[jQuery] 两个ul之间li元素的拖拉和排序

HTML代码：

<span class="left">
<b>one</b>
<ul id="list1" style="background-color:#ffee00" name="offJob">
<li>1</li>
<li>2</li>
<li>3</li>
<li>4</li>
<li>5</li>
</ul>
</span>
<span class="left">
<b>two</b>
<ul id="list2" style="background-color:#ffee00" name="onJob">
<li>6</li>
<li>7</li>
<li>8</li>
<li>9</li>
<li>0</li>
</ul>
</span>

jQuery代码：

$(function()
{
$("#list1, #list2").dragsort({
dragBetween: true
});
}
);


需要包含的js文件内容：

(function($) {

$.fn.dragsort = function(options) {
var opts = $.extend({}, $.fn.dragsort.defaults, options);
var lists = new Array();
var list = null, lastPos = null;

this.each(function(i, cont) {

var newList = {
draggedItem: null,
placeHolderItem: null,
pos: null,
offset: null,
offsetLimit: null,
container: cont,

init: function() {
$(this.container).attr("listIdx", i).find(opts.dragSelector).css("cursor", "pointer").mousedown(this.grabItem);
},

grabItem: function(e) {
if (e.button == 2)
return;
 
if (list != null && list.draggedItem != null)
list.dropItem();

$(this).css("cursor", "move");

list = lists[$(this).parents("*[listIdx]").attr("listIdx")];
list.draggedItem = $(this).is(opts.itemSelector) ? $(this) : $(this).parents(opts.itemSelector);
list.offset = list.draggedItem.offset();
list.offset.top = e.pageY - list.offset.top;
list.offset.left = e.pageX - list.offset.left;

var containerHeight = $(list.container).outerHeight() == 0 ?Math.max(1, Math.round(0.5 +$(list.container).find(opts.itemSelector).size() *list.draggedItem.outerWidth() / $(list.container).outerWidth())) *list.draggedItem.outerHeight() : $(list.container).outerHeight();
list.offsetLimit = $(list.container).offset();
list.offsetLimit.right = list.offsetLimit.left + $(list.container).outerWidth() - list.draggedItem.outerWidth();
list.offsetLimit.bottom = list.offsetLimit.top + containerHeight - list.draggedItem.outerHeight();

list.placeHolderItem =list.draggedItem.clone().html("&nbsp;").css({ visibility: "hidden",height: list.draggedItem.height() }).attr("placeHolder", true);
list.draggedItem.after(list.placeHolderItem);
list.draggedItem.css({ position: "absolute", opacity: 0.8 });

$(lists).each(function(i, l) { l.ensureNotEmpty(); l.buildPositionTable(); });

list.setPos(e.pageX, e.pageY);
$(document).bind("selectstart", list.stopBubble); //stop ie text selection
$(document).bind("mousemove", list.swapItems);
$(document).bind("mouseup", list.dropItem);
return false; //stop moz text selection
},

setPos: function(x, y) {
var top = y - this.offset.top;
var left = x - this.offset.left;

if (!opts.dragBetween) {
top = Math.min(this.offsetLimit.bottom, Math.max(top, this.offsetLimit.top));
left = Math.min(this.offsetLimit.right, Math.max(left, this.offsetLimit.left));
}

this.draggedItem.css({ top: top, left: left });
},

buildPositionTable: function() {
var item = this.draggedItem == null ? null : this.draggedItem.get(0);
var pos = new Array();
$(this.container).find(opts.itemSelector).each(function(i, elm) {
if (elm != item) {
var loc = $(elm).offset();
loc.right = loc.left + $(elm).width();
loc.bottom = loc.top + $(elm).height();
loc.elm = elm;
pos.push(loc);
}
});
this.pos = pos;
},

dropItem: function() {
if (list.draggedItem == null)
return;

$(list.container).find(opts.dragSelector).css("cursor", "pointer");
list.placeHolderItem.before(list.draggedItem);

list.draggedItem.css({ position: "", top: "", left: "", opacity: "" });
list.placeHolderItem.remove();
 
$("*[emptyPlaceHolder]").remove();

opts.dragEnd.apply(list.draggedItem);
list.draggedItem = null;
$(document).unbind("selectstart", list.stopBubble);
$(document).unbind("mousemove", list.swapItems);
$(document).unbind("mouseup", list.dropItem);
return false;
},

stopBubble: function() { return false; },

swapItems: function(e) {
if (list.draggedItem == null)
return false;

list.setPos(e.pageX, e.pageY);

var ei = list.findPos(e.pageX, e.pageY);
var nlist = list;
for (var i = 0; ei == -1 && opts.dragBetween && i < lists.length; i++) {
ei = lists[i].findPos(e.pageX, e.pageY);
nlist = lists[i];
}

if (ei == -1 || $(nlist.pos[ei].elm).attr("placeHolder"))
return false;

if (lastPos == null || lastPos.top > list.draggedItem.offset().top || lastPos.left > list.draggedItem.offset().left)
$(nlist.pos[ei].elm).before(list.placeHolderItem);
else
$(nlist.pos[ei].elm).after(list.placeHolderItem);

$(lists).each(function(i, l) { l.ensureNotEmpty(); l.buildPositionTable(); });
lastPos = list.draggedItem.offset();
return false;
},

findPos: function(x, y) {
for (var i = 0; i < this.pos.length; i++) {
if (this.pos[i].left < x && this.pos[i].right > x&& this.pos[i].top < y && this.pos[i].bottom > y)
return i;
}
return -1;
},
 
ensureNotEmpty: function() {
if (!opts.dragBetween)
return;

var item = this.draggedItem == null ? null : this.draggedItem.get(0);
var emptyPH = null, empty = true;
 
$(this.container).find(opts.itemSelector).each(function(i, elm) {
if ($(elm).attr("emptyPlaceHolder"))
emptyPH = elm;
else if (elm != item)
empty = false;
});
 
if (empty && emptyPH == null)
$(this.container).append(list.placeHolderItem.clone().removeAttr("placeHolder").attr("emptyPlaceHolder", true));
else if (!empty && emptyPH != null)
$(emptyPH).remove();
}
};

newList.init();
lists.push(newList);
});

return this;
};

$.fn.dragsort.defaults = {
itemSelector: "li",
dragSelector: "li",
dragEnd: function() { },
dragBetween: false
};

})(jQuery);