当我使用viewAction和viewParam

Question

我有下一种情况。我试图在干净的项目中从项目中重新创建错误。

我有一个带有2个链接的简单索引页面

<ui:composition xmlns="http://www.w3.org/1999/xhtml"
            xmlns:ui="http://xmlns.jcp.org/jsf/facelets"
            xmlns:h="http://xmlns.jcp.org/jsf/html"
            xmlns:jsf="http://xmlns.jcp.org/jsf"
            xmlns:p="http://primefaces.org/ui"
            template="/WEB-INF/templates/template.xhtml">

<ui:define name="content">
    <h:form id="mainForm" enctype="multipart/form-data">
        <p:messages id="messages" showDetail="true" closable="true" autoUpdate="true">
        </p:messages>
        <div class="ui-fluid" jsf:id="itemForm">

            <p:commandLink actionListener="#{workRequestController.confirmWorkRequest}" update=":mainForm:itemForm">Send Parameter </p:commandLink>
            <br/>
            <br/>
            <p:link href="main.xhtml">LIST</p:link>

        </div>
    </h:form>

</ui:define>

第一个链接通过id参数= 1重定向到main.xhtml，因此：

@Named(value = "workRequestController")
@ViewScoped
public class WorkRequestController implements Serializable {

    public void confirmWorkRequest() throws IOException {
        Integer id = 1;
        ExternalContext context = FacesContext.getCurrentInstance().getExternalContext();
        context.redirect(context.getRequestContextPath() + "/main.xhtml?id=" + id);
    }
}

第二个链接无需参数即可直接重定向到主页，该主页的定义如下：

<ui:composition xmlns="http://www.w3.org/1999/xhtml"
                xmlns:ui="http://xmlns.jcp.org/jsf/facelets"
                xmlns:f="http://xmlns.jcp.org/jsf/core"
                xmlns:h="http://xmlns.jcp.org/jsf/html"
                xmlns:jsf="http://xmlns.jcp.org/jsf"
                xmlns:p="http://primefaces.org/ui"
                template="/WEB-INF/templates/template.xhtml">

    <ui:define name="scripts">
        <h:outputScript library="js" name="script.js"></h:outputScript>
    </ui:define>


    <ui:define name="metadata">
        <f:metadata>
            <f:viewParam name="id" value="#{beanController.workOrderId}"/>
            <f:viewAction action="#{beanController.resolveRequestParams}" phase="UPDATE_MODEL_VALUES" />
        </f:metadata>
    </ui:define>

    <ui:define name="content">
        <h:form id="mainForm" enctype="multipart/form-data">
            <p:messages id="messages" showDetail="true" closable="true" autoUpdate="true">
            </p:messages>
            <div class="ui-fluid" jsf:id="itemForm">
                <ui:include src="#{beanController.currentForm}" />
            </div>
        </h:form>
    </ui:define>


</ui:composition>

如果您看到为主页定义了元数据标签，以便在通过URL发送参数时捕获该参数。主页可以基于currentForm变量加载2个页面（List.xhtml或View.xhtml）。默认情况下为“ List.xhtml”，当从index.xhtml发送参数ID时，变量currentForm更改为View.xhtml。这样定义了bean控制器：

@Named(value = "beanController")
@ViewScoped
public class BeanController implements Serializable {

    private String workOrderId;
    protected String currentForm = "List.xhtml";
    private static List<Model> models;
    private Model model;
    private List<Client> clients;
    private Client client;

    //Initialization model
    static {
        models = new ArrayList<Model>();
        Model model1 = new Model(0, "Model 1", "Description 1");
        Model model2 = new Model(1, "Model 2", "Description 2");
        Model model3 = new Model(2, "Model 3", "Description 3");
        Model model4 = new Model(3, "Model 4", "Description 4");
        Model model5 = new Model(4, "Model 5", "Description 5");
        Model model6 = new Model(5, "Model 6", "Description 6");
        Model model7 = new Model(6, "Model 7", "Description 7");
        Model model8 = new Model(7, "Model 8", "Description 8");

        models.add(model1);
        models.add(model2);
        models.add(model3);
        models.add(model4);
        models.add(model5);
        models.add(model6);
        models.add(model7);
        models.add(model8);
    }

    public void resolveRequestParams() {
        if(workOrderId != null){
            Integer workId = Integer.valueOf(workOrderId);
            model = models.get(workId);
            currentForm = "View.xhtml";
        } else {
            currentForm = "List.xhtml";
        }
    }


    public String getWorkOrderId() {
        return workOrderId;
    }

    public void setWorkOrderId(String workOrderId) {
        this.workOrderId = workOrderId;
    }

    public String getCurrentForm() {
        return currentForm;
    }

    public void setCurrentForm(String currentForm) {
        this.currentForm = currentForm;
    }

    public List<Model> getModels() {
        return models;
    }

    public void setModels(List<Model> models) {
        this.models = models;
    }

    public Model getModel() {
        return model;
    }

    public void setModel(Model model) {
        this.model = model;
    }

    public List<Client> getClients() {
        clients = new ArrayList<Client>();
        Client client1 = new Client(1, "Charles");
        Client client2 = new Client(2, "Michael");
        Client client3 = new Client(3, "Kevin");
        Client client4 = new Client(4, "Jason");
        clients.add(client1);
        clients.add(client2);
        clients.add(client3);
        clients.add(client4);

        return clients;
    }

    public void setClients(List<Client> clients) {
        this.clients = clients;
    }

    public Client getClient() {
        return client;
    }

    public void setClient(Client client) {
        this.client = client;
    }

    public void onSelectClient() {
        model.setClient(client);
    }

    public void prepareView(){

        if(model == null){
            currentForm = "List.xhtml";
        }
        else {

            currentForm = "View.xhtml";

        }

    }

    public void close(){
        model = null;
        currentForm = "List.xhtml";
    }

}

因此定义了List.xhtml：

<ui:composition xmlns:ui="http://xmlns.jcp.org/jsf/facelets"
                xmlns:h="http://xmlns.jcp.org/jsf/html"
                xmlns:p="http://primefaces.org/ui"
                xmlns="http://www.w3.org/1999/xhtml">

    <p:commandLink actionListener="#{beanController.prepareView}"  update=":mainForm:itemForm">View
    </p:commandLink>
    <br/>
    <br/>
    <p:dataTable var="model" value="#{beanController.models}" selection="#{beanController.model}" rowKey="#{model.id}">

        <p:column selectionMode="single" style="width: 42px"
                  styleClass="align-center"
                  priority="1"/>

        <p:column headerText="Id">
            <h:outputText value="#{model.id}" />
        </p:column>

        <p:column headerText="Name">
            <h:outputText value="#{model.name}" />
        </p:column>

        <p:column headerText="Description">
            <h:outputText value="#{model.description}" />
        </p:column>

    </p:dataTable>

</ui:composition>

和View.xhtml这样：

<ui:composition xmlns:ui="http://xmlns.jcp.org/jsf/facelets"
                xmlns:h="http://xmlns.jcp.org/jsf/html"
                xmlns:p="http://primefaces.org/ui"
                xmlns="http://www.w3.org/1999/xhtml"
                xmlns:f="http://xmlns.jcp.org/jsf/core">


    <p:commandLink onclick="PF('ClientList').show();" value="Open Dialog"/>
    <br/>
    <br/>
    <p:commandLink actionListener="#{beanController.close}" value="Close" update=":mainForm:itemForm"/>
    <br/>
    <br/>
    <p:inputText id="id" value="#{beanController.model.id}" disabled="true"/>
    <p:inputText id="name" value="#{beanController.model.name}" disabled="true"/>
    <p:inputText id="description" value="#{beanController.model.description}" disabled="true"/>
    <p:inputText id="client" value="#{beanController.model.client.name}" disabled="true"/>

    <p:dialog id="ClientListDialog"
              modal="true"
              widgetVar="ClientList"
              resizable="false"
              closable="true"
              appendTo="@(body)"
              closeOnEscape="true">
        <h:form>
            <p:dataTable id="ClientTable"
                         class="fit-content-table"
                         binding="#{clients}"
                         value="#{beanController.clients}"
                         var="item"
                         rowKey="#{item.id}"
                         paginator="true"
                         paginatorAlwaysVisible="true"
                         paginatorPosition="top"
                         selection="#{beanController.client}"
                         selectionMode="single"
                         widgetVar="ClientTable">

                <p:ajax event="rowSelect" listener="#{beanController.onSelectClient}"
                        onstart="PF('ClientList').hide();"
                        update=":mainForm:client"/>


                <p:column>
                    <f:facet name="header">
                        <h:outputText value=""/>
                    </f:facet>
                    <h:outputText value=""/>
                </p:column>

                <p:column sortBy="#{item.name}" filterBy="#{item.id}">
                    <f:facet name="header">
                        <h:outputText value="Id"/>
                    </f:facet>
                    <h:outputText value="#{item.id}"/>
                </p:column>

                <p:column sortBy="#{item.name}" filterBy="#{item.name}">
                    <f:facet name="header">
                        <h:outputText value="Name"/>
                    </f:facet>
                    <h:outputText value="#{item.name}"/>
                </p:column>

            </p:dataTable>
        </h:form>
    </p:dialog>
</ui:composition>

问题发生在从索引页面发送参数的瞬间加载View页面时，在这种情况下，是在View页面中加载了模型，但是当我为对话框中显示的表选择行时，不会为event =“ rowSelect”执行侦听器beanController.onSelectClient，而如果从“列表”页面加载了“查看”页面却没有通过URL发送参数，则侦听器将起作用。