像论坛上用的鼠标感应菜单，带阴影_菜单导航特效

带阴影效果的仿论坛感应菜单，在discuz论坛程序中，大家都比较熟悉就是在登录后会有一个用户导航，鼠标放上后，显示出更加详细的导航，这个菜单就实现这样一种效果，它同时还封装了一个实现本效果的类，大家都可方便使用，代码中的类你可单独拷贝出来保存为新的JS文件。

<title>像论坛上用的鼠标感应菜单，JavaScript代码</title>
<script type="text/javascript">
var lang = new Array();
var userAgent = navigator.userAgent.toLowerCase();
var is_opera = userAgent.indexOf('opera') != -1 && opera.version();
var is_moz = (navigator.product == 'Gecko') && userAgent.substr(userAgent.indexOf('firefox') + 8, 3);
var is_ie = (userAgent.indexOf('msie') != -1 && !is_opera) && userAgent.substr(userAgent.indexOf('msie') + 5, 3);
function $(id) {
	return document.getElementById(id);
}

function doane(event) {
	e = event ? event : window.event;
	if(is_ie) {
		e.returnValue = false;
		e.cancelBubble = true;
	} else if(e) {
		e.stopPropagation();
		e.preventDefault();
	}
}

function fetchCheckbox(cbn) {
	return $(cbn) && $(cbn).checked == true ? 1 : 0;
}

function getcookie(name) {
	var cookie_start = document.cookie.indexOf(name);
	var cookie_end = document.cookie.indexOf(";", cookie_start);
	return cookie_start == -1 ? '' : unescape(document.cookie.substring(cookie_start + name.length + 1, (cookie_end > cookie_start ? cookie_end : document.cookie.length)));
}

function imgzoom(obj) {}

function in_array(needle, haystack) {
	if(typeof needle == 'string' || typeof needle == 'number') {
		for(var i in haystack) {
			if(haystack[i] == needle) {
					return true;
			}
		}
	}
	return false;
}

function setcopy(text, alertmsg){
	if(is_ie) {
		clipboardData.setData('Text', text);
		alert(alertmsg);
	} else if(prompt('Press Ctrl+C Copy to Clipboard', text)) {
		alert(alertmsg);
	}
}

function isUndefined(variable) {
	return typeof variable == 'undefined' ? true : false;
}

function mb_strlen(str) {
	var len = 0;
	for(var i = 0; i < str.length; i++) {
		len += str.charCodeAt(i) < 0 || str.charCodeAt(i) > 255 ? (charset == 'utf-8' ? 3 : 2) : 1;
	}
	return len;
}

function setcookie(cookieName, cookieValue, seconds, path, domain, secure) {
	var expires = new Date();
	expires.setTime(expires.getTime() + seconds);
	document.cookie = escape(cookieName) + '=' + escape(cookieValue)
		+ (expires ? '; expires=' + expires.toGMTString() : '')
		+ (path ? '; path=' + path : '/')
		+ (domain ? '; domain=' + domain : '')
		+ (secure ? '; secure' : '');
}

function strlen(str) {
	return (is_ie && str.indexOf('\n') != -1) ? str.replace(/\r?\n/g, '_').length : str.length;
}

function updatestring(str1, str2, clear) {
	str2 = '_' + str2 + '_';
	return clear ? str1.replace(str2, '') : (str1.indexOf(str2) == -1 ? str1 + str2 : str1);
}

function toggle_collapse(objname, noimg) {
	var obj = $(objname);
	obj.style.display = obj.style.display == '' ? 'none' : '';
	if(!noimg) {
		var img = $(objname + '_img');
		img.src = img.src.indexOf('_yes.gif') == -1 ? img.src.replace(/_no\.gif/, '_yes\.gif') : img.src.replace(/_yes\.gif/, '_no\.gif');
	}
	var collapsed = getcookie('discuz_collapse');
	collapsed =  updatestring(collapsed, objname, !obj.style.display);
	setcookie('discuz_collapse', collapsed, (collapsed ? 86400 * 30 : -(86400 * 30 * 1000)));
}

function trim(str) {
	return (str + '').replace(/(\s+)$/g, '').replace(/^\s+/g, '');
}

function _attachEvent(obj, evt, func) {
	if(obj.addEventListener) {
		obj.addEventListener(evt, func, false);
	} else if(obj.attachEvent) {
		obj.attachEvent("on" + evt, func);
	}
}

var jsmenu = new Array();
var ctrlobjclassName;
jsmenu['active'] = new Array();
jsmenu['timer'] = new Array();
jsmenu['iframe'] = new Array();

function initCtrl(ctrlobj, click, duration, timeout, layer) {
	if(ctrlobj && !ctrlobj.initialized) {
		ctrlobj.initialized = true;
		ctrlobj.unselectable = true;

ctrlobj.outfunc = typeof ctrlobj.onmouseout == 'function' ? ctrlobj.onmouseout : null;
		ctrlobj.onmouseout = function() {
			if(this.outfunc) this.outfunc();
			if(duration < 3) jsmenu['timer'][ctrlobj.id] = setTimeout('hideMenu(' + layer + ')', timeout);
		}

ctrlobj.overfunc = typeof ctrlobj.onmouseover == 'function' ? ctrlobj.onmouseover : null;
		ctrlobj.onmouseover = function(e) {
			doane(e);
			if(this.overfunc) this.overfunc();
			if(click) {
				clearTimeout(jsmenu['timer'][this.id]);
			} else {
				for(var id in jsmenu['timer']) {
					if(jsmenu['timer'][id]) clearTimeout(jsmenu['timer'][id]);
				}
			}
		}
	}
}

function showMenu(ctrlid, click, offset, duration, timeout, layer, showid, maxh, drag) {
	var ctrlobj = $(ctrlid);
	if(!ctrlobj) return;
	if(isUndefined(click)) click = false;
	if(isUndefined(offset)) offset = 0;
	if(isUndefined(duration)) duration = 2;
	if(isUndefined(timeout)) timeout = 500;
	if(isUndefined(layer)) layer = 0;
	if(isUndefined(showid)) showid = ctrlid;
	var showobj = $(showid);
	var menuobj = $(showid + '_menu');
	if(!showobj|| !menuobj) return;
	if(isUndefined(maxh)) maxh = 400;
	if(isUndefined(drag)) drag = false;

if(click && jsmenu['active'][layer] == menuobj) {
		hideMenu(layer);
		return;
	} else {
		hideMenu(layer);
	}

var len = jsmenu['timer'].length;
	if(len > 0) {
		for(var i=0; i<len; i++) {
			if(jsmenu['timer'][i]) clearTimeout(jsmenu['timer'][i]);
		}
	}

initCtrl(ctrlobj, click, duration, timeout, layer);
	ctrlobjclassName = ctrlobj.className;
	ctrlobj.className += ' hover';
	initMenu(ctrlid, menuobj, duration, timeout, layer, drag);

menuobj.style.display = '';
	if(maxh && menuobj.scrollHeight > maxh) {
		menuobj.style.height = maxh + 'px';
		if(is_opera) {
			menuobj.style.overflow = 'auto';
		} else {
			menuobj.style.overflowY = 'auto';
		}
	}

if(!is_opera) {
		menuobj.style.clip = 'rect(auto, auto, auto, auto)';
	}

setMenuPosition(showid, offset);

if(is_ie && is_ie < 7) {
		if(!jsmenu['iframe'][layer]) {
			var iframe = document.createElement('iframe');
			iframe.style.display = 'none';
			iframe.style.position = 'absolute';
			iframe.style.filter = 'progid:DXImageTransform.Microsoft.Alpha(style=0,opacity=0)';
			$('append_parent') ? $('append_parent').appendChild(iframe) : menuobj.parentNode.appendChild(iframe);
			jsmenu['iframe'][layer] = iframe;
		}
		jsmenu['iframe'][layer].style.top = menuobj.style.top;
		jsmenu['iframe'][layer].style.left = menuobj.style.left;
		jsmenu['iframe'][layer].style.width = menuobj.w;
		jsmenu['iframe'][layer].style.height = menuobj.h;
		jsmenu['iframe'][layer].style.display = 'block';
	}

if(!duration) {
		setTimeout('hideMenu(' + layer + ')', timeout);
	}

jsmenu['active'][layer] = menuobj;
}

function menuoption_onclick_function(e) {
	this.clickfunc();
	hideMenu();
}

function menuoption_onclick_link(e) {
	choose(e, this);
}

function menuoption_onmouseover(e) {
	this.className = 'popupmenu_highlight';
}

function menuoption_onmouseout(e) {
	this.className = 'popupmenu_option';
}

function smiletypescroll(direct) {
	if(direct == 0) {
		$('smileytypes').scrollTop -= 28;
	} else {
		$('smileytypes').scrollTop += 28;
	}
}

var Ajaxs = new Array();
var AjaxStacks = new Array(0, 0, 0, 0, 0, 0, 0, 0, 0, 0);
var attackevasive = isUndefined(attackevasive) ? 0 : attackevasive;
function Ajax(recvType, waitId) {

for(var stackId = 0; stackId < AjaxStacks.length && AjaxStacks[stackId] != 0; stackId++);
	AjaxStacks[stackId] = 1;

var aj = new Object();

aj.loading = 'Loading...';//public
	aj.recvType = recvType ? recvType : 'XML';//public
	aj.waitId = waitId ? $(waitId) : null;//public

aj.resultHandle = null;//private
	aj.sendString = '';//private
	aj.targetUrl = '';//private
	aj.stackId = 0;
	aj.stackId = stackId;

aj.setLoading = function(loading) {
		if(typeof loading !== 'undefined' && loading !== null) aj.loading = loading;
	}

aj.setRecvType = function(recvtype) {
		aj.recvType = recvtype;
	}

aj.setWaitId = function(waitid) {
		aj.waitId = typeof waitid == 'object' ? waitid : $(waitid);
	}

aj.createXMLHttpRequest = function() {
		var request = false;
		if(window.XMLHttpRequest) {
			request = new XMLHttpRequest();
			if(request.overrideMimeType) {
				request.overrideMimeType('text/xml');
			}
		} else if(window.ActiveXObject) {
			var versions = ['Microsoft.XMLHTTP', 'MSXML.XMLHTTP', 'Microsoft.XMLHTTP', 'Msxml2.XMLHTTP.7.0', 'Msxml2.XMLHTTP.6.0', 'Msxml2.XMLHTTP.5.0', 'Msxml2.XMLHTTP.4.0', 'MSXML2.XMLHTTP.3.0', 'MSXML2.XMLHTTP'];
			for(var i=0; i<versions.length; i++) {
				try {
					request = new ActiveXObject(versions[i]);
					if(request) {
						return request;
					}
				} catch(e) {}
			}
		}
		return request;
	}

aj.XMLHttpRequest = aj.createXMLHttpRequest();
	aj.showLoading = function() {
		if(aj.waitId && (aj.XMLHttpRequest.readyState != 4 || aj.XMLHttpRequest.status != 200)) {
			changedisplay(aj.waitId, '');
			aj.waitId.innerHTML = '<span><img src="' + IMGDIR + '/loading.gif"> ' + aj.loading + '</span>';
		}
	}

aj.processHandle = function() {
		if(aj.XMLHttpRequest.readyState == 4 && aj.XMLHttpRequest.status == 200) {
			for(k in Ajaxs) {
				if(Ajaxs[k] == aj.targetUrl) {
					Ajaxs[k] = null;
				}
			}
			if(aj.waitId) changedisplay(aj.waitId, 'none');
			if(aj.recvType == 'HTML') {
				aj.resultHandle(aj.XMLHttpRequest.responseText, aj);
			} else if(aj.recvType == 'XML') {
				aj.resultHandle(aj.XMLHttpRequest.responseXML.lastChild.firstChild.nodeValue, aj);
			}
			AjaxStacks[aj.stackId] = 0;
		}
	}

aj.get = function(targetUrl, resultHandle) {

setTimeout(function(){aj.showLoading()}, 500);
		if(in_array(targetUrl, Ajaxs)) {
			return false;
		} else {
			Ajaxs.push(targetUrl);
		}
		aj.targetUrl = targetUrl;
		aj.XMLHttpRequest.onreadystatechange = aj.processHandle;
		aj.resultHandle = resultHandle;
		var delay = attackevasive & 1 ? (aj.stackId + 1) * 1001 : 100;
		if(window.XMLHttpRequest) {
			setTimeout(function(){
			aj.XMLHttpRequest.open('GET', aj.targetUrl);
			aj.XMLHttpRequest.send(null);}, delay);
		} else {
			setTimeout(function(){
			aj.XMLHttpRequest.open("GET", targetUrl, true);
			aj.XMLHttpRequest.send();}, delay);
		}

}
	aj.post = function(targetUrl, sendString, resultHandle) {
		setTimeout(function(){aj.showLoading()}, 500);
		if(in_array(targetUrl, Ajaxs)) {
			return false;
		} else {
			Ajaxs.push(targetUrl);
		}
		aj.targetUrl = targetUrl;
		aj.sendString = sendString;
		aj.XMLHttpRequest.onreadystatechange = aj.processHandle;
		aj.resultHandle = resultHandle;
		aj.XMLHttpRequest.open('POST', targetUrl);
		aj.XMLHttpRequest.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
		aj.XMLHttpRequest.send(aj.sendString);
	}
	return aj;
}

function newfunction(func){
	var args = new Array();
	for(var i=1; i<arguments.length; i++) args.push(arguments[i]);
	return function(event){
		doane(event);
		window[func].apply(window, args);
		return false;
	}
}

function changedisplay(obj, display) {
	if(display == 'auto') {
		obj.style.display = obj.style.display == '' ? 'none' : '';
	} else {
		obj.style.display = display;
	}
	return false;
}

function appendscript(src, text, reload, charset) {
	var id = hash(src + text);
	if(!reload && in_array(id, evalscripts)) return;
	if(reload && $(id)) {
		$(id).parentNode.removeChild($(id));
	}

evalscripts.push(id);
	var scriptNode = document.createElement("script");
	scriptNode.type = "text/javascript";
	scriptNode.id = id;
	scriptNode.charset = charset;
	try {
		if(src) {
			scriptNode.src = src;
		} else if(text){
			scriptNode.text = text;
		}
		$('append_parent').appendChild(scriptNode);
	} catch(e) {}
}

function stripscript(s) {
	return s.replace(/<script.*?>.*?<\/script>/ig, '');
}

function ajaxupdateevents(obj, tagName) {
	tagName = tagName ? tagName : 'A';
	var objs = obj.getElementsByTagName(tagName);
	for(k in objs) {
		var o = objs[k];
		ajaxupdateevent(o);
	}
}

/*
 *@ url: 需求请求的 url
 *@ id : 显示的 id
 *@ waitid: 等待的 id，默认为显示的 id，如果 waitid 为空字符串，则不显示 loading...， 如果为 null，则在 showid 区域显示
 *@ linkid: 是哪个链接触发的该 ajax 请求，该对象的属性(如 ajaxdisplay)保存了一些 ajax 请求过程需要的数据。
*/
function ajaxget(url, showid, waitid, loading, display, recall) {
	waitid = typeof waitid == 'undefined' || waitid === null ? showid : waitid;
	var x = new Ajax();
	x.setLoading(loading);
	x.setWaitId(waitid);
	x.display = typeof display == 'undefined' || display == null ? '' : display;
	x.showId = $(showid);
	if(x.showId) x.showId.orgdisplay = typeof x.showId.orgdisplay === 'undefined' ? x.showId.style.display : x.showId.orgdisplay;

if(url.substr(strlen(url) - 1) == '#') {
		url = url.substr(0, strlen(url) - 1);
		x.autogoto = 1;
	}

var ajaxpostHandle = 0;
function ajaxpost(formid, showid, waitid) {
	showloading();
	var waitid = typeof waitid == 'undefined' || waitid === null ? showid : (waitid !== '' ? waitid : '');

if(ajaxpostHandle != 0) {
		return false;
	}
	var ajaxframeid = 'ajaxframe';
	var ajaxframe = $(ajaxframeid);
	if(ajaxframe == null) {
		if (is_ie && !is_opera) {
			ajaxframe = document.createElement("<iframe name='" + ajaxframeid + "' id='" + ajaxframeid + "'></iframe>");
		} else {
			ajaxframe = document.createElement("iframe");
			ajaxframe.name = ajaxframeid;
			ajaxframe.id = ajaxframeid;
		}
		//ajaxframe.id = ajaxframeid;
		ajaxframe.style.display = 'none';
		$('append_parent').appendChild(ajaxframe);

}
	$(formid).target = ajaxframeid;
	ajaxpostHandle = [showid, ajaxframeid, formid, $(formid).target];
	if(ajaxframe.attachEvent) {
		ajaxframe.detachEvent ('onload', ajaxpost_load);
		ajaxframe.attachEvent('onload', ajaxpost_load);
	} else {
		document.removeEventListener('load', ajaxpost_load, true);
		ajaxframe.addEventListener('load', ajaxpost_load, false);
	}
	$(formid).submit();
	return false;
	//$(waitid).innerHTML = 'Loading...';
}

//得到一个定长的hash值， 依赖于 stringxor()
function hash(string, length) {
	var length = length ? length : 32;
	var start = 0;
	var i = 0;
	var result = '';
	filllen = length - string.length % length;
	for(i = 0; i < filllen; i++){
		string += "0";
	}
	while(start < string.length) {
		result = stringxor(result, string.substr(start, length));
		start += length;
	}
	return result;
}

function stringxor(s1, s2) {
	var s = '';
	var hash = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
	var max = Math.max(s1.length, s2.length);
	for(var i=0; i<max; i++) {
		var k = s1.charCodeAt(i) ^ s2.charCodeAt(i);
		s += hash.charAt(k % 52);
	}
	return s;
}

function showloading(display, waiting) {
	var display = display ? display : 'block';
	var waiting = waiting ? waiting : 'Loading...';
	$('ajaxwaitid').innerHTML = waiting;
	$('ajaxwaitid').style.display = display;
}

function pmchecknew() {
	ajaxget('pm.php?checknewpm=' + Math.random(), 'pmnotice', 'ajaxwaitid');
}

function runCode(obj) {
        var winname = window.open('', "_blank", '');
        winname.document.open('text/html', 'replace');
	winname.opener = null // 防止代码对论谈页面修改
        winname.document.write(obj.value);
        winname.document.close();
}
function saveCode(obj) {
        var winname = window.open('', '_blank', 'top=10000');
        winname.document.open('text/html', 'replace');
        winname.document.write(obj.value);
        winname.document.execCommand('saveas','','code.htm');
        winname.close();
}
</script>
<ul class="popupmenu_popup headermenu_popup" id="my_menu" style="display: none">
		<li><a href="#">我的话题</a></li>
		<li><a href="#">我的收藏</a></li>
		<li><a href="#" target="_blank">我的空间</a></li>
		</ul>
	<span id="my" class="dropmenu" onmouseover="showMenu(this.id)"><a href="#">我的菜单</a></span>

所属频道：菜单导航特效/更新时间：2011-02-24

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