			},
			keypress: function( event ) {
				if ( suppressKeyPress ) {
					suppressKeyPress = false;
					if ( !this.isMultiLine || this.menu.element.is( ":visible" ) ) {
						event.preventDefault();
					}
					return;
				}
				if ( suppressKeyPressRepeat ) {
					return;
				}

// Replicate some key handlers to allow them to repeat in Firefox and Opera
				var keyCode = $.ui.keyCode;
				switch ( event.keyCode ) {
				case keyCode.PAGE_UP:
					this._move( "previousPage", event );
					break;
				case keyCode.PAGE_DOWN:
					this._move( "nextPage", event );
					break;
				case keyCode.UP:
					this._keyEvent( "previous", event );
					break;
				case keyCode.DOWN:
					this._keyEvent( "next", event );
					break;
				}
			},
			input: function( event ) {
				if ( suppressInput ) {
					suppressInput = false;
					event.preventDefault();
					return;
				}
				this._searchTimeout( event );
			},
			focus: function() {
				this.selectedItem = null;
				this.previous = this._value();
			},
			blur: function( event ) {
				clearTimeout( this.searching );
				this.close( event );
				this._change( event );
			}
		} );

this._initSource();
		this.menu = $( "<ul>" )
			.appendTo( this._appendTo() )
			.menu( {

// disable ARIA support, the live region takes care of that
				role: null
			} )
			.hide()

// Support: IE 11 only, Edge <= 14
			// For other browsers, we preventDefault() on the mousedown event
			// to keep the dropdown from taking focus from the input. This doesn't
			// work for IE/Edge, causing problems with selection and scrolling (#9638)
			// Happily, IE and Edge support an "unselectable" attribute that
			// prevents an element from receiving focus, exactly what we want here.
			.attr( {
				"unselectable": "on"
			} )
			.menu( "instance" );

this._addClass( this.menu.element, "ui-autocomplete", "ui-front" );
		this._on( this.menu.element, {
			mousedown: function( event ) {

// Prevent moving focus out of the text field
				event.preventDefault();
			},
			menufocus: function( event, ui ) {
				var label, item;

// support: Firefox
				// Prevent accidental activation of menu items in Firefox (#7024 #9118)
				if ( this.isNewMenu ) {
					this.isNewMenu = false;
					if ( event.originalEvent && /^mouse/.test( event.originalEvent.type ) ) {
						this.menu.blur();

this.document.one( "mousemove", function() {
							$( event.target ).trigger( event.originalEvent );
						} );

return;
					}
				}

item = ui.item.data( "ui-autocomplete-item" );
				if ( false !== this._trigger( "focus", event, { item: item } ) ) {

// use value to match what will end up in the input, if it was a key event
					if ( event.originalEvent && /^key/.test( event.originalEvent.type ) ) {
						this._value( item.value );
					}
				}

// Announce the value in the liveRegion
				label = ui.item.attr( "aria-label" ) || item.value;
				if ( label && String.prototype.trim.call( label ).length ) {
					clearTimeout( this.liveRegionTimer );
					this.liveRegionTimer = this._delay( function() {
						this.liveRegion.html( $( "<div>" ).text( label ) );
					}, 100 );
				}
			},
			menuselect: function( event, ui ) {
				var item = ui.item.data( "ui-autocomplete-item" ),
					previous = this.previous;

// Only trigger when focus was lost (click on menu)
				if ( this.element[ 0 ] !== $.ui.safeActiveElement( this.document[ 0 ] ) ) {
					this.element.trigger( "focus" );
					this.previous = previous;

// #6109 - IE triggers two focus events and the second
					// is asynchronous, so we need to reset the previous
					// term synchronously and asynchronously :-(
					this._delay( function() {
						this.previous = previous;
						this.selectedItem = item;
					} );
				}

if ( false !== this._trigger( "select", event, { item: item } ) ) {
					this._value( item.value );
				}

// reset the term after the select event
				// this allows custom select handling to work properly
				this.term = this._value();

this.close( event );
				this.selectedItem = item;
			}
		} );

this.liveRegion = $( "<div>", {
			role: "status",
			"aria-live": "assertive",
			"aria-relevant": "additions"
		} )
			.appendTo( this.document[ 0 ].body );

this._addClass( this.liveRegion, null, "ui-helper-hidden-accessible" );

// Turning off autocomplete prevents the browser from remembering the
		// value when navigating through history, so we re-enable autocomplete
		// if the page is unloaded before the widget is destroyed. #7790
		this._on( this.window, {
			beforeunload: function() {
				this.element.removeAttr( "autocomplete" );
			}
		} );
	},

_destroy: function() {
		clearTimeout( this.searching );
		this.element.removeAttr( "autocomplete" );
		this.menu.element.remove();
		this.liveRegion.remove();
	},

_setOption: function( key, value ) {
		this._super( key, value );
		if ( key === "source" ) {
			this._initSource();
		}
		if ( key === "appendTo" ) {
			this.menu.element.appendTo( this._appendTo() );
		}
		if ( key === "disabled" && value && this.xhr ) {
			this.xhr.abort();
		}
	},

_isEventTargetInWidget: function( event ) {
		var menuElement = this.menu.element[ 0 ];

return event.target === this.element[ 0 ] ||
			event.target === menuElement ||
			$.contains( menuElement, event.target );
	},

_closeOnClickOutside: function( event ) {
		if ( !this._isEventTargetInWidget( event ) ) {
			this.close();
		}
	},

_appendTo: function() {
		var element = this.options.appendTo;

if ( element ) {
			element = element.jquery || element.nodeType ?
				$( element ) :
				this.document.find( element ).eq( 0 );
		}

if ( !element || !element[ 0 ] ) {
			element = this.element.closest( ".ui-front, dialog" );
		}

if ( !element.length ) {
			element = this.document[ 0 ].body;
		}

return element;
	},

_initSource: function() {
		var array, url,
			that = this;
		if ( Array.isArray( this.options.source ) ) {
			array = this.options.source;
			this.source = function( request, response ) {
				response( $.ui.autocomplete.filter( array, request.term ) );
			};
		} else if ( typeof this.options.source === "string" ) {
			url = this.options.source;
			this.source = function( request, response ) {
				if ( that.xhr ) {
					that.xhr.abort();
				}
				that.xhr = $.ajax( {
					url: url,
					data: request,
					dataType: "json",
					success: function( data ) {
						response( data );
					},
					error: function() {
						response( [] );
					}
				} );
			};
		} else {
			this.source = this.options.source;
		}
	},

_searchTimeout: function( event ) {
		clearTimeout( this.searching );
		this.searching = this._delay( function() {

// Search if the value has changed, or if the user retypes the same value (see #7434)
			var equalValues = this.term === this._value(),
				menuVisible = this.menu.element.is( ":visible" ),
				modifierKey = event.altKey || event.ctrlKey || event.metaKey || event.shiftKey;

if ( !equalValues || ( equalValues && !menuVisible && !modifierKey ) ) {
				this.selectedItem = null;
				this.search( null, event );
			}
		}, this.options.delay );
	},

search: function( value, event ) {
		value = value != null ? value : this._value();

// Always save the actual value, not the one passed as an argument
		this.term = this._value();

if ( value.length < this.options.minLength ) {
			return this.close( event );
		}

if ( this._trigger( "search", event ) === false ) {
			return;
		}

return this._search( value );
	},

_search: function( value ) {
		this.pending++;
		this._addClass( "ui-autocomplete-loading" );
		this.cancelSearch = false;

this.source( { term: value }, this._response() );
	},

_response: function() {
		var index = ++this.requestIndex;

return function( content ) {
			if ( index === this.requestIndex ) {
				this.__response( content );
			}

this.pending--;
			if ( !this.pending ) {
				this._removeClass( "ui-autocomplete-loading" );
			}
		}.bind( this );
	},

__response: function( content ) {
		if ( content ) {
			content = this._normalize( content );
		}
		this._trigger( "response", null, { content: content } );
		if ( !this.options.disabled && content && content.length && !this.cancelSearch ) {
			this._suggest( content );
			this._trigger( "open" );
		} else {

// use ._close() instead of .close() so we don't cancel future searches
			this._close();
		}
	},

close: function( event ) {
		this.cancelSearch = true;
		this._close( event );
	},

_close: function( event ) {

// Remove the handler that closes the menu on outside clicks
		this._off( this.document, "mousedown" );

if ( this.menu.element.is( ":visible" ) ) {
			this.menu.element.hide();
			this.menu.blur();
			this.isNewMenu = true;
			this._trigger( "close", event );
		}
	},

_change: function( event ) {
		if ( this.previous !== this._value() ) {
			this._trigger( "change", event, { item: this.selectedItem } );
		}
	},

_normalize: function( items ) {

// assume all items have the right format when the first item is complete
		if ( items.length && items[ 0 ].label && items[ 0 ].value ) {
			return items;
		}
		return $.map( items, function( item ) {
			if ( typeof item === "string" ) {
				return {
					label: item,
					value: item
				};
			}
			return $.extend( {}, item, {
				label: item.label || item.value,
				value: item.value || item.label
			} );
		} );
	},

_suggest: function( items ) {
		var ul = this.menu.element.empty();
		this._renderMenu( ul, items );
		this.isNewMenu = true;
		this.menu.refresh();

// Size and position menu
		ul.show();
		this._resizeMenu();
		ul.position( $.extend( {
			of: this.element
		}, this.options.position ) );

if ( this.options.autoFocus ) {
			this.menu.next();
		}

// Listen for interactions outside of the widget (#6642)
		this._on( this.document, {
			mousedown: "_closeOnClickOutside"
		} );
	},

_resizeMenu: function() {
		var ul = this.menu.element;
		ul.outerWidth( Math.max(

// Firefox wraps long text (possibly a rounding bug)
			// so we add 1px to avoid the wrapping (#7513)
			ul.width( "" ).outerWidth() + 1,
			this.element.outerWidth()
		) );
	},

_renderMenu: function( ul, items ) {
		var that = this;
		$.each( items, function( index, item ) {
			that._renderItemData( ul, item );
		} );
	},

_renderItemData: function( ul, item ) {
		return this._renderItem( ul, item ).data( "ui-autocomplete-item", item );
	},

_renderItem: function( ul, item ) {
		return $( "<li>" )
			.append( $( "<div>" ).text( item.label ) )
			.appendTo( ul );
	},

_move: function( direction, event ) {
		if ( !this.menu.element.is( ":visible" ) ) {
			this.search( null, event );
			return;
		}
		if ( this.menu.isFirstItem() && /^previous/.test( direction ) ||
				this.menu.isLastItem() && /^next/.test( direction ) ) {

if ( !this.isMultiLine ) {
				this._value( this.term );
			}

this.menu.blur();
			return;
		}
		this.menu[ direction ]( event );
	},

widget: function() {
		return this.menu.element;
	},

_value: function() {
		return this.valueMethod.apply( this.element, arguments );
	},

_keyEvent: function( keyEvent, event ) {
		if ( !this.isMultiLine || this.menu.element.is( ":visible" ) ) {
			this._move( keyEvent, event );

// Prevents moving cursor to beginning/end of the text field in some browsers
			event.preventDefault();
		}
	},

// Support: Chrome <=50
	// We should be able to just use this.element.prop( "isContentEditable" )
	// but hidden elements always report false in Chrome.
	// https://code.google.com/p/chromium/issues/detail?id=313082
	_isContentEditable: function( element ) {
		if ( !element.length ) {
			return false;
		}

var editable = element.prop( "contentEditable" );

if ( editable === "inherit" ) {
			return this._isContentEditable( element.parent() );
		}

return editable === "true";
	}
} );

$.extend( $.ui.autocomplete, {
	escapeRegex: function( value ) {
		return value.replace( /[\-\[\]{}()*+?.,\\\^$|#\s]/g, "\\$&" );
	},
	filter: function( array, term ) {
		var matcher = new RegExp( $.ui.autocomplete.escapeRegex( term ), "i" );
		return $.grep( array, function( value ) {
			return matcher.test( value.label || value.value || value );
		} );
	}
} );

// Live region extension, adding a `messages` option
// NOTE: This is an experimental API. We are still investigating
// a full solution for string manipulation and internationalization.
$.widget( "ui.autocomplete", $.ui.autocomplete, {
	options: {
		messages: {
			noResults: "No search results.",
			results: function( amount ) {
				return amount + ( amount > 1 ? " results are" : " result is" ) +
					" available, use up and down arrow keys to navigate.";
			}
		}
	},

__response: function( content ) {
		var message;
		this._superApply( arguments );
		if ( this.options.disabled || this.cancelSearch ) {
			return;
		}
		if ( content && content.length ) {
			message = this.options.messages.results( content.length );
		} else {
			message = this.options.messages.noResults;
		}
		clearTimeout( this.liveRegionTimer );
		this.liveRegionTimer = this._delay( function() {
			this.liveRegion.html( $( "<div>" ).text( message ) );
		}, 100 );
	}
} );

return $.ui.autocomplete;

} );

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