当前位置: 首页 > 图文教程 > 网络编程 > Javascript > 拖动层效果,兼容IE和FF!

Javascript
jquery ajax提交表单数据的两种方式
js数字输入框(包括最大值最小值限制和四舍五入)
文本框的字数限制功能jquery插件
JavaScript让IE浏览器event对象符合W3C DOM标准
为jquery.ui.dialog 增加“在当前鼠标位置打开”的功能
为jquery.ui.dialog 增加“自动记住关闭时的位置”的功能
js版扫雷实现代码 原理不错
鼠标跟随的文字变动效果
JS 判断undefined的实现代码
Ext grid 添加右击菜单
javascript或asp实现的判断身份证号码是否正确两种验证方法
javascript 获取元素位置的快速方法 getBoundingClientRect()
javascript 面向对象继承
JavaScript 地震特效
jquery.ui.progressbar 中文文档
JS 拖动效果实现代码 比较简单
JS小框架 fly javascript framework
JS在IE和FF下attachEvent,addEventListener学习笔记
js 对联广告、漂浮广告封装类(IE,FF,Opera,Safari,Chrome
js 动态选中下拉框

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: 180 ::
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。