获取ui：托管bean中的param值

Question

I have the following p:tabView :

<p:tabView id="tabView" dynamic="true" cache="false" activeIndex="#{navigationController.activeTabIndex}"
    onTabChange="tabChangeCommand([{name:'index', value:index}])">
    <p:tab title="#{adbBundle['nav.manageUser']}" id="manageUserTab">
        <h:panelGroup layout="block">
            <h:form id="manageUserListForm">
                <ui:include src="/WEB-INF/includes/userList.xhtml">
                    <ui:param name="showOnlyActiveUsers" value="#{true}" />
                </ui:include>
            </h:form>
        </h:panelGroup>
    </p:tab>
    <p:tab title="#{adbBundle['nav.manageRole']}" id="manageRoleTab">
        <h:panelGroup layout="block">
            <h:form id="manageRoleListForm">
                <ui:include src="/WEB-INF/includes/userList.xhtml">
                    <ui:param name="manageRole" value="manageRole" />
                    <ui:param name="showOnlyActiveUsers" value="#{false}" />
                </ui:include>
            </h:form>
        </h:panelGroup>
    </p:tab>
</p:tabView>

The two tabs both of them have same include, ie, userList.xhtml . Inside this userList.xhtml I have placed a h:outputText to see the value of ui:param showOnlyActiveUsers for testing purpose:

<h:outputText id="showOnlyActiveUsers" value="#{showOnlyActiveUsers}" />

The value of this h:outputText changes from true to false on tab change and vice versa.

The managed bean UserListController which is in view scope is the back bone for userList.xhtml . Since it is in view scope it is instantiating once for all these two tabs.

I have a class UserDataModel which extends LazyDataModel of Primefaces. An instance of this class is present in UserListController . I am trying to set a value to a field of UserDataModel from the getter method of a h:inputHidden :

<h:inputHidden value="#{userListController.showActiveOnly}" />

which is in userList.xhtml from UserListController as:

public String getShowActiveOnly() {
    ValueExpression expression = getFacesContext().getApplication().getExpressionFactory().createValueExpression(getFaceletContext(), "#{showOnlyActiveUsers}", Boolean.class);
    userDataModel.setShowOnlyActiveUsers(expression.getValue(getFaceletContext());
    return "";
}

BUT the value which is generated by expression.getValue(getFaceletContext() is always false . I was wondering why the value in the h:outputText changes from true to false , but the value generated by ValueExpression is always false ?

How can I solve this issue. Any pointer would be very helpful to me.

Edit

protected final FaceletContext getFaceletContext() {
    return (FaceletContext) getFacesContext().getAttributes().get(FaceletContext.FACELET_CONTEXT_KEY);
}

What I want to achieve is to pass the ui:param value to the managed bean and from there to the data model.

Edit

userList.xhtml :

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

    <h:form id="userListForm">
        <p:panel id="userListPanel" header="#{adbBundle['userList.panel.header']}" toggleable="true">
            <p:dataTable var="user" id="userTable" value="#{userListController.userDataModel}" lazy="true" paginator="true" rows="10"
                paginatorPosition="bottom"
                paginatorTemplate="{CurrentPageReport}  {FirstPageLink} {PreviousPageLink} {PageLinks} {NextPageLink} {LastPageLink} {RowsPerPageDropdown}"
                rowsPerPageTemplate="10,50,100" widgetVar="userDataTable" styleClass="userTable" selectionMode="single">

                <f:facet name="header">
                    <p:outputPanel>
                        <h:panelGroup layout="block" id="resetFiter" styleClass="dataTableResetFilter">
                            <p:outputLabel value="#{adbBundle['filter.resetText']}" />
                            <p:spacer width="10" />
                            <p:commandButton icon="ui-icon-circle-close" actionListener="#{userListController.resetUserTable}"/>
                        </h:panelGroup>
                    </p:outputPanel>
                </f:facet>

                <p:column id="nameColumn" headerText="#{adbBundle['name']}" sortBy="#{user.fullName}" filterBy="#{user.fullName}" styleClass="name">
                    <h:outputText value="#{user.fullName}" />
                </p:column>

                <p:column id="statusColumn" headerText="#{adbBundle['status']}" sortBy="#{user.active}" styleClass="center status" filterBy="#{user.statusText}"
                    filterMatchMode="exact" filterOptions="#{userListController.statusOptions}">
                    <h:outputText value="#{user.statusText}" />
                </p:column>

                <p:column id="manageRoleColumn" headerText="#{adbBundle['role']}" sortBy="#{user.role}" styleClass="center manageRole" filterBy="#{user.role}"
                    filterOptions="#{userListController.roleOptions}" rendered="#{manageRole != null and manageRole != ''}">
                    <h:panelGroup layout="block">
                        <p:selectOneRadio id="roleRadio" value="#{user.role}" styleClass="roleRadio">
                            <f:selectItem itemValue="user" itemLabel="User" />
                            <f:selectItem itemValue="manager" itemLabel="Manager" />

                            <p:ajax listener="#{userListController.changeRole}" />
                            <f:attribute name="user" value="#{user}" />
                        </p:selectOneRadio>
                    </h:panelGroup>
                </p:column>
            </p:dataTable>
        </p:panel>

    </h:form>
</ui:composition>

What I want is to get the current value of that ui:param from the userList.xhtml and pass it to the managed bean by some event and set it to the datamodel . It is also true that the datamodel is instantiating only once when the managed bean is created as it is in view scope.

Answer 1

you can use something like this to display active users ,

<h:form id="userListForm">
    <p:panel id="userListPanel" header="#{adbBundle['userList.panel.header']}" toggleable="true">
        <p:dataTable var="user" id="userTable" value="#{userListController.userDataModel}" lazy="true" paginator="true" rows="10"
            paginatorPosition="bottom"
            paginatorTemplate="{CurrentPageReport}  {FirstPageLink} {PreviousPageLink} {PageLinks} {NextPageLink} {LastPageLink} {RowsPerPageDropdown}"
            rowsPerPageTemplate="10,50,100" widgetVar="userDataTable" styleClass="userTable" selectionMode="single">

            <f:facet name="header">
                <p:outputPanel>
                    <h:panelGroup layout="block" id="resetFiter" styleClass="dataTableResetFilter">
                        <p:outputLabel value="#{adbBundle['filter.resetText']}" />
                        <p:spacer width="10" />
                        <p:commandButton icon="ui-icon-circle-close" actionListener="#{userListController.resetUserTable}"/>
                    </h:panelGroup>
                </p:outputPanel>
            </f:facet>
            <ui:fragment rendered="#{showOnlyActiveUsers and user.active}">
            <p:column id="nameColumn" headerText="#{adbBundle['name']}" sortBy="#{user.fullName}" filterBy="#{user.fullName}" styleClass="name">
                <h:outputText value="#{user.fullName}" />
            </p:column>

            <p:column id="statusColumn" headerText="#{adbBundle['status']}" sortBy="#{user.active}" styleClass="center status" filterBy="#{user.statusText}"
                filterMatchMode="exact" filterOptions="#{userListController.statusOptions}">
                <h:outputText value="#{user.statusText}" />
            </p:column>

            <p:column id="manageRoleColumn" headerText="#{adbBundle['role']}" sortBy="#{user.role}" styleClass="center manageRole" filterBy="#{user.role}"
                filterOptions="#{userListController.roleOptions}" rendered="#{manageRole != null and manageRole != ''}">
                <h:panelGroup layout="block">
                    <p:selectOneRadio id="roleRadio" value="#{user.role}" styleClass="roleRadio">
                        <f:selectItem itemValue="user" itemLabel="User" />
                        <f:selectItem itemValue="manager" itemLabel="Manager" />

                        <p:ajax listener="#{userListController.changeRole}" />
                        <f:attribute name="user" value="#{user}" />
                    </p:selectOneRadio>
                </h:panelGroup>
            </p:column>
             </ui:fragment>   
        </p:dataTable>
    </p:panel>

</h:form>

also you can use boolean expression in this format

<ui:param name="showOnlyActiveUsers" value="false" />

Other solution could be to pass list of users to your ui include .Keep two methods 'userListController.userList' and 'userListController.activeUserList' and pass this as ui:param to your usersList.xhtml