How to initialize an adf component before a page loads

Question

Hi all
I use JDeveloper 11.1.2.2.0
I have two pages:
first page has a link to a second page
<af:document title="first.jspx" id="d1">
  <af:form id="f1">
    <af:commandLink text="Page 2" id="cl1" action="goToSecondPage" actionListener="#{Bean.handleLinkActionEvent}"/>
  </af:form>
</af:document>and the second page has an inputText component:
<af:document title="second.jspx" id="d1">
  <af:form id="f1">
    <af:inputText label="Text" id="it1" binding="#{Bean.inputText}" readOnly="true"/>
  </af:form>
</af:document>First I load first.jspx and than I click the link. This event is handled in handleLinkActionEvent() method, in which I want to set a value to the inputText component of the second page. But I can't do it, because as expected I get NullPointerException.
So the question is how to initialize an adf component before a page loads?
Evgeny Michuk
Edited by: Evgeny Michuk on Oct 4, 2012 11:30 PM

Answer 1

Thanks a lot for your replies and links, it gives me some new knowledges.
I got your approach and achieved the aim for the described situation with tag <f:setPropertyActionListener>:
<af:commandLink text="Page 2" id="cl1" action="goToSecondPage"
                       actionListener="#{Bean.handleLinkActionEvent}" binding="#{Bean.firstPageLink}">
  <f:setPropertyActionListener target="#{pageFlowScope.text}" value="Hello, World!"/>
</af:commandLink>and for the inputText component I set the value:
<af:inputText label="Text" id="it1"  binding="#{Bean.inputText}"
                              readOnly="true" value="#{pageFlowScope.text}"/>I used request scoped managed bean and it is shared for both pages.
I understand that I can set a value of some attribute for managed bean
and use it to set a value for inputText component of the second page,
but as I understand it is almost the same way as usage of tag <f:setPropertyActionListener>.
In my real situation on the second page I have a dynamic table, and it's field is read only.
Structure of this table depends on a link clicked on the first page.
So I define components for table columns in runtime, it may be outputText, inputDate, goLink and some others.
And I have to get table through the UIComponent binding to set columns.
Certainly I can define all needed components for all columns
and render it according to the column types
<af:table value="#{Bean.collectionModel}" var="row" id="t1" binding="#{Bean.mainTable}">
   <af:forEach items="#{Bean.columnDescriptionList}" var="column">
      <af:column headerText="#{column.caption}" id="c1">
         <af:outputText value="#{row[column.fieldName]}" id="ot1" rendered="#{column.type == '1'}"/>
         <af:inputDate value="#{row[column.fieldName]}" id="ot2" rendered="#{column.type == '2'}"/>
         <af:selectBooleanCheckbox id="sbc1" selected="#{row[column.fieldName] == '1'}" rendered="#{column.type == 'n'}"/>
      </af:column>
   </af:forEach>
</af:table>but I think it is not very good.
Have you any idea?
P.S. I hope I clearly explained my situation =)
Evgeny Michuk