本文實例講述了JavaScript實現DIV層拖動及動態增加新層的方法。分享給大家供大家參考。具體分析如下：
無刷新添加一個新的DIV層，并可實現的該層的拖動，鼠標拖動層可移動位置，將JS部分另存為一個新文件，用到的時候從外部引入，這個拖動層代碼很流行，GG和YAHOO等大網站經?？梢钥吹竭@種效果。
<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><title>DIV層拖動，動態增加新層的JavaScript</title><style>body {margin:0px;padding:0px;font-size:12px;text-align:center;}body > div {text-align:center; margin-right:auto; margin-left:auto;} .content{width:900px;}.content .left{ float:left; width:20%; border:1px solid #0066CC; margin:3px;}.content .center{ float:left; border:1px solid #FF0000; margin:3px; width:57%}.content .right{ float:right; width:20%; border:1px solid #FF0000; margin:3px}.mo{ height:auto; border:1px solid #CCC; margin:3px; background:#FFF}.mo h1{ background:#ECF9FF; height:18px; padding:3px; cursor:move}.closediv{ cursor:default;}.minusspan{ cursor:default;}.mo .nr{ height:80px; border:1px solid #F3F3F3; margin:2px}h1{ margin:0px; padding:0px; text-align:left; font-size:12px}.dragging { FILTER: progid:DXImageTransform.Microsoft.Alpha(opacity=60); opacity: 0.6; moz-opacity: 0.6}</style><script language="javascript">var dragobj={}window.onerror=function(){return false}var domid=12function on_ini(){ String.prototype.inc=function(s){return this.indexOf(s)>-1?true:false} var agent=navigator.userAgent window.isOpr=agent.inc("Opera") window.isIE=agent.inc("IE") && !isOpr window.isMoz=agent.inc("Mozilla") && !isOpr && !isIE if(isMoz){ Event.prototype.__defineGetter__("x",function(){return this.clientX+2}) Event.prototype.__defineGetter__("y",function(){return this.clientY+2}) } basic_ini()}function basic_ini(){ window.$=function(obj){return typeof(obj)=="string"?document.getElementById(obj):obj} window.oDel=function(obj){if($(obj)!=null){$(obj).parentNode.removeChild($(obj))}}}window.oDel=function(obj){if($(obj)!=null){$(obj).parentNode.removeChild($(obj))}}window.onload=function(){ on_ini() var o=document.getElementsByTagName("h1") for(var i=0;i<o.length;i++){ o[i].onmousedown=addevent; //添加折疊和關閉按鈕 var tt = document.createElement("div"); tt.style.cssText = "float:left"; var span = document.createElement("span"); span.innerHTML = "--"+o[i].innerHTML; span.style.cssText = "cursor:default;"; span.onmousedown = minusDiv; tt.appendChild(span); var close = document.createElement("div"); close.innerHTML = "X"; close.style.cssText = "cursor:default;float:right"; close.onmousedown = closeDiv; o[i].innerHTML = ""; o[i].appendChild(tt); o[i].appendChild(close); }}//折疊或者顯示層function minusDiv(e){ e=e||event var nr = this.parentNode.parentNode.nextSibling; //取得內容層 nr.style.display = nr.style.display==""?"none":"";}//移出層function closeDiv(e){ e=e||event var mdiv = this.parentNode.parentNode; //取得目標層 oDel(mdiv);}function addevent(e){ if(dragobj.o!=null) return false e=e||event dragobj.o=this.parentNode dragobj.xy=getxy(dragobj.o) dragobj.xx=new Array((e.x-dragobj.xy[1]),(e.y-dragobj.xy[0])) //dragobj.o.className = 'dragging'; dragobj.o.style.width=dragobj.xy[2]+"px" dragobj.o.style.height=dragobj.xy[3]+"px" dragobj.o.style.left=(e.x-dragobj.xx[0])+"px" dragobj.o.style.top=(e.y-dragobj.xx[1])+"px" dragobj.o.style.position="absolute" dragobj.o.style.filter='alpha(opacity=60)'; //添加拖動透明效果 var om=document.createElement("div") dragobj.otemp=om om.style.width=dragobj.xy[2]+"px" om.style.height=dragobj.xy[3]+"px" om.style.border = "1px dashed red"; //ikaiser添加，實現虛線框 dragobj.o.parentNode.insertBefore(om,dragobj.o) return false}document.onselectstart=function(){return false}window.onfocus=function(){document.onmouseup()}window.onblur=function(){document.onmouseup()}document.onmouseup=function(){ if(dragobj.o!=null){ dragobj.o.style.width="auto" dragobj.o.style.height="auto" dragobj.otemp.parentNode.insertBefore(dragobj.o,dragobj.otemp) dragobj.o.style.position="" oDel(dragobj.otemp) dragobj={} }}document.onmousemove=function(e){ e=e||event if(dragobj.o!=null){ dragobj.o.style.left=(e.x-dragobj.xx[0])+"px" dragobj.o.style.top=(e.y-dragobj.xx[1])+"px" createtmpl(e, dragobj.o) //傳遞當前拖動對象 }}function getxy(e){ var a=new Array() var t=e.offsetTop; var l=e.offsetLeft; var w=e.offsetWidth; var h=e.offsetHeight; while(e=e.offsetParent){ t+=e.offsetTop; l+=e.offsetLeft; } a[0]=t;a[1]=l;a[2]=w;a[3]=h return a;}function inner(o,e){ var a=getxy(o) if(e.x>a[1] && e.x<(a[1]+a[2]) && e.y>a[0] && e.y<(a[0]+a[3])){ if(e.y<(a[0]+a[3]/2)) return 1; else return 2; }else return 0;}//將當前拖動層在拖動時可變化大小，預覽效果function createtmpl(e, elm){ for(var i=0;i<domid;i++){ if(document.getElementById("m"+i) == null) //已經移出的層不再遍歷 continue; if($("m"+i)==dragobj.o) continue var b=inner($("m"+i),e) if(b==0) continue dragobj.otemp.style.width=$("m"+i).offsetWidth elm.style.width = $("m"+i).offsetWidth; //1為下移，2為上移 if(b==1){ $("m"+i).parentNode.insertBefore(dragobj.otemp,$("m"+i)) }else{ if($("m"+i).nextSibling==null){ $("m"+i).parentNode.appendChild(dragobj.otemp) }else{ $("m"+i).parentNode.insertBefore(dragobj.otemp,$("m"+i).nextSibling) } } return } for(var j=0;j<3;j++){ if($("dom"+j).innerHTML.inc("div")||$("dom"+j).innerHTML.inc("DIV")) continue var op=getxy($("dom"+j)) if(e.x>(op[1]+10) && e.x<(op[1]+op[2]-10)){ $("dom"+j).appendChild(dragobj.otemp) dragobj.otemp.style.width=(op[2]-10)+"px" } }}function add_div(){ var o=document.createElement("div") o.className="mo" o.id="m"+domid $('dom0').appendChild(o) o.innerHTML="<h1>dom"+domid+"</h1><div class=nr></div>" o.getElementsByTagName("h1")[0].onmousedown=addevent domid++}</script></head><body><INPUT TYPE="button" value="添加一個新的DIV層" onclick="add_div();"><div class=content> <div class=left id=dom0> <div class=mo id=m0> <h1>dom0</h1> <div class="nr"></div> </div> <div class=mo id=m1> <h1>dom1</h1><div class="nr"></div> </div> <div class=mo id=m2><h1>dom2</h1><div class="nr"></div></div> <div class=mo id=m3><h1>dom3</h1><div class="nr"></div></div> </div> <div class=center id=dom1> <div class=mo id=m4><h1>dom4</h1><div class="nr"></div></div> <div class=mo id=m5><h1>dom5</h1><div class="nr"></div></div> </div> <div class=right id=dom2> <div class=mo id=m8><h1>dom8</h1><div class="nr"></div></div> <div class=mo id=m9><h1>dom9</h1><div class="nr"></div></div> </div></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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