OAF - Oracle Application Framework - Frequently Used Items For User Action.

Following is the way you can catch the event for an item based on its item style.

SNO	Component Name(Item Style)	How to Catch the event in CO
1	submitButton	You can catch the submit button in two ways : 1.       Here : save is item id  if(pageContext.getParameter("save")!=null) 2.       Here  requestTypeAction   is the action event name mentioned on the item in client Action (Action Type) if("requestTypeAction".equals(pageContext.getParameter(EVENT_PARAM)))
2	messageLovInput	if (pageContext.isLovEvent())               {              String lovInputSourceId = pageContext.getLovInputSourceId();        //checking which lov event is fired.        //Below countryID is the ID of messageLovInput           if ("countryID".equals(lovInputSourceId))               {                 //Invokes AM Method                    OAMessageLovInputBean countryIDBean = (OAMessageLovInputBean)webBean.findIndexedChildRecursive("countryID");                  String countryID = countryIDBean.getText(pageContext);                  System.out.println("Country ID Value-->"+ countryID);              } }
3	messageChoice	Here  requestTypeAction   is the action event name mentioned on the item in client Action (Action Type) if("requestTypeAction".equals(pageContext.getParameter(EVENT_PARAM)))
4	link(Hyperlink)	Here  requestTypeAction   is the action event name mentioned on the item in client Action (Action Type) if("requestTypeAction".equals(pageContext.getParameter(EVENT_PARAM)))
5	Passing Parameters From One Page To Another	if(pageContext.getParameter("submit1")!=null)            {                  HashMap hmap = new HashMap();               OAMessageStyledTextBean headerBean = (OAMessageStyledTextBean)webBean.findIndexedChildRecursive("headerID");               String reqHeaderID = headerBean.getText(pageContext);               hmap.put("p_headerID", reqHeaderID);               hmap.put("p_submit_msg","Y") ;                pageContext.setForwardURL(                      "OA.jsp?page=/xxcus/oracle/apps/fnd/ear/webui/EmpCreateUpdateReqPG",                      null,                                                  OAWebBeanConstants.KEEP_MENU_CONTEXT,                                                                          null,                                                                         hmap,                                                  true,                      OAWebBeanConstants.ADD_BREAD_CRUMB_NO,                      OAWebBeanConstants.IGNORE_MESSAGES);                          }

Method :   oapagecontext.getParameter("event"); returns the current event name