Custom error message for Back Button Error

Question

I am using JDeveloper 9. I have tried to create a custom error message to handle a "Back button" press.
But the error message is usually ignored and the system's regular "Stale data" message appears. Is there a way to prevent the system's message from appearing and to raise a custom error message?

Answer 1

Do the following coding in your processRequest() of the Create or udpate page.
public void processRequest(OAPageContext pageContext, OAWebBean webBean)
super.processRequest(pageContext, webBean);
// If isBackNavigationFired = false, we're here after a valid navigation
// (the user selected the Create button) and we should proceed
// normally and initialize a new employee.
if (!pageContext.isBackNavigationFired(false))
// We indicate that we are starting the create transaction (this
// is used to ensure correct Back button behavior). Note that you
// can assign whatever name you want to your transaction unit.
TransactionUnitHelper.startTransactionUnit(pageContext, "empCreateTxn");
// This test ensures that we don't try to create a new employee if
// we had a JVM failover, or if a recycled application module
// is activated after passivation. If these things happen, BC4J will
// be able to find the row that you created so the user can resume
// work.
if (!pageContext.isFormSubmission())
OAApplicationModule am = pageContext.getApplicationModule(webBean);
// Call your method to handle creating the new row.
am.invokeMethod("createEmployee", null);
else
if (!TransactionUnitHelper.isTransactionUnitInProgress(pageContext, "empCreateTxn", true))
// Get the purchase order number from the request.
String orderNumber = pageContext.getParameter("headerId");
MessageToken[] tokens = { new MessageToken("PO_NUMBER", orderNumber)};
OAException message = new OAException("ICX", "FWK_TBX_T_PO_UPDATE_CONFIRM", tokens,
OAException.CONFIRMATION, null);
// We got here through some use of the browser "Back" button, so we
// want to display a state loss error and disallow access to the page.
// If this were a real application, we would probably display a more
// context-specific message telling the user they can't use the browser
// "Back" button on the "Create" page. Instead, we wanted to illustrate
// how to display the Applications standard NAVIGATION_ERROR message.
OADialogPage dialogPage = new OADialogPage(message);
pageContext.redirectToDialogPage(dialogPage);
} // end processRequest()
--Prasanna