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/*!
 * jQuery UI Selectmenu 1.14.2
 * https://jqueryui.com
 *
 * Copyright OpenJS Foundation and other contributors
 * Released under the MIT license.
 * https://jquery.org/license
 */

//>>label: Selectmenu
//>>group: Widgets
//>>description: Duplicates and extends the functionality of a native HTML select element, allowing it to be customizable in behavior and appearance far beyond the limitations of a native select.
//>>docs: https://api.jqueryui.com/selectmenu/
//>>demos: https://jqueryui.com/selectmenu/
//>>css.structure: ../../themes/base/core.css
//>>css.structure: ../../themes/base/selectmenu.css, ../../themes/base/button.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",
			"../form-reset-mixin",
			"../keycode",
			"../labels",
			"../position",
			"../unique-id",
			"../version",
			"../widget"
		], factory );
	} else {

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

return $.widget( "ui.selectmenu", [ $.ui.formResetMixin, {
	version: "1.14.2",
	defaultElement: "<select>",
	options: {
		appendTo: null,
		classes: {
			"ui-selectmenu-button-open": "ui-corner-top",
			"ui-selectmenu-button-closed": "ui-corner-all"
		},
		disabled: null,
		icons: {
			button: "ui-icon-triangle-1-s"
		},
		position: {
			my: "left top",
			at: "left bottom",
			collision: "none"
		},
		width: false,

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

_create: function() {
		var selectmenuId = this.element.uniqueId().attr( "id" );
		this.ids = {
			element: selectmenuId,
			button: selectmenuId + "-button",
			menu: selectmenuId + "-menu"
		};

this._drawButton();
		this._drawMenu();
		this._bindFormResetHandler();

this._rendered = false;
		this.menuItems = $();
	},

_drawButton: function() {
		var icon,
			that = this,
			item = this._parseOption(
				this.element.find( "option:selected" ),
				this.element[ 0 ].selectedIndex
			);

// Associate existing label with the new button
		this.labels = this.element.labels().attr( "for", this.ids.button );
		this._on( this.labels, {
			click: function( event ) {
				this.button.trigger( "focus" );
				event.preventDefault();
			}
		} );

// Hide original select element
		this.element.hide();

// Create button
		this.button = $( "<span>", {
			tabindex: this.options.disabled ? -1 : 0,
			id: this.ids.button,
			role: "combobox",
			"aria-expanded": "false",
			"aria-autocomplete": "list",
			"aria-owns": this.ids.menu,
			"aria-haspopup": "true",
			title: this.element.attr( "title" )
		} )
			.insertAfter( this.element );

this._addClass( this.button, "ui-selectmenu-button ui-selectmenu-button-closed",
			"ui-button ui-widget" );

icon = $( "<span>" ).appendTo( this.button );
		this._addClass( icon, "ui-selectmenu-icon", "ui-icon " + this.options.icons.button );
		this.buttonItem = this._renderButtonItem( item )
			.appendTo( this.button );

if ( this.options.width !== false ) {
			this._resizeButton();
		}

this._on( this.button, this._buttonEvents );
		this.button.one( "focusin", function() {

// Delay rendering the menu items until the button receives focus.
			// The menu may have already been rendered via a programmatic open.
			if ( !that._rendered ) {
				that._refreshMenu();
			}
		} );
	},

_drawMenu: function() {
		var that = this;

// Create menu
		this.menu = $( "<ul>", {
			"aria-hidden": "true",
			"aria-labelledby": this.ids.button,
			id: this.ids.menu
		} );

// Wrap menu
		this.menuWrap = $( "<div>" ).append( this.menu );
		this._addClass( this.menuWrap, "ui-selectmenu-menu", "ui-front" );
		this.menuWrap.appendTo( this._appendTo() );

// Initialize menu widget
		this.menuInstance = this.menu
			.menu( {
				classes: {
					"ui-menu": "ui-corner-bottom"
				},
				role: "listbox",
				select: function( event, ui ) {
					event.preventDefault();
					that._select( ui.item.data( "ui-selectmenu-item" ), event );
				},
				focus: function( event, ui ) {
					var item = ui.item.data( "ui-selectmenu-item" );

// Prevent inital focus from firing and check if its a newly focused item
					if ( that.focusIndex != null && item.index !== that.focusIndex ) {
						that._trigger( "focus", event, { item: item } );
						if ( !that.isOpen ) {
							that._select( item, event );
						}
					}
					that.focusIndex = item.index;

that.button.attr( "aria-activedescendant",
						that.menuItems.eq( item.index ).attr( "id" ) );
				}
			} )
			.menu( "instance" );

// Don't close the menu on mouseleave
		this.menuInstance._off( this.menu, "mouseleave" );

// Cancel the menu's collapseAll on document click
		this.menuInstance._closeOnDocumentClick = function() {
			return false;
		};

// Selects often contain empty items, but never contain dividers
		this.menuInstance._isDivider = function() {
			return false;
		};
	},

refresh: function() {
		this._refreshMenu();
		this.buttonItem.replaceWith(
			this.buttonItem = this._renderButtonItem(

// Fall back to an empty object in case there are no options
				this._getSelectedItem().data( "ui-selectmenu-item" ) || {}
			)
		);
		if ( this.options.width === null ) {
			this._resizeButton();
		}
	},

_refreshMenu: function() {
		var item,
			options = this.element.find( "option" );

this.menu.empty();

this._parseOptions( options );
		this._renderMenu( this.menu, this.items );

this.menuInstance.refresh();
		this.menuItems = this.menu.find( "li" )
			.not( ".ui-selectmenu-optgroup" )
				.find( ".ui-menu-item-wrapper" );

this._rendered = true;

if ( !options.length ) {
			return;
		}

item = this._getSelectedItem();

// Update the menu to have the correct item focused
		this.menuInstance.focus( null, item );
		this._setAria( item.data( "ui-selectmenu-item" ) );

// Set disabled state
		this._setOption( "disabled", this.element.prop( "disabled" ) );
	},

open: function( event ) {
		if ( this.options.disabled ) {
			return;
		}

// If this is the first time the menu is being opened, render the items
		if ( !this._rendered ) {
			this._refreshMenu();
		} else {

// Menu clears focus on close, reset focus to selected item
			this._removeClass( this.menu.find( ".ui-state-active" ), null, "ui-state-active" );
			this.menuInstance.focus( null, this._getSelectedItem() );
		}

// If there are no options, don't open the menu
		if ( !this.menuItems.length ) {
			return;
		}

this.isOpen = true;
		this._toggleAttr();
		this._resizeMenu();
		this._position();

this._on( this.document, this._documentClick );

this._trigger( "open", event );
	},

_position: function() {
		this.menuWrap.position( $.extend( { of: this.button }, this.options.position ) );
	},

close: function( event ) {
		if ( !this.isOpen ) {
			return;
		}

this.isOpen = false;
		this._toggleAttr();

this.range = null;
		this._off( this.document );

this._trigger( "close", event );
	},

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

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

_renderButtonItem: function( item ) {
		var buttonItem = $( "<span>" );

this._setText( buttonItem, item.label );
		this._addClass( buttonItem, "ui-selectmenu-text" );

return buttonItem;
	},

_renderMenu: function( ul, items ) {
		var that = this,
			currentOptgroup = "";

$.each( items, function( index, item ) {
			var li;

if ( item.optgroup !== currentOptgroup ) {
				li = $( "<li>", {
					text: item.optgroup
				} );
				that._addClass( li, "ui-selectmenu-optgroup", "ui-menu-divider" +
					( item.element.parent( "optgroup" ).prop( "disabled" ) ?
						" ui-state-disabled" :
						"" ) );

li.appendTo( ul );

currentOptgroup = item.optgroup;
			}

that._renderItemData( ul, item );
		} );
	},

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

_renderItem: function( ul, item ) {
		var li = $( "<li>" ),
			wrapper = $( "<div>", {
				title: item.element.attr( "title" )
			} );

if ( item.disabled ) {
			this._addClass( li, null, "ui-state-disabled" );
		}

if ( item.hidden ) {
			li.prop( "hidden", true );
		} else {
			this._setText( wrapper, item.label );
		}

return li.append( wrapper ).appendTo( ul );
	},

_setText: function( element, value ) {
		if ( value ) {
			element.text( value );
		} else {
			element.html( "&#160;" );
		}
	},

_move: function( direction, event ) {
		var item, next,
			filter = ".ui-menu-item";

if ( this.isOpen ) {
			item = this.menuItems.eq( this.focusIndex ).parent( "li" );
		} else {
			item = this.menuItems.eq( this.element[ 0 ].selectedIndex ).parent( "li" );
			filter += ":not(.ui-state-disabled)";
		}

if ( direction === "first" || direction === "last" ) {
			next = item[ direction === "first" ? "prevAll" : "nextAll" ]( filter ).eq( -1 );
		} else {
			next = item[ direction + "All" ]( filter ).eq( 0 );
		}

if ( next.length ) {
			this.menuInstance.focus( event, next );
		}
	},

_getSelectedItem: function() {
		return this.menuItems.eq( this.element[ 0 ].selectedIndex ).parent( "li" );
	},

_toggle: function( event ) {
		this[ this.isOpen ? "close" : "open" ]( event );
	},

_setSelection: function() {
		var selection;

if ( !this.range ) {
			return;
		}

selection = window.getSelection();
		selection.removeAllRanges();
		selection.addRange( this.range );
	},

_documentClick: {
		mousedown: function( event ) {
			if ( !this.isOpen ) {
				return;
			}

if ( !$( event.target ).closest( ".ui-selectmenu-menu, #" +
				CSS.escape( this.ids.button ) ).length ) {
				this.close( event );
			}
		}
	},

_buttonEvents: {

// Prevent text selection from being reset when interacting with the selectmenu (#10144)
		mousedown: function() {
			var selection = window.getSelection();
			if ( selection.rangeCount ) {
				this.range = selection.getRangeAt( 0 );
			}
		},

click: function( event ) {
			this._setSelection();
			this._toggle( event );
		},

keydown: function( event ) {
			var preventDefault = true;
			switch ( event.keyCode ) {
			case $.ui.keyCode.TAB:
			case $.ui.keyCode.ESCAPE:
				this.close( event );
				preventDefault = false;
				break;
			case $.ui.keyCode.ENTER:
				if ( this.isOpen ) {
					this._selectFocusedItem( event );
				}
				break;
			case $.ui.keyCode.UP:
				if ( event.altKey ) {
					this._toggle( event );
				} else {
					this._move( "prev", event );
				}
				break;
			case $.ui.keyCode.DOWN:
				if ( event.altKey ) {
					this._toggle( event );
				} else {
					this._move( "next", event );
				}
				break;
			case $.ui.keyCode.SPACE:
				if ( this.isOpen ) {
					this._selectFocusedItem( event );
				} else {
					this._toggle( event );
				}
				break;
			case $.ui.keyCode.LEFT:
				this._move( "prev", event );
				break;
			case $.ui.keyCode.RIGHT:
				this._move( "next", event );
				break;
			case $.ui.keyCode.HOME:
			case $.ui.keyCode.PAGE_UP:
				this._move( "first", event );
				break;
			case $.ui.keyCode.END:
			case $.ui.keyCode.PAGE_DOWN:
				this._move( "last", event );
				break;
			default:
				this.menu.trigger( event );
				preventDefault = false;
			}

if ( preventDefault ) {
				event.preventDefault();
			}
		}
	},

_selectFocusedItem: function( event ) {
		var item = this.menuItems.eq( this.focusIndex ).parent( "li" );
		if ( !item.hasClass( "ui-state-disabled" ) ) {
			this._select( item.data( "ui-selectmenu-item" ), event );
		}
	},

_select: function( item, event ) {
		var oldIndex = this.element[ 0 ].selectedIndex;

// Change native select element
		this.element[ 0 ].selectedIndex = item.index;
		this.buttonItem.replaceWith( this.buttonItem = this._renderButtonItem( item ) );
		this._setAria( item );
		this._trigger( "select", event, { item: item } );

if ( item.index !== oldIndex ) {
			this._trigger( "change", event, { item: item } );
		}

this.close( event );
	},

_setAria: function( item ) {
		var id = this.menuItems.eq( item.index ).attr( "id" );

this.button.attr( {
			"aria-labelledby": id,
			"aria-activedescendant": id
		} );
		this.menu.attr( "aria-activedescendant", id );
	},

_setOption: function( key, value ) {
		if ( key === "icons" ) {
			var icon = this.button.find( "span.ui-icon" );
			this._removeClass( icon, null, this.options.icons.button )
				._addClass( icon, null, value.button );
		}

this._super( key, value );

if ( key === "appendTo" ) {
			this.menuWrap.appendTo( this._appendTo() );
		}

if ( key === "width" ) {
			this._resizeButton();
		}
	},

_setOptionDisabled: function( value ) {
		this._super( value );

this.menuInstance.option( "disabled", value );
		this.button.attr( "aria-disabled", value );
		this._toggleClass( this.button, null, "ui-state-disabled", value );

this.element.prop( "disabled", value );
		if ( value ) {
			this.button.attr( "tabindex", -1 );
			this.close();
		} else {
			this.button.attr( "tabindex", 0 );
		}
	},

_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;
	},

_toggleAttr: function() {
		this.button.attr( "aria-expanded", this.isOpen );

// We can't use two _toggleClass() calls here, because we need to make sure
		// we always remove classes first and add them second, otherwise if both classes have the
		// same theme class, it will be removed after we add it.
		this._removeClass( this.button, "ui-selectmenu-button-" +
			( this.isOpen ? "closed" : "open" ) )
			._addClass( this.button, "ui-selectmenu-button-" +
				( this.isOpen ? "open" : "closed" ) )
			._toggleClass( this.menuWrap, "ui-selectmenu-open", null, this.isOpen );

this.menu.attr( "aria-hidden", !this.isOpen );
	},

_resizeButton: function() {
		var width = this.options.width;

// For `width: false`, just remove inline style and stop
		if ( width === false ) {
			this.button.css( "width", "" );
			return;
		}

// For `width: null`, match the width of the original element
		if ( width === null ) {
			width = this.element.show().outerWidth();
			this.element.hide();
		}

this.button.outerWidth( width );
	},

_resizeMenu: function() {
		this.menu.outerWidth( Math.max(
			this.button.outerWidth(),
			this.menu.width( "" ).outerWidth()
		) );
	},

_getCreateOptions: function() {
		var options = this._super();

options.disabled = this.element.prop( "disabled" );

return options;
	},

_parseOptions: function( options ) {
		var that = this,
			data = [];
		options.each( function( index, item ) {
			data.push( that._parseOption( $( item ), index ) );
		} );
		this.items = data;
	},

_parseOption: function( option, index ) {
		var optgroup = option.parent( "optgroup" );

return {
			element: option,
			index: index,
			value: option.val(),
			label: option.text(),
			hidden: optgroup.prop( "hidden" ) || option.prop( "hidden" ),
			optgroup: optgroup.attr( "label" ) || "",
			disabled: optgroup.prop( "disabled" ) || option.prop( "disabled" )
		};
	},

_destroy: function() {
		this._unbindFormResetHandler();
		this.menuWrap.remove();
		this.button.remove();
		this.element.show();
		this.element.removeUniqueId();
		this.labels.attr( "for", this.ids.element );
	}
} ] );

} );

Editing: selectmenu.js

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