Question

我在Jsp One中有两个下拉列表用于州和其他国家/地区。只要我选择国家/地区，就应该使用相应的列表自动填充州名单。但我得到整个jsp页面作为ajax调用中的响应。我的ajax计划：

$("select#country").change(function() {
var val=$("#country").val();
alert(val);
$.ajax({
url : 'getstates',
method : 'get',
contentType: 'application/json',
 data :{
          country : val
        },

  success: function (data) {
  alert("Success Response"+ data);

  },

   error :function()
   {
           alert("error");
    }          

   });

我的控制器程序

 @RequestMapping(value = "/getstates", method = RequestMethod.GET)
 public ModelAndView  showstates(@RequestParam(required = false, value = "") 
     String country,@Valid    @ModelAttribute("employee")Login employee, 
     BindingResult result, Model model) {  
    HashMap<String,String>  stateMap = new HashMap<String,String>();
     //put your logic to add state on basis of country

     if (country.equals("UnitedStates")) {
         stateMap.put("Al","Alaska");
         stateMap.put("Tl","Texas");

     } else if (country.equals("UnitedKingdom")) {
         stateMap.put("Be","Bedfordshire");
         stateMap.put("Ber","Berkshire");

     } else if (country.equals("India")) {
         stateMap.put("Mh","Maharashtra");
         stateMap.put("WB","West Bengal");
         stateMap.put("KR","Karnataka");
         stateMap.put("AP","Andhra Pradesh");
         stateMap.put("TN","Tamil Nadu");
     } 


     return new ModelAndView("LoginForm","state" ,stateMap);
 }

我正在使用弹簧形式。我只需要将Staemap作为respone，但我将整个jsp页面作为响应。

Answer 1

我只需要将Staemap作为respone但我正在获取整个jsp页面作为回应。

因为您在此处返回ModelAndView对象，

return new ModelAndView("LoginForm","state" ,stateMap);

如果您需要单独从控制器方法返回respone。但是，您无法直接在jsp上的HashMap响应中打印ajax。恕我直言，你可以将其转换为JSONArray

JSONArray jarray = JSONArray.fromObject(statemap);

阅读，

Answer 2

  @RequestMapping(value="LoadBaselineVersions")
        @ResponseBody
        public Map<Integer,String> loadBaseNames(@RequestParam(value="projectname") String name,HttpSession session){

                 return basenameService.getBaselineversions(name);
        }
$("#projectname").bind(
                'blur',
                function() {
                    $.ajax({
                        type : 'post',
                        url : 'LoadBaselineVersions?projectname='
                                + $("#projectname").val(),
                        dataType : 'json',
                        success : function(data) {
                            $("#baseversion").empty();
                            $.each(data, function(val, text) {

                                $("#baseversion").append(
                                        $('<option></option>').val(text).html(
                                                text));

                            });

                        }
                    });
                });

在Springmvc中将Hashmap从控制器返回到JSP

2 个答案: