Ajax based report and pagination

Question

Hi I have searched through the web for ajax based report in Apex. I have found the following link as very useful. http://apex.oracle.com/pls/otn/f?p=31517:98
Here content of one page is pulled to the current page. It works fine. Pagination is also working exactly as the Apex reports. But I was thinking of something different, not pulling the content from other page. I have done it myself as follows.
1. Take an HTML region called Parameter
2. Take a select list in the parameter region with LOV query
name : P2_DEPTNO
LOV : Select dname d,deptno r
from dept
3.Take an HTML region
Source : <div id=ajx></div>
4. Create an Application Item called F103_DEPTNO
5. Create an Application Process
Name : getEmpTable
Source:
declare
v_deptno number(3);
begin
OWA_UTIL.mime_header ('text/xml', FALSE);
HTP.p ('Cache-Control: no-cache');
HTP.p ('Pragma: no-cache');
OWA_UTIL.http_header_close;
HTP.prn ('<table>');
HTP.prn ('<tr>');
htp.prn('<th>Employee Number</th>');
htp.prn('<th>Employee Name</th>');
htp.prn('<th>Salary</th>');
htp.prn('<th>Department</th>');
htp.prn('<th>Job</th>');
htp.prn('<th>Hiredate</th>');
HTP.prn ('</tr>');
foR R in (select empno,ename,sal,deptno,job,hiredate from emp where deptno= :F103_DEPTNO )
LOOP
htp.prn('<tr>');
htp.prn('<td>'||r.empno||'</td>');
htp.prn('<td>'||r.ename||'</td>');
htp.prn('<td>'||r.sal||'</td>');
htp.prn('<td>'||r.deptno||'</td>');
htp.prn('<td>'||r.job||'</td>');
htp.prn('<td>'||r.hiredate||'</td>');
htp.prn('</tr>');
END LOOP;
END IF;
HTP.prn ('</table>');
end;
6. Write a javascript Function in HTML Header
Source:
<script language = "JavaScript" type="text/javascript">
function GetEmployees()
var get = new htmldb_Get(null,&APP_ID.,'APPLICATION_PROCESS=getEmpTable',0);
get.add('F103_DEPTNO',html_GetElement('P2_DEPTNO').value);
gReturn = get.get();
document.getElementById('ajx').innerHTML = gReturn;
get = null;
</script>
7. Go to edit page item of P2_DEPTNO and in HTML Form Element Attributes write onchange="GetEmployees()"
8. Run and test.
Ajax based report works fine.
In the link specified above pagination works fine.
In my example very few records will appear but in case there are a lot of records appear then it is a must to manage it with pagination, letting only a few records to appear in each page. But in my example I have no idea how to manage pagination. Need help from the experts. Please notify..
Regards
Hasan Al Mamun
Programmer
Bangladesh Bank
Dhaka, Bangladesh
Edited by: hasan_al_mamun on Jan 19, 2011 10:58 AM
Edited by: hasan_al_mamun on Jan 19, 2011 11:20 AM
Edited by: hasan_al_mamun on Jan 19, 2011 11:24 AM

Answer 1

Hi,
You need to work with ROWNUM of result set. Create two hidden items, one for record_start_rownum and other for record_end_rownum. You need to add where clause to your SELECT query in Application process. Then your query will look like
select *
  from ( select a.*, rownum r
           from ( select empno,ename,sal,deptno,job,hiredate from emp where deptno= :F103_DEPTNO  ) a
          where rownum < :P1_ record_start_rownum )
where r > :P1_record_end_rownumYou may find following asktom link interesting..
http://asktom.oracle.com/pls/asktom/f?p=100:11:0::::P11_QUESTION_ID:76812348057
Regards,
Hari