js实现目录树

第一步：HTML结构

1 <div class="folderDiv">
2    <p>目录</p>
3    <ul class="folder"></ul>
4 </div>

第二步：CSS样式

1 /*目录树*/
2 .folderDiv {width: 14%;float: left;height: auto;overflow: auto;border:1px solid #ccc;border-top:2px solid #15a4fa;}
3 .folderDiv p{height: 25px;padding-left: 6px;line-height: 25px;}
4 .folderDiv .folder{width: 100%;height:396px;}
5 .folder li {list-style: none;}
6 .folder li span{display: inline-block;height: 25px;line-height: 25px;padding-left: 14px;font-size: 12px;white-space: nowrap;}
7 .folder li span:hover{cursor: pointer;}

第三步：JS函数

  1 //创建目录树
  2 folderAjax();
  3 //ajax请求
  4 function folderAjax() {
  5     var folder; //用于接收后台获取的目录树对象
  6     var folder_span; //ajax获取目录树下的所有span数量,最后赋值给folder_span_click
  7     var folder_span_click; //目录树点击
  8     $.ajax({
  9         type: "post",
 10         url: "/datawarning/warningCreate/getFolderInfoList ",
 11         async: true,
 12         success: function(res) {
 13             folder = res.beans; //当前目录树存在的对象
 14 
 15             //重置目录树内容
 16             $('.folder').html('');
 17             var span = $('<span></span>')
 18             var li = $('<li></li>');
 19             li.append(span);
 20             $('.folder').append(li);
 21 
 22             //获得目录树级数
 23             var folderLevelCode_Array = [];
 24             for(var i = 0; i < folder.length; i++) {
 25                 if(folderLevelCode_Array.indexOf(folder[i].folderLevelCode) == -1) {
 26                     folderLevelCode_Array.push(folder[i].folderLevelCode);
 27                 }
 28             }
 29 
 30             /*按照目录级别排序后的数组*/
 31             function compare(property) {
 32                 return function(a, b) {
 33                     var value1 = a[property];
 34                     var value2 = b[property];
 35                     return value1 - value2;
 36                 }
 37             }
 38             /*目录级别排序排序*/
 39             folderLevelCode_Array.sort();
 40             //按目录层级排序目录树
 41             folder.sort(compare('folderLevelCode'));
 42             //按目录ID排序目录树
 43             folder.sort(compare('folderId'));
 44 
 45             //设置父元素自定义属性作upperFolderId
 46             $('.folder').children('li').children('span').attr('data-folderId', folder[0].upperFolderId);
 47 
 48             /*子目录级别计算*/
 49             for(var m = 0; m < folder.length; m++) {
 50                 //找到父级目录元素
 51                 var parent = $("[data-folderId=" + folder[m].upperFolderId + "]");
 52                 var span = $('<span></span>');
 53                 var ul = $('<ul></ul>');
 54                 ul.css('margin-left', 20 + 'px').css('display', 'none');
 55                 var li = $('<li></li>');
 56                 /*添加目录树信息*/
 57                 span.html(folder[m].folderName);
 58                 span.attr('data-folderId', folder[m].folderId);
 59                 span.attr('data-folderLevelCode', folder[m].folderLevelCode);
 60                 span.attr('data-upperFolderId', folder[m].upperFolderId);
 61                 li.append(span);
 62                 ul.append(li);
 63                 parent.parent().append(ul);
 64             }
 65 
 66             //显示一级目录
 67             $('.folder').children('li').children('ul').css('display', 'block');
 68             //获取所有span标签
 69             folder_span = $('.folder').find('span');
 70 
 71             //去除第一个标签元素，从下标1开始循环
 72             for(var z = 1; z < folder_span.length; z++) {
 73                 if(folder_span.eq(z).parent().children().length >= 2) {
 74                     folder_span.eq(z).css('background', 'url(src/assets/img/right_15a4fa_12px.png) no-repeat left center');
 75                     folder_span.eq(z).parent().parent().insertAfter(folder_span.eq(z).parent().parent().parent().parent().children('li').children('span')); //排序目录树
 76                 }
 77             }
 78 
 79             //目录树样式设置
 80             $('.folder').children('li').children('span').css('display', 'none')
 81             $('.folder').children('li').children('ul').css('margin-left', '5px')
 82             folder_span_click = folder_span;
 83 
 84             //目录树点击
 85             folder_span_click.each(function(index, value) {
 86                 _this = $(this);
 87                 _this.click(function() {
 88                     if(_this.siblings('ul').children().length == 0) { //当前点击的span没有子元素
 89                         var treeParam = {}; //目录树请求对象---这是构建目录树的核心
 90                         treeParam.folderId = _this.attr('data-folderId');
 91                         //执行请求
 92                         $.ajax({
 93                             type: "get", //post,get
 94                             url: "", //请求地址
 95                             data: 'treeParam', //请求数据
 96                             async: true, //true同步,false异步
 97                             success: function(res) {
 98                                 //请求成功执行函数
 99                             }
100                         });
101                         //其他span的变化
102                         $('.folder span').css('color', '#000');
103                         _this.css('color', '#15a4fa');
104                         _this.parent().parent().siblings('ul').find('ul').hide();
105                     } else { //当前点击的span拥有子元素
106                         if(_this.siblings('ul').is(':hidden')) {
107                             _this.parent().parent().siblings('ul').find('ul').hide(); //隐藏其他目录
108                             var ned = _this.parent().parent().siblings().children('li');
109                             _this.parent().parent().siblings('ul').find('span').siblings('ul').siblings('span').css('background', 'url(src/assets/img/right_15a4fa_12px.png) no-repeat left center');
110                             $.each(ned, function(value, index) {
111                                 if(_this.children().length > 1) {
112                                     _this.children('span').css('background', 'url(src/assets/img/right_15a4fa_12px.png) no-repeat left center');
113                                 }
114                             });
115                             _this.siblings('ul').css('display', 'block');
116                             _this.css('background', 'url(src/assets/img/down_15a4fa_12px.png) no-repeat left center');
117                         } else {
118                             _this.siblings('ul').css('display', 'none');
119                             $(this).css('background', 'url(src/assets/img/right_15a4fa_12px.png) no-repeat left center');
120                         }
121                     }
122                 })
123             })
124         }
125     })
126 }

第四步：效果