json 的使用 关于多级下拉菜单的选择代码

1.dwr中的action
public String getInsByAppCode(String appCode) throws Exception{

JSONArray obj ;

if (appCode != null && !"".equals(appCode) && !"null".equalsIgnoreCase(appCode)) {

//String xmlCode = fsAppvtreeDefService.getAppCodeById(appCode);

boolean isIns = false;//appTypeService.isInsurancecode(xmlCode);

if (!isIns) {

obj= this.fsAppvtreeDefService.getAppVtreeJson(appCode);//////// 2.的方法内容

} else {

obj = this.fsAppvtreeDefService.getInsJson(appCode);

}

return obj.toString() + "="+ isIns;

}

return "";

}

2.。getAppVtreeJson(String insCode) 方法内容
public JSONArray getAppVtreeJson(String insCode) throws Exception {

List resultList = getFsAppvtreeDef(insCode);

JSONArray jsonarr = new JSONArray();

JSONObject json = null;

JSONArray jsonnewarr = new JSONArray();
for (int i = 0; i < resultList.size(); i++) {

FsAppvtreeDef fapp = (FsAppvtreeDef) resultList.get(i);

if (fapp.getChildFlag() == 0) {

json = new JSONObject();

fapp = (FsAppvtreeDef) resultList.get(i);

json.put("vtreeCode", fapp.getAppvtreeCode());

json.put("vtreeName", fapp.getNodeName());

json.put("parentCode", fapp.getParentNode());

json.put("xmlCode", fapp.getXmlCode());

jsonarr.put(json);
} else {

jsonnewarr = getAppVtreeJson(fapp.getAppvtreeCode() + "");

for (int j = 0; j < jsonnewarr.length(); j++) {

jsonarr.put(jsonnewarr.get(j));

}

}

}

return jsonarr;

}

3.jsp中的将 下面的东东， //json字符串转化为对象
JSONArray jsonarr = new JSONArray();

JSONObject json = null;

代码如下

//参数传入一个业务类型代码

changeType = function (appCode) {

appCodeTemp = appCode;

appType.getInsByAppCode(appCode,callbackType);

}

callbackType = function (data) {

if (data != null && data != "") {

var objType = null;

var busiValue = null;

var datas = data.split("=");
var insType = document.getElementById("insType");

var length = insType.options.length;

//添加之前将原有的险种元素删除

for (var i = length - 1; i >= 1; i--) {

insType.options.remove(i);

}

//添加之前将原有的产品小类元素删除

var prod = document.getElementById("prod");

var length = prod.options.length;

for (var i = length - 1; i >= 1; i--) {

prod.options.remove(i);

}

var subType = document.getElementById("subType");

var length = subType.options.length;

//添加之前将原有的单证元素删除

for (var i = length - 1; i >= 1; i--) {

subType.options.remove(i);

}

var widgetIdType = document.getElementById("widgetId");

var length = widgetIdType.options.length;

//添加之前将原有的录入字段元素删除

for (var i = length - 1; i >= 1; i--) {

widgetIdType.options.remove(i);

}

if(datas[1] != "false") {

document.getElementById("insTypeDiv").style.display = "inline";

objType = insType;

busiValue = "<%=insType%>";

isInsType = true;

} else {

document.getElementById("insTypeDiv").style.display = "none";

objType = subType;

busiValue = "<%=subType%>";

isInsType = false;

changeProdType(appCodeTemp);

}

//json字符串转化为对象

var myObject = eval("(" + datas[0] + ")");

for (var i = 0; i < myObject.length; i++) {

var nodeCode = myObject[i].vtreeCode;

var nodeName = myObject[i].vtreeName;

var option=new Option(nodeName,nodeCode);

if(nodeCode==busiValue){

option.selected=true;

}

objType.options.add(option);

}

}

}

//选择险种

changeInsType = function (insCode) {

setTimeout('loadMethod('+insCode+')',1);

}

function loadMethod(insCode) {

appType.getAppvtreeByInsCode(insCode, callbackInsuranceType);

appType.getProdByInsCode(insCode, callbackInsType);

}

callbackInsType = function (data) {

if (data != null) {

var prod = document.getElementById("prod");

var length = prod.options.length;

//添加之前将原有的产品小类元素删除

for (var i = length - 1; i >= 1; i--) {

prod.options.remove(i);

}

var prodValue='<%=prod%>';

var myObject = eval("(" + data + ")");

for (var i = 0; i < myObject.length; i++) {

var prodCode = myObject[i].prod;

var prodName = myObject[i].prodName;

var option=new Option(prodName,prodCode);

if(prodValue==prodCode){

option.selected=true;

}

prod.options.add(option);

}

}

}

callbackInsuranceType = function (data) {

if (data != null) {

var subType = document.getElementById("subType");

var length = subType.options.length;

//添加之前将原有的单证元素删除

for (var i = length - 1; i >= 1; i--) {

subType.options.remove(i);

}

//json字符串转化为对象

var myObject = eval("(" + data + ")");

var subValue='<%=subType%>';

for (var i = 0; i < myObject.length; i++) {

var nodeCode = myObject[i].vtreeCode;

var nodeName = myObject[i].vtreeName;

var option=new Option(nodeName,nodeCode);

if(subValue==nodeCode){

option.selected=true;

}

subType.options.add(option);

}

}

}

//选择产品小类加载字段

changeProdType=function(prod){

var insCode=document.getElementById('insType').value;

if(insCode==''||insCode==null){

insCode='<%=insType%>';

}

appType.getWidgetByInsCode(insCode,prod,callbackProdType);

}

callbackProdType=function(data){

if(data!=null){

var widgetIdType = document.getElementById("widgetId");

var length = widgetIdType.options.length;

//添加之前将原有的录入字段元素删除

for (var i = length - 1; i >= 1; i--) {

widgetIdType.options.remove(i);

}

//json字符串转化为对象

var widgetValue='<%=widgetId%>';

var myObject = eval("(" + data + ")");

for (var i = 0; i < myObject.length; i++) {

var nodeCode = myObject[i].vtreeCode;

var nodeName = myObject[i].vtreeName;

var tt=new Option(nodeName,nodeCode);

if(nodeCode==widgetValue){

tt.selected=true;

}

widgetIdType.options.add(tt);

}

}

}