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:

 1 <div class="treemenu">
 2          <ul>
 3              <li>
 4                  <a href="#" id="treemenu_a_1">一级菜单一</a>
 5                  <div class="submenu" id="submenu_1">
 6                      <ul>
 7                          <li><a href="subpage/a.html" id="submenu_a_1_1">二级菜单一</a></li>
 8                          <li><a href="subpage/b.html" id="submenu_a_1_2">二级菜单二</a></li>
 9                          <li><a href="#" id="submenu_a_1_3">二级菜单三</a></li>
10                          <li><a href="#" id="submenu_a_1_4">二级菜单四</a></li>
11                          <li><a href="#" id="submenu_a_1_5">二级菜单五</a></li>
12                      </ul>
13                  </div>
14              </li>
15              <li>
16                  <a href="#" id="treemenu_a_2">一级菜单二</a>
17                  <div class="submenu" id="submenu_2">
18                      <ul>
19                          <li>
20                              <a href="#" id="submenu_a_2_1">二级菜单一</a>
21                             <div class="submenu" id="submenu_2_1">
22                                 <ul>
23                                     <li><a href="#" id="submenu_a_2_1_1">三级菜单一</a></li>
24                                     <li><a href="#" id="submenu_a_2_1_2">三级菜单二</a></li>
25                                     <li>
26                                         <a href="#" id="submenu_a_2_1_3">三级菜单三</a>
27                                         <div class="submenu" id="submenu_2_1_3">
28                                             <ul>
29                                                 <li><a href="#" id="submenu_a_2_1_3_1">四级菜单一</a></li>
30                                                 <li><a href="#" id="submenu_a_2_1_3_2">四级菜单二</a></li>
31                                                 <li><a href="#" id="submenu_a_2_1_3_3">四级菜单三</a></li>
32                                             </ul>
33                                         </div>
34                                     </li>
35                                 </ul>
36                             </div>
37                          </li>
38                          <li><a href="#" id="submenu_a_2_2">二级菜单二</a></li>
39                          <li><a href="#" id="submenu_a_2_3">二级菜单三</a></li>
40                          <li><a href="#" id="submenu_a_2_4">二级菜单四</a></li>
41                          <li><a href="#" id="submenu_a_2_5">二级菜单五</a></li>
42                      </ul>
43                  </div>
44              </li>
45              <li>
46                  <a href="#" id="treemenu_a_3">一级菜单三</a>
47                  <div class="submenu" id="submenu_3">
48                      <ul>
49                          <li><a href="#" id="submenu_a_3_1">二级菜单一</a></li>
50                          <li><a href="#" id="submenu_a_3_2">二级菜单二</a></li>
51                          <li><a href="#" id="submenu_a_3_3">二级菜单三</a></li>
52                          <li><a href="#" id="submenu_a_3_4">二级菜单四</a></li>
53                          <li><a href="#" id="submenu_a_3_5">二级菜单五</a></li>
54                      </ul>
55                  </div>
56              </li>
57          </ul>
58      </div>
View Code

 

读取cookie工具类:

 1 //cookie工具类
 2 var cookieTool = {
 3     //读取cookie
 4     getCookie: function(c_name) {
 5         if (document.cookie.length > 0) {
 6             c_start = document.cookie.indexOf(c_name + "=");
 7             if (c_start != -1) {
 8                 c_start = c_start + c_name.length + 1;
 9                 c_end = document.cookie.indexOf(";", c_start);
10                 if (c_end == -1) {
11                     c_end = document.cookie.length;
12                 }
13                 return unescape(document.cookie.substring(c_start, c_end));
14             }
15         }
16         return "";
17     },
18     //设置cookie
19     setCookie: function(c_name, value, expiredays) {
20         var exdate = new Date();
21         exdate.setDate(exdate.getDate() + expiredays); //设置日期
22         document.cookie = c_name + "=" + escape(value) + ((expiredays == null) ? "" : ";expires=" + exdate.toGMTString());
23     },
24     //删除cookie
25     delCookie: function(c_name) {
26         var exdate = new Date();
27         exdate.setDate(exdate.getDate() - 1); //昨天日期
28         document.cookie = c_name + "=;expires=" + exdate.toGMTString();
29     }
30 };
View Code

菜单事件绑定:

 1 //菜单事件绑定
 2     $('.treemenu a').bind('click', function() {
 3         var $this = $(this);
 4         var id = $this.attr('id');
 5         var $submenu = $this.next('.submenu');
 6         if ($submenu.length > 0) { //是否有子菜单
 7             var flag = $(this).next('.submenu:hidden').length > 0 ? true : false;
 8             if (flag) {
 9                 $submenu.show();
10             } else {
11                 $submenu.hide();
12             }
13             var display = flag ? 'block' : 'none';
14             cookieTool.setCookie(id, display, 10);
15         } else {
16             cookieTool.setCookie(id, id, 10);
17             var curId = cookieTool.getCookie(id);
18             $('.treemenu').find('.on').removeClass('on').addClass('off');
19             $('#' + curId).addClass('on');
20             $('.treemenu a[class="off"]').each(function() { 
21                 cookieTool.delCookie($(this).attr('id')); //删除其他已选择选项cookie
22             });
23         }
24     });
View Code

页面加载时重新设置菜单

 1 //页面加载读取cookies
 2     $('.treemenu a').each(function() {
 3         showMenu($(this).attr('id'));
 4     });
 5 
 6 
 7 //读取cookie显示菜单
 8 function showMenu(id) {
 9     var $this = $('#' + id);
10     var cookie = cookieTool.getCookie(id);
11     if (cookie) {
12         if ($this.next('.submenu').length > 0) {
13             $this.next('.submenu').css('display', cookie);
14         } else {
15             $('#' + cookie).addClass('on');
16         }
17     }
18 }

 

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

posted @ 2014-10-30 11:54 -Aaron- 阅读(...) 评论(...) 编辑 收藏