请你能帮帮我吗？我编写了一个cron监控应用程序，我使用Spring-mvc，Spring-data和thymeleaf。在html页面中，当我选择应用程序名称并单击“bRechercher”（搜索）按钮时，应用程序重新加载页面并且应用程序名称未保持选中状态，而是选择“Sélectionner”。请，我希望在页面重新加载后应用程序名称保持选中状态。有我的html页面，我的控制器和我的事件实体：
<!DOCTYPE html>
<html lang="fr"
xmlns="http://www.w3.org/1999/xhtml"
xmlns:th="http://www.thymeleaf.org"
xmlns:layout="http://www.ultraq.net.nz/thymeleaf/layout"
layout:decorator ="layouts/layout">
<head>
<!-- jQuery -->
<script src="/resources/components/jquery/jquery.min.js"></script>
<!-- Bootstrap Core JavaScript -->
<script src="/resources/components/bootstrap/js/bootstrap.min.js"></script>
<script src="/resources/js/appSuiviCrons.js"></script>
<script>
$(document).ready(function(){
var date_input=$('input[name="startDateEvent"]'); //our date input has the name "date"
var container=$('.bootstrap-iso form').length>0 ? $('.bootstrap-iso form').parent() : "body";
date_input.datepicker({
format: 'mm/dd/yyyy',
container: container,
todayHighlight: true,
autoclose: true,
})
})
</script>
<script>
$(document).ready(function(){
var date_input=$('input[name="endDateEvent"]'); //our date input has the name "date"
var container=$('.bootstrap-iso form').length>0 ? $('.bootstrap-iso form').parent() : "body";
date_input.datepicker({
format: 'mm/dd/yyyy',
container: container,
todayHighlight: true,
autoclose: true,
})
})
</script>
<title th:text="#{sider.suivi.cron}"></title>
</head>
<body>
<div layout:fragment="content" id="page-wrapper">
<div class="container-fluid">
<div class="row">
<div class="col-lg-12">
<h1 class="page-header" th:text="#{sider.suivi.cron}"></h1>
</div>
</div>
<div class="row">
<div class="col-lg-12">
<form name="crons" action="#" th:action="@{/suiviCrons}" method="get">
<table>
<tbody>
<tr>
<td>Rechercher par :</td><td></td><td></td><td></td>
</tr>
<tr>
<td>Nom de l'application : </td>
<td>
<select class = "btn dropdown-toggle" th:value="${applicationName}" name="applicationName" th:field="*{lApplication}">
<option value="" selected="selected">Sélectionner</option>
<option th:each="event : ${lApplication}" th:value="${event}" th:text="${event}"></option>
</select>
</td>
<td>Nom du cron : </td>
<td>
<select th:value="${cronName}" class = "btn dropdown-toggle" name="cronName">
<option th:value="${cronName}"><p th:text="${cronName}"></p></option>
<option th:value="Sélectionner"><p th:text="Sélectionner"></p></option>
<option th:each="event : ${lCrons}" th:value="${event}"><p th:text="${event}"></p></option>
</select>
</td>
</tr>
<tr>
<td>Nom du serveur : </td>
<td>
<select th:value="${serverName}" class = "btn dropdown-toggle" name="serverName">
<option th:value="${serverName}"><p th:text="${serverName}"></p></option>
<option th:value="Sélectionner"><p th:text="Sélectionner"></p></option>
<option th:each="event : ${lServerNames}" th:value="${event}"><p th:text="${event}"></p></option>
</select>
</td>
<td>Adresse IP du serveur : </td>
<td>
<select th:value="${serverIP}" class = "btn dropdown-toggle" name="serverIP">
<option th:value="${serverIP}"><p th:text="${serverIP}"></p></option>
<option th:value="Sélectionner"><p th:text="Sélectionner"></p></option>
<option th:each="event : ${lServerIPs}" th:value="${event}"><p th:text="${event}"></p></option>
</select>
</td>
</tr>
<tr>
<td>Date de début : </td><td></td><td></td><td></td>
</tr>
<tr>
<td>De : </td>
<td>
<input class="form-control" name="startDateEvent" th:value="${startDateEvent}" type="text"/>
</td>
<td>A : </td>
<td>
<input class="form-control" name="endDateEvent" th:value="${endDateEvent}" type="text"/>
</td>
</tr>
<tr>
<td>Statut : </td>
<td>
<select th:value="${status}" class = "btn dropdown-toggle" name="status">
<option th:value="${status}"><p th:text="${status}"></p></option>
<option th:value="Sélectionner"><p th:text="Sélectionner"></p></option>
<option th:each="statut : ${lStatut}" th:value="${statut.label}"><p th:text="${statut.label}"></p></option>
</select>
</td>
<td></td>
<td></td>
</tr>
</tbody>
</table>
<br/><button class = "fa fa-search btn btn-success" th:value="Rechercher" name="bRechercher"> Rechercher</button></br></br></br>
<table class="table table-bordered" border="1">
<tbody>
<tr>
<th>Nom du cron</th>
<th>Serveur/Adresse IP</th>
<th>Application</th>
<th>Date de début</th>
<th>Date de fin</th>
<th>Statut</th>
</tr>
<tr th:each="event : ${lEvents}">
<td><p th:text="${event.cron.nom}"></p></td>
<td><p th:text="${event.cron.application.serveur.nom}"></p>/<p th:text="${event.cron.application.serveur.adresseIP}"></p></td>
<td><p th:text="${event.cron.application.nom}"></p></td>
<td th:text="${event.dateDebut}"></td>
<td th:text="${event.dateFin}"></td>
<td th:if="${event.statut == null}"><p th:text="${event.statut}"></p></td>
<td th:if="${event.statut != null}"><p th:text="${event.statut.label}"></p></td>
</tr>
</tbody>
</table><br/></br>
<center>
<div th:if="${lEvents.totalPages != 1}" class="form-group col-md-11 pagination-centered" style="cen">
<ul class="pagination">
<li th:class="${lEvents.number == 0} ? disabled">
<a class="pageLink" th:href="@{/suiviCrons(pageSize=${selectedPageSize}, page=1, bRechercher='Rechercher', applicationName=${applicationName}, cronName=${cronName}, serverName=${serverName}, serverIP=${serverIP}, startDateEvent=${startDateEvent}, endDateEvent=${endDateEvent}, status=${status})}">«</a>
</li>
<li th:class="${lEvents.number == 0} ? disabled">
<a class="pageLink" th:href="@{/suiviCrons(pageSize=${selectedPageSize}, page=${lEvents.number}, bRechercher='Rechercher', applicationName=${applicationName}, cronName=${cronName}, serverName=${serverName}, serverIP=${serverIP}, startDateEvent=${startDateEvent}, endDateEvent=${endDateEvent}, status=${status})}">←</a>
</li>
<li th:class="${lEvents.number == (page - 1)} ? 'active pointer-disabled'"
th:each="page : ${#numbers.sequence(pager.startPage, pager.endPage)}">
<a class="pageLink" th:href="@{/suiviCrons(pageSize=${selectedPageSize}, page=${page}, bRechercher='Rechercher', applicationName=${applicationName}, cronName=${cronName}, serverName=${serverName}, serverIP=${serverIP}, startDateEvent=${startDateEvent}, endDateEvent=${endDateEvent}, status=${status})}" th:text="${page}"></a>
</li>
<li th:class="${lEvents.number + 1 == lEvents.totalPages} ? disabled">
<a class="pageLink" th:href="@{/suiviCrons(pageSize=${selectedPageSize}, page=${lEvents.number + 2}, bRechercher='Rechercher', applicationName=${applicationName}, cronName=${cronName}, serverName=${serverName}, serverIP=${serverIP}, startDateEvent=${startDateEvent}, endDateEvent=${endDateEvent}, status=${status})}">→</a>
</li>
<li th:class="${lEvents.number + 1 == lEvents.totalPages} ? disabled">
<a class="pageLink" th:href="@{/suiviCrons(pageSize=${selectedPageSize}, page=${lEvents.totalPages}, bRechercher='Rechercher', applicationName=${applicationName}, cronName=${cronName}, serverName=${serverName}, serverIP=${serverIP}, startDateEvent=${startDateEvent}, endDateEvent=${endDateEvent}, status=${status})}">»</a>
</li>
<li style="padding-left: 18px">
<select class = "btn dropdown-toggle" id="pageSizeSelect">
<option th:each="pageSize : ${pageSizes}" th:text="${pageSize}" th:value="${pageSize}" th:selected="${pageSize} == ${selectedPageSize}"></option>
</select>
</li>
</ul>
</div>
</center>
</form>
</div>
</div>
</div>
</div>
</body>
</html>
控制器：
package com.leyton.cacron.frontend.controller;
import com.leyton.cacron.backend.bo.Application;
import com.leyton.cacron.backend.bo.Cron;
import com.leyton.cacron.backend.bo.Event;
import com.leyton.cacron.backend.repository.jpa.ApplicationRepo;
import com.leyton.cacron.backend.repository.jpa.CronRepo;
import com.leyton.cacron.backend.repository.jpa.CronRepoCustom;
import com.leyton.cacron.backend.repository.jpa.EventRepoCustom;
import com.leyton.cacron.backend.service.CronService;
import com.leyton.cacron.backend.service.EventService;
import com.leyton.cacron.backend.util.Pager;
import com.leyton.cacron.backend.util.Statut;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.PageRequest;
import org.springframework.data.domain.Sort;
import org.springframework.stereotype.Controller;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;
import java.util.ArrayList;
import java.util.List;
import java.util.Optional;
import static com.leyton.cacron.frontend.util.WebPaths.SUIVCRONS;
@Controller
@RequestMapping(SUIVCRONS)
public class SuiviCronController {
private static final int BUTTONS_TO_SHOW = 5;
private static final int INITIAL_PAGE = 0;
private static final int INITIAL_PAGE_SIZE = 5;
private static final int[] PAGE_SIZES = { 5, 10, 20 };
@Autowired
private CronService cronService;
@Autowired
private EventService eventService;
@Autowired
private ApplicationRepo applicationRepo;
@Autowired
private EventRepoCustom eventRepoCustom;
@Autowired
private CronRepo cronRepo;
public SuiviCronController(CronService cronService) {
this.cronService = cronService;
}
@RequestMapping(method = RequestMethod.GET)
public String findAllUsers(ModelMap model, HttpServletRequest request, HttpSession session, @RequestParam("pageSize") Optional<Integer> pageSize,
@RequestParam("page") Optional<Integer> page) {
try {
String bRechercher = request.getParameter("bRechercher");
if(bRechercher == null) {
String applicationName = request.getParameter("applicationName") == null? "":request.getParameter("applicationName");
String cronName = request.getParameter("cronName") == null? "":request.getParameter("cronName");
String serverName = request.getParameter("serverName") == null? "":request.getParameter("serverName");
String serverIP = request.getParameter("serverIP") == null? "":request.getParameter("serverIP");
String startDateCron = request.getParameter("startDateCron") == null? "":request.getParameter("startDateCron");
String endDateCron = request.getParameter("endDateCron") == null? "":request.getParameter("endDateCron");
String status = request.getParameter("status") == null? "":request.getParameter("status");
// Evaluate page size. If requested parameter is null, return initial
// page size
int evalPageSize = pageSize.orElse(INITIAL_PAGE_SIZE);
//int evalPageSize = Integer.parseInt(request.getParameter("listPageSizes"));
// Evaluate page. If requested parameter is null or less than 0 (to
// prevent exception), return initial size. Otherwise, return value of
// param. decreased by 1.
int evalPage = (page.orElse(0) < 1) ? INITIAL_PAGE : page.get() - 1;
Page<Event> lEvents = eventService.findAllPageable(new PageRequest(evalPage, evalPageSize, new Sort(new Sort.Order(Sort.Direction.DESC, "dateDebut"))));
List<Event> lEventsAll = eventService.findAll();
//List<Cron> lCronAccueil = crons.getContent();
// Date d1 = null;
// for(Cron c4 : crons){
// d1 = c4.getHeure();
// d1.setHours(d1.getHours()-1);
// c4.setHeure(d1);
// }
Pager pager = new Pager(lEvents.getTotalPages(), lEvents.getNumber(), BUTTONS_TO_SHOW);
List<Statut> lStatut = new ArrayList<>();
lStatut.add(Statut.SANS_ERREUR);
lStatut.add(Statut.AVEC_ERREUR);
lStatut.add(Statut.DELAI_DEPASSE);
lStatut.add(Statut.EXECUTION_INCOMPLETE);
lStatut.add(Statut.NON_EXECUTE);
List<Event> lApplication = eventRepoCustom.findEventByApplicationDistinct();
List<Event> lCrons = eventRepoCustom.findEventByCronNameDistinct();
List<Event> lServerNames = eventRepoCustom.findEventByServerNameDistinct();
List<Event> lServerIPs = eventRepoCustom.findEventByServerIPDistinct();
model.addAttribute("lastSelected", applicationName);
model.addAttribute("lApplication", lApplication);
model.addAttribute("lCrons", lCrons);
model.addAttribute("lServerNames", lServerNames);
model.addAttribute("lServerIPs", lServerIPs);
//model.addAttribute("applicationName", "Sélectionner");
model.addAttribute("cronName", "Sélectionner");
model.addAttribute("serverName", "Sélectionner");
model.addAttribute("serverIP", "Sélectionner");
model.addAttribute("status", "Sélectionner");
model.addAttribute("lEvents", lEvents);
model.addAttribute("lEventsAll", lEventsAll);
model.addAttribute("lStatut", lStatut);
model.addAttribute("selectedPageSize", evalPageSize);
model.addAttribute("pageSizes", PAGE_SIZES);
model.addAttribute("pager", pager);
}
else{
String applicationName = request.getParameter("applicationName") == null? "":request.getParameter("applicationName");
String cronName = request.getParameter("cronName") == null? "":request.getParameter("cronName");
String serverName = request.getParameter("serverName") == null? "":request.getParameter("serverName");
String serverIP = request.getParameter("serverIP") == null? "":request.getParameter("serverIP");
String startDateEvent = request.getParameter("startDateEvent") == null? "":request.getParameter("startDateEvent");
String endDateEvent = request.getParameter("endDateEvent") == null? "":request.getParameter("endDateEvent");
String status = request.getParameter("status") == null? "":request.getParameter("status");
Statut statut = null;
if(Statut.AVEC_ERREUR.getLabel().equals(status))
statut = Statut.AVEC_ERREUR;
else if(Statut.DELAI_DEPASSE.getLabel().equals(status))
statut = Statut.DELAI_DEPASSE;
else if(Statut.NON_EXECUTE.getLabel().equals(status))
statut = Statut.NON_EXECUTE;
else if(Statut.EXECUTION_INCOMPLETE.getLabel().equals(status))
statut = Statut.EXECUTION_INCOMPLETE;
else if(Statut.SANS_ERREUR.getLabel().equals(status))
statut = Statut.SANS_ERREUR;
int evalPageSize = pageSize.orElse(INITIAL_PAGE_SIZE);
int evalPage = (page.orElse(0) < 1) ? INITIAL_PAGE : page.get() - 1;
Page<Event> lEvents = eventRepoCustom.findCronBySrchFilterCriteria(applicationName, cronName, serverName, serverIP, startDateEvent, endDateEvent, statut, new PageRequest(evalPage, evalPageSize));
Pager pager = new Pager(lEvents.getTotalPages(), lEvents.getNumber(), BUTTONS_TO_SHOW);
List<Statut> lStatut = new ArrayList<>();
lStatut.add(Statut.SANS_ERREUR);
lStatut.add(Statut.AVEC_ERREUR);
lStatut.add(Statut.DELAI_DEPASSE);
lStatut.add(Statut.EXECUTION_INCOMPLETE);
lStatut.add(Statut.NON_EXECUTE);
List<Event> lEventsAll = eventService.findAll();
List<Event> lApplication = eventRepoCustom.findEventByApplicationDistinct();
List<Event> lCrons = eventRepoCustom.findEventByCronNameDistinct();
List<Event> lServerNames = eventRepoCustom.findEventByServerNameDistinct();
List<Event> lServerIPs = eventRepoCustom.findEventByServerIPDistinct();
model.addAttribute("lastSelected", applicationName);
model.addAttribute("lApplication", lApplication);
model.addAttribute("lCrons", lCrons);
model.addAttribute("lServerNames", lServerNames);
model.addAttribute("lServerIPs", lServerIPs);
model.addAttribute("applicationName", applicationName);
model.addAttribute("cronName", cronName);
model.addAttribute("serverName", serverName);
model.addAttribute("serverIP", serverIP);
model.addAttribute("status", status);
model.addAttribute("lEvents", lEvents);
model.addAttribute("lEventsAll", lEventsAll);
model.addAttribute("lStatut", lStatut);
model.addAttribute("startDateEvent", startDateEvent);
model.addAttribute("endDateEvent", endDateEvent);
model.addAttribute("selectedPageSize", evalPageSize);
model.addAttribute("pageSizes", PAGE_SIZES);
model.addAttribute("pager", pager);
}
}
catch (Exception e) {
e.printStackTrace();
}
return "suiviCrons";
}
}
事件实体：
@Entity
public class Event implements Serializable {
private static final long serialVersionUID = 1L;
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private Long id;
private Date dateDebut;
private Date dateFin;
private long dureeExecution;
@Enumerated
private Statut statut;
@ManyToOne(cascade = CascadeType.ALL)
@JoinColumn(name = "cron_id")
private Cron cron;
public Event() {
}
public Event(Cron cron) {
this.cron = cron;
}
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public Date getDateDebut() {
return dateDebut;
}
public void setDateDebut(Date dateDebut) {
this.dateDebut = dateDebut;
}
public Date getDateFin() {
return dateFin;
}
public void setDateFin(Date dateFin) {
this.dateFin = dateFin;
}
public long getDureeExecution() {
return dureeExecution;
}
public void setDureeExecution(long dureeExecution) {
this.dureeExecution = dureeExecution;
}
public Cron getCron() {
return cron;
}
public void setCron(Cron cron) {
this.cron = cron;
}
public Statut getStatut() {
return statut;
}
public void setStatut(Statut statut) {
this.statut = statut;
}
}
答案 0 :(得分：1)
尝试用以下内容替换您的选择：
<select class = "btn dropdown-toggle" th:value="${applicationName}" name="applicationName" th:field="*{lApplication}">
<option value="" selected="selected">Sélectionner</option>
<option th:each="event : ${lApplication}" th:value="${event}" th:text="${event}" th:selected="${event} == ${lastSelected}"></option>
</select>
另外，您可以查看此thymeleaf forum