问题描述
两个问题。
- 我有User和Note类。用户可以有很多笔记。如何通过Thymeleaf展示属于用户的每个笔记? th:text =$ {u.notes.id}不起作用
- 我有表格(见图片),每个用户的复选框都有布尔值isUserChecked值,下面是按钮删除已检查的用户Thymeleaf正确显示isUserChecked值的状态。当我手动选中复选框时,删除按钮不起作用,但是当我在代码中设置isUserChecked值时,该按钮有效。问题在于我的Thymeleaf语法中的这个复选框。
屏幕截图:
html
<div class="container">
<div class="row">
<div class="col-sm-6">
<table class="table table-hover">
<thead>
<tr>
<th>Id</th>
<th>Username</th>
<th>First name</th>
<th>Last name</th>
<th>Password (Hash)</th>
<th>Role</th>
<th>Notes</th>
<th>Select</th>
</tr>
</thead>
<tbody>
<tr th:each="u : ${listOfUsers}">
<td th:text="${u.id}"></td>
<td th:text="${u.username}"></td>
<td th:text="${u.firstName}"></td>
<td th:text="${u.lastName}"></td>
<td th:text="${#strings.substring(u.password,0,5) +'...'}"></td>
<td th:text="${u.role}"></td>
<td th:text="${u.notes}"></td>
<td><input type="checkbox" name="mycheckbox"
th:value="*{u.isUserChecked()}" th:checked="${u.isUserChecked()}" /></td>
</tr>
</tbody>
</table>
<form th:action="@{/users}" method="post">
<button class="buttonLogin" type="submit">Submit</button>
</form>
</div>
</div>
更新1
正如@Metroids提到的第一个问题可以解决:
as @Metroids mentioned first problem can fix by:
< td>< span th:each =note,i: $ {u.notes}th:text =$ {(i.index> 0?',':'')+ note.id}/>< / td>
第二个问题。在我的html中使用它:
Second problem. For using this in my html:
<tr th:each="u, i : ${userWrapper}">
<!-- other rows removed for readability -->
<td><input type="checkbox" th:field="*{listOfUsers[__${i.index}__].userChecked}" /></td>
我需要带有属性的UserWrapper类列表<使用者> listOUsers
。但是怎么做呢?
我创建了这样的东西:
i need UserWrapper class with property List<User> listOUsers
. But how to do this ?I created something like this:
@Component
public class UserWrapper {
@Autowired
UserService userService;
List<User> listOfUsers = userService.findAll();
public List<User> getListOfUsers() {
return listOfUsers;
}
public void setListOfUsers(List<User> listOfUsers) {
this.listOfUsers = listOfUsers;
}
}
以下是此页面的控制器:
Here is my controller for this page:
@Controller
public class UserController {
@Autowired
UserService userService;
@Autowired
UserWrapper userWrapper;
@RequestMapping("/users")
public String home(Model model){
List<User> listOfUsers = userService.findAll();
model.addAttribute("listOfUsers", listOfUsers);
return "users";
}
@RequestMapping(value = "users", method = RequestMethod.POST)
public String deleteUser(User user, Model model){
userService.deleteCheckedUser(user);
return "redirect:/users";
}
}
此后我有错误:
org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'userController': Unsatisfied dependency expressed through field 'userWrapper'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'userWrapper' defined in file [C:\Users\luk89\Desktop\Java\STS Projects\StickyNotes\target\classes\com\twistezo\models\UserWrapper.class]: Instantiation of bean failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [com.twistezo.models.UserWrapper]: Constructor threw exception; nested exception is java.lang.NullPointerException
更新2
用户控制器:
@Controller
public class UserController {
@Autowired
UserService userService;
@Autowired
UserWrapper userWrapper;
@RequestMapping("/users")
public String home(Model model){
List<User> listOfUsers = userService.findAll();
userWrapper.setListOfUsers(listOfUsers);
for(User u : userWrapper.getListOfUsers()){
System.out.println("username: " +u.getUsername()+ ", checked?: " +u.isUserChecked());
}
model.addAttribute("listOfUsers", listOfUsers);
model.addAttribute("userWrapper", userWrapper);
return "users";
}
@RequestMapping(value = "/users", method = RequestMethod.POST)
public String deleteUser(@ModelAttribute UserWrapper userWrapper, Model model){
for(User u : userWrapper.getListOfUsers()){
System.out.println("username: " +u.getUsername()+ ", checked?: " +u.isUserChecked());
}
userService.deleteCheckedUser(userWrapper);
return "redirect:/users";
}
}
从我的服务类中删除方法:
Delete method from my service class:
@Override
public void deleteCheckedUser(UserWrapper userWrapper) {
for(User u : userWrapper.getListOfUsers()){
if(u.isUserChecked() == true){
this.userDAO.delete(u.getId());
}
}
}
结果:
username: user1, checked?: false
username: user2, checked?: false
username: user3, checked?: false
username: user4, checked?: false
username: user5, checked?: false
username: asd, checked?: false
username: qwe, checked?: false
username: xcv, checked?: false
username: ghj, checked?: false
username: dfh, checked?: false
username: n, checked?: false
username: ed, checked?: false
username: null, checked?: true
username: null, checked?: false
username: null, checked?: false
username: null, checked?: false
username: null, checked?: false
username: null, checked?: false
username: null, checked?: false
username: null, checked?: false
username: null, checked?: false
username: null, checked?: false
username: null, checked?: false
username: null, checked?: true
Thymeleaf部分现在很棒,但是当我在控制器中调用POST方法时,我的userWrap列表没有值。我正在尝试复制
Thymeleaf part wokrs great now, but my list from userWrap doesn't have values when i call POST method in controller. I was trying copy
List< User> listOfUsers = userService.findAll();
userWrapper.setListOfUsers(listOfUsers);
到POST方法但是有这样的情况:用户名:好的,检查了吗?:没有' t听鼠标点击复选框(所有值都为false)。
to POST method but there was situation: usernames: OK, checked?: doesn't listen mouse clicking to checkbox (all values are false).
推荐答案
列表中需要添加的每个音符的id另一个循环。例如,代替
For the listing the id of every note you need to add another loop. For example, instead of
<td th:text="${u.notes}"></td>
你需要类似的东西。
<td><span th:each="note, i: ${u.notes}" th:text="${(i.index > 0 ? ', ' : '') + note.id}" /></td>
-
复选框。您需要进行大量更改...
For the checkbox. You have a lot of changes you need to make...
- 所有复选框都必须位于
< ; form>< / form>
tags。 - 您需要一个具有用户列表作为属性的命令对象...我不认为您可以使用java List作为命令对象。需要将其指定为
< form>
标记上的th:对象。 - 实际复选框的html应该看起来如此类似这样的事情:
- All the checkboxes need to be within the
<form></form>
tags. - You need a command object that has a list of users as a property... I don't think you can use a java List as the command object. That needs to be specified as the th:object on the
<form>
tag. - The html for the actual checkbox should look something like this:
HTML
<form th:action="@{/users}" th:object="${userWrapper}" method="post">
<!-- other html removed for readability -->
<tr th:each="u, i : ${listOfUsers}">
<!-- other rows removed for readability -->
<td><input type="checkbox" th:field="*{users[__${i.index}__].userChecked}" /></td>
</tr>
</form>
控制器
@Controller
public class UserController {
@Autowired UserService userService;
@RequestMapping("/users")
public String home(Model model){
List<User> listOfUsers = userService.findAll();
UserWrapper userWrapper = new UserWrapper();
userWrapper.setListOfUsers(listOfUsers);
model.addAttribute("listOfUsers", listOfUsers);
model.addAttribute("userWrapper", userWrapper);
return "users";
}
@RequestMapping(value = "users", method = RequestMethod.POST)
public String deleteUser(@ModelAttribute UserWrapper userWrapper, Model model){
userService.deleteCheckedUser(userWrapper.getListOfUsers());
return "redirect:/users";
}
}
Java
public class UserWrapper {
List<User> listOfUsers = new ArrayList<>();
public List<User> getListOfUsers() {
return listOfUsers;
}
public void setListOfUsers(List<User> listOfUsers) {
this.listOfUsers = listOfUsers;
}
}
这篇关于Thymeleaf复选框没有传递值的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!