适合于后台使用的动画折叠菜单

2024-09-05 12:20:40

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适合于后台使用的动画折叠菜单，代码超简，无jQuery，展开与折叠效果平滑。本演示中有两组菜单，向大家展示如何在一个网页中布局两个菜单，整体效果以及兼容性还算可以，希望在实际应用中不会出现什么问题。

<!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>适合于后台使用的动画折叠菜单</title><script type="text/javascript">	function FOLDMenu(id,onlyone){		if(!document.getElementById || !document.getElementsByTagName){return false;}		this.menu=document.getElementById(id);		this.submenu=this.menu.getElementsByTagName("ul");		this.speed=3;		this.time=10;		this.onlyone=onlyone==true?onlyone:false;		this.links = this.menu.getElementsByTagName("a");	}	FOLDMenu.prototype.init=function(){		var mainInstance = this;		for(var i=0;i<this.submenu.length;i++){			this.submenu[i].getElementsByTagName("span")[0].onclick=function(){				mainInstance.toogleMenu(this.parentNode);			};		}		for(var i=0;i<this.links.length;i++){			this.links[i].onclick=function(){				this.className = "current";				mainInstance.removeCurrent(this);			}		}	}	FOLDMenu.prototype.removeCurrent = function(link){			for (var i = 0; i < this.links.length; i++){				if (this.links[i] != link){					this.links[i].className = " "; 				}			}	}	FOLDMenu.prototype.toogleMenu=function(submenu){		if(submenu.className=="open"){			this.closeMenu(submenu);		}else{			this.openMenu(submenu);		}	}	FOLDMenu.prototype.openMenu=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 = "open";					} 				}, this.time); 				this.collapseOthers(submenu);	}		FOLDMenu.prototype.closeMenu=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 = "";					} 				}, this.time); 	}    	FOLDMenu.prototype.collapseOthers = function(submenu){		if(this.onlyone){			for (var i = 0; i < this.submenu.length; i++){				if (this.submenu[i] != submenu){					this.closeMenu(this.submenu[i]); 				}			}		}	}</script><style type="text/css">*{margin:0;padding:0;}.foldmenu{border:1px solid #000;width:150px;margin:50px;}.foldmenu ul{list-style-type:none;height:25px;line-height:25px;overflow:hidden;cursor:pointer;}.foldmenu ul.open{height:auto;}.foldmenu ul span{display:block;padding-left:5px}.foldmenu ul li{border-bottom:1px solid #DDDDDD;}.foldmenu li a{background-color:#EEEEEE;color:#006666;display:block;padding:5px 10px;text-decoration:none;text-align:center;}.foldmenu li a:hover{background-color:#006666;color:#ffffff;}.foldmenu li a.current{background-color:#006666;color:#ffffff;}</style></head><body><div id="foldmenu" class="foldmenu" style="float:left;">	<ul class="open">    	<span>编程天地</span>        <li>电子书籍</li>        <li>源码乐园</li>    </ul>	<ul>    	<span>中国门户</span>        <li>百度搜索</li>        <li>新浪新闻</li>		<li>腾讯QQ</li>    </ul>	<ul>    	<span>音乐网站</span>        <li>百度音乐</li>        <li>QQ163</li>    </ul></div><div id="foldmenu2" class="foldmenu" style="float:right;">	<ul class="open">    	<span>世界大学</span>        <li>剑桥</li>        <li>牛津</li>		<li>哈佛</li>        <li>麻省理工</li>    </ul>	<ul>    	<span>中国大学</span>        <li>北大</li>        <li>清华</li>		<li>港大</li>    </ul>	<ul>    	<span>世界好车</span>        <li>宝马</li>        <li>奔驰</li>        <li>奥迪</li>    </ul>	<ul>    	<span>开源论坛</span>        <li>PhpWind</li>        <li>Discuz!</li>    </ul></div><script type="text/javascript">window.onload = function() {	myMenu = new FOLDMenu("foldmenu",true);	myMenu.init();	myMenu2 = new FOLDMenu("foldmenu2");	myMenu2.init();};</script></body></html>

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