JavaScript实现DIV层拖动及动态增加新层的方法

2019-11-20 12:30:00

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本文实例讲述了JavaScript实现DIV层拖动及动态增加新层的方法。分享给大家供大家参考。具体分析如下：

无刷新添加一个新的DIV层，并可实现的该层的拖动，鼠标拖动层可移动位置，将JS部分另存为一个新文件，用到的时候从外部引入，这个拖动层代码很流行，GG和YAHOO等大网站经常可以看到这种效果。

<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><title>DIV层拖动，动态增加新层的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;    //添加折叠和关闭按钮    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);  }}//折叠或者显示层function minusDiv(e){  e=e||event  var nr = this.parentNode.parentNode.nextSibling; //取得内容层  nr.style.display = nr.style.display==""?"none":"";}//移出层function closeDiv(e){  e=e||event  var mdiv = this.parentNode.parentNode; //取得目标层  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)'; //添加拖动透明效果  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，实现虚线框  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) //传递当前拖动对象  }}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;}//将当前拖动层在拖动时可变化大小，预览效果function createtmpl(e, elm){  for(var i=0;i<domid;i++){    if(document.getElementById("m"+i) == null) //已经移出的层不再遍历      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为下移，2为上移    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="添加一个新的DIV层" 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>

希望本文所述对大家的javascript程序设计有所帮助。

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