The jquery plug-in jquery.dragscale.js implements the method of dragging and changing the size of elements (with demo source code download)

The jquery plug-in jquery.dragscale.js implements the method of dragging and changing the size of elements (with demo source code download)_jquery

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Release： 2016-05-16 15:13:38

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The example in this article describes how the jquery plug-in jquery.dragscale.js implements dragging to change the size of elements. Share it with everyone for your reference, the details are as follows:

This plug-in is written by the author of the article. The purpose is to improve the author's js ability and also provide some convenience for some js novices when using the plug-in. Veterans can just fly by leisurely.

This plug-in is designed to realize the currently popular effect of dragging and dropping to change the size of elements. You can set the minimum width and height and maximum width and height of the dragged element according to your actual needs. The overall code is as follows:

<!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=utf-8" />
<title>无标题文档</title>
<style>
*{margin:0;padding:0;}
.box{position:absolute;left:100px;top:100px;border:1px solid #eee;width:150px;height:150px;padding:10px;cursor:move;}
.drag{position:absolute;bottom:3px;right:3px;display:block;width:7px;height:7px;background:url(scale.png) no-repeat}
</style>
<script type="text/javascript" src="jquery-1.7.1.js"></script>
<script type="text/javascript" src="jquery.resizable.js"></script>
</head>
<body>
<div class="box">拖拽我吧！<span class="drag"></span></div>
<script>
$(function(){
  $(".drag").resizable({
    minW : 150,
    minH : 150,
    maxW : 500,
    maxH : 500,
    });
  })
</script>
</body>
</html>

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Plug-in jquery.dragscale.js code:

/*
*resizable 0.1
*Dependenc jquery-1.7.1.js
*/
;(function(a){
  a.fn.resizable = function(options){
    var defaults = { //默认参数
      minW : 150,
      minH : 150,
      maxW : 500,
      maxH : 500,
      }
    var opts = a.extend(defaults, options);
    this.each(function(){
      var obj = a(this);
      obj.mousedown(function(e){
        var e = e || event; //区分IE和其他浏览器事件对象
        var x = e.pageX - obj.position().left; //获取鼠标距离匹配元素的父元素左侧的距离
        var y = e.pageY - obj.position().top; //获取鼠标距离匹配元素的父元素顶端的距离
        $(document).mousemove(function(e){
          var e = e || event;
          var _x = e.pageX - x; //动态获取匹配元素距离其父元素左侧的宽度
          var _y = e.pageY - y;
          _x = _x < opts.minW &#63; opts.minW : _x; //保证匹配元素的最小宽度为150px
          _x = _x > opts.maxW &#63; opts.maxW : _x; //保证匹配元素的最大宽度为500px
          _y = _y < opts.minH &#63; opts.minH : _y;
          _y = _y > opts.maxH &#63; opts.maxH : _y;
          obj.parent().css({width:_x,height:_y});
        }).mouseup(function(){
          $(this).unbind("mousemove"); //当鼠标抬起 删除移动事件  匹配元素宽高变化停止
          });
        });
      })
    }
})(jQuery);

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Click here for the complete example codeDownload from this site.

Readers who are interested in more jQuery-related content can check out the special topics on this site: "JQuery drag effects and skills summary", "jQuery extension skills summary", "JQuery common classic special effects summary", "jQuery animation and special effects usage summary", "jquery selector usage summary" and "jQuery common plug-ins and usage Summary》

I hope this article will be helpful to everyone in jQuery programming.