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