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jQuery implements simple drag effect

小云云

Jan 04, 2018 pm 02:18 PM

jquery Effect

This article mainly introduces you to the relevant information about using jQuery to achieve a simple drag effect. Recently, I found that the drag effect of a website is very good. I personally think it is a good user experience. I took the time to study it and it is necessary. Friends can refer to it. Let’s take a look at the detailed introduction with the editor.

Preface

This article mainly introduces you to a simple drag effect achieved by using jQuery, and shares it for your reference and study. I won’t say much below, let’s take a look at the detailed introduction. Bar.

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How to pull elements from one box to another box?

Implementation ideas

The events included in this operation are mousedown mousemove mouseup. Monitor these three events and perform corresponding operations.
The nodes of the operation design are: original node, temporary node, new node
The movement of the node involves the coordinates of event e
The operation elements are implemented using JQUERY

The corresponding comments have been reflected in the article, please read it carefully, you can understand it.

<!DOCTYPE html>
<html>
<head>
 <meta charset="UTF-8">
 <title>拖拽</title>
 <style>
 .container ul{
 width: 350px;
 padding: 15px;
 min-height:300px;
 background-color:#FFFFF0;
 margin:20px;
 display: inline-block;
 border-radius: 5px;
 border: 1px solid #bbb;
 }
 .container ul li{
 display: block;
 float: left;
 width: 350px;
 height: 35px;
 line-height: 35px;
 border-radius: 4px;
 margin: 0;
 padding: 0;
 list-style: none;
 background-color:#EED2EE;
 margin-bottom:10px;
 -moz-user-select: none;
 user-select: none;
 text-indent: 10px;
 color: #555;
}
</style>
</head>
<body>


 <p class="container">

 <ul>
 <li>A</li>
 <li>B</li>
 <li>C</li>
 <li>e</li>
 <li>f</li>
 <li>g</li>
 </ul>

 <ul></ul>

 <ul></ul>

</p>
<script src="http://apps.bdimg.com/libs/jquery/2.1.4/jquery.min.js" type="text/javascript"></script>
<!-- <script src="http://www.jq22.com/jquery/jquery-1.10.2.js"></script> -->
<script type="text/javascript">

 $(function(){
 //出入允许拖拽节点的父容器，一般是ul外层的容器
 drag.init('container');
 });

//拖拽
var drag = {

 class_name : null, //允许放置的容器
 permitDrag : false, //是否允许移动标识

 _x : 0,    //节点x坐标
 _y : 0,     //节点y坐标
 _left : 0,   //光标与节点坐标的距离
 _top : 0,   //光标与节点坐标的距离

 old_elm : null,  //拖拽原节点
 tmp_elm : null,  //跟随光标移动的临时节点
 new_elm : null,  //拖拽完成后添加的新节点

 //初始化
 init : function (className){

  //允许拖拽节点的父容器的classname(可按照需要，修改为id或其他)
  drag.class_name = className;

  //监听鼠标按下事件，动态绑定要拖拽的节点（因为节点可能是动态添加的）
  $('.' + drag.class_name).on('mousedown', 'ul li', function(event){
   //当在允许拖拽的节点上监听到点击事件，将标识设置为可以拖拽
   drag.permitDrag = true;
   //获取到拖拽的原节点对象
   drag.old_elm = $(this);
   //执行开始拖拽的操作
   drag.mousedown(event);
   return false;
  });

  //监听鼠标移动
  $(document).mousemove(function(event){
   //判断拖拽标识是否为允许，否则不进行操作
   if(!drag.permitDrag) return false;
   //执行移动的操作
   drag.mousemove(event);
   return false;
  });

  //监听鼠标放开
  $(document).mouseup(function(event){
  //判断拖拽标识是否为允许，否则不进行操作
  if(!drag.permitDrag) return false;
  //拖拽结束后恢复标识到初始状态
  drag.permitDrag = false;
  //执行拖拽结束后的操作
  drag.mouseup(event);
  return false;
  });
 },

 //按下鼠标 执行的操作
 mousedown : function (event){

 //1.克隆临时节点，跟随鼠标进行移动
 drag.tmp_elm = $(drag.old_elm).clone();

 //2.计算 节点 和 光标 的坐标
 drag._x = $(drag.old_elm).offset().left;
 drag._y = $(drag.old_elm).offset().top;

 var e = event || window.event;
 drag._left = e.pageX - drag._x;
 drag._top = e.pageY - drag._y;

 //3.修改克隆节点的坐标，实现跟随鼠标进行移动的效果
 $(drag.tmp_elm).css({
  'position' : 'absolute',
  'background-color' : '#FF8C69',
  'left' : drag._x,
  'top' : drag._y,
 });

 //4.添加临时节点
 tmp = $(drag.old_elm).parent().append(drag.tmp_elm);
 drag.tmp_elm = $(tmp).find(drag.tmp_elm);
 $(drag.tmp_elm).css('cursor', 'move');

 },

 //移动鼠标 执行的操作
 mousemove : function (event){

 //2.计算坐标
 var e = event || window.event;
 var x = e.pageX - drag._left;
 var y = e.pageY - drag._top;
 var maxL = $(document).width() - $(drag.old_elm).outerWidth();
 var maxT = $(document).height() - $(drag.old_elm).outerHeight();
 //不允许超出浏览器范围
 x = x < 0 ? 0: x;
 x = x > maxL ? maxL: x;
 y = y < 0 ? 0: y;
 y = y > maxT ? maxT: y;

 //3.修改克隆节点的坐标
 $(drag.tmp_elm).css({
  'left' : x,
  'top' : y,
 });

 //判断当前容器是否允许放置节点
 $.each($('.' + drag.class_name + ' ul'), function(index, value){

  //获取容器的坐标范围 (区域)
  var box_x = $(value).offset().left;  //容器左上角x坐标
  var box_y = $(value).offset().top;  //容器左上角y坐标
  var box_width = $(value).outerWidth(); //容器宽
  var box_height = $(value).outerHeight();//容器高

  //给可以放置的容器加背景色
  if(e.pageX > box_x && e.pageX < box_x+box_width && e.pageY > box_y && e.pageY < box_y+box_height){

   //判断是否不在原来的容器下（使用坐标进行判断：x、y任意一个坐标不等于原坐标，则表示不是原来的容器）
   if($(value).offset().left !== drag.old_elm.parent().offset().left 
    || $(value).offset().top !== drag.old_elm.parent().offset().top){

    $(value).css(&#39;background-color&#39;, &#39;#FFEFD5&#39;);
   }
  }else{
   //恢复容器原背景色
   $(value).css(&#39;background-color&#39;, &#39;#FFFFF0&#39;);
  }

  });

 },

 //放开鼠标 执行的操作
 mouseup : function (event){
 //移除临时节点
 $(drag.tmp_elm).remove();

 //判断所在区域是否允许放置节点
 var e = event || window.event;

 $.each($(&#39;.&#39; + drag.class_name + &#39; ul&#39;), function(index, value){

  //获取容器的坐标范围 (区域)
  var box_x = $(value).offset().left;  //容器左上角x坐标
  var box_y = $(value).offset().top;  //容器左上角y坐标
  var box_width = $(value).outerWidth(); //容器宽
  var box_height = $(value).outerHeight();//容器高

  //判断放开鼠标位置是否想允许放置的容器范围内
  if(e.pageX > box_x && e.pageX < box_x-0+box_width && e.pageY > box_y && e.pageY < box_y-0+box_height){

   //判断是否不在原来的容器下（使用坐标进行判断：x、y任意一个坐标不等于原坐标，则表示不是原来的容器）
   if($(value).offset().left !== drag.old_elm.parent().offset().left 
    || $(value).offset().top !== drag.old_elm.parent().offset().top){
    //向目标容器添加节点并删除原节点
    tmp = $(drag.old_elm).clone();
    var newObj = $(value).append(tmp);
    $(drag.old_elm).remove();
    //获取新添加节点的对象
    drag.new_elm = $(newObj).find(tmp);
    }
   }
  //恢复容器原背景色
  $(value).css('background-color', '#FFFFF0');
  });

 },

 };

 </script>

</body>
</html>

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