js 实现的可折叠留言板(附源码下载)

javaScript 代码如下：

$(document).ready(function(){ 

$(".message_list .message_body:gt(0)").hide(); 

$(".message_list li:gt(4)").hide();
$(".message_head").click(function(){
$(this).next(".message_body").slideToggle(500)
return false;
}); 

//收起所有消息
$(".collpase_all_message").click(function(){
$(".message_body").slideUp(500)
return false;
}); 

//显示所有消息
$(".show_all_message").click(function(){
$(this).hide()
$(".show_recent_only").show()
$(".message_list li:gt(4)").slideDown()
return false;
}); 

//只显示最近的消息
$(".show_recent_only").click(function(){
$(this).hide()
$(".show_all_message").show()
$(".message_list li:gt(4)").slideUp()
return false;
}); 

});

css部分代码如下：

* {
margin: 0;
padding: 0;
}
body {
margin: 10px auto;
width: 570px;
font: 75%/120% Arial, Helvetica, sans-serif;
}
p {
padding: 0 0 1em;
}
.message_list {
list-style: none;
margin: 0;
padding: 0;
width: 383px;
}
.message_list li {
padding: 0;
margin: 0;
background: url(images/message-bar.gif) no-repeat;
}
.message_head {
padding: 5px 10px;
cursor: pointer;
position: relative;
}
.message_head .timestamp {
color: #666666;
font-size: 95%;
position: absolute;
right: 10px;
top: 5px;
}
.message_head cite {
font-size: 100%;
font-weight: bold;
font-style: normal;
}
.message_body {
padding: 5px 10px 15px;
}
.collapse_buttons {
text-align: right;
border-top: solid 1px #e4e4e4;
padding: 5px 0;
width: 383px;
}
.collapse_buttons a {
margin-left: 15px;
float: right;
}
.show_all_message {
background: url(images/tall-down-arrow.gif) no-repeat right center;
padding-right: 12px;
}
.show_recent_only {
display: none;
background: url(images/tall-up-arrow.gif) no-repeat right center;
padding-right: 12px;
}
.collpase_all_message {
background: url(images/collapse-all.gif) no-repeat right center;
padding-right: 12px;
color: #666666;
}

HTML中添加代码如下：

<ol class="message_list">
<li>
<p class="message_head"><cite>张三:</cite> <span class="timestamp">1分钟前</span></p>
<div class="message_body">
<p>你好<br />
<br />
这是最后一条消息</p>
</div>
</li>
<li>
<p class="message_head"><cite>李四:</cite> <span class="timestamp">2分钟前</span></p>
<div class="message_body">
<p>你也好</p>
</div>
</li>
<li>
<p class="message_head"><cite>王五:</cite> <span class="timestamp">1天前</span></p>
<div class="message_body">
<p>第一次来</p>
</div>
</li>
<li>
<p class="message_head"><cite>李四:</cite> <span class="timestamp">2天前</span></p>
<div class="message_body">
<p>顶</p>
</div>
</li>
<li>
<p class="message_head"><cite>王五:</cite> <span class="timestamp">3天前</span></p>
<div class="message_body">
<p>支持</p>
</div>
</li>
<li>
<p class="message_head"><cite>李四:</cite> <span class="timestamp">5天前</span></p>
<div class="message_body">
<p>大家好</p>
</div>
</li>
<li>
<p class="message_head"><cite>张三:</cite> <span class="timestamp">6 天前</span></p>
<div class="message_body">
<p>大家好</p>
</div>
</li>
<li>
<p class="message_head"><cite>李四:</cite> <span class="timestamp">7天前</span></p>
<div class="message_body">
<p>这里不错哦</p>
</div>
</li>
<li>
<p class="message_head"><cite>王五:</cite> <span class="timestamp">8 天前</span></p>
<div class="message_body">
<p>好地方</p>
</div>
</li>
</ol>
<p class="collapse_buttons"><a href="#" class="show_all_message">显示所有消息(9)</a> <a href="#" class="show_recent_only">只显示五条消息</a> <a href="#" class="collpase_all_message">收起所有消息</a></p>
<br />

案例下载