实例化。这里增加了三个属性，可以指定idFiled，textFiled和parentField。所以这里的simpleData可以不严格转换成tree的数据格式。
$(function(){ $('#tt3').tree({ checkbox: true, url: 'tree_data_simp.php', parentField:"pid", textFiled:"name", idFiled:"key" });}); tree_data_simp.php 的json数据类型。是一个扁平结构数据集。
[ { "key": 1, "name": "Folder1", "iconCls": "icon-ok" }, { "key": 2, "pid": 1, "name": "File1", "checked": true }, { "key": 3, "pid": 1, "name": "Folder2", "state": "open" }, { "key": 4, "pid": 3, "name": "File3", "attributes": { "p1": "value1", "p2": "value2" }, "checked": true, "iconCls": "icon-reload" }, { "key": 8, "pid": 3, "name": "Async Folder" }, { "key": 9, "name": "language", "state": "closed" }, { "key": "j1", "pid": 9, "name": "Java" }, { "key": "j2", "pid": 9, "name": "C#" }] 自定义loadFilter的实现
$.fn.tree.defaults.loadFilter = function (data, parent) { var opt = $(this).data().tree.options; var idFiled, textFiled, parentField; if (opt.parentField) { idFiled = opt.idFiled || 'id'; textFiled = opt.textFiled || 'text'; parentField = opt.parentField; var i, l, treeData = [], tmpMap = []; for (i = 0, l = data.length; i < l; i++) { tmpMap[data[i][idFiled]] = data[i]; } for (i = 0, l = data.length; i < l; i++) { if (tmpMap[data[i][parentField]] && data[i][idFiled] != data[i][parentField]) { if (!tmpMap[data[i][parentField]]['children']) tmpMap[data[i][parentField]]['children'] = []; data[i]['text'] = data[i][textFiled]; tmpMap[data[i][parentField]]['children'].push(data[i]); } else { data[i]['text'] = data[i][textFiled]; treeData.push(data[i]); } } return treeData; } return data;};
延伸使用，对于easyui的数据节点，想要根据层级显示不同的icon
function getLevel(node, level){ var children = node.children; if(level == 0) node.iconCls = "icon-add"; else if( level == 1) node.iconCls = "icon-remove"; else if ( level == 2) node.iconCls = "icon-save"; if(children) for( var i = 0; i < children.length; i++){ getLevel(children[i], level+1); } }