Merge branch 'master' of https://github.com/RubaXa/Sortable

Author: why520crazy

CONTRIBUTING.md

@@ -3,7 +3,7 @@
 ### Issue
 
  1. Try [dev](https://github.com/RubaXa/Sortable/tree/dev/)-branch, perhaps the problem has been solved;
- 2. [Use the search](https://github.com/RubaXa/Sortable/search?q=problem), maybe already have an answer;
+ 2. [Use the search](https://github.com/RubaXa/Sortable/search?type=Issues&q=problem), maybe already have an answer;
  3. If not found, create example on [jsbin.com (draft)](http://jsbin.com/zunibaxada/1/edit?html,js,output) and describe the problem.
 
 ---

README.md

@@ -476,7 +476,7 @@ Other attributes are:
 ### Support Polymer
 ```html
 
-<link rel="import" href="bower_components/Sortable/Sortable-js.html">
+<link rel="import" href="bower_components/Sortable/Sortable.html">
 
 <sortable-js handle=".handle">
   <template is="dom-repeat" items={{names}}>

Sortable.js

@@ -23,6 +23,12 @@
 	}
 })(function () {
 	"use strict";
+	
+	if (typeof window == "undefined" || typeof window.document == "undefined") {
+		return function() {
+			throw new Error( "Sortable.js requires a window with a document" );
+		}
+	}
 
 	var dragEl,
 		parentEl,
@@ -273,7 +279,7 @@
 			}
 
 			// get the index of the dragged element within its parent
-			oldIndex = _index(target);
+			oldIndex = _index(target, options.draggable);
 
 			// Check filter
 			if (typeof filter === 'function') {
@@ -769,7 +775,7 @@
 					_toggleClass(dragEl, this.options.chosenClass, false);
 
 					if (rootEl !== parentEl) {
-						newIndex = _index(dragEl);
+						newIndex = _index(dragEl, options.draggable);
 
 						if (newIndex >= 0) {
 							// drag from one list and drop into another
@@ -789,7 +795,7 @@
 
 						if (dragEl.nextSibling !== nextEl) {
 							// Get the index of the dragged element within its parent
-							newIndex = _index(dragEl);
+							newIndex = _index(dragEl, options.draggable);
 
 							if (newIndex >= 0) {
 								// drag & drop within the same list
@@ -811,31 +817,34 @@
 					}
 				}
 
-				// Nulling
-				rootEl =
-				dragEl =
-				parentEl =
-				ghostEl =
-				nextEl =
-				cloneEl =
+			}
+			this._nulling();
+		},
 
-				scrollEl =
-				scrollParentEl =
+		_nulling: function() {
+			// Nulling
+			rootEl =
+			dragEl =
+			parentEl =
+			ghostEl =
+			nextEl =
+			cloneEl =
 
-				tapEvt =
-				touchEvt =
+			scrollEl =
+			scrollParentEl =
 
-				moved =
-				newIndex =
+			tapEvt =
+			touchEvt =
 
-				lastEl =
-				lastCSS =
+			moved =
+			newIndex =
 
-				activeGroup =
-				Sortable.active = null;
-			}
-		},
+			lastEl =
+			lastCSS =
 
+			activeGroup =
+			Sortable.active = null;
+		},
 
 		handleEvent: function (/**Event*/evt) {
 			var type = evt.type;
@@ -982,17 +991,11 @@
 	function _closest(/**HTMLElement*/el, /**String*/selector, /**HTMLElement*/ctx) {
 		if (el) {
 			ctx = ctx || document;
-			selector = selector.split('.');
-
-			var tag = selector.shift().toUpperCase(),
-				re = new RegExp('\\s(' + selector.join('|') + ')(?=\\s)', 'g');
 
 			do {
 				if (
-					(tag === '>*' && el.parentNode === ctx) || (
-						(tag === '' || el.nodeName.toUpperCase() == tag) &&
-						(!selector.length || ((' ' + el.className + ' ').match(re) || []).length == selector.length)
-					)
+					(selector === '>*' && el.parentNode === ctx)
+					|| _matches(el, selector)
 				) {
 					return el;
 				}
@@ -1165,26 +1168,45 @@
 	}
 
 	/**
-	 * Returns the index of an element within its parent
+	 * Returns the index of an element within its parent for a selected set of
+	 * elements
 	 * @param  {HTMLElement} el
+	 * @param  {selector} selector
 	 * @return {number}
 	 */
-	function _index(el) {
+	function _index(el, selector) {
 		var index = 0;
 
 		if (!el || !el.parentNode) {
 			return -1;
 		}
 
 		while (el && (el = el.previousElementSibling)) {
-			if (el.nodeName.toUpperCase() !== 'TEMPLATE') {
+			if (el.nodeName.toUpperCase() !== 'TEMPLATE'
+					&& _matches(el, selector)) {
 				index++;
 			}
 		}
 
 		return index;
 	}
 
+	function _matches(/**HTMLElement*/el, /**String*/selector) {
+		if (el) {
+			selector = selector.split('.');
+
+			var tag = selector.shift().toUpperCase(),
+				re = new RegExp('\\s(' + selector.join('|') + ')(?=\\s)', 'g');
+
+			return (
+				(tag === '' || el.nodeName.toUpperCase() == tag) &&
+				(!selector.length || ((' ' + el.className + ' ').match(re) || []).length == selector.length)
+			);
+		}
+
+		return false;
+	}
+
 	function _throttle(callback, ms) {
 		var args, _this;