可折叠展开的导航菜单特效代码

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以下是可折叠展开的导航菜单特效代码的示例演示效果:

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部分效果截图:

HTML代码(index.html):

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
  <head>
	<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<meta name="keywords" content="JS代码,菜单导航,JS广告代码,JS特效代码" />
<meta name="description" content="此代码内容为可折叠展开的导航菜单，属于站长常用代码" />
<title>可折叠展开的导航菜单</title>
	<link rel="stylesheet" type="text/css" href="sdmenu/sdmenu.css" />
	<script type="text/javascript" src="sdmenu/sdmenu.js">
		/***********************************************
		* Slashdot Menu script- By DimX
		* Submitted to Dynamic Drive DHTML code library: #www.dynamicdrive.com
		* Visit Dynamic Drive at #www.dynamicdrive.com/ for full source code
		***********************************************/
	</script>
	<script type="text/javascript">
	// <![CDATA[
	var myMenu;
	window.onload = function() {
		myMenu = new SDMenu("my_menu");
		myMenu.init();
	};
	// ]]>
	</script>
  </head>
  <body>
    <form action="#" style="font-family: sans-serif; font-size: .8em" onsubmit="return false">
      <fieldset><legend>Menu actions</legend>
        <label for="speed">Speed (1-5):</label>
        <input type="text" id="speed" value="3" size="1" onchange="myMenu.speed = parseInt(this.value)" />
        &nbsp;&nbsp;&nbsp;
        <label for="oneSmOnly">One submenu at a time:</label>
        <select id="oneSmOnly" onchange="myMenu.oneSmOnly = this.selectedIndex"><option>false</option><option>true</option></select>
        &nbsp;&nbsp;&nbsp;
        <select name="smNr"><option>1</option><option>2</option><option>3</option><option>4</option></select>
        <input type="button" value="Expand" onclick="myMenu.expandMenu(myMenu.submenus[smNr.selectedIndex])" />
        <input type="button" value="Collapse" onclick="myMenu.collapseMenu(myMenu.submenus[smNr.selectedIndex])" />
        <input type="button" value="Toggle" onclick="myMenu.toggleMenu(myMenu.submenus[smNr.selectedIndex])" />
        &nbsp;&nbsp;&nbsp;
        <input type="button" value="Expand all" onclick="myMenu.expandAll()" />
        <input type="button" value="Collapse all" onclick="myMenu.collapseAll()" />
      </fieldset>
    </form>

    <div style="float: left" id="my_menu" class="sdmenu">
      <div>
        <span>Online Tools</span>
        <a href="#tools.dynamicdrive.com/imageoptimizer/">Image Optimizer</a>
        <a href="#tools.dynamicdrive.com/favicon/">FavIcon Generator</a>
        <a href="#www.dynamicdrive.com/emailriddler/">Email Riddler</a>
        <a href="#tools.dynamicdrive.com/password/">htaccess Password</a>
        <a href="#tools.dynamicdrive.com/gradient/">Gradient Image</a>
        <a href="#tools.dynamicdrive.com/button/">Button Maker</a>
      </div>
      <div>
        <span>Support Us</span>
        <a href="#www.dynamicdrive.com/recommendit/">Recommend Us</a>
        <a href="#www.dynamicdrive.com/link.htm">Link to Us</a>
        <a href="#www.dynamicdrive.com/resources/">Web Resources</a>
      </div>
      <div class="collapsed">
        <span>Partners</span>
        <a href="#www.javascriptkit.com">JavaScript Kit</a>
        <a href="#www.cssdrive.com">CSS Drive</a>
        <a href="#www.codingforums.com">CodingForums</a>
        <a href="#www.dynamicdrive.com/style/">CSS Examples</a>
      </div>
      <div>
        <span>Test Current</span>
        <a href="?foo=bar">Current or not</a>
        <a href="./">Current or not</a>
        <a href="index.html">Current or not</a>
        <a href="index.html?query">Current or not</a>
      </div>
    </div>

    <div style="padding-left: 200px">
      <pre>
var myMenu = new SDMenu("main_menu"); // ID of the menu element
// Default values...
myMenu.speed = 3;                     // Menu sliding speed (1 - 5 recomended)
myMenu.remember = true;               // Store menu states (expanded or collapsed) in cookie and restore later
myMenu.oneSmOnly = false;             // One expanded submenu at a time
myMenu.markCurrent = true;            // Mark current link / page (link.href == location.href)

myMenu.init();

// Additional methods...
var firstSubmenu = myMenu.submenus[0];
myMenu.expandMenu(firstSubmenu);      // Expand a submenu
myMenu.collapseMenu(firstSubmenu);    // Collapse a menu
myMenu.toggleMenu(firstSubmenu);      // Expand if collapsed and collapse if expanded

myMenu.expandAll();                   // Expand all submenus
myMenu.collapseAll();                 // Collapse all submenus
      </pre>
    </div>
  </body>
</html>

JS代码(sdmenu.js):

function SDMenu(id){
	if (!document.getElementById || !document.getElementsByTagName)return false;
	this.menu = document.getElementById(id);
	this.submenus = this.menu.getElementsByTagName("div");
	this.remember = true;
	this.speed = 3;
	this.markCurrent = true;
	this.oneSmOnly = false;
}
SDMenu.prototype.init = function(){
	var mainInstance = this;
	for (var i = 0;
	i < this.submenus.length;
	i++)this.submenus[i].getElementsByTagName("span")[0].onclick = function(){
	mainInstance.toggleMenu(this.parentNode);
}
;
	if (this.markCurrent){
	var links = this.menu.getElementsByTagName("a");
	for (var i = 0;
	i < links.length;
	i++)if (links[i].href == document.location.href){
	links[i].className = "current";
	break;
}
}
if (this.remember){
	var regex = new RegExp("sdmenu_" + encodeURIComponent(this.menu.id) + "=([01]+)");
	var match = regex.exec(document.cookie);
	if (match){
	var states = match[1].split("");
	for (var i = 0;
	i < states.length;
	i++)this.submenus[i].className = (states[i] == 0 ? "collapsed":"");
}
}
}
;
	SDMenu.prototype.toggleMenu = function(submenu){
	if (submenu.className == "collapsed")this.expandMenu(submenu);
	elsethis.collapseMenu(submenu);
}
;
	SDMenu.prototype.expandMenu = function(submenu){
	var fullHeight = submenu.getElementsByTagName("span")[0].offsetHeight;
	var links = submenu.getElementsByTagName("a");
	for (var i = 0;
	i < links.length;
	i++)fullHeight += links[i].offsetHeight;
	var moveBy = Math.round(this.speed * links.length);
	var mainInstance = this;
	var intId = setInterval(function(){
	var curHeight = submenu.offsetHeight;
	var newHeight = curHeight + moveBy;
	if (newHeight < fullHeight)submenu.style.height = newHeight + "px";
	else{
	clearInterval(intId);
	submenu.style.height = "";
	submenu.className = "";
	mainInstance.memorize();
}
}
,30);
	this.collapseOthers(submenu);
}
;
	SDMenu.prototype.collapseMenu = function(submenu){
	var minHeight = submenu.getElementsByTagName("span")[0].offsetHeight;
	var moveBy = Math.round(this.speed * submenu.getElementsByTagName("a").length);
	var mainInstance = this;
	var intId = setInterval(function(){
	var curHeight = submenu.offsetHeight;
	var newHeight = curHeight - moveBy;
	if (newHeight > minHeight)submenu.style.height = newHeight + "px";
	else{
	clearInterval(intId);
	submenu.style.height = "";
	submenu.className = "collapsed";
	mainInstance.memorize();
}
}
,30);
}
;
	SDMenu.prototype.collapseOthers = function(submenu){
	if (this.oneSmOnly){
	for (var i = 0;
	i < this.submenus.length;
	i++)if (this.submenus[i] != submenu && this.submenus[i].className != "collapsed")this.collapseMenu(this.submenus[i]);
}
}
;
	SDMenu.prototype.expandAll = function(){
	var oldOneSmOnly = this.oneSmOnly;
	this.oneSmOnly = false;
	for (var i = 0;
	i < this.submenus.length;
	i++)if (this.submenus[i].className == "collapsed")this.expandMenu(this.submenus[i]);
	this.oneSmOnly = oldOneSmOnly;
}
;
	SDMenu.prototype.collapseAll = function(){
	for (var i = 0;
	i < this.submenus.length;
	i++)if (this.submenus[i].className != "collapsed")this.collapseMenu(this.submenus[i]);
}
;
	SDMenu.prototype.memorize = function(){
	if (this.remember){
	var states = new Array();
	for (var i = 0;
	i < this.submenus.length;
	i++)states.push(this.submenus[i].className == "collapsed" ? 0:1);
	var d = new Date();
	d.setTime(d.getTime() + (30 * 24 * 60 * 60 * 1000));
	document.cookie = "sdmenu_" + encodeURIComponent(this.menu.id) + "=" + states.join("") + ";
	expires=" + d.toGMTString() + ";
	path=/";
}
}
;

CSS代码(sdmenu.css):

div.sdmenu{width:150px;font-family:Arial,sans-serif;font-size:12px;padding-bottom:10px;background:url(bottom.gif) no-repeat right bottom;color:#fff;}
div.sdmenu div{background:url(title.gif) repeat-x;overflow:hidden;}
div.sdmenu div:first-child{background:url(toptitle.gif) no-repeat;}
div.sdmenu div.collapsed{height:25px;}
div.sdmenu div span{display:block;padding:5px 25px;font-weight:bold;color:white;background:url(expanded.gif) no-repeat 10px center;cursor:default;border-bottom:1px solid #ddd;}
div.sdmenu div.collapsed span{background-image:url(collapsed.gif);}
div.sdmenu div a{padding:5px 10px;background:#eee;display:block;border-bottom:1px solid #ddd;color:#066;}
div.sdmenu div a.current{background:#ccc;}
div.sdmenu div a:hover{background:#066 url(linkarrow.gif) no-repeat right center;color:#fff;text-decoration:none;}

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