js 通过cookie实现刷新不变化树形菜单
通过设置cookie来保存树形菜单的状态,在页面加载时重新读取cookie来设置菜单。
菜单的HTML结构:
<divclass="treemenu"> <ul> <li> <ahref="#"id="treemenu_a_1">一级菜单一</a> <divclass="submenu"id="submenu_1"> <ul> <li><ahref="subpage/a.html"id="submenu_a_1_1">二级菜单一</a></li> <li><ahref="subpage/b.html"id="submenu_a_1_2">二级菜单二</a></li> <li><ahref="#"id="submenu_a_1_3">二级菜单三</a></li> <li><ahref="#"id="submenu_a_1_4">二级菜单四</a></li> <li><ahref="#"id="submenu_a_1_5">二级菜单五</a></li> </ul> </div> </li> <li> <ahref="#"id="treemenu_a_2">一级菜单二</a> <divclass="submenu"id="submenu_2"> <ul> <li> <ahref="#"id="submenu_a_2_1">二级菜单一</a> <divclass="submenu"id="submenu_2_1"> <ul> <li><ahref="#"id="submenu_a_2_1_1">三级菜单一</a></li> <li><ahref="#"id="submenu_a_2_1_2">三级菜单二</a></li> <li> <ahref="#"id="submenu_a_2_1_3">三级菜单三</a> <divclass="submenu"id="submenu_2_1_3"> <ul> <li><ahref="#"id="submenu_a_2_1_3_1">四级菜单一</a></li> <li><ahref="#"id="submenu_a_2_1_3_2">四级菜单二</a></li> <li><ahref="#"id="submenu_a_2_1_3_3">四级菜单三</a></li> </ul> </div> </li> </ul> </div> </li> <li><ahref="#"id="submenu_a_2_2">二级菜单二</a></li> <li><ahref="#"id="submenu_a_2_3">二级菜单三</a></li> <li><ahref="#"id="submenu_a_2_4">二级菜单四</a></li> <li><ahref="#"id="submenu_a_2_5">二级菜单五</a></li> </ul> </div> </li> <li> <ahref="#"id="treemenu_a_3">一级菜单三</a> <divclass="submenu"id="submenu_3"> <ul> <li><ahref="#"id="submenu_a_3_1">二级菜单一</a></li> <li><ahref="#"id="submenu_a_3_2">二级菜单二</a></li> <li><ahref="#"id="submenu_a_3_3">二级菜单三</a></li> <li><ahref="#"id="submenu_a_3_4">二级菜单四</a></li> <li><ahref="#"id="submenu_a_3_5">二级菜单五</a></li> </ul> </div> </li> </ul> </div>
读取cookie工具类:
//cookie工具类 varcookieTool={ //读取cookie getCookie:function(c_name){ if(document.cookie.length>0){ c_start=document.cookie.indexOf(c_name+"="); if(c_start!=-1){ c_start=c_start+c_name.length+1; c_end=document.cookie.indexOf(";",c_start); if(c_end==-1){ c_end=document.cookie.length; } returnunescape(document.cookie.substring(c_start,c_end)); } } return""; }, //设置cookie setCookie:function(c_name,value,expiredays){ varexdate=newDate(); exdate.setDate(exdate.getDate()+expiredays);//设置日期 document.cookie=c_name+"="+escape(value)+((expiredays==null)?"":";expires="+exdate.toGMTString()); }, //删除cookie delCookie:function(c_name){ varexdate=newDate(); exdate.setDate(exdate.getDate()-1);//昨天日期 document.cookie=c_name+"=;expires="+exdate.toGMTString(); } };
菜单事件绑定:
//菜单事件绑定 $('.treemenua').bind('click',function(){ var$this=$(this); varid=$this.attr('id'); var$submenu=$this.next('.submenu'); if($submenu.length>0){//是否有子菜单 varflag=$(this).next('.submenu:hidden').length>0?true:false; if(flag){ $submenu.show(); }else{ $submenu.hide(); } vardisplay=flag?'block':'none'; cookieTool.setCookie(id,display,10); }else{ cookieTool.setCookie(id,id,10); varcurId=cookieTool.getCookie(id); $('.treemenu').find('.on').removeClass('on').addClass('off'); $('#'+curId).addClass('on'); $('.treemenua[class="off"]').each(function(){ cookieTool.delCookie($(this).attr('id'));//删除其他已选择选项cookie }); } });
页面加载时重新设置菜单
//页面加载读取cookies $('.treemenua').each(function(){ showMenu($(this).attr('id')); }); //读取cookie显示菜单 functionshowMenu(id){ var$this=$('#'+id); varcookie=cookieTool.getCookie(id); if(cookie){ if($this.next('.submenu').length>0){ $this.next('.submenu').css('display',cookie); }else{ $('#'+cookie).addClass('on'); } } }
完整DEMO:
【JavaScript】刷新不变化树形菜单(多级菜单).zip
注意:chrome本地控制台无法读取cookie,需要在firefox/IE或者服务器环境下测试