Tuesday, October 14, 2008

Call method on page load in ADF

call method on page load in ADF – [JDeveloper Version 10.1.3]

In this example we will see how we can call a method inside your backing bean or application module when page is getting loaded.
The scenario I am taking here is you have to show the current row index of the view object row on page load in ADF table column.
1) Create a view object based on Job table in HR schema with name OnPageLoadJobVO. Do generate the VOImpl and VORowImpl java classes for the created view object.



2) Add a transient variable inside your view object with name
“myCurrentRowIndex”



3) Add the above created view Object inside your application module.
4) Add the following code inside your application module Impl class.

public void setJobCurrentRowIndex() {
System.out.println("I am here inside AM");
OnPageLoadJobVOImpl vo = getOnPageLoadJobVO1();
OnPageLoadJobVORowImpl row=null;
long fetchedRowCount = vo.getEstimatedRowCount();
RowSetIterator jobVoIter = vo.createRowSetIterator("jobVoIter");
if (fetchedRowCount > 0)
{
jobVoIter.setRangeStart(0);
jobVoIter.setRangeSize((int)fetchedRowCount);
for (int count = 0; count < fetchedRowCount; count++)
{
row=(OnPageLoadJobVORowImpl)jobVoIter.getRowAtRangeIndex(count);
row.setmyCurrentRowIndex(new Number(count));
}
}
jobVoIter.closeRowSetIterator();
}

5) Expose the above created method in application module to the client.
6) Drag and drop the OnPageLoadJobVO object to your jspx page as ADF read only table.
7) Create a new Managed bean using faces-config.xml with
name= OnPageLoadBackingBean and

class= OnPageLoadBean

8) Copy and paste the following code inside your newly created managed bean class.

package viewlayer.backing;
import javax.faces.application.Application;
import javax.faces.context.FacesContext;
import javax.faces.el.ValueBinding;
import model.common.AppModule;
import oracle.adf.controller.v2.lifecycle.Lifecycle;
import oracle.adf.controller.v2.lifecycle.PagePhaseEvent;
import oracle.adf.controller.v2.lifecycle.PagePhaseListener;


public class OnPageLoadBean implements PagePhaseListener{
public OnPageLoadBean() {
}
public void afterPhase(PagePhaseEvent event) {
}
public void beforePhase(PagePhaseEvent event) {
if (event.getPhaseId() == Lifecycle.PREPARE_MODEL_ID) {
if (!isPostback())
/*
System.out.println("i am here inside backing bean");
this.getApplicationModule().setJobCurrentRowIndex();
}
}
private boolean isPostback() {
return Boolean.TRUE.equals(resolveExpression("#{adfFacesContext.postback}"));
}
private Object resolveExpression(String expression) {
FacesContext ctx = FacesContext.getCurrentInstance();
Application app = ctx.getApplication();
ValueBinding bind = app.createValueBinding(expression);
return bind.getValue(ctx);
}
private AppModule getApplicationModule() {
return (AppModule)resolveExpression ("#data.AppModuleDataControl.dataProvider}");
}
}
9) Right click on your jspx page and go to your page definition. Where set the attribute ControllerClass inside your pageDefinition tag as the name of the managed bean.


Run your page to check the results.

5 comments:

James said...

Hi... thanks for this it's just what I need to do in my application. But I can't seem to get this to work in JDev 11g running ADF11g.. do you know if it should work?
Thanks

Vikram Kohli said...

Hi James,

In ADF 11g, you should make use of Method Call Activity, rather then going this way.

Check out "14.5.1 How to Add a Method Call Activity" in ADF fusion developer guide.

Krishnamoorthy said...

Thanks a Lot Vikram, it works fine

Karim H Abdellatif said...

Hello Vikram,
Great post, it works fine too in Jdev11g without method call activity

Regards
Karim

Gaurav said...

hello kohli,

i need a help, i want that at the tim eof page loading form should have no data. i have a solution but in this form opens in create mode which is not good. so please help me.

Gaurav