Master detail form issue retrieving service price automatically

Question

Hi,
I developed a master detail form in order to process service requests.
On details block I'm trying to retrieve automatically service price after I select service name from LOV.
For this purpose I created a application plsql process
declare
v_price service.price%type;
begin
select     price into v_price
from      service
where      service_no = 1;
htp.prn(v_price);
exception when others then htp.prn('An error occurred retrieving the PRICE');
end;
Which process I'm calling through javascript function in order to retrieve service price.
<script type="text/javascript">
function GetServicePrice(pThis)
var vRow = pThis.id.substr(pThis.id.indexOf('_')+1);
html_GetElement('f07_'+vRow).value = new htmldb_Get(null,html_GetElement('pFlowId').value,'APPLICATION_PROCESS=getPrice',0);
</script>
Instead of price it returns this value: "[object Object]".
Is it possible to work as I intended or it should other way around?
I appreciate your help/comments.
Application Express 4.2.1.00.08
Oracle Database 11g Express Edition Release 11.2.0.2.0
Regards,

Answer 1

Tonito99 wrote:
Hi Tom,
I applied these changes on page HTML Header, but now it's not returning nothing.
f07_ (price column) is empty.
<script type="text/javascript">
function GetServicePrice(pThis)
var ajaxRequest = new htmldb_Get(null, $v('pFlowId'), 'APPLICATION_PROCESS=getPrice', 0);
var ajaxReturn = ajaxRequest.get();
$s('f07_'+vRow, ajaxReturn);
</script>
Any other suggestion?
Regards,
Edited by: Tonito99 on Mar 8, 2013 3:32 PMIf you are on apex 4.2 why are you still using the legacy/undocumented methods?
You should use new javascript API apex.server.process
apex.server.process ( "getPrice", {
success: function( pData ) { $s('f07_'+vRow, pData);}
  } );