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,
//選擇樹節點觸發事件 
 onSelect : function(node) { 
 n = node;
  //返回樹對象 
  var tree = $(this).tree; 
  //選中的節點是否為葉子節點,如果不是葉子節點,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>

轉成json格式后，傳到jsp頁面，在前臺頁面中處理json數據，動態生成下拉樹。

以上這篇ajax請求后臺得到json數據后動態生成樹形下拉框的方法就是小編分享給大家的全部內容了，希望能給大家一個參考，也希望大家多多支持。