JavaScript实现DIV层拖动及动态增加新层的方法

2024-05-06 16:20:02

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这篇文章主要介绍了JavaScript实现DIV层拖动及动态增加新层的方法,设计javascript操作div层的拖动与增加的相关技巧,需要的朋友可以参考下

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=12

function 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>