2017-05-08 67 views
1

我有3个下拉菜单(其中一个是填充城市,一个是机构,另一个是服务)。如果我选择一个城市,第二个下拉列表应该加载数据(代理),如果我选择一个代理商,则第3个下拉列表应加载数据(服务)。我能够填充第一个下拉列表(城市),但我不知道如何填充第二个和第三个。动态下拉使用百里香,春季启动

我应该为每个下拉菜单写一个控制器并返回值吗?如果答案是肯定的,我该如何返回该值? 我读过Thymeleaf不是组件技术,而是像JSP这样的模板技术。因此,在Thymeleaf中没有组件或内置机制来进行客户端 - 服务器通信。 所以我需要使用普通的旧HTML表单或使用AJAX调用来编程通信。 我如何使用普通的旧式HTML对其进行编程?

我尝试过使用表单,但是我点击只提交一次,这不是我所需要的。 我阅读了关于下拉菜单的帖子,但找不到任何有用的信息。我看到了简单的方法是使用jQuery,但我不知道jQuery。 有没有办法只用百里香和春季靴子呢? 谢谢! 我会在下面发布我的代码。

appointment.html

<form th:action="@{/appointment/create}" method="post" id="appointmentForm"> 
      <input type="hidden" name="id" th:value="${appointment.id}"/> 
<div class="form-group"> 
       <label for="location">Alege orasul:</label> 
       <select class="form-control" required="required" 
th:value="${appointment.location}" name="location" id="location"> 
        <option disabled="disabled" selected="selected" > -- 
alege orasul --</option> 
        <option th:each="city : ${cities}" th:value="${city.id}" 
th:text="${city.name}" ></option> 
      </select> 
      </div> 
      </form> 

      <form th:action="@{/appointment/agency}" method="post" id="appointmentForm"> 
      <input type="hidden" name="id" th:value="${appointment.id}"/> 
      <div class="form-group"> 
       <label for="location">Alege agentia:</label> 
       <select class="form-control" th:value="${appointment.agency}" name="agency" id="agency" required="required"> 
        <option disabled="disabled" selected="selected" > -- alege agentia --</option> 
        <option th:each="agency : ${agencies}" th:value="${agency.id}" th:text="${agency.name}" ></option> 

       </select> 
      </div> 
      </form> 
      <form th:action="@{/appointment/service}" method="post" id="appointmentForm"> 
      <input type="hidden" name="id" th:value="${appointment.id}"/> 
      <div class="form-group"> 
       <label for="location">Alege serviciul:</label> 
       <select class="form-control" th:value="${appointment.service}" name="service" id="service" required="required"> 
        <option disabled="disabled" selected="selected" > -- alege serviciul --</option> 
        <option th:each="service : ${services}" th:value="${service.id}" th:text="${service.name}" ></option> 

       </select> 
      </div> 
      </form> 

AppController.java

@Controller 
@RequestMapping("/appointment") 
public class AppointmentController { 

@Autowired 
UserService userService;  
AppointmentService appointmentService; 
CityService cityService; 
AgencyService agencyService; 
SerService serService; 
private ModelAndView mav; 

@RequestMapping(value="/create", method=RequestMethod.GET) 
public String createAppointmentPost(Model model, @ModelAttribute("city") City 
city, @ModelAttribute("agency") Agency agency){ 


    Appointment appointment=new Appointment(); 
    model.addAttribute("appointment", appointment); 
    model.addAttribute("dateString", ""); 
    model.addAttribute("cities", cityService.findAll()); 
    //getAllAgencies(model, city); 
    getAllServices(model,agency); 
    return "appointment"; 
} 

@RequestMapping(value="/agency", method=RequestMethod.GET) 
public String getAllAgencies(Model model, @ModelAttribute("city") City city){ 
    model.addAttribute("agencies", agencyService.listAllAgencies(city)); 
    return "redirect:/appointment/create"; 
} 
public void getAllServices(Model model, @ModelAttribute("agency") Agency 
agency){ 
    if(agency==null){ 
     return; 
    } 
    model.addAttribute("services", serService.listAllServices(agency)); 

} 

回答

1

所以我能解决这个使用jQuery。

这里是一个有用的链接:http://www.rockhoppertech.com/blog/spring-mvc-3-cascading-selects-using-jquery/ 下面我会后我的代码,也许会帮助别人

-mycontroller

@RequestMapping(value="/create", method=RequestMethod.GET) 
public String createAppointmentPost(Model model, @ModelAttribute("city") City 
city, 
     @ModelAttribute("agency") Agency agency){ 

    Appointment appointment=new Appointment(); 
    model.addAttribute("appointment", appointment); 
    model.addAttribute("dateString", ""); 
    model.addAttribute("cities", cityService.findAll()); 
    return "appointment"; 
}  

@RequestMapping(value = "/agencies", method = RequestMethod.GET) 
public @ResponseBody 
List<Agency> findAllAgencies(
     @RequestParam(value = "cityId", required = true) Long cityId) { 
    City city = cityService.findCity(cityId); 
    return agencyService.listAllAgencies(city); 
} 

-thymeleaf

<div class="form-group"> 
    <label for="location">Alege orasul:</label> 
    <select class="form-control" required="required" 
     th:value="${appointment.location}" name="location" id="location"> 
     <option disabled="disabled" selected="selected" > -- 
     alege orasul -- 
     </option> 
     <option th:each="city : ${cities}" th:value="${city.id}" 
     th:text="${city.name}" > 
     </option> 
    </select> 
</div> 

<div class="form-group"> 
     <label for="location">Alege agentia:</label> 
       <select class="form-control" th:value="${appointment.agency}" 
       name="agency" id="agency" required="required"> 
        <option disabled="disabled" selected="selected" > --alege 
        agentia --</option> 
       </select> 
</div> 

jQuery-一个下拉列表

$('#location').change(
     function() { 
      $.getJSON("http://localhost:8181/appointment/agencies", { 
       cityId : $(this).val(), 
       ajax : 'true' 
      }, function(data) { 
       var html = '<option value="">--alege agentia--</option>'; 
       var len = data.length; 
       for (var i = 0; i < len; i++) { 
        html += '<option value="' + data[i].nume + '">' 
          + data[i].nume + '</option>'; 
       } 
       html += '</option>'; 
       $('#agency').html(html); 
      }); 
     });