<!DOCTYPE html>
<html lang="en">
<head>
 <meta charset="UTF-8">
 <title>Document</title>
 <script type="text/javascript" src="jquery.js"></script>
 <script type="text/javascript" src="drag.js"></script>
 <style type="text/css">
 div{
  height: 200px;
  overflow-y: auto;
 }
 ul{
  margin: 0;
  padding: 0;
  list-style: none;
  box-shadow: rgba(0, 0, 0, 0.2) 5px 5px 10px;
  display: inline-block;
 }
 .drag-item{
  width: 100px;
  padding: 0 10px;
  line-height: 38px;
  cursor: move;
 }
 .draging{
  background-color: #ccc !important;
 }
 .no-draging{
  background-color: #fff !important;
 }
 </style>
</head>
<body>
 <ul class="drag-box">

 </ul>
</body>
<script type="text/javascript">
 new Drag({
 container: '.drag-box',
 data: ['應(yīng)用1','應(yīng)用2','應(yīng)用3','應(yīng)用4','應(yīng)用5','應(yīng)用6','應(yīng)用7','應(yīng)用8','應(yīng)用9']
 });
</script>
</html>

js:

(function(win){

 function Drag(opts){
 this.init(opts);
 };

 Drag.prototype = {
 constructor: Drag,

 options: {
  container: '',
  data: [], //可以是數(shù)據(jù)，也可以是html標(biāo)簽
  className: 'item'
 },

 //初始化 
 init: function(opts){
  $.extend(this.options, opts);
  this.$el = $(this.get('container'));
  this._render();
  this._bindEvent();
 },

 get: function(key){
  return this.options[key];
 },

 set: function(key, value){
  this.options[key]=value;
 },

 //渲染列表
 _render: function(){
  var me = this, lis = '',
  data = me.get('data') || [];
  for(var i=0,len=data.length;i<len;i++) lis+='<li class="drag-item" id="drag-item-'+i+'">'+ data[i]+'</li>';
  me.$el.append(lis)
   .find('li').attr('draggable',true)
    .addClass(this.get('className'));
 },

 //綁定事件
 _bindEvent: function(){
  var me = this,
  $lis = $('li', me.$el),
  events = ['dragstart', 'dragenter', 'dragover', 'drop', 'dragend'];
  $.each(events, function(index, item){
  $lis.on(item, function(e){
   me['_'+item+'Handle'] && me['_'+item+'Handle'](e, me);
  });
  })
  $lis.hover(function(){
  $(this).css('background-color','#eee');
  },function(){
  $(this).css('background-color','#fff');
  });
 },

 //開始拖動(dòng)
 _dragstartHandle: function(e){
  var me = this,oe = e.originalEvent;
  if(oe.dataTransfer){
  oe.dataTransfer.setData('text', '');
  }
  me.$drag = $(e.currentTarget);
  $('li',me.$el).removeClass('item-hover');
  me.$drag.addClass('draging').siblings().addClass('no-draging');
 },

 _dragenterHandle: function(e){
  var me = this;
  me.$drop = $(e.currentTarget);
  if(me.timer){clearTimeout(me.timer)} //事件控制
  me.timer = setTimeout(function(){
  if(me.$drag.attr('id') !== me.$drop.attr('id')){
   me._createMask();
   if(me.$drag.index()<me.$drop.index()) me.$drag.insertAfter(me.$drop);
   else me.$drag.insertBefore(me.$drop);
  }
  }, 30);

 },

 _dragoverHandle: function(e){
  var oe = e.originalEvent;
  e.preventDefault();
  return false;
 },

 _dropHandle: function(e){
  e.preventDefault();
  e.stopPropagation();
  return false;
 },

 //拖動(dòng)結(jié)束
 _dragendHandle: function(e){
  var me = this;
  me.$mask && me.$mask.remove();
  setTimeout(function(){
  $('li', me.$el).removeClass('draging no-draging');
  },30);
 },

 //創(chuàng)建遮罩
 _createMask: function(){
  var me = this,$mask = me.$mask = $('<div class="drag-mask"></div>');
  $mask.css({
  position: 'absolute',
  width: me.$drop.outerWidth(),//new
  height: me.$drop.outerHeight(),//new
  left: me.$drop.position().left,
  top: me.$drop.position().top+me.$el.scrollTop(),//new
  backgroundColor: '#fff'
  });
  $mask.on({
  'drop': me._dropHandle,
  'dragover': me._dragoverHandle
  });
  this.$el.find('.drag-mask').remove();
  this.$el.append($mask);
 }

 };

 win.Drag = Drag;
})(window);

踩得坑：

1、關(guān)于dataTransfer, 事件對(duì)象e中是沒有該屬性的，要找該屬性應(yīng)該通過e.originalEvent.dataTransfer中去找。

2、兼容火狐瀏覽器。如果不這樣操作，火狐下是無法運(yùn)行的：

if(oe.dataTransfer){
 oe.dataTransfer.setData('text', '');
}

3、dragover事件每隔 350 毫秒會(huì)被觸發(fā)一次。

4、dragstart、dragenter、dragend事件通過jquery綁定，事件處理函數(shù)中的this指向最外層對(duì)象，例如上面的new Drag()；dragover、drop事件通過jquery綁定，事件處理函數(shù)中的this指向被綁定的html標(biāo)簽。

5、jquery獲取包括padding的寬度調(diào)用：$el.outerWidth()和$el.outerHeight() 。

6、只有屬性draggable="true"的元素才可以被拖動(dòng)。

以上就是本文的全部?jī)?nèi)容，希望對(duì)大家的學(xué)習(xí)有所幫助，也希望大家多多支持腳本之家。

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