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Sortable.js
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Sortable.js
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/**!
* Sortable
* @author RubaXa <[email protected]>
* @license MIT
*/
(function sortableModule(factory) {
"use strict";
if (typeof define === "function" && define.amd) {
define(factory);
}
else if (typeof module != "undefined" && typeof module.exports != "undefined") {
module.exports = factory();
}
else if (typeof Package !== "undefined") {
//noinspection JSUnresolvedVariable
Sortable = factory(); // export for Meteor.js
}
else {
/* jshint sub:true */
window["Sortable"] = factory();
}
})(function sortableFactory() {
"use strict";
if (typeof window == "undefined" || !window.document) {
return function sortableError() {
throw new Error("Sortable.js requires a window with a document");
};
}
var dragEl,
parentEl,
ghostEl,
cloneEl,
rootEl,
nextEl,
scrollEl,
scrollParentEl,
scrollCustomFn,
lastEl,
lastCSS,
lastParentCSS,
oldIndex,
newIndex,
activeGroup,
putSortable,
autoScroll = {},
tapEvt,
touchEvt,
moved,
/** @const */
RSPACE = /\s+/g,
expando = 'Sortable' + (new Date).getTime(),
win = window,
document = win.document,
parseInt = win.parseInt,
$ = win.jQuery || win.Zepto,
Polymer = win.Polymer,
supportDraggable = !!('draggable' in document.createElement('div')),
supportCssPointerEvents = (function (el) {
// false when IE11
if (!!navigator.userAgent.match(/Trident.*rv[ :]?11\./)) {
return false;
}
el = document.createElement('x');
el.style.cssText = 'pointer-events:auto';
return el.style.pointerEvents === 'auto';
})(),
_silent = false,
abs = Math.abs,
min = Math.min,
slice = [].slice,
touchDragOverListeners = [],
_autoScroll = _throttle(function (/**Event*/evt, /**Object*/options, /**HTMLElement*/rootEl) {
// Bug: https://bugzilla.mozilla.org/show_bug.cgi?id=505521
if (rootEl && options.scroll) {
var _this = rootEl[expando],
el,
rect,
sens = options.scrollSensitivity,
speed = options.scrollSpeed,
x = evt.clientX,
y = evt.clientY,
winWidth = window.innerWidth,
winHeight = window.innerHeight,
vx,
vy,
scrollOffsetX,
scrollOffsetY
;
// Delect scrollEl
if (scrollParentEl !== rootEl) {
scrollEl = options.scroll;
scrollParentEl = rootEl;
scrollCustomFn = options.scrollFn;
if (scrollEl === true) {
scrollEl = rootEl;
do {
if ((scrollEl.offsetWidth < scrollEl.scrollWidth) ||
(scrollEl.offsetHeight < scrollEl.scrollHeight)
) {
break;
}
/* jshint boss:true */
} while (scrollEl = scrollEl.parentNode);
}
}
if (scrollEl) {
el = scrollEl;
rect = scrollEl.getBoundingClientRect();
vx = (abs(rect.right - x) <= sens) - (abs(rect.left - x) <= sens);
vy = (abs(rect.bottom - y) <= sens) - (abs(rect.top - y) <= sens);
}
if (!(vx || vy)) {
vx = (winWidth - x <= sens) - (x <= sens);
vy = (winHeight - y <= sens) - (y <= sens);
/* jshint expr:true */
(vx || vy) && (el = win);
}
if (autoScroll.vx !== vx || autoScroll.vy !== vy || autoScroll.el !== el) {
autoScroll.el = el;
autoScroll.vx = vx;
autoScroll.vy = vy;
clearInterval(autoScroll.pid);
if (el) {
autoScroll.pid = setInterval(function () {
scrollOffsetY = vy ? vy * speed : 0;
scrollOffsetX = vx ? vx * speed : 0;
if ('function' === typeof(scrollCustomFn)) {
return scrollCustomFn.call(_this, scrollOffsetX, scrollOffsetY, evt);
}
if (el === win) {
win.scrollTo(win.pageXOffset + scrollOffsetX, win.pageYOffset + scrollOffsetY);
} else {
el.scrollTop += scrollOffsetY;
el.scrollLeft += scrollOffsetX;
}
}, 24);
}
}
}
}, 30),
_prepareGroup = function (options) {
function toFn(value, pull) {
if (value === void 0 || value === true) {
value = group.name;
}
if (typeof value === 'function') {
return value;
} else {
return function (to, from) {
var fromGroup = from.options.group.name;
return pull
? value
: value && (value.join
? value.indexOf(fromGroup) > -1
: (fromGroup == value)
);
};
}
}
var group = {};
var originalGroup = options.group;
if (!originalGroup || typeof originalGroup != 'object') {
originalGroup = {name: originalGroup};
}
group.name = originalGroup.name;
group.checkPull = toFn(originalGroup.pull, true);
group.checkPut = toFn(originalGroup.put);
options.group = group;
}
;
/**
* @class Sortable
* @param {HTMLElement} el
* @param {Object} [options]
*/
function Sortable(el, options) {
if (!(el && el.nodeType && el.nodeType === 1)) {
throw 'Sortable: `el` must be HTMLElement, and not ' + {}.toString.call(el);
}
this.el = el; // root element
this.options = options = _extend({}, options);
// Export instance
el[expando] = this;
// Default options
var defaults = {
group: Math.random(),
sort: true,
disabled: false,
store: null,
handle: null,
scroll: true,
scrollSensitivity: 30,
scrollSpeed: 10,
draggable: /[uo]l/i.test(el.nodeName) ? 'li' : '>*',
ghostClass: 'sortable-ghost',
chosenClass: 'sortable-chosen',
dragClass: 'sortable-drag',
ignore: 'a, img',
filter: null,
animation: 0,
setData: function (dataTransfer, dragEl) {
dataTransfer.setData('Text', dragEl.textContent);
},
dropBubble: false,
dragoverBubble: false,
dataIdAttr: 'data-id',
delay: 0,
forceFallback: false,
fallbackClass: 'sortable-fallback',
fallbackOnBody: false,
fallbackTolerance: 0,
fallbackOffset: {x: 0, y: 0}
};
// Set default options
for (var name in defaults) {
!(name in options) && (options[name] = defaults[name]);
}
_prepareGroup(options);
// Bind all private methods
for (var fn in this) {
if (fn.charAt(0) === '_' && typeof this[fn] === 'function') {
this[fn] = this[fn].bind(this);
}
}
// Setup drag mode
this.nativeDraggable = options.forceFallback ? false : supportDraggable;
// Bind events
_on(el, 'mousedown', this._onTapStart);
_on(el, 'touchstart', this._onTapStart);
_on(el, 'pointerdown', this._onTapStart);
if (this.nativeDraggable) {
_on(el, 'dragover', this);
_on(el, 'dragenter', this);
}
touchDragOverListeners.push(this._onDragOver);
// Restore sorting
options.store && this.sort(options.store.get(this));
}
Sortable.prototype = /** @lends Sortable.prototype */ {
constructor: Sortable,
_onTapStart: function (/** Event|TouchEvent */evt) {
var _this = this,
el = this.el,
options = this.options,
type = evt.type,
touch = evt.touches && evt.touches[0],
target = (touch || evt).target,
originalTarget = evt.target.shadowRoot && evt.path[0] || target,
filter = options.filter,
startIndex;
// Don't trigger start event when an element is been dragged, otherwise the evt.oldindex always wrong when set option.group.
if (dragEl) {
return;
}
if (type === 'mousedown' && evt.button !== 0 || options.disabled) {
return; // only left button or enabled
}
if (options.handle && !_closest(originalTarget, options.handle, el)) {
return;
}
target = _closest(target, options.draggable, el);
if (!target) {
return;
}
// Get the index of the dragged element within its parent
startIndex = _index(target, options.draggable);
// Check filter
if (typeof filter === 'function') {
if (filter.call(this, evt, target, this)) {
_dispatchEvent(_this, originalTarget, 'filter', target, el, startIndex);
evt.preventDefault();
return; // cancel dnd
}
}
else if (filter) {
filter = filter.split(',').some(function (criteria) {
criteria = _closest(originalTarget, criteria.trim(), el);
if (criteria) {
_dispatchEvent(_this, criteria, 'filter', target, el, startIndex);
return true;
}
});
if (filter) {
evt.preventDefault();
return; // cancel dnd
}
}
// Prepare `dragstart`
this._prepareDragStart(evt, touch, target, startIndex);
},
_prepareDragStart: function (/** Event */evt, /** Touch */touch, /** HTMLElement */target, /** Number */startIndex) {
var _this = this,
el = _this.el,
options = _this.options,
ownerDocument = el.ownerDocument,
dragStartFn;
if (target && !dragEl && (target.parentNode === el)) {
tapEvt = evt;
rootEl = el;
dragEl = target;
parentEl = dragEl.parentNode;
nextEl = dragEl.nextSibling;
activeGroup = options.group;
oldIndex = startIndex;
this._lastX = (touch || evt).clientX;
this._lastY = (touch || evt).clientY;
dragEl.style['will-change'] = 'transform';
dragStartFn = function () {
// Delayed drag has been triggered
// we can re-enable the events: touchmove/mousemove
_this._disableDelayedDrag();
// Make the element draggable
dragEl.draggable = _this.nativeDraggable;
// Chosen item
_toggleClass(dragEl, options.chosenClass, true);
// Bind the events: dragstart/dragend
_this._triggerDragStart(evt, touch);
// Drag start event
_dispatchEvent(_this, rootEl, 'choose', dragEl, rootEl, oldIndex);
};
// Disable "draggable"
options.ignore.split(',').forEach(function (criteria) {
_find(dragEl, criteria.trim(), _disableDraggable);
});
_on(ownerDocument, 'mouseup', _this._onDrop);
_on(ownerDocument, 'touchend', _this._onDrop);
_on(ownerDocument, 'touchcancel', _this._onDrop);
_on(ownerDocument, 'pointercancel', _this._onDrop);
if (options.delay) {
// If the user moves the pointer or let go the click or touch
// before the delay has been reached:
// disable the delayed drag
_on(ownerDocument, 'mouseup', _this._disableDelayedDrag);
_on(ownerDocument, 'touchend', _this._disableDelayedDrag);
_on(ownerDocument, 'touchcancel', _this._disableDelayedDrag);
_on(ownerDocument, 'mousemove', _this._disableDelayedDrag);
_on(ownerDocument, 'touchmove', _this._disableDelayedDrag);
_on(ownerDocument, 'pointermove', _this._disableDelayedDrag);
_this._dragStartTimer = setTimeout(dragStartFn, options.delay);
} else {
dragStartFn();
}
}
},
_disableDelayedDrag: function () {
var ownerDocument = this.el.ownerDocument;
clearTimeout(this._dragStartTimer);
_off(ownerDocument, 'mouseup', this._disableDelayedDrag);
_off(ownerDocument, 'touchend', this._disableDelayedDrag);
_off(ownerDocument, 'touchcancel', this._disableDelayedDrag);
_off(ownerDocument, 'mousemove', this._disableDelayedDrag);
_off(ownerDocument, 'touchmove', this._disableDelayedDrag);
_off(ownerDocument, 'pointermove', this._disableDelayedDrag);
},
_triggerDragStart: function (/** Event */evt, /** Touch */touch) {
touch = touch || (evt.pointerType == 'touch' ? evt : null);
if (touch) {
// Touch device support
tapEvt = {
target: dragEl,
clientX: touch.clientX,
clientY: touch.clientY
};
this._onDragStart(tapEvt, 'touch');
}
else if (!this.nativeDraggable) {
this._onDragStart(tapEvt, true);
}
else {
_on(dragEl, 'dragend', this);
_on(rootEl, 'dragstart', this._onDragStart);
}
try {
if (document.selection) {
// Timeout neccessary for IE9
setTimeout(function () {
document.selection.empty();
});
} else {
window.getSelection().removeAllRanges();
}
} catch (err) {
}
},
_dragStarted: function () {
if (rootEl && dragEl) {
var options = this.options;
// Apply effect
_toggleClass(dragEl, options.ghostClass, true);
_toggleClass(dragEl, options.dragClass, false);
Sortable.active = this;
// Drag start event
_dispatchEvent(this, rootEl, 'start', dragEl, rootEl, oldIndex);
}
},
_emulateDragOver: function () {
if (touchEvt) {
if (this._lastX === touchEvt.clientX && this._lastY === touchEvt.clientY) {
return;
}
this._lastX = touchEvt.clientX;
this._lastY = touchEvt.clientY;
if (!supportCssPointerEvents) {
_css(ghostEl, 'display', 'none');
}
var target = document.elementFromPoint(touchEvt.clientX, touchEvt.clientY),
parent = target,
i = touchDragOverListeners.length;
if (parent) {
do {
if (parent[expando]) {
while (i--) {
touchDragOverListeners[i]({
clientX: touchEvt.clientX,
clientY: touchEvt.clientY,
target: target,
rootEl: parent
});
}
break;
}
target = parent; // store last element
}
/* jshint boss:true */
while (parent = parent.parentNode);
}
if (!supportCssPointerEvents) {
_css(ghostEl, 'display', '');
}
}
},
_onTouchMove: function (/**TouchEvent*/evt) {
if (tapEvt) {
var options = this.options,
fallbackTolerance = options.fallbackTolerance,
fallbackOffset = options.fallbackOffset,
touch = evt.touches ? evt.touches[0] : evt,
dx = (touch.clientX - tapEvt.clientX) + fallbackOffset.x,
dy = (touch.clientY - tapEvt.clientY) + fallbackOffset.y,
translate3d = evt.touches ? 'translate3d(' + dx + 'px,' + dy + 'px,0)' : 'translate(' + dx + 'px,' + dy + 'px)';
// only set the status to dragging, when we are actually dragging
if (!Sortable.active) {
if (fallbackTolerance &&
min(abs(touch.clientX - this._lastX), abs(touch.clientY - this._lastY)) < fallbackTolerance
) {
return;
}
this._dragStarted();
}
// as well as creating the ghost element on the document body
this._appendGhost();
moved = true;
touchEvt = touch;
_css(ghostEl, 'webkitTransform', translate3d);
_css(ghostEl, 'mozTransform', translate3d);
_css(ghostEl, 'msTransform', translate3d);
_css(ghostEl, 'transform', translate3d);
evt.preventDefault();
}
},
_appendGhost: function () {
if (!ghostEl) {
var rect = dragEl.getBoundingClientRect(),
css = _css(dragEl),
options = this.options,
ghostRect;
ghostEl = dragEl.cloneNode(true);
_toggleClass(ghostEl, options.ghostClass, false);
_toggleClass(ghostEl, options.fallbackClass, true);
_toggleClass(ghostEl, options.dragClass, true);
_css(ghostEl, 'top', rect.top - parseInt(css.marginTop, 10));
_css(ghostEl, 'left', rect.left - parseInt(css.marginLeft, 10));
_css(ghostEl, 'width', rect.width);
_css(ghostEl, 'height', rect.height);
_css(ghostEl, 'opacity', '0.8');
_css(ghostEl, 'position', 'fixed');
_css(ghostEl, 'zIndex', '100000');
_css(ghostEl, 'pointerEvents', 'none');
options.fallbackOnBody && document.body.appendChild(ghostEl) || rootEl.appendChild(ghostEl);
// Fixing dimensions.
ghostRect = ghostEl.getBoundingClientRect();
_css(ghostEl, 'width', rect.width * 2 - ghostRect.width);
_css(ghostEl, 'height', rect.height * 2 - ghostRect.height);
}
},
_onDragStart: function (/**Event*/evt, /**boolean*/useFallback) {
var dataTransfer = evt.dataTransfer,
options = this.options;
this._offUpEvents();
if (activeGroup.checkPull(this, this, dragEl, evt) == 'clone') {
cloneEl = _clone(dragEl);
_css(cloneEl, 'display', 'none');
rootEl.insertBefore(cloneEl, dragEl);
_dispatchEvent(this, rootEl, 'clone', dragEl);
}
_toggleClass(dragEl, options.dragClass, true);
if (useFallback) {
if (useFallback === 'touch') {
// Bind touch events
_on(document, 'touchmove', this._onTouchMove);
_on(document, 'touchend', this._onDrop);
_on(document, 'touchcancel', this._onDrop);
_on(document, 'pointermove', this._onTouchMove);
_on(document, 'pointerup', this._onDrop);
} else {
// Old brwoser
_on(document, 'mousemove', this._onTouchMove);
_on(document, 'mouseup', this._onDrop);
}
this._loopId = setInterval(this._emulateDragOver, 50);
}
else {
if (dataTransfer) {
dataTransfer.effectAllowed = 'move';
options.setData && options.setData.call(this, dataTransfer, dragEl);
}
_on(document, 'drop', this);
setTimeout(this._dragStarted, 0);
}
},
_onDragOver: function (/**Event*/evt) {
var el = this.el,
target,
dragRect,
targetRect,
revert,
options = this.options,
group = options.group,
activeSortable = Sortable.active,
isOwner = (activeGroup === group),
canSort = options.sort;
if (evt.preventDefault !== void 0) {
evt.preventDefault();
!options.dragoverBubble && evt.stopPropagation();
}
moved = true;
if (activeGroup && !options.disabled &&
(isOwner
? canSort || (revert = !rootEl.contains(dragEl)) // Reverting item into the original list
: (
putSortable === this ||
activeGroup.checkPull(this, activeSortable, dragEl, evt) && group.checkPut(this, activeSortable, dragEl, evt)
)
) &&
(evt.rootEl === void 0 || evt.rootEl === this.el) // touch fallback
) {
// Smart auto-scrolling
_autoScroll(evt, options, this.el);
if (_silent) {
return;
}
target = _closest(evt.target, options.draggable, el);
dragRect = dragEl.getBoundingClientRect();
putSortable = this;
if (revert) {
_cloneHide(true);
parentEl = rootEl; // actualization
if (cloneEl || nextEl) {
rootEl.insertBefore(dragEl, cloneEl || nextEl);
}
else if (!canSort) {
rootEl.appendChild(dragEl);
}
return;
}
if ((el.children.length === 0) || (el.children[0] === ghostEl) ||
(el === evt.target) && (target = _ghostIsLast(el, evt))
) {
if (target) {
if (target.animated) {
return;
}
targetRect = target.getBoundingClientRect();
}
_cloneHide(isOwner);
if (_onMove(rootEl, el, dragEl, dragRect, target, targetRect, evt) !== false) {
if (!dragEl.contains(el)) {
el.appendChild(dragEl);
parentEl = el; // actualization
}
this._animate(dragRect, dragEl);
target && this._animate(targetRect, target);
}
}
else if (target && !target.animated && target !== dragEl && (target.parentNode[expando] !== void 0)) {
if (lastEl !== target) {
lastEl = target;
lastCSS = _css(target);
lastParentCSS = _css(target.parentNode);
}
targetRect = target.getBoundingClientRect();
var width = targetRect.right - targetRect.left,
height = targetRect.bottom - targetRect.top,
floating = /left|right|inline/.test(lastCSS.cssFloat + lastCSS.display)
|| (lastParentCSS.display == 'flex' && lastParentCSS['flex-direction'].indexOf('row') === 0),
isWide = (target.offsetWidth > dragEl.offsetWidth),
isLong = (target.offsetHeight > dragEl.offsetHeight),
halfway = (floating ? (evt.clientX - targetRect.left) / width : (evt.clientY - targetRect.top) / height) > 0.5,
nextSibling = target.nextElementSibling,
moveVector = _onMove(rootEl, el, dragEl, dragRect, target, targetRect, evt),
after
;
if (moveVector !== false) {
_silent = true;
setTimeout(_unsilent, 30);
_cloneHide(isOwner);
if (moveVector === 1 || moveVector === -1) {
after = (moveVector === 1);
}
else if (floating) {
var elTop = dragEl.offsetTop,
tgTop = target.offsetTop;
if (elTop === tgTop) {
after = (target.previousElementSibling === dragEl) && !isWide || halfway && isWide;
}
else if (target.previousElementSibling === dragEl || dragEl.previousElementSibling === target) {
after = (evt.clientY - targetRect.top) / height > 0.5;
} else {
after = tgTop > elTop;
}
} else {
after = (nextSibling !== dragEl) && !isLong || halfway && isLong;
}
if (!dragEl.contains(el)) {
if (after && !nextSibling) {
el.appendChild(dragEl);
} else {
target.parentNode.insertBefore(dragEl, after ? nextSibling : target);
}
}
parentEl = dragEl.parentNode; // actualization
this._animate(dragRect, dragEl);
this._animate(targetRect, target);
}
}
}
},
_animate: function (prevRect, target) {
var ms = this.options.animation;
if (ms) {
var currentRect = target.getBoundingClientRect();
_css(target, 'transition', 'none');
_css(target, 'transform', 'translate3d('
+ (prevRect.left - currentRect.left) + 'px,'
+ (prevRect.top - currentRect.top) + 'px,0)'
);
target.offsetWidth; // repaint
_css(target, 'transition', 'all ' + ms + 'ms');
_css(target, 'transform', 'translate3d(0,0,0)');
clearTimeout(target.animated);
target.animated = setTimeout(function () {
_css(target, 'transition', '');
_css(target, 'transform', '');
target.animated = false;
}, ms);
}
},
_offUpEvents: function () {
var ownerDocument = this.el.ownerDocument;
_off(document, 'touchmove', this._onTouchMove);
_off(document, 'pointermove', this._onTouchMove);
_off(ownerDocument, 'mouseup', this._onDrop);
_off(ownerDocument, 'touchend', this._onDrop);
_off(ownerDocument, 'pointerup', this._onDrop);
_off(ownerDocument, 'touchcancel', this._onDrop);
},
_onDrop: function (/**Event*/evt) {
var el = this.el,
options = this.options;
clearInterval(this._loopId);
clearInterval(autoScroll.pid);
clearTimeout(this._dragStartTimer);
// Unbind events
_off(document, 'mousemove', this._onTouchMove);
if (this.nativeDraggable) {
_off(document, 'drop', this);
_off(el, 'dragstart', this._onDragStart);
}
this._offUpEvents();
if (evt) {
if (moved) {
evt.preventDefault();
!options.dropBubble && evt.stopPropagation();
}
ghostEl && ghostEl.parentNode.removeChild(ghostEl);
if (dragEl) {
if (this.nativeDraggable) {
_off(dragEl, 'dragend', this);
}
_disableDraggable(dragEl);
dragEl.style['will-change'] = '';
// Remove class's
_toggleClass(dragEl, this.options.ghostClass, false);
_toggleClass(dragEl, this.options.chosenClass, false);
if (rootEl !== parentEl) {
newIndex = _index(dragEl, options.draggable);
if (newIndex >= 0) {
// Add event
_dispatchEvent(null, parentEl, 'add', dragEl, rootEl, oldIndex, newIndex);
// Remove event
_dispatchEvent(this, rootEl, 'remove', dragEl, rootEl, oldIndex, newIndex);
// drag from one list and drop into another
_dispatchEvent(null, parentEl, 'sort', dragEl, rootEl, oldIndex, newIndex);
_dispatchEvent(this, rootEl, 'sort', dragEl, rootEl, oldIndex, newIndex);
}
}
else {
// Remove clone
cloneEl && cloneEl.parentNode.removeChild(cloneEl);
if (dragEl.nextSibling !== nextEl) {
// Get the index of the dragged element within its parent
newIndex = _index(dragEl, options.draggable);
if (newIndex >= 0) {
// drag & drop within the same list
_dispatchEvent(this, rootEl, 'update', dragEl, rootEl, oldIndex, newIndex);
_dispatchEvent(this, rootEl, 'sort', dragEl, rootEl, oldIndex, newIndex);
}
}
}
if (Sortable.active) {
/* jshint eqnull:true */
if (newIndex == null || newIndex === -1) {
newIndex = oldIndex;
}
_dispatchEvent(this, rootEl, 'end', dragEl, rootEl, oldIndex, newIndex);
// Save sorting
this.save();
}
}
}
this._nulling();
},
_nulling: function() {
rootEl =
dragEl =
parentEl =
ghostEl =
nextEl =
cloneEl =
scrollEl =
scrollParentEl =
tapEvt =
touchEvt =
moved =
newIndex =
lastEl =
lastCSS =
putSortable =
activeGroup =
Sortable.active = null;
},
handleEvent: function (/**Event*/evt) {
var type = evt.type;
if (type === 'dragover' || type === 'dragenter') {
if (dragEl) {
this._onDragOver(evt);
_globalDragOver(evt);
}
}
else if (type === 'drop' || type === 'dragend') {
this._onDrop(evt);
}
},
/**
* Serializes the item into an array of string.
* @returns {String[]}
*/
toArray: function () {
var order = [],
el,
children = this.el.children,
i = 0,
n = children.length,
options = this.options;
for (; i < n; i++) {
el = children[i];
if (_closest(el, options.draggable, this.el)) {
order.push(el.getAttribute(options.dataIdAttr) || _generateId(el));
}
}
return order;
},
/**
* Sorts the elements according to the array.
* @param {String[]} order order of the items
*/
sort: function (order) {
var items = {}, rootEl = this.el;
this.toArray().forEach(function (id, i) {
var el = rootEl.children[i];
if (_closest(el, this.options.draggable, rootEl)) {
items[id] = el;
}
}, this);
order.forEach(function (id) {
if (items[id]) {
rootEl.removeChild(items[id]);
rootEl.appendChild(items[id]);
}
});
},