In this example only text is displayed on the progress bar.
The following is an example of how to use the PL/SQL API inside a page process :

declare
    l_processname varchar2(128 char) := 'PROCESS_01';
begin

    UC_PROGRESSBAR_PKG.start_process(p_process_name => l_processname,
                                     p_maxval => 100,
                                     p_process_text => 'Starting');

    for i in 1..5
    loop
      if i = 1
      then
          UC_PROGRESSBAR_PKG.set_status(p_process_name => l_processname,
                                        p_value => i*20,
                                        p_process_text => 'Making backup');
      elsif i = 2
      then
          UC_PROGRESSBAR_PKG.set_status(p_process_name => l_processname,
                                        p_value => i*20,
                                        p_process_text => 'Getting data');
      elsif i = 3
      then
          UC_PROGRESSBAR_PKG.set_status(p_process_name => l_processname,
                                        p_value => i*20,
                                        p_process_text => 'Processing');                                
      elsif i = 4
      then
          UC_PROGRESSBAR_PKG.set_status(p_process_name => l_processname,
                                        p_value => i*20,
                                        p_process_text => 'Finishing');           
      elsif i = 5
      then
          UC_PROGRESSBAR_PKG.set_status(p_process_name => l_processname,
                                        p_value => i*20,
                                        p_process_text => 'Clean up');                                         
      sys.DBMS_SESSION.sleep(2);
      end if;
    end loop;

    UC_PROGRESSBAR_PKG.stop_process(p_process_name => l_processname);
end;

Text options for the plug-in are set inside "JavaScript Initialization Code". With the "textTemplate" style option text otput template can be defined to display only text messages.

 function( pOptions ) {
     
    pOptions.style.textTemplate = "%2";
    pOptions.style.completeText = "Completed!";
     
    return pOptions;
}