如下所示：

<select id="cc" name="rempId" data-options="required:true"></select>

<script>

$(function(){
$.ajax({
url:"departmentAction_getAllDep.action",
type:"post",
success:function(result){
//console.log(result);
$("#cc").combotree("loadData",b1(result));
}
});
$("#cc").combotree({
animate:true,
//選擇樹節(jié)點觸發(fā)事件 
 onSelect : function(node) { 
 n = node;
  //返回樹對象 
  var tree = $(this).tree; 
  //選中的節(jié)點是否為葉子節(jié)點,如果不是葉子節(jié)點,清除選中 
  var isLeaf = tree("isLeaf", node.target); 
  if (!isLeaf) { 
   //清除選中 
   $("#cc").combotree("clear"); 
  } 
 } 
});
});

var tree = {
id:"", 
 text:"", 
 state:"", 
 checked:"", 
 iconCls:"",
 attributes:"", 
 children:""
}

function b1(result){
var t = [];
$.each(result,function(index,dept){
t[index] = b2(dept);
});
return t;
}

function b2(dept){
  var tree = new Object();
tree.id = dept.depId; 
 tree.text = dept.depName; 
 tree.state = "closed"; 
 tree.checked = "false";
 if(dept.employees.length != 0){
 tree.children = b3(dept.employees);
 }else{
 tree.children = [];
 }
 return tree;
}

function b3(employees){ 
 var easyTree = []; 
 $.each(employees,function(index,item){ 
 easyTree[index] = b4(item); 
 }); 
 return easyTree; 
} 
 
function b4(item){
var tree = new Object();
tree.id = item.empId;
tree.text = item.empName;
if(item.empSex == "男"){
tree.iconCls = "icon-nan";
}else{
tree.iconCls = "icon-female";
}
return tree;
} 

</script>

department表中的dept_id作為employee表中有的外鍵，生成的Department.java類中有Set<employee>對象。從后臺查詢部門表，得到List<Department>集合，通過struts2配置：

<action name="departmentAction_*" method="{1}">
<result name="getAllDep" type="json">
<param name="root">list</param>
</result>
</action>

轉(zhuǎn)成json格式后，傳到j(luò)sp頁面，在前臺頁面中處理json數(shù)據(jù)，動態(tài)生成下拉樹。

以上這篇ajax請求后臺得到j(luò)son數(shù)據(jù)后動態(tài)生成樹形下拉框的方法就是小編分享給大家的全部內(nèi)容了，希望能給大家一個參考，也希望大家多多支持。