【发布时间】：2018-05-08 08:37:35
【问题描述】：
当我从dataTable中选择一个组时，我想在pickList中显示相应的用户。当我在 pickList 中移动一些用户时，我希望这些新值在提交值之前保存在 bean 的对象中，或者在更改 dataTable 中的选择之前。
当我将用户从源 pickList 移动到目标 pickList（反之亦然），然后更改 dataTable 中的选择时，pickList 源值和目标值与填充时的值保持一致。
用户.java
package com.test.model;
public class User {
private String userName;
public User(String userName) {
this.userName = userName;
}
public String getUserName() {
return userName;
}
public void setUserName(String userName) {
this.userName = userName;
}
}
Group.java
package com.test.model;
import java.util.List;
public class Group {
private String groupName;
private List<User> users;
public Group(String groupName, List<User> users) {
this.groupName = groupName;
this.users = users;
}
public String getGroupName() {
return groupName;
}
public void setGroupName(String groupName) {
this.groupName = groupName;
}
public List<User> getUsers() {
return users;
}
public void setUsers(List<User> users) {
this.users = users;
}
}
UserBean.java
package com.test.beans;
import java.util.ArrayList;
import java.util.List;
import javax.annotation.PostConstruct;
import javax.faces.bean.ManagedBean;
import javax.faces.bean.ViewScoped;
import com.test.model.Group;
import com.test.model.User;
import org.primefaces.model.DualListModel;
@ManagedBean
@ViewScoped
public class UserBean {
private List<Group> groups = new ArrayList<>();
private List<User> allUsers = new ArrayList<>();
private Group selectedGroup;
private DualListModel<User> users = new DualListModel<>();
public List<Group> getGroups() {
return groups;
}
public Group getSelectedGroup() {
return selectedGroup;
}
public void setSelectedGroup(Group selectedGroup) {
this.selectedGroup = selectedGroup;
}
public DualListModel<User> getUsers() {
return users;
}
public void setUsers(DualListModel<User> users) {
this.users = users;
}
@PostConstruct
private void init() {
List<User> usersGroup1 = new ArrayList<>();
usersGroup1.add(new User("User1"));
usersGroup1.add(new User("User2"));
List<User> usersGroup2 = new ArrayList<>();
usersGroup2.add(new User("User3"));
usersGroup2.add(new User("User4"));
allUsers.addAll(usersGroup1);
allUsers.addAll(usersGroup2);
groups.add(new Group("Group1", usersGroup1));
groups.add(new Group("Group2", usersGroup2));
}
public void onRowSelect() {
// here I want to save the picklist source, but it is already reset
List<User> storeUsers = users.getSource();
fillPickList();
}
private void fillPickList() {
List<User> assignedUsers = new ArrayList<>();
List<User> availableUsers = new ArrayList<>();
assignedUsers.addAll(selectedGroup.getUsers());
availableUsers.addAll(allUsers);
for (User user : assignedUsers) {
if (availableUsers.contains(user))
availableUsers.remove(user);
}
users.setSource(assignedUsers);
users.setTarget(availableUsers);
}
}
index.xhtml
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml"
xmlns:h="http://java.sun.com/jsf/html"
xmlns:p="http://primefaces.org/ui">
<h:head>
<link rel="shortcut icon" type="image/x-icon" href="#{resource['images/favicon.ico']}"/>
</h:head>
<h:body>
<h:form>
<p:dataTable value="#{userBean.groups}"
var="group"
selectionMode="single"
selection="#{userBean.selectedGroup}"
rowKey="#{group.groupName}">
<p:column headerText="Groups">
<h:outputText value="#{group.groupName}"/>
</p:column>
<p:ajax event="rowSelect"
listener="#{userBean.onRowSelect}"
update="@form"/>
</p:dataTable>
<p:pickList value="#{userBean.users}"
var="user"
itemLabel="#{user.userName}"
itemValue="#{user.userName}"/>
</h:form>
</h:body>
</html>
【问题讨论】：
-
请在开发模式下运行您的应用程序，看看是否有任何错误。并且总是创建一个minimal reproducible example 来帮助我们确定问题可能在哪里。现在有很多可能的原因是看不见的。在多个问题中“猜测”或询问更多细节太费时间
-
我不明白这个问题。 “我希望在提交值之前将这些新值保存在 bean 的对象中” - 什么？您不想将值发送到服务器，但希望它们只出现在服务器上？
-
我希望能够修改来自多个组的用户，然后一起保存这些更改
标签： primefaces jsf-2