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jQuery implements a simple DIV drag effect

  • 2020-12-22 17:33:24
  • OfStack

This article illustrates jQuery's simple DIV drag effect. To share for your reference, the details are as follows:

Create 1 HTML file, copy the following code into it, modify the jquery file (go to the next one if you don't have one, I used ES7en-1.8.2), and it is ready to run 


<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>Jquery : Drag the mouse DIV</title>
<style type="text/css">
  div#computerMove{
    position:absolute;
    top:50px;
    left:50px;
    width:200px;
    height:30px;
    line-height:30px;
    background-color:#00CCCC;
    text-align:center;
    color:#FFFFFF;
    cursor:default;
  }
</style>
</head>
<body>
  <div id="computerMove"> Click on me and drag </div>
  <script src="jquery-1.8.2.js" type="text/javascript"></script>
  <script type="text/javascript">
    $(document).ready(function(){
      var $div = $("div#computerMove");
      /*  Bind left mouse button hold event  */
      $div.bind("mousedown",function(event){
        /*  Gets the coordinates of the node you want to drag  */
        var offset_x = $(this)[0].offsetLeft;//x coordinates 
        var offset_y = $(this)[0].offsetTop;//y coordinates 
        /*  Gets the coordinates of the current mouse  */
        var mouse_x = event.pageX;
        var mouse_y = event.pageY;
        /*  Bind drag events  */
        /*  Because you might move the mouse out of an element when dragging, you should use global ( document ) element  */
        $(document).bind("mousemove",function(ev){
          /*  Calculate where the mouse has moved  */
          var _x = ev.pageX - mouse_x;
          var _y = ev.pageY - mouse_y;
          /*  Sets the moved element coordinates  */
          var now_x = (offset_x + _x ) + "px";
          var now_y = (offset_y + _y ) + "px";
          /*  Change the location of the target element  */
          $div.css({
            top:now_y,
            left:now_x
          });
        });
      });
      /*  When the left mouse button is released, contact the event binding  */
      $(document).bind("mouseup",function(){
        $(this).unbind("mousemove");
      });
    })
  </script>
</body>
</html>

For more information about jQuery, please refer to: Summary of jQuery Dragging Effects and Techniques, Summary of jQuery Extension Techniques, Summary of jQuery Common Classic Effects, and Summary of jQuery Animation and Effects Usage.

I hope this article has been helpful in jQuery programming.

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