jQuery，JSON，Spring MVC-动态加载选择选项 [英] JQuery, JSON, Spring MVC - Dynamically loading select options

问题描述

我有一个像这样的jsp表格...第二个选择框中的值，应根据第一个选择框中的值(国家/地区)加载状态.我正在使用AJAX，JSON，Spring MVC来检索结果.

I have a jsp form like this... Values in the second select box, state should be loaded based on value in first select box (country),. I am using AJAX, JSON, Spring MVC to retrieve results.

index.jsp .....

index.jsp.....

<form:form name="myform" modelAttribute="search" action="POST">
    <form:input path="firstName" class="text" />
    <form:input path="lastName" class="text" />
    <form:select path="country" id="country">
         <form:option value="" label="--Choose A Value--"></form:option>
         <form:options items="${countryList}" itemValue="id"   itemLabel="name"></form:options>
     </form:select>
        <form:select path="state" onchange="javascript:itemFocus('submit');" id="state">
          <form:option value="" label="--Choose A Value--"></form:option>
          <form:options items="${stateList}" itemValue="id" itemLabel="description"></form:options>
     </form:select>
     <form:checkboxes items="${skillsList}" path="skills" itemLabel="description" itemValue="id" delimiter="<br>" />
      <form:checkboxes items="${languagesList}" path="languages" itemLabel="description" itemValue="id" delimiter="<br>" />

    </form:form>

控制器....

   @RequestMapping(value="stateslist.html")
   public @ResponseBody List<State> sectionList(@ModelAttribute("search") SearchForm search, @RequestParam(value="countryId", required=true) String countryId, ModelMap modelMap){
    return stateService.getStates(countryId);
   }

jQuery部分....

JQuery part....

   <script type="text/javascript" charset="utf-8">
     function getStates(){
        $.getJSON(
             "stateslist.html", 
             {countryId: $('#country').val()},
             function(data) {
                  var html = '';
                  var len = data.length;
                  for(var i=0; i<len; i++){
                       html += '<option value="' + data[i].id + '">' + data[i].name + '</option>';
                   }
                  $('#state').append(html);
             }
          );
 }

      $(document).ready(function() {
         $('#country').change(function()
          {   getStates();
          });
      });
</script>

我可以从调试器中看到，ajax请求正被提交到Spring控制器，并且它确实返回了State对象的列表，其中包含诸如id，name等字段.问题是状态选择选项是没变..似乎是function(data){....}部分无法正常工作..有人可以帮助我在这里做错的地方吗...

I can see form the debugger that the ajax request is getting submitted to the the Spring controller and it does returns a list of State objects, which contains fields like id, name etc... Problem is that the state select options are not changing.. seems to be that function(data){....} part is not working..can someone help me where I am doing wrong here...

---更新---

我已经从回调函数中删除了所有内容，然后才有了..

I have removed everything from the callback function and just had thi..

function(data){alert("something");}

即使这样也不起作用...这意味着呼叫从未到达该部分...

even this didn't work... that mean call never reached that part...

推荐答案

我有相同的代码，其中城市(cityId)的值根据国家(countryId)的选择而改变.效果完美:

I have the same code where city (cityId) values are changed according to country (countryId) selection. It works perfect:

$("select#countryId").change(function(){
         $.getJSON("getCityList.do",{countryCode: $(this).val()}, function(j){
              var options = '';
              for (var i = 0; i < j.length; i++) {
                options += '<option value="' + j[i].id + '">' + j[i].name + '</option>';
              }
              $("select#cityId").html(options);
            });
        });

所以我认为您只需要添加选择"前缀即可.

So I think you just need to add "select" prefix.

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