JSF Primefaces datatable处于cell editMode中，而不将编辑的值发送到托管bean

Question

我的问题是，当我编辑单词列表上的字符串时，我的侦听器方法不会接收到新的值。事实上，当我调用event.getNewValue()方法时，我得到的是旧值。

我错过了什么？

我使用的是JavaServer Faces 2.2、Primefaces 5.0和Spring Framework 4.0.3。

<h:body>
    <h:form id="mainEntityForm">
        <p:panelGrid columns="1" fullPage="true" id="dashboard">
            <f:facet name="header">
                <h2>MainEntity Table</h2>
            </f:facet>
            <p:panel>
                <f:facet name="header">
                    MainEntity List
                    <p:commandButton value="New MainEntity"
                        actionListener="#{mainEntityController.createMainEntityDialog}"
                        styleClass="header-button">
                        <p:ajax event="dialogReturn" update=":mainEntityForm:mainEntityTable" />
                    </p:commandButton>
                </f:facet>
                <p:dataTable id="mainEntityTable" var="mainEntity" value="#{mainEntityController.mainEntities}"
                    editable="true" editMode="cell" widgetVar="cellMainEntity"
                    selectionMode="single" selection="#{mainEntityController.selectedMainEntity}"
                    rowKey="#{mainEntity.id}" tableStyle="width:auto">

                    <p:ajax event="rowSelect" update=":mainEntityForm:stringGrid :mainEntityForm:entityAGrid :mainEntityForm:entityBGrid" />
                    <p:ajax event="cellEdit" listener="#{mainEntityController.onEditMainEntity}" update=":mainEntityForm:mainEntityTable" />

                    <p:column headerText="ID">
                        <h:outputText value="#{mainEntity.id}" />
                    </p:column>
                    <p:column headerText="Name">
                        <p:cellEditor>
                            <f:facet name="output">
                                <h:outputText id="nameOutput" value="#{mainEntity.name}" />
                            </f:facet>
                            <f:facet name="input">
                                <h:inputText id="atyInput" value="#{mainEntity.qty}" />
                            </f:facet>
                        </p:cellEditor>
                    </p:column>
                    <p:column headerText="Commands">
                        <p:commandButton title="Remove MainEntity" icon="ui-icon-trash"
                            actionListener="#{mainEntityController.deleteMainEntity(mainEntity)}"
                            update=":mainEntityForm:mainEntityTable" />
                    </p:column>
                </p:dataTable>
            </p:panel>
            <p:panelGrid fullPage="true" id="mainEntityDetail">
                <f:facet name="header">
                    <p:row>
                        <p:column colspan="4">
                            <h2>MainEntity Detail</h2>
                        </p:column>
                    </p:row>
                </f:facet>
                <p:row>
                    <p:column>
                        <p:panel>
                            <f:facet name="header">
                                Word List
                                <p:commandButton value="New Word"
                                        actionListener="#{mainEntityController.addNewWord()}"
                                        styleClass="header-button"
                                        update=":mainEntityForm:wordGrid">
                                </p:commandButton>
                            </f:facet>
                            <p:dataTable id="wordGrid" var="word"
                                value="#{mainEntityController.selectedMainEntity.wordList}"
                                tableStyle="width:auto" editable="true" editMode="cell" widgetVar="cellWord">

                                <p:ajax event="cellEdit" listener="#{mainEntityController.onEditWord}" />

                                <p:column headerText="Word">
                                    <p:cellEditor>
                                        <f:facet name="output">
                                            <h:outputText id="wordOutput" value="#{word}" />
                                        </f:facet>
                                        <f:facet name="input">
                                            <h:inputText id="wordInput" value="#{word}" />
                                        </f:facet>
                                    </p:cellEditor>
                                </p:column>
                                <p:column headerText="Commands">
                                    <p:commandButton title="Remove Word"
                                        icon="ui-icon-trash"
                                        actionListener="#{mainEntityController.removeWord(word)}"
                                        update=":mainEntityForm:wordGrid" />
                                </p:column>
                            </p:dataTable>
                        </p:panel>
                    </p:column>
                </p:row>
            </p:panelGrid>
        </p:panelGrid>
    </h:form>
</h:body>

@ManagedBean
@SessionScoped
public class MainEntityController {

    //...

    private MainEntity selectedMainEntity;

    public List<MainEntity> mainEntities;

    //...

    public MainEntity getSelectedMainEntity(){
        return selectedMainEntity;
    }

    public void setSelectedMainEntity(MainEntity mainEntity){
        this.selectedMainEntity = mainEntity;
    }

    //...

    public void onEditWord(CellEditEvent event) {
        Object oldValue = event.getOldValue();
        Object newValue = event.getNewValue();

        if(newValue != null && !newValue.equals(oldValue)) {

            // THE PROBLEM IS HERE
            // I NEVER ACTUALLY REACH THIS CODE
            // newValue is always equal to oldValue!

            FacesContext context = FacesContext.getCurrentInstance();
            String word = context.getApplication().evaluateExpressionGet(context, "#{word}", String.class);
            System.out.println(newValue);
            System.out.println(word);

            FacesMessage msg = new FacesMessage(FacesMessage.SEVERITY_INFO, "Word Changed", "Old: " + oldValue + ", New:" + newValue);
            FacesContext.getCurrentInstance().addMessage(null, msg);
        }
    }
}

@Entity
public class MainEntity {

    @Id
    private String id;

    @ElementCollection(fetch=FetchType.EAGER)
    @CollectionTable(
                name="MainEntity_Word",
                joinColumns = @JoinColumn(name = "id", referencedColumnName="id")
            )
    @Column(name = "word")
    private Set<String> wordList;

    //...

    public void addWord(String word) {
        this.wordList.add(word);
    }

    public void removeWord(String word) {
        this.wordList.remove(word);
    }

    public Set<String> getWordList() {
        return wordList;
    }

    public void setWordList(Set<String> wordList) {
        this.wordList = wordList;
    }
}

Answer 1

改变

<h:inputText id="wordInput" value="#{word}" />

至

<p:inputText id="wordInput" value="#{word}" />

或

<h:inputText id="wordInput" value="#{word}" >
<p:ajax event="change" process="@this"/>
</h:inputText>

<p:column headerText="Word" >
<p:cellEditor>
<f:facet name="output">
<h:outputText id="wordOutput" value="#{word}" />
</f:facet>
<f:facet name="input">
<h:inputText id="wordInput" value="#{word}" />
</f:facet>
</p:cellEditor>
</p:column>

<p:column headerText="Word" >
<p:cellEditor>
<f:facet name="output">
<h:outputText id="wordOutput" value="#{word}" />
</f:facet>
<f:facet name="input">
<p:inputText id="wordInput" value="#{word}" >
<p:ajax event="change" update="wordOutput" />
</p:inputText>
</f:facet>
</p:cellEditor>
</p:column>