a4j support and dynamically generated component

[sambolino]

greetings!

i have h:selectOneMenu, and h:panelGrid. onchange on the menu should trigger grid reRender.

The grid is created dynamically, so actually menu should set its new entity value to a bean1, then ask for grid rerender, and grid's bean2 knows how to access bean1, and according to the chosen entity generate the grid (the middle-tier part's accuracy shouldn't be doubted because when i add a commandbutton, and attach an action which rerenders whole page everything works fine).

so here's the code that doesn't work

<h:form>
 <rich:panel>
 <f:facet name="header">
 <h:outputText value="Add new address" />
 </f:facet>

 <h:selectOneMenu id="addressTypesSelectOne"
 styleClass="selectOneMenu"
 value="${addressService.spatialAddressType}" onchange="submit()">

 <s:selectItems value="#{addressBinder.allSpatialAddressTypes}"
 var="result" label="#{result.name}"
 noSelectionLabel="#{messages['select']}" />

 <s:convertEntity />
 <a4j:support event="onchange" reRender="pnlGrid" ajaxSingle="true" action="#{addressService.resetAllUnits}" />
 </h:selectOneMenu>
 <br />

 <h:panelGrid id="pnlGrid" columns="1"
 binding="#{addressLinker.generatedPanel}"></h:panelGrid>
 <div style="clear: both" />
 </rich:panel>
 </h:form>

thanks!

[sergeysmirnov]

you have an onchange="submit()" for selectOneMenu that produces non-Ajax request. At the same time, you attach a4j:support on the same event. This will cause double (ajax and non-ajax) requests with unpredictable result.

[sambolino]

i've changed code a bit according to richfaces demo

<a4j:outputPanel layout="block">
 <a4j:outputPanel ajaxRendered="true">
 <h:messages globalOnly="true" styleClass="message" />
 </a4j:outputPanel>

 <a4j:outputPanel layout="block">
 <h:form>
 <f:facet name="header">
 <h:outputText value="Add new address" />
 </f:facet>
 <h:selectOneMenu id="addressTypesSelectOne"
 styleClass="selectOneMenu"
 value="${addressService.spatialAddressType}">
 <s:selectItems value="#{addressBinder.allSpatialAddressTypes}"
 var="result" label="#{result.name}"
 noSelectionLabel="#{messages['select']}" />
 <s:convertEntity />
 <a4j:support event="onchange" reRender="out1"
 action="#{addressService.resetAllUnits}"></a4j:support>
 </h:selectOneMenu>
 <h:commandButton action="selectAddressType"
 value="Select address type" />
 </h:form>
 </a4j:outputPanel>

 <a4j:outputPanel id="out1" >
 <h:panelGrid columns="1" binding="#{addressLinker.generatedPanel}" ></h:panelGrid>
 </a4j:outputPanel>

 </a4j:outputPanel>

now, rerender happens, selectOneMenu sets value to the bean and a4j:support action is called. still, binding on the panelGrid is only called when i manually hit the button or refresh the page. i couldn't find an attribute which would tell "bind on every request" or so.

thanks

[ilya_shaikovsky]

addressLinker - should be request scoped.

[sambolino]

i'm using seam:

@Stateless
@Scope(ScopeType.STATELESS)
@Name("addressLinker")

i've also tried to put it as a managed bean (but still keeping seam annotations in the code)

<managed-bean-name>addressLinker</managed-bean-name>
<managed-bean-class>com.advsofttech.registeroffice.logic.AddressLinkerBean</managed-bean-class>
<managed-bean-scope>request</managed-bean-scope>


doesn't work this way either

[sambolino]

if i put static content inside "out1" a4j:outputpanel it works. seems like ajax doesn't work with component which is dynamically bound. is there a workaround more elegant than refreshing the UIViewRoot (because defining navigation rule that rerenders the whole page results in unexpected behavior).