选择控制器选项后，将数据提供给控制器的第二选择

Question

这只是一个例子：

    <script>
    $('#mainCat').on('change', function() {
        var selected = $(this).val();
        $("#expertCat option").each(function(item){
            console.log(selected) ;  
            var element =  $(this) ; 
            console.log(element.data("tag")) ; 
            if (element.data("tag") != selected){
                element.hide() ; 
            }else{
                element.show();
            }
        }) ; 

        $("#expertCat").val($("#expertCat option:visible:first").val());

});
</script>
<select id="mainCat">
            <option value = '1'>navid</option>
            <option value = '2'>javad</option>
            <option value = '3'>mamal</option>
        </select>

        <select id="expertCat">
            <option  value = '1' data-tag='2'>UI</option>
            <option  value = '2' data-tag='2'>Java Android</option>
            <option  value = '3' data-tag='1'>Web</option>
            <option  value = '3' data-tag='1'>Server</option>
            <option  value = '3' data-tag='3'>Back End</option>
            <option  value = '3' data-tag='3'>.net</option>
        </select>

我的控制器我想首先选择两个部门，然后选择部门中的职位。我有两种方法，可以返回部门列表和部门位置列表。当我在第一次选择中选择值并在选择两个中返回时，需要帮助如何提供参数。

    @GET
    @Secured(value = { "ROLE_ADMIN" })
    @RequestMapping(value = "/addUser")
    public String userForm(User user, Model model,
    @RequestParam(name="success", required=false)String success
    /*@RequestParam(name="department") int departmentId*/) {
    Map<Integer, String> positionMapById = preparePositionMap(departmentId);
    Map<Integer, String> departmentMap = prepareDepartmentMap();
    model.addAttribute("departmentMap", departmentMap);
    model.addAttribute("positionMapById", positionMapById);
    model.addAttribute("user", user);
    if(success != null) {
    if(success.equals("addUser")) {
    model.addAttribute("message", "Użytkownik dodany !");
    }
    }
    return "addUser";
    }

JSP：

    <div class="form-group">
    <label>Wybierz Dział</label>
    <%--  <form:select id="inputState" class="form-control" path="department" 
    items="${departmentMap}"/>--%>
    <form:select id="inputState" class="form-control"  path="department" 
    onchange="this.id">
    <form:option value="${position.id}"> --SELECT--</form:option>
    <form:options items="${departmentMap}"></form:options>

    </form:select>
    </div>
    <br />
    <div class="form-group">


    <label>Wybierz stanowisko</label>


     <form:select id="inputState" class="form-control" path="position" 
    items="${positionMapById}" />
    </div>