HTML结构如下：
<body>
<ul class="rolinList" id="rolin">
<li>
<h2>下拉标题 1</h2>
<div class="content">
<p>下拉展开后显示内容<br />
<br />
<a href="###" target="_blank">下拉显示内容</a></p>
</div>
</li>
<li>
<h2>下拉标题 2</h2>
<div class="content">
<p>下拉展开后显示内容<br />
<br />
<a href="###" target="_blank">下拉显示内容</a></p>
</div>
</li>
<li>
<h2>下拉标题 3</h2>
<div class="content">
<p>下拉展开后显示内容<br />
<br />
<a href="###" target="_blank">下拉显示内容</a></p>
</div>
</li>
<li>
<h2>下拉标题 4</h2>
<div class="content">
<p>下拉展开后显示内容<br />
<br />
<a href="###" target="_blank">下拉显示内容</a></p>
</div>
</li>
<li>
<h2>下拉标题 5</h2>
<div class="content">
<p>下拉展开后显示内容<br />
<br />
<a href="###" target="_blank">下拉显示内容</a></p>
</div>
</li>
<li>
<h2>下拉标题 6</h2>
<div class="content">
<p>下拉展开后显示内容<br />
<br />
<a href="###" target="_blank">下拉显示内容</a></p>
</div>
</li>
</ul>
</body>
JS代码如下：
// JavaScript Document
//<![CDATA[
window.onload = function()
{
rolinTab("rolin")
}
function rolinTab(obj)
{
var list = $(obj).getElementsByTagName("LI");
var state = {
show: false,
hidden: false,
showObj: false
};
for (var i = 0; i < list.length; i++)
{
var tmp = new rolinItem(list[i], state);
if (i == 0)
tmp.pShow();
}
}
// 构造函数
function rolinItem(obj, state)
{
//alert(obj.parentNode.children.length) // test
var speed = 0.0666;
var range = 1;
var interval;
var tarH;
var head = getFirstChild(obj);
var content = getNextChild(head);
var isOpen = false;
var tar = this;
this.pHidden = function()
{
if (isOpen)
hidden();
}
this.pShow = show;
var baseH = content.offsetHeight;
content.style.display = "none"; // 初始化，所有的 li 下的content 都隐藏
var isOpen = false;
head.onmouseover = function()
{
this.style.background = "#EFEFEF";
}
head.onmouseout = mouseout;
head.onclick = function()
{
this.style.background = "#EFEFEF";
if (!state.show && !state.hidden)
{
if (!isOpen)
{
head.onmouseout = null;
show();
}
else {
hidden();
}
}
}
function mouseout()
{
this.style.background = "#FFF"
}
function show()
{
head.style.borderBottom = "1px solid #DADADA";
if (state.openObj && state.openObj != tar) // 备注：未被点击的 li 为 的隐藏掉
{
state.openObj.pHidden();
}
content.style.height = "0px";
content.style.display = "block";
content.style.overflow = "hidden";
state.openObj = tar;
state.show = true;
tarH = baseH;
interval = setInterval(move, 10);
}
function showS()
{
isOpen = true;
state.show = false;
}
function hidden()
{
state.hidden = true;
tarH = 0;
interval = setInterval(move, 10);
}
function hiddenS()
{
head.style.borderBottom = "none";
/* 备注：以下两句貌似可以省略
head.onmouseout = mouseout;
head.onmouseout();
*/
content.style.display = "none";
isOpen = false;
state.hidden = false;
}
function move()
{
var dist = (tarH - content.style.height.pxToNum()) * speed;
if (Math.abs(dist) < 1)
dist = dist > 0 ? 1 : -1;
content.style.height = (content.style.height.pxToNum() + dist) + "px";
if (Math.abs(content.style.height.pxToNum() - tarH) <= range)
{
clearInterval(interval);
content.style.height = tarH + "px";
if (tarH != 0)
{
showS()
}
else {
hiddenS();
}
}
}
}
// Tools
var $ = function($)
{
return document.getElementById($)
};
String.prototype.pxToNum = function()
{
return Number(this.replace("px", ""))
}
function getFirstChild(obj)
{
var result = obj.firstChild;
while (!result.tagName)
{
result = result.nextSibling;
}
return result;
}
function getNextChild(obj)
{
var result = obj.nextSibling;
while (!result.tagName)
{
result = result.nextSibling;
}
return result;
}
//]]>
