What are the type of triggers available in Oracle Reports ?

There are eight report triggers. Global triggers called the Report Triggers : (1) Before Parameter Form (2) After Parameter Form (3) Before Report (4) After Report (5) Between Pages Other Triggers : (1) Validation Triggers (2) Format Triggers (3) Action Triggers /*******************************/ (1) Before Parameter Form Fires before the Runtime Parameter Form is displayed. From  this trigger, you can access and change the values of parameters, PL/SQL global variables,  and report-level columns. (Note : If the Runtime Parameter Form is suppressed, this trigger still  fires. Consequently, you can use this trigger for validation of command line parameters). (2) After Parameter Form Fires after the Runtime Parameter Form is displayed.  Fromfires. Consequently, you can use this trigger for  validation of command line parameters or other data). (3) Before Report Fires before the report is executed but after queries are  parsed and data is fetched. (4) Between Pages Fires before each page of the report is formatted, except  the very first page. This trigger can be used for customized page formatting. (Note : In the  Previewer, this trigger only fires the first time that you go to a page. If you subsequently return to the page,  the trigger does not fire again.) (5) After Report Fires after you exit the Previewer, or after report output  is sent to a specified destination, such as a file, a printer, or an Oracle*Mail userid. This  trigger can be used to clean up any initial processing that was done, such as deleting tables. Note, however, that  this trigger always fires, whether or not your report completed successfully. (6) Validation Triggers Validation Triggers are PL/SQL functions that are executed  when parameter values are specified on the command line and when you accept the  Runtime Parameter Form. (Notice that this means each Validation Trigger may fire twice when you  execute the report). Validation Triggers are also used to validate the Initial Value of the parameter in  the Parameter property sheet. (7) Format Triggers Format Triggers are PL/SQL functions executed before the  object is formatted. The trigger can be used to dynamically change the formatting attributes of  the object. (8) Action Triggers Action Triggers are PL/SQL procedures executed when a  button is selected in the Previewer. The trigger can be used to dynamically call another report  (drill down) or execute any other PL/SQL.