Js可拖拽放大的层拖动特效实现方法

前端技术 2023/09/09 JavaScript

本文实例讲述了Js可拖拽放大的层拖动特效实现方法。分享给大家供大家参考。具体实现方法如下：

复制代码 代码如下:
<!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>Js实现层拖动效果，还可以拖拽放大</title>
<style>
*{margin:0;padding:0;}
#zhezhao{
 width:100%;
 height:100%;
 background:#f00;
 filter:alpha(opacity:0);
 opacity:0;
 z-index:9999;
 position:absolute;
 top:0;
 left:0;
 display:none;
}
#div2{
 width:200px;
 height:200px;
 position:relative;
 background:#EEEEEE;
 border:1px solid #f00;
}
#div1{
 width:15px;
 height:15px;
 background:#99CC00;
 position:absolute;
 right:0px;
 bottom:0px;
 cursor:nw-resize;
 overflow:hidden;
 font-size:12px;
 text-align:center;
 line-height:15px;
 color:#FFFFFF;
 float:right;
 z-index:3;
}
#right{
 width:15px;
 height:100%;
 background:#f00;
 float:right;
 position:absolute;
 right:0;
 top:0;
 cursor:e-resize;
 overflow:hidden;
 filter:alpha(opacity:0);
 opacity:0;
 z-index:1;
}
#bottom{
 width:100%;
 height:15px;
 background:#f00;
 position:absolute;
 left:0;
 bottom:0;
 cursor:n-resize;
 overflow:hidden;
 filter:alpha(opacity:0);
 opacity:0;
 z-index:1;
}
#div2 p{
 padding:10px;
 line-height:24px;
 font-size:13px;
 text-indent:24px;
 color:#996600;
}
#div2 h2{
 width:100%;
 height:25px;
 line-height:25px;
 font-size:14px;
 background:#CC9900;
 color:#FFFFFF;
 text-indent:15px;
 cursor:move;
 overflow:hidden;
}
</style>
<script type=\"text/javascript\">
window.onload=function()
{
 var oDiv=document.getElementById(\"div1\");
 var oDiv2=document.getElementById(\"div2\");
 var zhezhao=document.getElementById(\"zhezhao\");
 var h2=oDiv2.getElementsByTagName(\"h2\")[0];
 var right=document.getElementById(\"right\");
 var bottom=document.getElementById(\"bottom\");
 var mouseStart={};
 var divStart={};
 var rightStart={};
 var bottomStart={};
 //往右拽
 right.onmousedown=function(ev)
 {
  var oEvent=ev||event;
  mouseStart.x=oEvent.clientX;
  mouseStart.y=oEvent.clientY;
  rightStart.x=right.offsetLeft;
  if(right.setCapture)
  {
   right.onmousemove=doDrag1;
   right.onmouseup=stopDrag1;
   right.setCapture();
  }
  else
  {
   document.addEventListener(\"mousemove\",doDrag1,true);
   document.addEventListener(\"mouseup\",stopDrag1,true);
  }
 };
 function doDrag1(ev)
 {
  var oEvent=ev||event;
  var l=oEvent.clientX-mouseStart.x+rightStart.x;
  var w=l+oDiv.offsetWidth;
 
  if(w<oDiv.offsetWidth)
  {
   w=oDiv.offsetWidth;
  }
  else if(w>document.documentElement.clientWidth-oDiv2.offsetLeft)
  {
   w=document.documentElement.clientWidth-oDiv2.offsetLeft-2;
  }
  oDiv2.style.width=w+\"px\";
 };
 function stopDrag1()
 {
  if(right.releaseCapture)
  {
   right.onmousemove=null;
   right.onmouseup=null;
   right.releaseCapture();
  }
  else
  {
   document.removeEventListener(\"mousemove\",doDrag1,true);
   document.removeEventListener(\"mouseup\",stopDrag1,true);
  }
 };
 //往下拽
 bottom.onmousedown=function(ev)
 {
  var oEvent=ev||event;
  mouseStart.x=oEvent.clientX;
  mouseStart.y=oEvent.clientY;
  bottomStart.y=bottom.offsetTop;
  if(bottom.setCapture)
  {
   bottom.onmousemove=doDrag2;
   bottom.onmouseup=stopDrag2;
   bottom.setCapture();
  }
  else
  {
   document.addEventListener(\"mousemove\",doDrag2,true);
   document.addEventListener(\"mouseup\",stopDrag2,true);
  }
 };
 function doDrag2(ev)
 {
  var oEvent=ev||event;
  var t=oEvent.clientY-mouseStart.y+bottomStart.y;
  var h=t+oDiv.offsetHeight;
 
  if(h<oDiv.offsetHeight)
  {
   h=oDiv.offsetHeight;
  }
  else if(h>document.documentElement.clientHeight-oDiv2.offsetTop)
  {
   h=document.documentElement.clientHeight-oDiv2.offsetTop-2;
  }
 
  oDiv2.style.height=h+\"px\";
 };
 function stopDrag2()
 {
  if(bottom.releaseCapture)
  {
   bottom.onmousemove=null;
   bottom.onmouseup=null;
   bottom.releaseCapture();
  }
  else
  {
   document.removeEventListener(\"mousemove\",doDrag2,true);
   document.removeEventListener(\"mouseup\",stopDrag2,true);
  }
 };
 //往左右同时拽
 oDiv.onmousedown=function(ev)
 {
  var oEvent=ev||event;
  mouseStart.x=oEvent.clientX;
  mouseStart.y=oEvent.clientY;
  divStart.x=oDiv.offsetLeft;
  divStart.y=oDiv.offsetTop;
  if(oDiv.setCapture)
  {
   oDiv.onmousemove=doDrag;
   oDiv.onmouseup=stopDrag;
   oDiv.setCapture();
  }
  else
  {
   document.addEventListener(\"mousemove\",doDrag,true);
   document.addEventListener(\"mouseup\",stopDrag,true);
  }
  zhezhao.style.display=\'block\';
 };
 function doDrag(ev)
 {
  var oEvent=ev||event;
  var l=oEvent.clientX-mouseStart.x+divStart.x;
  var t=oEvent.clientY-mouseStart.y+divStart.y;
 
 
  var w=l+oDiv.offsetWidth;
  var h=t+oDiv.offsetHeight;
 
  if(w<oDiv.offsetWidth)
  {
   w=oDiv.offsetWidth;
  }
  else if(w>document.documentElement.clientWidth-oDiv2.offsetLeft)
  {
   w=document.documentElement.clientWidth-oDiv2.offsetLeft-2;
  }
  if(h<oDiv.offsetHeight)
  {
   h=oDiv.offsetHeight;
  }
  else if(h>document.documentElement.clientHeight-oDiv2.offsetTop)
  {
   h=document.documentElement.clientHeight-oDiv2.offsetTop-2;
  }
 
  oDiv2.style.width=w+\"px\";
  oDiv2.style.height=h+\"px\";
 };
 function stopDrag()
 {
  if(oDiv.releaseCapture)
  {
   oDiv.onmousemove=null;
   oDiv.onmouseup=null;
   oDiv.releaseCapture();
  }
  else
  {
   document.removeEventListener(\"mousemove\",doDrag,true);
   document.removeEventListener(\"mouseup\",stopDrag,true);
  }
  zhezhao.style.display=\'none\';
 };
 
 //h2完美拖拽
 h2.onmousedown=function(ev)
 {
  var oEvent=ev||event;
  mouseStart.x=oEvent.clientX;
  mouseStart.y=oEvent.clientY;
  divStart.x=oDiv2.offsetLeft;
  divStart.y=oDiv2.offsetTop;
 
  if(h2.setCapture)
  {
   h2.onmousemove=doDrag3;
   h2.onmouseup=stopDrag3;
   h2.setCapture();
  }
  else
  {
   document.addEventListener(\"mousemove\",doDrag3,true);
   document.addEventListener(\"mouseup\",stopDrag3,true);
  }
 
  zhezhao.style.display=\'block\';
 };
 function doDrag3(ev)
 {
  var oEvent=ev||event;
  var l=oEvent.clientX-mouseStart.x+divStart.x;
  var t=oEvent.clientY-mouseStart.y+divStart.y;
  if(l<0)
  {
   l=0;
  }
  else if(l>document.documentElement.clientWidth-oDiv2.offsetWidth)
  {
   l=document.documentElement.clientWidth-oDiv2.offsetWidth;
  }
  if(t<0)
  {
   t=0;
  }
  else if(t>document.documentElement.clientHeight-oDiv2.offsetHeight)
  {
   t=document.documentElement.clientHeight-oDiv2.offsetHeight;
  }
  oDiv2.style.left=l+\"px\";
  oDiv2.style.top=t+\"px\";
 };
 function stopDrag3()
 {
  if(h2.releaseCapture)
  {
   h2.onmousemove=null;
   h2.onmouseup=null;
   h2.releaseCapture();
  }
  else
  {
   document.removeEventListener(\"mousemove\",doDrag3,true);
   document.removeEventListener(\"mouseup\",stopDrag3,true);
  }
 
  zhezhao.style.display=\'none\';
 }
};
</script>
</head>
<body>
<div id=\"div2\">
 <div style=\"width:100%; height:100%; overflow:hidden;\">
 <h2>完美的拖拽</h2>
 <p>体验不错的JavaScript网页拖动，除了拖动，还可拖动放大，像Windows窗口一样被放大或缩小，只要按住层的右下角，就可以收放自如的放大或缩小。想使用的朋友，可将代码里的Js封装成类，从外部引入想必更合理些。\'</p>
 <div id=\"right\"></div>
 <div id=\"div1\">拖</div>
 <div id=\"bottom\"></div>
 </div>
</div>
<div id=\"zhezhao\"></div>
</body>
</html>

希望本文所述对大家的javascript程序设计有所帮助。

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