JS實現可展開折疊層的鼠標拖曳效果
編輯：關於JavaScript
本文實例講述了JS實現可展開折疊層的鼠標拖曳效果。分享給大家供大家參考。具體如下：
這是一款簡單JS代碼實現的鼠標拖曳圖層效果，比較精簡，大家參考一下。鼠標點擊層標題欄可實現層內容的展開與折疊，按住標題欄可實現層的拖動。
運行效果截圖如下：
在線演示地址如下：
http://demo.jb51.net/js/2015/js-fade-out-mouse-draw-style-demo/
具體代碼如下：
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<title>鼠標拖曳</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>
希望本文所述對大家的JavaScript程序設計有所幫助。
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