数据表中的Richfaces 4错误，为空时使用datascroller验证

Question

I have a screen in my Richfaces application which uses a datatable and datascroller, with validation to ensure that data is filled. ( example to simulate the problem, full example can be found here

 <h:form id="articleForm" > <h:panelGroup layout="block"> <rich:messages globalOnly="true" /> <rich:dataTable value="#{productModifyBean.articles}" var="article" id="articleTable" rows="15" > <rich:column headerClass="headerOverflow artNrColumn"> <f:facet name="header"> <h:outputText value="articleNumber" /> </f:facet> <h:outputText value="#{article.articleNumber}"/> </rich:column> <rich:column headerClass="headerOverflow shortNameColumn"> <f:facet name="header"> <h:outputText value="Name" /> </f:facet> <h:outputText value="#{article.shortName}" /> </rich:column> <rich:column headerClass="headerOverflow quantityColumn" > <f:facet name="header"> <h:outputText value="Quantity" /> </f:facet> <h:inputText value="#{article.quantity}" required="true" requiredMessage="This is required" converterMessage="Error conversion" id="modifyArticleFormatQuantity" > </h:inputText> <rich:message for="modifyArticleFormatQuantity" errorClass="errorColorRed" /> </rich:column> </rich:dataTable> <rich:dataScroller for="articleTable" renderIfSinglePage="false" boundaryControls="show" fastControls="hide" execute="@form" render="articleTable" stepControls="show" style="float:right;" /> </h:panelGroup> <br style="clear: both" /> <br style="clear: both" /> <div align="right" style="clear: both"> <a4j:commandButton value="#{msgs['button.modify'] }" styleClass="submitButton" render="#{facesContext.validationFailed ? '@none' : 'articleForm'}" actionListener="#{productModifyBean.modifyProduct}"> </a4j:commandButton> </div> </h:form> 

Data validation should happen when the user presses the submit button ( to save the data) , and when the user using the pagination to go to a different page.

When clicking the submit button after leaving one field empty, the behaviour is normal : it shows an empty field with the remark 'this is required'

However, when instead moving to a different page ( for example clicking on the '2' page button ) , validation happens correctly, but the old value is put back into the screen, thus stating that the value should be filled but showing it filled in with a value.

Anyone have any idea what the reason for this problem could be, and how to resolve it ? Is this a bug in RichFaces, or am I overlooking something ?

Answer 1

I found the solution by trial and error :

If I change the datascroller to use render="@region" , the screen is correctly rendered.

 <rich:dataScroller for="articleTable" renderIfSinglePage="false" boundaryControls="show" fastControls="hide" execute="@form" render="articleTable"
                    stepControls="show" style="float:right;" />