SelectBooleanCheckbox 呈现的状态与支持 bean 不匹配

发布于 2024-12-27 22:59:20 字数 4014 浏览 2 评论 0原文

我正在使用 JSF2.0 并正在构建一个向导。我遇到了 SelectBooleanCheckboxes 的问题。工作流程如下：

加载带有复选框的页面（值绑定到支持 bean 中的 SortedMap）。
勾选它们，然后单击下一步。这会增加一个光标，页面使用该光标来确定加载哪个PanelGroup。
（正确的）值被保存到 bean 中。
单击返回（光标递减），页面呈现可编辑复选框。第一个复选框未选中（即使该框的绑定变量的值为 true）。

这种基于光标的方法（包含所有向导屏幕）似乎不起作用。但是，如果我稍微修改一下，使上一个/下一个按钮显示不同的 xhtml 页面，这个问题就会消失。

不幸的是我不能这样做。我们将把这个向导插入到模式对话框中，因此访问上一个/下一个新页面将不起作用，

我已经编写了一个这样的小示例（而不是要求您费力地完成整个向导）。

这是 Java 类：

@ConversationScoped
@Named("hashBool")
public class HashBoolTest2 implements Serializable {   

    private static final long serialVersionUID = 1962031429874426411L;

    @Inject private Conversation conversation;

    private List<RestrictionItem> list;
    private SortedMap<String, Boolean> values;

    private int cursor;

    public HashBoolTest2( ) {
        List<String> none = new ArrayList<String>();
        none.add("");

        this.setList( new ArrayList< RestrictionItem >( ) );
        this.getList().add( new RestrictionItem( "a", "a", none ) );
        ...
        this.getList().add( new RestrictionItem( "e", "e", none ) );

        this.setValues( new TreeMap< String, Boolean >() );

        this.setCursor( 0 );
    }

    @PostConstruct
    public void andThis() {
        this.conversation.begin( );
    }

    // getters and setters for instance variables

    @Override
    public String toString() {
        return "Values : " + this.values.toString( ) + " List: " + this.list.toString( );
    }

    public void kill() {
        this.conversation.end( );
    }

    public void doNext(ActionEvent e) {
        this.cursor++;
    }

    public void doPrev(ActionEvent e) {
        this.cursor--;
    }
}

这是 XHTML 片段：

<?xml version="1.0" encoding="ISO-8859-1" ?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"
  xmlns:ui="http://java.sun.com/jsf/facelets"
  xmlns:h="http://java.sun.com/jsf/html"
  xmlns:f="http://java.sun.com/jsf/core"
  xmlns:c="http://java.sun.com/jsp/jstl/core">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1" />
<title>IGNORED</title>
</head>
<body>
  <ui:composition>
    <h:panelGroup id="container">
      <h:form>
        <!-- edit state -->
        <h:panelGroup id="edit" rendered="#{hashBool.cursor eq 0}">
            <code>
              <h:outputText value="#{hashBool.toString()}" escape="false"/>
            </code>

            <ul>
              <ui:repeat value="#{hashBool.list}" var="elem">
                <li>
                  <h:selectBooleanCheckbox id="elem" value="#{hashBool.values[elem.id]}" title="#{elem.displayName}" />
                  <h:outputLabel for="elem" value="#{elem.displayName}"/>
                </li>
              </ui:repeat>
            </ul>
        </h:panelGroup>

        <!-- view state -->
        <h:panelGroup id="view" rendered="#{hashBool.cursor eq 1}">
          <code>
            <h:outputText value="#{hashBool.toString()}" escape="false"/>
          </code>
        </h:panelGroup>

        <br/>

        <!-- buttons -->
        <h:panelGroup id="buttons">
          <f:ajax render=":container">
            <h:commandButton value="Prev" actionListener="#{hashBool.doPrev}"/>
            <h:commandButton value="Next" actionListener="#{hashBool.doNext}"/>
          </f:ajax>
          <h:commandButton value="Kill" actionListener="#{hashBool.kill()}"/>
        </h:panelGroup>

      </h:form>
    </h:panelGroup>
  </ui:composition>
</body>
</html>

欢迎任何建议！（抱歉，如果这是重复的帖子，我在此处搜索时无法发现类似的内容）

原文

I'm using JSF2.0 and am building up a wizard. I have encountered a problem with SelectBooleanCheckboxes. Here is the workflow:

Load page with checkboxes (values are bound to a SortedMap in the backing bean).
Tick them, and click next. This increments a cursor, which the page uses to determine which PanelGroup the load.
The (correct) values are persisted to the bean.
Click back (cursor is decremented) and page renders the editable checkboxes. The first checkbox is not ticked (even though the bound variable holds a value of true for that box).

This cursor-based approach (which contains all of the wizard screens) doesn't seem to work. However, if i slightly modify this so that the prev/next buttons bring up different xhtml pages, this issue disappears.

Unfortunately I cant do this. We are going to plug this wizard into a modal dialog, so visiting a new page on prev/next will not work

I've written up a smallish example of this (rather than asking you to wade through the entire wizard).

Here is the Java class:

@ConversationScoped
@Named("hashBool")
public class HashBoolTest2 implements Serializable {   

    private static final long serialVersionUID = 1962031429874426411L;

    @Inject private Conversation conversation;

    private List<RestrictionItem> list;
    private SortedMap<String, Boolean> values;

    private int cursor;

    public HashBoolTest2( ) {
        List<String> none = new ArrayList<String>();
        none.add("");

        this.setList( new ArrayList< RestrictionItem >( ) );
        this.getList().add( new RestrictionItem( "a", "a", none ) );
        ...
        this.getList().add( new RestrictionItem( "e", "e", none ) );

        this.setValues( new TreeMap< String, Boolean >() );

        this.setCursor( 0 );
    }

    @PostConstruct
    public void andThis() {
        this.conversation.begin( );
    }

    // getters and setters for instance variables

    @Override
    public String toString() {
        return "Values : " + this.values.toString( ) + " List: " + this.list.toString( );
    }

    public void kill() {
        this.conversation.end( );
    }

    public void doNext(ActionEvent e) {
        this.cursor++;
    }

    public void doPrev(ActionEvent e) {
        this.cursor--;
    }
}

Here is the XHTML fragment:

<?xml version="1.0" encoding="ISO-8859-1" ?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"
  xmlns:ui="http://java.sun.com/jsf/facelets"
  xmlns:h="http://java.sun.com/jsf/html"
  xmlns:f="http://java.sun.com/jsf/core"
  xmlns:c="http://java.sun.com/jsp/jstl/core">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1" />
<title>IGNORED</title>
</head>
<body>
  <ui:composition>
    <h:panelGroup id="container">
      <h:form>
        <!-- edit state -->
        <h:panelGroup id="edit" rendered="#{hashBool.cursor eq 0}">
            <code>
              <h:outputText value="#{hashBool.toString()}" escape="false"/>
            </code>

            <ul>
              <ui:repeat value="#{hashBool.list}" var="elem">
                <li>
                  <h:selectBooleanCheckbox id="elem" value="#{hashBool.values[elem.id]}" title="#{elem.displayName}" />
                  <h:outputLabel for="elem" value="#{elem.displayName}"/>
                </li>
              </ui:repeat>
            </ul>
        </h:panelGroup>

        <!-- view state -->
        <h:panelGroup id="view" rendered="#{hashBool.cursor eq 1}">
          <code>
            <h:outputText value="#{hashBool.toString()}" escape="false"/>
          </code>
        </h:panelGroup>

        <br/>

        <!-- buttons -->
        <h:panelGroup id="buttons">
          <f:ajax render=":container">
            <h:commandButton value="Prev" actionListener="#{hashBool.doPrev}"/>
            <h:commandButton value="Next" actionListener="#{hashBool.doNext}"/>
          </f:ajax>
          <h:commandButton value="Kill" actionListener="#{hashBool.kill()}"/>
        </h:panelGroup>

      </h:form>
    </h:panelGroup>
  </ui:composition>
</body>
</html>

Any suggestions are welcome! (And sorry if this is a double post, i havnt been able to uncover anything similar while searching here)

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飘逸的'云 2025-01-03 22:59:20

主要是为了确保古人的智慧得到正确记录 (http://xkcd.com/979/)：事实证明这是 JSF 2.0.2（与 Liferay 6.0 GA 4 捆绑在一起）中的一个错误。请参阅此处了解更多信息：http://java.net/jira/browse/JAVASERVERFACES-1561

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