CODEWITHSUNDEEP
ajaxjsf-2primefaces
Lester
Lester

Reputation: 1870

Update component with Ajax results in Exception

It seems like I am simply unable to grasp, how updating components with Ajax works. I keep on getting an Exception "Cannot find component with identifier ":menu-item-container" referenced from "j_idt12:0:j_idt16:j_idt76"."

This is my code: 

<!DOCTYPE html>
    <html 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">

    <f:view contentType="text/html">
    <h:head>
        <title><ui:insert name="pageTitle"></ui:insert></title>
    </h:head>

    <h:body>
        <h:outputStylesheet library="css" name="style.css" />
        <div class="menu-navigation">
            <ul>
                <li>Menu</li>
                <ui:repeat var="category"
                    value="#{restaurantsBean.restaurant.categories}">
                    <h:form>
                        <li><p:commandLink update=":menu-item-container">
                                <div>
                                    #{category.name}
                                    <f:setPropertyActionListener              value="#{category.id}"
                                        target="#                   {restaurantMenuBean.selected}" />
                                </div>
                            </p:commandLink></li>
                    </h:form>
                </ui:repeat>
            </ul>
        </div>

        <div id="menu-item-container">

            <ui:repeat var="category"
                value="#{restaurantsBean.restaurant.categories}">
                <p:outputPanel>
                    <h:panelGroup id="pangroup" layout="block"
                        rendered="#{restaurantMenuBean.active(category.id)}">
                        <div class="some-heading">
                            <h2>#{category.name}</h2>
                        </div>
                        <div class="category-description">#{category.description}</div>

                        <ui:repeat var="item" value="#{category.items}">
                            <p:outputPanel
                                rendered="#{restaurantMenuBean.needLightbox(item)}">
                                <ui:include src="/lightbox-item.xhtml"></ui:include>
                            </p:outputPanel>
                            <p:outputPanel
                                rendered="#{!restaurantMenuBean.needLightbox(item)}">
                                <ui:include src="/nolightbox-item.xhtml"></ui:include>
                            </p:outputPanel>
                        </ui:repeat>

                    </h:panelGroup>
                </p:outputPanel>
            </ui:repeat>

        </div>
    </h:body>
    </f:view>
    </html>

This is the related area of html source output, which tells me, my "menu-item-container" is right at the root and the update-attribute only needs a separation marker ":" in front of its id.

<div id="menu-item-container"><span id="j_idt17:0:j_idt64"></span><span id="j_idt17:1:j_idt64"><div id="j_idt17:1:pangroup">
                        <div class="some-heading">

Upvotes: 0

Views: 423

Answers (1)

BalusC
BalusC

Reputation: 1108632

The to-be-updated components are resolved using the algorithm as described in UIViewRoot#findComponent(). It should be obvious that it can find fullworthy JSF components only.

Your menu-item-container is however a plain HTML <div> element and thus unavailable in the JSF component tree.

Replace it by a fullworthy JSF component.

<h:panelGroup id="menu-item-container" layout="block">

The <h:panelGroup> renders by default a <span> and the layout="block" turns it into a <div>.

Upvotes: 2

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