Try with the following code:

Declare
b_blob blob;
p_cod_input varchar2(50) := 'INLP';
n_len number;
BEGIN
cpl_load.xlsx_builder_Pkg.clear_workbook;
--
cpl_load.xlsx_builder_pkg.new_sheet ('test');
cpl_load.xlsx_builder_pkg.query2sheet (p_sql => 'select * from emp', p_sheet => 1);

b_blob := cpl_load.xlsx_builder_pkg.finish;

n_len := dbms_lob.getlength(b_blob);
htp.flush;
htp.init;

owa_util.mime_header('application/vnd.openxmlformats-officedocument.spreadsheetml.sheet', false);
htp.p('Content-length: '||n_len);
htp.p('Content-Disposition: attachment; filename="abc.xlsx"');
htp.p('Set-Cookie: filedownload=true; path=/');

owa_util.http_header_close;

WPG_DOCLOAD.DOWNLOAD_FILE( b_blob );
END;

This is great 👍. So finally it can be called as:

$('input').each(function(){
    if ($.isNumeric(getNumberFromCurrency($v(this)))) {
        if (parseFloat(getNumberFromCurrency($v(this)),10) < 0) {
           $(this).css({'color':'red'})
        }
    }
}).on('blur', function() {
if ($.isNumeric(getNumberFromCurrency($v(this)))) {
        if (parseFloat(getNumberFromCurrency($v(this)),10) < 0) {
           $(this).css({'color':'red'})
        }
    }
});

To show the page under maintenace message, follow these steps:

• Create a blank page and create a region inside and give the title "Page is under maintenance.".
• Create a table app_settings as below:

Create Table app_settings (dev_mode varchar2(1) default 'N');

• Insert a row as below:

Insert into app_settings (dev_mode) values ('Y');
Commit;

• Now open your page no. 2, and in Pre-rendering > Before Header > Create a Branch to redirect to the page you created in the first step and specify the serverside condition Rows Returned and add the below query:

select 1 from app_settings where nvl(dev_mode, 'N') = 'Y'

This will do the job.