Populating other fields in a form based on the selection in a combobox field

Question

We have done a form(masterdetail) in which we have a combobox field.When we make a selection in the field we require some two other fields to be automatically populated retrieving data from a table(which has the details required) based on the selection made.For eg. Selecting emp id(combobox) should populate empname and salary automatically in the form.Is this possible?If so how can this be done?
Thanks & Regards,
Jayanthi.S

Answer 1

This is what I did following Michael's suggestion and it works fine :-
1> Created a dynamic LOV named LOV_EMPNO as:-
select empno,empno from scott.emp
2> Started creating a form named FORM024_EMP2 on scott.emp.
3> On reaching the Formatting and Validation section, I chose the EMPNO field in the left frame.
In the right frame for EMPNO, I changed the item-type to Combobox and selected the lov LOV_EMPNO.
Then I went to the Javascript handler section for EMPNO, chose the Javascript event onChange and in the
adjacent Textarea, I wrote:-
popdetails(this);
We will create the javascript function popdetails() in the Additional pl/sql section.
4> Click next and goto the Additional PL/SQL section and I wrote the following code in
"...after displaying the page" area.
(You can write this either in
before displaying the page,
before displaying the form,
after displaying the form,
after displaying the page).
declare
type tvcarr is table of varchar2(2000) index by binary_integer;
l_empno_arr tvcarr;
l_ename_arr tvcarr;
l_sal_arr tvcarr;
begin
select empno,ename,sal
bulk collect into
l_empno_arr,l_ename_arr,l_sal_arr
from scott.emp;
htp.p('
<script>
var empdets = new Array();
empdets[0] = new Array("","");
for i in 1..l_empno_arr.count
loop
htp.p('empdets['||l_empno_arr(i)||'] = new Array("'||l_ename_arr(i)||'","'||l_sal_arr(i)||'");');
end loop;
htp.p('
function popdetails(ele)
var val = new Number();
var thisform = ele.form;
val = parseInt(ele.value);
if (isNaN(val))
val = 0;
for (var i = 0; i < thisform.length; i++){
if (thisform.name == "FORM024_EMP2.DEFAULT.ENAME.01")
thisform[i].value = empdets[val][0];
else if(thisform[i].name == "FORM024_EMP2.DEFAULT.SAL.01")
thisform[i].value = empdets[val][1];
htp.p('</script>');
end;