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Javascript 中的 拖动层效果，兼容IE和FF!

出处:互联网   整理: 软晨网（RuanChen.com）   发布: 2009-09-12   浏览: 150 ::
收藏到网摘: n/a

复制代码 代码如下:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="content-type" content="text/html; charset=gb2312">
<meta http-equiv="content-script-type" content="text/javascript">
<meta http-equiv="content-style-type" content="text/css">
<title>DoDi Chat v1.0 Beta</title>
<style rel="stylesheet" type="text/css" media="all" />
<!--
body {
text-align:left;
margin:0;
font:normal 12px Verdana, Arial;
background:#FFEEFF
}
form {
margin:0;
font:normal 12px Verdana, Arial;
}
table,input {
font:normal 12px Verdana, Arial;
}
a:link,a:visited{
text-decoration:none;
color:#333333;
}
a:hover{
text-decoration:none;
color:#FF6600
}
#main {
width:400px;
position:absolute;
left:600px;
top:100px;
background:#EFEFFF;
text-align:left;
filter:Alpha(opacity=90)
}
#ChatHead {
text-align:right;
padding:3px;
border:1px solid #003399;
background:#DCDCFF;
font-size:11px;
color:#3366FF;
cursor:move;
}
#ChatHead a:link,#ChatHead a:visited, {
font-size:14px;
font-weight:bold;
padding:0 3px
}
#ChatBody {
border:1px solid #003399;
border-top:none;
padding:2px;
}
#ChatContent {
height:200px;
padding:6px;
overflow-y:scroll;
word-break: break-all
}
#ChatBtn {
border-top:1px solid #003399;
padding:2px
}
-->
</style>
<script language="javascript" type="text/javascript">
<!--
function ChatHidden()
{
document.getElementById("ChatBody").style.display = "none";
}
function ChatShow()
{
document.getElementById("ChatBody").style.display = "";
}
function ChatClose()
{
document.getElementById("main").style.display = "none";
}
function ChatSend(obj)
{
var o = obj.ChatValue;
if (o.value.length>0){
document.getElementById("ChatContent").innerHTML += "<strong>Akon说：</strong>"+o.value+"<br/>";
o.value='';
}
}
if (document.getElementById)
{
(
function()
{
if (window.opera){ document.write("<input type='hidden' id='Q' value=' '>"); }
var n = 500;
var dragok = false;
var y,x,d,dy,dx;
function move(e)
{
if (!e) e = window.event;
if (dragok){
d.style.left = dx + e.clientX - x + "px";
d.style.top = dy + e.clientY - y + "px";
return false;
}
}
function down(e)
{
if (!e) e = window.event;
var temp = (typeof e.target != "undefined")?e.target:e.srcElement;
if (temp.tagName != "HTML"|"BODY" && temp.className != "dragclass"){
temp = (typeof temp.parentNode != "undefined")?temp.parentNode:temp.parentElement;
}
if('TR'==temp.tagName){
temp = (typeof temp.parentNode != "undefined")?temp.parentNode:temp.parentElement;
temp = (typeof temp.parentNode != "undefined")?temp.parentNode:temp.parentElement;
temp = (typeof temp.parentNode != "undefined")?temp.parentNode:temp.parentElement;
}
if (temp.className == "dragclass"){
if (window.opera){ document.getElementById("Q").focus(); }
dragok = true;
temp.style.zIndex = n++;
d = temp;
dx = parseInt(temp.style.left+0);
dy = parseInt(temp.style.top+0);
x = e.clientX;
y = e.clientY;
document.onmousemove = move;
return false;
}
}
function up(){
dragok = false;
document.onmousemove = null;
}
document.onmousedown = down;
document.onmouseup = up;
}
)();
}
-->
</script>
</head>
<body>
<div id="main" class="dragclass">
<div id="ChatHead">
<a href="#" onclick="ChatHidden();">-</a>
<a href="#" onclick="ChatShow();">+</a>
<a href="#" onclick="ChatClose();">x</a>
</div>
<div id="ChatBody">
<div id="ChatContent"></div>
<div id="ChatBtn">
<form action="" name="chat" method="post">
<textarea name="ChatValue" rows="3" style="width:350px"></textarea>
<input name="Submit" type="button" value="Chat" onclick="ChatSend(this.form);" />
</form>
</div>
</div>
</div>
</body>
</html>

一个拖动效果，根据论坛的一些帖子改的，但还有一些BUG一直没法解决，谁能帮我改改？
当第一次拖动层时，层的位置会偏离很远。
呃。。。这涉及到一个style的问题。。。
在ie和firefox中，obj.style这个东西实际上只是取得元素中属性style中的值！
如下例，你会发现style块中的属性一个都取不到！
复制代码 代码如下:

<style>
#test{width:100px;background-color:red;}
</style>
<script>
window.onload=function(){
var t=document.getElementById('test')
var ts=t.style;
t.innerHTML=
"t.style.width:"+ts.width+"<br />"+
"t.style.backgroundColor:"+ts.backgroundColor+"<br />"+
"t.style.color:"+ts.color+"<br />"+
"t.style.paddingLeft:"+ts.paddingLeft
}
</script>
<body>
<div id="test" style="color:yellow;padding-left:100px;">
</div>
</body>

看到了没？前两个style 为空，后两个才有值。
如果是ie，问题很好解决，只要把style改成currentStyle即可。
IE Only
复制代码 代码如下:

<style>
#test{width:100px;background-color:red;}
</style>
<script>
window.onload=function(){
var t=document.getElementById('test')
var ts=t.currentStyle;
t.innerHTML=
"t.style.width:"+ts.width+"<br />"+
"t.style.backgroundColor:"+ts.backgroundColor+"<br />"+
"t.style.color:"+ts.color+"<br />"+
"t.style.paddingLeft:"+ts.paddingLeft
}
</script>
<body>
<div id="test" style="color:yellow;padding-left:100px;">
</div>
</body>

FF only
复制代码 代码如下:

<style>
#test{width:100px;background-color:red;}
</style>
<script>
window.onload=function(){
var t=document.getElementById('test')
var ts=document.defaultView.getComputedStyle(t, null);
t.innerHTML=
"t.style.width:"+ts.width+"<br />"+
"t.style.backgroundColor:"+ts.backgroundColor+"<br />"+
"t.style.color:"+ts.color+"<br />"+
"t.style.paddingLeft:"+ts.paddingLeft
}
</script>
<body>
<div id="test" style="color:yellow;padding-left:100px;">
</div>
</body>

我绕了半天，你明白你的错误原因了吗？你的style全都是文档级style，而你试图获取left的时候，第一次获得的只是0,自然会把你的框给挪到边上去了。

最终效果
复制代码 代码如下:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="content-type" content="text/html; charset=gb2312">
<meta http-equiv="content-script-type" content="text/javascript">
<meta http-equiv="content-style-type" content="text/css">
<title>DoDi Chat v1.0 Beta</title>
<style rel="stylesheet" type="text/css" media="all" />
<!--
body {
text-align:left;
margin:0;
font:normal 12px Verdana, Arial;
background:#FFEEFF
}
form {
margin:0;
font:normal 12px Verdana, Arial;
}
table,input {
font:normal 12px Verdana, Arial;
}
a:link,a:visited{
text-decoration:none;
color:#333333;
}
a:hover{
text-decoration:none;
color:#FF6600
}
#main {
width:400px;
position:absolute;
left:600px;
top:100px;
background:#EFEFFF;
text-align:left;
filter:Alpha(opacity=90)
}
#ChatHead {
text-align:right;
padding:3px;
border:1px solid #003399;
background:#DCDCFF;
font-size:11px;
color:#3366FF;
cursor:move;
}
#ChatHead a:link,#ChatHead a:visited, {
font-size:14px;
font-weight:bold;
padding:0 3px
}
#ChatBody {
border:1px solid #003399;
border-top:none;
padding:2px;
}
#ChatContent {
height:200px;
padding:6px;
overflow-y:scroll;
word-break: break-all
}
#ChatBtn {
border-top:1px solid #003399;
padding:2px
}
-->
</style>
<script language="javascript" type="text/javascript">
<!--
function $(d){return document.getElementById(d);}
function gs(d){var t=$(d);if (t){return t.style;}else{return null;}}
function gs2(d,a){
if (d.currentStyle){
var curVal=d.currentStyle[a]
}else{
var curVal=document.defaultView.getComputedStyle(d, null)[a]
}
return curVal;
}
function ChatHidden(){gs("ChatBody").display = "none";}
function ChatShow(){gs("ChatBody").display = "";}
function ChatClose(){gs("main").display = "none";}
function ChatSend(obj){
var o = obj.ChatValue;
if (o.value.length>0){
$("ChatContent").innerHTML += "<strong>Akon说：</strong>"+o.value+"<br/>";
o.value='';
}
}
if (document.getElementById){
(
function(){
if (window.opera){ document.write("<input type='hidden' id='Q' value=' '>"); }
var n = 500;
var dragok = false;
var y,x,d,dy,dx;
function move(e)
{
if (!e) e = window.event;
if (dragok){
d.style.left = dx + e.clientX - x + "px";
d.style.top = dy + e.clientY - y + "px";
return false;
}
}
function down(e){
if (!e) e = window.event;
var temp = (typeof e.target != "undefined")?e.target:e.srcElement;
if (temp.tagName != "HTML"|"BODY" && temp.className != "dragclass"){
temp = (typeof temp.parentNode != "undefined")?temp.parentNode:temp.parentElement;
}
if('TR'==temp.tagName){
temp = (typeof temp.parentNode != "undefined")?temp.parentNode:temp.parentElement;
temp = (typeof temp.parentNode != "undefined")?temp.parentNode:temp.parentElement;
temp = (typeof temp.parentNode != "undefined")?temp.parentNode:temp.parentElement;
}
if (temp.className == "dragclass"){
if (window.opera){ document.getElementById("Q").focus(); }
dragok = true;
temp.style.zIndex = n++;
d = temp;
dx = parseInt(gs2(temp,"left"))|0;
dy = parseInt(gs2(temp,"top"))|0;
x = e.clientX;
y = e.clientY;
document.onmousemove = move;
return false;
}
}
function up(){
dragok = false;
document.onmousemove = null;
}
document.onmousedown = down;
document.onmouseup = up;
}
)();
}
-->
</script>
</head>
<body>
<div id="main" class="dragclass" style="left:600px;top:300px;">
<div id="ChatHead">
<a href="#" onclick="ChatHidden();">-</a>
<a href="#" onclick="ChatShow();">+</a>
<a href="#" onclick="ChatClose();">x</a>
</div>
<div id="ChatBody">
<div id="ChatContent"></div>
<div id="ChatBtn">
<form action="" name="chat" method="post">
<textarea name="ChatValue" rows="3" style="width:350px"></textarea>
<input name="Submit" type="button" value="Chat" onclick="ChatSend(this.form);" />
</form>
</div>
</div>
</div>
</body>
</html>

附解决问题的过程：
1、首先debug，看表现，就知道是在第一次点击的时候，对象的左右边距出错，变成0
2、找到代码中对应位置，输出left和top
3、知道原因，我之前已经知道currentStyle的效果，所以我不需要去网络上搜索相关资料
4、但是我不知道在firefox下如何处理
5、我在google里直接搜索“currentStyle firefox”，很快就找到符合我目的的信息
6、测试通过，发帖子。