使用 thymeleaf、spring boot 的动态下拉菜单
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【中文标题】使用 thymeleaf、spring boot 的动态下拉菜单【英文标题】:Dynamic dropdowns using thymeleaf, spring boot 【发布时间】:2017-10-06 11:55:37 【问题描述】:我有 3 个下拉菜单(一个是城市,一个是代理,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,第三个下拉应该加载数据(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。
我应该为每个下拉菜单编写一个控制器并返回值吗?如果答案是肯定的,我该如何返回值? 我读过 Thymeleaf 不是组件技术,而是像 JSP 这样的模板技术。因此,Thymeleaf 中没有组件或内置机制来进行客户端-服务器通信。 因此,我需要使用普通的旧 html 表单或使用 AJAX 调用来对通信进行编程。 如何使用普通的旧 HTML 对其进行编程?
我尝试使用表单,但我只单击一次提交,这不是我需要的。 我阅读了有关下拉菜单的帖子,但找不到任何有用的信息。我看到最简单的方法是使用 jQuery,但我不知道 jQuery。 有没有办法只使用百里香和弹簧靴来做到这一点? 谢谢! 我将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));
【问题讨论】:
【参考方案1】:所以我能够使用 jQuery 解决这个问题。
这是一个有用的链接:http://www.rockhoppertech.com/blog/spring-mvc-3-cascading-selects-using-jquery/ 我将在下面发布我的代码,也许会对某人有所帮助
-我的控制器
@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);
-百里香
<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- 一个下拉菜单
$('#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);
);
);
【讨论】:
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