selectmenu.js

/*!
 * jQuery UI Selectmenu @VERSION
 * http://jqueryui.com
 *
 * Copyright jQuery Foundation and other contributors
 * Released under the MIT license.
 * http://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: http://api.jqueryui.com/selectmenu/
//>>demos: http://jqueryui.com/selectmenu/

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

		// AMD. Register as an anonymous module.
		define([
			"jquery",
			"./core",
			"./widget",
			"./position",
			"./menu"
		], factory );
	} else {

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

return $.widget( "ui.selectmenu", {
	version: "@VERSION",
	defaultElement: "<select>",
	options: {
		appendTo: null,
		disabled: null,
		icons: {
			button: "ui-icon-triangle-1-s"
		},
		position: {
			my: "left top",
			at: "left bottom",
			collision: "none"
		},
		width: null,

		// 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._rendered = false;
		this.menuItems = $();

		if ( this.options.disabled ) {
			this.disable();
		}
	},

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

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

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

		// Create button
		this.button = $( "<span>", {
			"class": "ui-selectmenu-button ui-widget ui-state-default ui-corner-all",
			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 );

		$( "<span>", {
			"class": "ui-icon " + this.options.icons.button
		})
			.prependTo( this.button );

		this.buttonItem = this._renderButtonItem( item )
			.appendTo( this.button );

		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();
			}
		});
		this._hoverable( this.button );
		this._focusable( this.button );
	},

	_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>", {
			"class": "ui-selectmenu-menu ui-front"
		})
			.append( this.menu )
			.appendTo( this._appendTo() );

		// Initialize menu widget
		this.menuInstance = this.menu
			.menu({
				role: "listbox",
				select: function( event, ui ) {
					event.preventDefault();

					// support: IE8
					// If the item was selected via a click, the text selection
					// will be destroyed in IE
					that._setSelection();

					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" );

		// Adjust menu styles to dropdown
		this.menu
			.addClass( "ui-corner-bottom" )
			.removeClass( "ui-corner-all" );

		// 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 ) {
			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.menu.find( ".ui-state-active" ).removeClass( "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>", {
			"class": "ui-selectmenu-text"
		});
		this._setText( buttonItem, item.label );

		return buttonItem;
	},

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

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

		if ( window.getSelection ) {
			selection = window.getSelection();
			selection.removeAllRanges();
			selection.addRange( this.range );

		// support: IE8
		} else {
			this.range.select();
		}

		// support: IE
		// Setting the text selection kills the button focus in IE, but
		// restoring the focus doesn't kill the selection.
		this.button.focus();
	},

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

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

	_buttonEvents: {

		// Prevent text selection from being reset when interacting with the selectmenu (#10144)
		mousedown: function() {
			var selection;

			if ( window.getSelection ) {
				selection = window.getSelection();
				if ( selection.rangeCount ) {
					this.range = selection.getRangeAt( 0 );
				}

			// support: IE8
			} else {
				this.range = document.selection.createRange();
			}
		},

		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" ) {
			this.button.find( "span.ui-icon" )
				.removeClass( this.options.icons.button )
				.addClass( value.button );
		}

		this._super( key, value );

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

		if ( key === "disabled" ) {
			this.menuInstance.option( "disabled", value );
			this.button
				.toggleClass( "ui-state-disabled", value )
				.attr( "aria-disabled", value );

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

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

	_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" );
		}

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

		return element;
	},

	_toggleAttr: function() {
		this.button
			.toggleClass( "ui-corner-top", this.isOpen )
			.toggleClass( "ui-corner-all", !this.isOpen )
			.attr( "aria-expanded", this.isOpen );
		this.menuWrap.toggleClass( "ui-selectmenu-open", this.isOpen );
		this.menu.attr( "aria-hidden", !this.isOpen );
	},

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

		if ( !width ) {
			width = this.element.show().outerWidth();
			this.element.hide();
		}

		this.button.outerWidth( width );
	},

	_resizeMenu: function() {
		this.menu.outerWidth( Math.max(
			this.button.outerWidth(),

			// support: IE10
			// IE10 wraps long text (possibly a rounding bug)
			// so we add 1px to avoid the wrapping
			this.menu.width( "" ).outerWidth() + 1
		) );
	},

	_getCreateOptions: function() {
		return { disabled: this.element.prop( "disabled" ) };
	},

	_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(),
			optgroup: optgroup.attr( "label" ) || "",
			disabled: optgroup.prop( "disabled" ) || option.prop( "disabled" )
		};
	},

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

}));