JavaScript简单下拉菜单实例代码

本文实例讲述了JavaScript简单下拉菜单实例代码。分享给大家供大家参考。具体如下:

这是一款JavaScript实现的下拉菜单演示代码,带渐变效果的CSS+jQuery菜单,向下滑出型的菜单,最高支持两级,网上常见到的一种菜单风格,希望大家喜欢哦。

运行效果截图如下:

在线演示地址如下:

http://demo.jb51.net/js/2015/js-simple-xlcd-down-menu-codes/

具体代码如下:

<!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=UTF-8">

<title>JavaScript下拉菜单演示代码</title>

<style type="text/css">

body {margin:25px; font:12px Verdana, Arial, Helvetica}

* {padding:0; margin:0}

.dropdown {float:left; padding-right:0px}

.dropdown dt {width:80px; border:2px solid #9ac1c9; padding:8px; font-weight:bold; cursor:pointer; background:url()}

.dropdown dt:hover {background:url()}

.dropdown dd {position:absolute; overflow:hidden; width:100px; display:none; background:#fff; z-index:200; opacity:0}

.dropdown ul {width:100px; border:2px solid #9ac1c9; list-style:none; border-top:none}

.dropdown li {display:inline}

.dropdown a, .dropdown a:active, .dropdown a:visited {display:block; padding:5px; color:#333; text-decoration:none; background:#eaf0f2; width:194px}

.dropdown a:hover {background:#d9e1e4; color:#000}

.dropdown .underline {border-bottom:1px solid #b9d6dc}

</style>

<script language="javascript">

var DDSPEED = 10;

var DDTIMER = 15;

function ddMenu(id,d){

var h = document.getElementById(id + '-ddheader');

var c = document.getElementById(id + '-ddcontent');

clearInterval(c.timer);

if(d == 1){

clearTimeout(h.timer);

if(c.maxh && c.maxh <= c.offsetHeight){return}

else if(!c.maxh){

c.style.display = 'block';

c.style.height = 'auto';

c.maxh = c.offsetHeight;

c.style.height = '0px';

}

c.timer = setInterval(function(){ddSlide(c,1)},DDTIMER);

}else{

h.timer = setTimeout(function(){ddCollapse(c)},50);

}

}

// collapse the menu //

function ddCollapse(c){

c.timer = setInterval(function(){ddSlide(c,-1)},DDTIMER);

}

function cancelHide(id){

var h = document.getElementById(id + '-ddheader');

var c = document.getElementById(id + '-ddcontent');

clearTimeout(h.timer);

clearInterval(c.timer);

if(c.offsetHeight < c.maxh){

c.timer = setInterval(function(){ddSlide(c,1)},DDTIMER);

}

}

function ddSlide(c,d){

var currh = c.offsetHeight;

var dist;

if(d == 1){

dist = (Math.round((c.maxh - currh) / DDSPEED));

}else{

dist = (Math.round(currh / DDSPEED));

}

if(dist <= 1 && d == 1){

dist = 1;

}

c.style.height = currh + (dist * d) + 'px';

c.style.opacity = currh / c.maxh;

c.style.filter = 'alpha(opacity=' + (currh * 100 / c.maxh) + ')';

if((currh < 2 && d != 1) || (currh > (c.maxh - 2) && d == 1)){

clearInterval(c.timer);

}

}

</script>

</head>

<body>

<br><br>

<dl class="dropdown">

<dt id="one-ddheader" onmouseover="ddMenu('one',1)" onmouseout="ddMenu('one',-1)">One</dt>

<dd id="one-ddcontent" onmouseover="cancelHide('one')" onmouseout="ddMenu('one',-1)">

<ul>

<li><a href="#" class="underline"></a></li>

<li><a href="#" class="underline">Navigation Item 2</a></li>

<li><a href="#" class="underline">Navigation Item 3</a></li>

<li><a href="#" class="underline">Navigation Item 4</a></li>

<li><a href="#">Navigation Item 5</a></li>

</ul>

</dd>

</dl>

<dl class="dropdown">

<dt id="two-ddheader" onmouseover="ddMenu('two',1)" onmouseout="ddMenu('two',-1)">Two</dt>

<dd id="two-ddcontent" onmouseover="cancelHide('two')" onmouseout="ddMenu('two',-1)">

<ul>

<li><a href="#" class="underline">Navigation Item 1</a></li>

<li><a href="#" class="underline">Navigation Item 2</a></li>

<li><a href="#" class="underline">Navigation Item 3</a></li>

<li><a href="#" class="underline">默认主页</a></li>

<li><a href="#">Navigation Item 5</a></li>

</ul>

</dd>

</dl>

<dl class="dropdown">

<dt id="three-ddheader" onmouseover="ddMenu('three',1)" onmouseout="ddMenu('three',-1)">Two</dt>

<dd id="three-ddcontent" onmouseover="cancelHide('three')" onmouseout="ddMenu('three',-1)">

<ul>

<li><a href="#" class="underline">Navigation Item 1</a></li>

<li><a href="#" class="underline">Navigation Item 2</a></li>

<li><a href="#" class="underline">Navigation Item 3</a></li>

<li><a href="#" class="underline">Navigation Item 4</a></li>

<li><a href="#">Navigation Item 5</a></li>

</ul>

</dd>

</dl>

<dl class="dropdown">

<dt id="four-ddheader" onmouseover="ddMenu('four',1)" onmouseout="ddMenu('four',-1)">Two</dt>

<dd id="four-ddcontent" onmouseover="cancelHide('four')" onmouseout="ddMenu('four',-1)">

<ul>

<li><a href="#" class="underline">默认主页</a></li>

<li><a href="#" class="underline">Navigation Item 2</a></li>

<li><a href="#" class="underline">Navigation Item 3</a></li>

<li><a href="#" class="underline">Navigation Item 4</a></li>

<li><a href="#">Navigation Item 5</a></li>

</ul>

</dd>

</dl>

<dl class="dropdown">

<dt id="fir-ddheader" onmouseover="ddMenu('fir',1)" onmouseout="ddMenu('fir',-1)">Two</dt>

<dd id="fir-ddcontent" onmouseover="cancelHide('fir')" onmouseout="ddMenu('fir',-1)">

<ul>

<li><a href="#" class="underline">Navigation Item 1</a></li>

<li><a href="#" class="underline">默认主页</a></li>

<li><a href="#" class="underline">Navigation Item 3</a></li>

<li><a href="#" class="underline">Navigation Item 4</a></li>

<li><a href="#">Navigation Item 5</a></li>

</ul>

</dd>

</dl>

<dl class="dropdown">

<dt id="six-ddheader" onmouseover="ddMenu('six',1)" onmouseout="ddMenu('six',-1)">Two</dt>

<dd id="six-ddcontent" onmouseover="cancelHide('six')" onmouseout="ddMenu('six',-1)">

<ul>

<li><a href="#" class="underline">Navigation Item 1</a></li>

<li><a href="#" class="underline">Navigation Item 2</a></li>

<li><a href="#" class="underline">Navigation Item 3</a></li>

<li><a href="#" class="underline">Navigation Item 4</a></li>

<li><a href="#">Navigation Item 5</a></li>

</ul>

</dd>

</dl>

<dl class="dropdown">

<dt id="seven-ddheader" onmouseover="ddMenu('seven',1)" onmouseout="ddMenu('seven',-1)">Two</dt>

<dd id="seven-ddcontent" onmouseover="cancelHide('seven')" onmouseout="ddMenu('seven',-1)">

<ul>

<li><a href="#" class="underline">Navigat</a></li>

<li><a href="#" class="underline">Naviga</a></li>

<li><a href="#" class="underline">Navigati</a></li>

<li><a href="#" class="underline">Navigat</a></li>

<li><a href="#">Navigatio</a></li>

</ul>

</dd>

</dl>

<div style="clear:both">

</div>

</body>

</html>

希望本文所述对大家的JavaScript程序设计有所帮助。

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