HIde button on events

Question

Hi,
Can some body elaborate how to hide buttons on events.
Regards
Sameer

Answer 1

Hi,
You can use PPR.
Step 1. create a VO which contains one transient attribute of type boolean
Step 2. Base button rendered property using SPEL
Step 3. Initialize your VO for PPR(inintialization includes insertion of one row and set the attribute as True)
Step 4. In the event handler where you want to hide button just set it false.
Sample code:
//Code to hide button
public void handlePoApproveChangeEvent()
// Get the special, single-row application properties and make the first
// (only) row current.
OAViewObject vo = (OAViewObject)findViewObject("SampleBrowserPVO1");
OARow row = (OARow)vo.first();
// Get the value of the view object attribute with the PO Approval
// status.
OAViewObject poVO = (OAViewObject)findViewObject("PurchaseOrderHeadersVO1");
OARow poRow = (OARow)poVO.getCurrentRow();
String status = (String)poRow.getAttribute("StatusCode");
// Set the application property values based on the PO Approval
// status value.
if ("APPROVED".equals(status))
row.setAttribute("HideButton", Boolean.FLASE);
//Code to initialize VO
public void initializePPRExamplePage()
// Create purchase order header
OAViewObject appPropsVO =
(OAViewObject)findViewObject("SampleBrowserPVO1");
if (appPropsVO != null)
// If the VO already has a row, skip its initialization. Note that
// calling getFetchedRowCount() won't perform a DB hit on a VO with
// no SELECT and only transient attributes.
if (appPropsVO.getFetchedRowCount() == 0)
// Setting the match fetch size to 0 for an in-memory VO
// prevents it from trying to query rows.
// Calling executeQuery() is a small workaround to a known
// BC4J issue that ensures that modified rows in this
// transient view object are not lost after commit. See
// View Objects in Detail for additional information about
// both of these calls.
appPropsVO.setMaxFetchSize(0);
appPropsVO.executeQuery();
// You must create and insert a row in the VO before you can start
// setting properties.
Row row = appProposVO.createRow();
appPropsVO.insertRow(row);
// Set the primary key value for this single-row VO.
row = (OARow)appPropsVO.first();
row.setAttribute("RowKey", new Number(1));
row.setAttribute("HideButton",Boolean.TRUE);
// Initialize the application properties VO (and the UI) based on the
// default PO approval value set on the underlying object.
handlePoApproveChangeEvent();
else
// throw exception
} // end initializePPRExamplePage()
SPEL Parameter:
${oa.myVOName.HideButton}
Hope this help, Please refer JDeveloper guide for Topic Dynamic User Interface.
Regards,
Reetesh Sharma