JSF和Primefaces：组件ID无法找到

Question

I keep receiving the same exception again and again. Comparing exception and hmtl-output without for="#{choiceRadio.clientId}" seems to tell me that binding works. But it just doesn't and I feel like I am missing something huge.

The Code:

    <p:selectOneRadio binding="#{choiceRadio}" value="#" layout="custom">
        <f:selectItems value="#" />
    </p:selectOneRadio>

    <h:panelGrid columns="1">
        <ui:repeat var='choice' value='#{item.items3}'>
            <p:radioButton for="#{choiceRadio.clientId}" />#{choice.name}
        </ui:repeat>
    </h:panelGrid>

</h:form>

The Exception:

HTTP Status 500 -

type Exception report

message

description The server encountered an internal error () that prevented it from fulfilling this request.

exception

javax.servlet.ServletException: Cannot find component 'j_idt34:0:j_idt36:2:j_idt46:j_idt82' in view.
    javax.faces.webapp.FacesServlet.service(FacesServlet.java:606)
    org.jboss.weld.servlet.ConversationPropagationFilter.doFilter(ConversationPropagationFilter.java:62)
root cause

javax.faces.FacesException: Cannot find component 'j_idt34:0:j_idt36:2:j_idt46:j_idt82' in view.
    org.primefaces.component.radiobutton.RadioButtonRenderer.findSelectOneRadio(RadioButtonRenderer.java:126)
    org.primefaces.component.radiobutton.RadioButtonRenderer.encodeEnd(RadioButtonRenderer.java:35)
    javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:875)
    javax.faces.component.UIComponent.encodeAll(UIComponent.java:1786)
    com.sun.faces.facelets.component.RepeatRenderer.encodeChildren(RepeatRenderer.java:104)
    com.sun.faces.facelets.component.UIRepeat.process(UIRepeat.java:523)
    com.sun.faces.facelets.component.UIRepeat.encodeChildren(UIRepeat.java:984)
    com.sun.faces.renderkit.html_basic.HtmlBasicRenderer.encodeRecursive(HtmlBasicRenderer.java:304)
    com.sun.faces.renderkit.html_basic.GridRenderer.renderRow(GridRenderer.java:185)
    com.sun.faces.renderkit.html_basic.GridRenderer.encodeChildren(GridRenderer.java:129)
    javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:845)
    javax.faces.component.UIComponent.encodeAll(UIComponent.java:1779)
    javax.faces.render.Renderer.encodeChildren(Renderer.java:168)
    javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:845)
    com.sun.faces.renderkit.html_basic.HtmlBasicRenderer.encodeRecursive(HtmlBasicRenderer.java:304)
    com.sun.faces.renderkit.html_basic.GroupRenderer.encodeChildren(GroupRenderer.java:105)
    javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:845)
    com.sun.faces.renderkit.html_basic.HtmlBasicRenderer.encodeRecursive(HtmlBasicRenderer.java:304)
    com.sun.faces.renderkit.html_basic.GroupRenderer.encodeChildren(GroupRenderer.java:105)
    javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:845)
    javax.faces.component.UIComponent.encodeAll(UIComponent.java:1779)
    org.primefaces.component.lightbox.LightBoxRenderer.encodeMarkup(LightBoxRenderer.java:52)
    org.primefaces.component.lightbox.LightBoxRenderer.encodeEnd(LightBoxRenderer.java:32)
    javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:875)
    org.primefaces.renderkit.CoreRenderer.renderChild(CoreRenderer.java:59)
    org.primefaces.renderkit.CoreRenderer.renderChildren(CoreRenderer.java:43)
    org.primefaces.component.outputpanel.OutputPanelRenderer.encodeEnd(OutputPanelRenderer.java:46)
    javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:875)
    javax.faces.component.UIComponent.encodeAll(UIComponent.java:1786)
    com.sun.faces.facelets.component.RepeatRenderer.encodeChildren(RepeatRenderer.java:104)
    com.sun.faces.facelets.component.UIRepeat.process(UIRepeat.java:523)
    com.sun.faces.facelets.component.UIRepeat.encodeChildren(UIRepeat.java:984)
    com.sun.faces.renderkit.html_basic.HtmlBasicRenderer.encodeRecursive(HtmlBasicRenderer.java:304)
    com.sun.faces.renderkit.html_basic.GroupRenderer.encodeChildren(GroupRenderer.java:105)
    javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:845)
    org.primefaces.renderkit.CoreRenderer.renderChild(CoreRenderer.java:55)
    org.primefaces.renderkit.CoreRenderer.renderChildren(CoreRenderer.java:43)
    org.primefaces.component.outputpanel.OutputPanelRenderer.encodeEnd(OutputPanelRenderer.java:46)
    javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:875)
    javax.faces.component.UIComponent.encodeAll(UIComponent.java:1786)
    com.sun.faces.facelets.component.RepeatRenderer.encodeChildren(RepeatRenderer.java:104)
    com.sun.faces.facelets.component.UIRepeat.process(UIRepeat.java:523)
    com.sun.faces.facelets.component.UIRepeat.encodeChildren(UIRepeat.java:984)
    javax.faces.component.UIComponent.encodeAll(UIComponent.java:1779)
    javax.faces.component.UIComponent.encodeAll(UIComponent.java:1782)
    javax.faces.component.UIComponent.encodeAll(UIComponent.java:1782)
    com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:402)
    com.sun.faces.application.view.MultiViewHandler.renderView(MultiViewHandler.java:125)
    javax.faces.application.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:288)
    com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:121)
    com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
    com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:139)
    javax.faces.webapp.FacesServlet.service(FacesServlet.java:594)
    org.jboss.weld.servlet.ConversationPropagationFilter.doFilter(ConversationPropagationFilter.java:62)
note The full stack trace of the root cause is available in the JBoss Web/7.0.13.Final logs.

JBoss Web/7.0.13.Final

Without ui:repeat I don't get any exception but without ui:repeat I do not have any content either:

    <p:selectOneRadio  id="myRadio" value="#{cartBean.selectedChoice}" layout="custom">
        <f:selectItems value="#{item.items3}" />
    </p:selectOneRadio>

    <h:panelGrid columns="1">

            <p:radioButton for="myRadio" value="hh" itemIndex="0"/>

    </h:panelGrid>

</h:form>

Answer 1

The for attribute of the radioButton must be the id of the selectOneRadio it refers to.

Add an id to your selectOneRadio and refer to it in the button:

<p:selectOneRadio id="myRadio" binding="#{choiceRadio}" value="#" layout="custom">
    <f:selectItems value="#" />
</p:selectOneRadio>

<h:panelGrid columns="1">
    <ui:repeat var='choice' value='#{item.items3}'>
        <p:radioButton for="myRadio" />#{choice.name}
    </ui:repeat>
</h:panelGrid>

EDIT

You might need to prepend the ids of all NamingContainer s right from ViewRoot before the element id , like: for="form_id:myRadio" .

When in doubt what the exact absolute id of an element might be, look at it in FireBug (Firefox) or developer tools (Chrome) or search for its given id (in this case "myRadio") in the html output source and skip possible numbers in-between.

So this

id="iterateCategories:0:iterateItems:2:lightForm:radioForm"

would become

iterateCategories:iterateItems:lightForm:radioForm

as your absolute id.