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JS implements mouse drag effect of expandable folding layer_javascript skills

PHP中文网Original: 2016-05-16 15:37:121229browse

The example in this article describes the mouse dragging effect of expandable folding layer using JS. Share it with everyone for your reference. The details are as follows:

This is a mouse dragging layer effect implemented by simple JS code. It is relatively streamlined. Please refer to it. Click the layer title bar with the mouse to expand and collapse the layer content, and press and hold the title bar to drag the layer.

A screenshot of the running effect is as follows:

The online demo address is as follows:

http://demo.jb51.net/ js/2015/js-fade-out-mouse-draw-style-demo/

The specific code is as follows:

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
 <head>
 <title>鼠标拖曳</title>
 </head>
 <body>
 <script type="text/javascript">
 function drag(elementToDrag,event){
  var startX=event.clientX,startY=event.clientY;
  var origX=elementToDrag.offsetLeft,origY=elementToDrag.offsetTop;
  var deltaX=startX-origX,deltaY=startY-origY;
  if(document.addEventListener){
    document.addEventListener("mousemove",moveHandler,true); 
  document.addEventListener("mouseup",upHandler,true);
 }
 else{
  elementToDrag.setCapture();
  elementToDrag.attachEvent("onmousemove",moveHandler);
  elementToDrag.attachEvent("onmouseup",upHandler);
  elementToDrag.attachEvent("onlosecapture",upHandler);
 }
 if(event.stopPropagation) event.stopPropagation();
 else event.cancelBubble=true;
 if(event.preventDefault) event.preventDefault();
 else event.returnValue=false;
 function moveHandler(e){
  if(!e) e=window.event;
  elementToDrag.style.left=(e.clientX-deltaX)+"px";
  elementToDrag.style.top=(e.clientY-deltaY)+"px";
  elementToDrag.style.zIndex="10";
  elementToDrag.getElementsByTagName("p")[0].innerHTML="clientX:"+e.clientX+"
  </br>"+"clientY:"+e.clientY+"</br>"+"offsetLeft:"+origX+"</br>
  "+"offsetTop:"+origY+"</br>"+"clientX-offsetLeft:"+deltaX+"</br>"+"clientY-offsetTop:"+deltaY+"</br>";
  if(e.stopPropagation) e.stopPropagation();
  else e.cancelBubble = true;
 }
 function upHandler(e){
  if(!e) e=window.event;
   elementToDrag.style.zIndex="1";
  if(document.removeEventListener){
   document.removeEventListener("mouseup",upHandler,true);
  document.removeEventListener("mousemove",moveHandler,true);
  }
  else{
   elementToDrag.detachEvent("onlosecapture",upHandler);
  elementToDrag.detachEvent("onmouseup",upHandler);
  elementToDrag.detachEvent("onmousemove",moveHandler);
  elementToDrag.releaseCapture();
  }
  if(e.stopPropagation) e.stopPropagation();
  else e.cancelBubble=true;
 }
 }
 </script>
 <div style="position:absolute;left:100px;top:100px;width:250px;background-color:#789;border:1px solid #f00">
  <div style="background:#ccc;border-bottom:dotted black;padding:3px;font-weight:bold" 
  onmousedown="drag(this.parentNode,event)">Drag Me1</div>
 <p>test</p>
 </div>
 <div style="position:absolute;left:100px;top:200px;width:250px;background-color:#789;border:1px solid #f00">
  <div style="background:#ccc;border-bottom:dotted black;padding:3px;font-weight:bold" 
  onmousedown="drag(this.parentNode,event)">Drag Me2</div>
 <p>test</p>
 </div>
 <div style="position:absolute;left:100px;top:300px;width:250px;background-color:#789;border:1px solid #f00">
  <div style="background:#ccc;border-bottom:dotted black;padding:3px;font-weight:bold"
   onmousedown="drag(this.parentNode,event)">Drag Me3</div>
 <p>test</p>
 </div>
 </body>
</html>

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