可以设置一个一直都显示的二级菜单，修复了没有二级菜单时鼠标移上去仍然显示上一个二级菜单的问题.支持一级菜单鼠标离开事件
复制代码
代码如下:
复制代码
代码如下:
var cssdropdown = {disappeardelay: 250,disablemenuclick: false,enableswipe: 1,enableiframeshim: 1,dropmenuobj: null,ie: document.all,Firefox: document.getElementById && !document.all,swipetimer: undefined,bottomclip: 0,getposOffset: function(what, offsettype) {var totaloffset = (offsettype == "left") ? what.offsetLeft: what.offsetTop;var parentEl = what.offsetParent;while (parentEl != null) {totaloffset = (offsettype == "left") ? totaloffset + parentEl.offsetLeft: totaloffset + parentEl.offsetTop;parentEl = parentEl.offsetParent;}return totaloffset;},swipeeffect: function() {if (this.bottomclip < parseInt(this.dropmenuobj.offsetHeight)) {this.bottomclip += 10 + (this.bottomclip / 10);this.dropmenuobj.style.clip = "rect(0 auto " + this.bottomclip + "px 0)";} else return;this.swipetimer = setTimeout("cssdropdown.swipeeffect()", 10);},//隐藏或者显示二级菜单showhide: function(obj, e) {if (this.ie || this.firefox) this.dropmenuobj.style.left = this.dropmenuobj.style.top = "-500px";if (e.type == "click" && obj.visibility == hidden || e.type == "mouseover") {if (this.enableswipe == 1) {if (typeof this.swipetimer != "undefined") clearTimeout(this.swipetimer);obj.clip = "rect(0 auto 0 0)";this.bottomclip = 0;this.swipeeffect();}obj.visibility = "visible";} else if (e.type == "click") obj.visibility = "hidden";},iecompattest: function() {return (document.compatMode && document.compatMode != "BackCompat") ? document.documentElement: document.body;},clearbrowseredge: function(obj, whichedge) {var edgeoffset = 0;if (whichedge == "rightedge") {var windowedge = this.ie && !window.opera ? this.iecompattest().scrollLeft + this.iecompattest().clientWidth - 15 : window.pageXOffset + window.innerWidth - 15;this.dropmenuobj.contentmeasure = this.dropmenuobj.offsetWidth;if (windowedge - this.dropmenuobj.x < this.dropmenuobj.contentmeasure) edgeoffset = this.dropmenuobj.contentmeasure - obj.offsetWidth;} else {var topedge = this.ie && !window.opera ? this.iecompattest().scrollTop: window.pageYOffset;var windowedge = this.ie && !window.opera ? this.iecompattest().scrollTop + this.iecompattest().clientHeight - 15 : window.pageYOffset + window.innerHeight - 18;this.dropmenuobj.contentmeasure = this.dropmenuobj.offsetHeight;if (windowedge - this.dropmenuobj.y < this.dropmenuobj.contentmeasure) {edgeoffset = this.dropmenuobj.contentmeasure + obj.offsetHeight;if ((this.dropmenuobj.y - topedge) < this.dropmenuobj.contentmeasure) edgeoffset = this.dropmenuobj.y + obj.offsetHeight - topedge;}}return edgeoffset;},//鼠标移动到一级菜单上执行dropit: function(obj, e, dropmenuID) {//隐藏上次显示的二级菜单if (this.dropmenuobj != null) this.dropmenuobj.style.visibility = "hidden";this.clearhidemenu();if (this.ie || this.firefox) {var me = this;//一级菜单鼠标离开事件obj.onmouseout = function() {cssdropdown.delayhidemenu();};//一级菜单鼠标点击事件obj.onclick = function() {return ! cssdropdown.disablemenuclick};if (!dropmenuID) {return;}this.dropmenuobj = document.getElementById(dropmenuID);if (!this.dropmenuobj) return;//为二级菜单绑定鼠标移动到事件this.dropmenuobj.onmouseover = function() {//移除从一级菜单离开时触发的方法，防止误执行cssdropdown.clearhidemenu();}//为二级菜单绑定鼠标离开事件this.dropmenuobj.onmouseout = function(e) {cssdropdown.dynamichide(e);}//为二级菜单绑定鼠标点击事件this.dropmenuobj.onclick = function() {cssdropdown.delayhidemenu();}this.showhide(this.dropmenuobj.style, e);//调整二级菜单位置，以免位置错乱this.dropmenuobj.x = this.getposOffset(obj, "left");this.dropmenuobj.y = this.getposOffset(obj, "top");this.dropmenuobj.style.left = this.dropmenuobj.x - this.clearbrowseredge(obj, "rightedge") + "px";this.dropmenuobj.style.top = this.dropmenuobj.y - this.clearbrowseredge(obj, "bottomedge") + obj.offsetHeight + 1 + "px";this.positionshim();}},positionshim: function() {if (this.enableiframeshim && typeof this.shimobject != "undefined") {if (this.dropmenuobj.style.visibility == "visible") {this.shimobject.style.width = this.dropmenuobj.offsetWidth + "px";this.shimobject.style.height = this.dropmenuobj.offsetHeight + "px";this.shimobject.style.left = this.dropmenuobj.style.left;this.shimobject.style.top = this.dropmenuobj.style.top;}this.shimobject.style.display = (this.dropmenuobj.style.visibility == "visible") ? "block": "none";}},hideshim: function() {if (this.enableiframeshim && typeof this.shimobject != "undefined") this.shimobject.style.display = 'none';},contains_firefox: function(a, b) {while (b.parentNode) if ((b = b.parentNode) == a) return true;return false;},//隐藏二级菜单，兼容性处理dynamichide: function(e) {var evtobj = window.event ? window.event: e;//确认是鼠标离开事件，避免误触发if (this.ie && !this.dropmenuobj.contains(evtobj.toElement)) this.delayhidemenu();else if (this.firefox && e.currentTarget != evtobj.relatedTarget && !this.contains_firefox(evtobj.currentTarget, evtobj.relatedTarget)) this.delayhidemenu();},//鼠标点击菜单，或者离开菜单时执行delayhidemenu: function() {this.delayhide = setTimeout(function() {cssdropdown.dropmenuobj.style.visibility = 'hidden';cssdropdown.hideshim();cssdropdown.showAlways();},this.disappeardelay);},//移除定时方法clearhidemenu: function() {if (this.delayhide != "undefined") clearTimeout(this.delayhide);},//显示默认被选中的一级菜单showAlways: function() {if (this.always) {this.always.onmouseover({type: "mouseover"});}},//初始化startchrome: function() {for (var ids = 0; ids < arguments.length; ids++) {var menuitems = document.getElementById(arguments[ids]).getElementsByTagName("a");for (var i = 0; i < menuitems.length; i++) {var relvalue = menuitems[i].getAttribute("rel");//绑定鼠标移动到事件menuitems[i].onmouseover = function(e) {var event = typeof e != "undefined" ? e: window.event;cssdropdown.dropit(this, event, this.getAttribute("rel"));};//显示默认被选中的一级菜单if (!this.always && menuitems[i].parentNode.getAttribute("class") == "navselect") {this.always = menuitems[i];this.showAlways();}}}if (window.createPopup && !window.XmlHttpRequest) {document.write('');this.shimobject = document.getElementById("iframeshim");}}}
发表评论