Custom CSV download with an AJAX Callback

You can find custom CSV download steps below. (Without submit)

The button to download.


Ajax Callback process in the page.

(Type Ajax Callback) Process body is ;

begin
htp.p('Content-type: text/csv');
htp.p('Content-disposition: attachment;filename=ledger.csv');
owa_util.http_header_close;

htp.p('"Emp No","Emp Name"');

for i in (
select empno, ename
  from emp)
    loop
      htp.p('"'||i.empno||'","'||i.ename||'"');
    end loop;
end;

Apex - Change a Button to a Link

Firstly, You need a copy "text" button template as "link".

And then you can use your new template on a button. 

Creation of JSON object with APEX_JSON package

BEGIN
    APEX_JSON.initialize_clob_output;
    apex_json.open_object;        -- {
    apex_json.write('a', 1);    --   "a":1
    apex_json.open_array('b');  --  ,"b":[
    apex_json.open_object;    --    {
    apex_json.write('c',2); --      "c":2
    apex_json.close_object;   --    }
    apex_json.write('hello'); --   ,"hello"
    apex_json.write('world'); --   ,"world"
    apex_json.close_all;          --  ]
                          -- }
    DBMS_OUTPUT.put_line(APEX_JSON.get_clob_output);
    APEX_JSON.free_output;                     
END; 

Email validation for Apex

You can use below regexp expression for email validation in your apex applications.

^[A-Za-z_-]+[A-Za-z0-9._-]+@[A-Za-z0-9._-]+\.[A-Za-z]{2,4}$

Oracle Apex Standart Report Download Link Problem

Problem was related with download link and 

somehow download link's checksum was missing.
When I removed "Page Item to Submit" property value, it solved.

I faced with this problem at Apex Version 5.1.3.00.05.