How to set different view parameter programmatically in the same task flow

Question

Hello everyone,
I have a view activity A that calls another view activity B with a link. In this link the action is set to a method (I use JSFUtils class: http://jdeveloper-adf.googlecode.com/svn/trunk/TGPrototype2/ViewController/src/com/tgslc/defaultManagement/utils/JSFUtils.java):
public String goToB() {
String paramToPass = "someParameterTakenInSomeWay";
JSFUtils.setExpressionValue("#{pathToViewB_pageBPageDef.paramName}",paramToPass);
return "openActivityB";
where openActivityB is the control flow case to call B.
In the B pageDef file I have set a parameter "paramName" without any value:
<?xml version="1.0" encoding="UTF-8" ?>
<pageDefinition xmlns="http://xmlns.oracle.com/adfm/uimodel"
version="11.1.1.59.23" id="pageBPageDef">
<parameters>
<parameter id="paramName"
value=""/>
</parameters>
<executables/>
<bindings/>
</pageDefinition>
But at running time I have a oracle.jbo.expr.JIEvalException:
JBO-25077: Name paramName not found in the specified object: pathToViewB_pageBPageDef.
The question is: how can I set the parameter programmatically from the view activity A?
Note that I use this method to set the parameter because in the real application I have many "view activity A" that will call B, but all of these have to set this parameter.
I use JDeveloper 11.1.1.4.
Thanks in advance,
Baduel

Answer 1

Hi,
this is because PageDef B represents a binding container that is not active to the time you try to call it. The binding container becomes available when navigating to the page but not before. Instead:
1. define a managed bean in pageFlowScope and expose a setter/getter method to hold the value to pass on
2. Reference the managed bean in pageFlowScope from the attributebinding NDValue property using EL
3. Set the managed bean value before navigating to view B
Frank