Can a Button call a java script and then proceed with the creation

Question

Hi all,
I have a simple APEX form on a table,
with simple function as create and apply changes,
some items of the form are computed by a "Computation"
I need the create button to show the computed values, before move to the next page, then proceed with the creation ( submission)
I have tried to show the values by a java script, but after clicking the button OK of the javascript msg, no submission performed ,
details:
the java script is called in the URL of the Button,
it only contains a alert statement
is there a way to let the button do that
or may be the case could be solved by another idea!!!
rgrds,

Answer 1

Hi Varad,
It is Before header of course. I forgot to mention this.
Yes, you are right Varad, I have read again the question and seems original request was to show Computation that is done in After Submit, more javascript is required of course.
One possibility is to create On Demand process called COMPUTEITEM where you compute your item, and in the end of on demand process it prints it
htp.p(:P1_X)
Then put in HTML header of your page
<script language="JavaScript" type="text/javascript">
function setShowItemSub(pThis){
   var l_This   = $x(pThis);
   var ajaxRequest = new htmldb_Get(null, $v('pFlowId'),  'APPLICATION_PROCESS=COMPUTEITEM', $v('pFlowStepId'));
   ajaxRequest.add($x(l_This).id, $v(l_This));
   var gReturn = ajaxRequest.get();
   alert(gReturn);
   ajaxRequest = null;
  doSubmit('aa');
</script>And in Button URL textarea put:
javascript:setShowItemSub('P1_X');
Then no need in After Submit process anymore
I have put this now in http://apex6.revion.com/pls/apex/f?p=225:1
COMPUTEITEM On demand process is :
:P1_X := :P1_X || ' Added this trail';
htp.p(:P1_X);Of course, all this should be modified accordingly
Regards,
Oleg