ui/core.js

/*!
 * jQuery UI Core @VERSION
 * http://jqueryui.com
 *
 * Copyright jQuery Foundation and other contributors
 * Released under the MIT license.
 * http://jquery.org/license
 *
 */

//>>label: Core
//>>group: UI Core
//>>description: The core of jQuery UI, required for all interactions and widgets.
//>>docs: http://api.jqueryui.com/category/ui-core/
//>>demos: http://jqueryui.com/

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

		// AMD. Register as an anonymous module.
		define( [
			"jquery",
			"./data",
			"./disable-selection",
			"./focusable",
			"./form",
			"./ie",
			"./keycode",
			"./labels",
			"./jquery-1-7",
			"./plugin",
			"./version"
		], factory );
	} else {

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

$.extend( $.ui, {

	// Internal use only
	safeActiveElement: function( document ) {
		var activeElement;

		// Support: IE 9 only
		// IE9 throws an "Unspecified error" accessing document.activeElement from an <iframe>
		try {
			activeElement = document.activeElement;
		} catch ( error ) {
			activeElement = document.body;
		}

		// Support: IE 9 - 11 only
		// IE may return null instead of an element
		// Interestingly, this only seems to occur when NOT in an iframe
		if ( !activeElement ) {
			activeElement = document.body;
		}

		// Support: IE 11 only
		// IE11 returns a seemingly empty object in some cases when accessing
		// document.activeElement from an <iframe>
		if ( !activeElement.nodeName ) {
			activeElement = document.body;
		}

		return activeElement;
	},

	// Internal use only
	safeBlur: function( element ) {

		// Support: IE9 - 10 only
		// If the <body> is blurred, IE will switch windows, see #9420
		if ( element && element.nodeName.toLowerCase() !== "body" ) {
			$( element ).trigger( "blur" );
		}
	}
} );

// plugins
$.fn.extend( {
	scrollParent: function( includeHidden ) {
		var position = this.css( "position" ),
			excludeStaticParent = position === "absolute",
			overflowRegex = includeHidden ? /(auto|scroll|hidden)/ : /(auto|scroll)/,
			scrollParent = this.parents().filter( function() {
				var parent = $( this );
				if ( excludeStaticParent && parent.css( "position" ) === "static" ) {
					return false;
				}
				return overflowRegex.test( parent.css( "overflow" ) + parent.css( "overflow-y" ) + parent.css( "overflow-x" ) );
			} ).eq( 0 );

		return position === "fixed" || !scrollParent.length ? $( this[ 0 ].ownerDocument || document ) : scrollParent;
	},

	uniqueId: ( function() {
		var uuid = 0;

		return function() {
			return this.each( function() {
				if ( !this.id ) {
					this.id = "ui-id-" + ( ++uuid );
				}
			} );
		};
	} )(),

	removeUniqueId: function() {
		return this.each( function() {
			if ( /^ui-id-\d+$/.test( this.id ) ) {
				$( this ).removeAttr( "id" );
			}
		} );
	}
} );

$.extend( $.expr[ ":" ], {
	tabbable: function( element ) {
		var tabIndex = $.attr( element, "tabindex" ),
			hasTabindex = tabIndex != null;
		return ( !hasTabindex || tabIndex >= 0 ) && $.ui.focusable( element, hasTabindex );
	}
} );

} ) );