Javascript & 'apexir_REPORT_ID'

Question

I am trying to use the document.getElementById('apexir_REPORT_ID') or $v('apexir_REPORT_ID').
BUT I am below a JavaScript 'Novice'.
I have no JavaScript Resources to call on here.
Can you help this frustrated mainframer in this foreign land?
I created a Page 2.
In the HTML Header I entered:
<script language="JavaScript1.1"; type="text/javascript">
function getCurIRTab()
alert("Entered getCurIRTab Function");
var temp_base_report_id = document.getElementById('apexir_REPORT_ID');
// var temp_base_report_id = $v('apexir_REPORT_ID');
alert("Report ID => " || '*'+temp_base_report_id+'*' );
return temp_base_report_id;
getCurIRTab();
</script>
I created a IR Region
I created a Page Item P2_FLOW_ID which I successfully populated with the substitution string 'APP_ID'.
I created a Page Item P2_PAGE_ID which I successfully populated with the substitution string 'APP_PAGE_ID'.
I created a Page Item P2_SESSION_ID which I successfully populated with the substitution string 'APP_SESSION'.
I created a Page Item P2_BASE_REPORT_ID which I am trying to populate.
In the HTML Form Element Attributes I entered: onsubmit="getCurIRTab()"
On the IR report I have the:
'Working Report' (default) report with multiple conditions
'Saved Report 1' report with multiple conditions
'Saved Report 2' report with multiple conditions
I a currently viewing 'Report 1'.
- I see my alerts
- Via FireBug I do not recieve any error codes on the JavaScript,
- But I also do not get anything populating the temp_base_report_id text field
What am I doing wrong?
Dan

Answer 1

Thanks,
Your explanations are great and the example works.
But I need help with one more step.
What I was originally trying to do was pass the returned value to a called procedure.
I tried populating a Page item P2_BASE_REPORT_ID by placing in the HTML Form Element Attribute:
onload="getCurIRRptID"
per the Oracle® Application Express Application Builder User’s Guide Release 3.1.2.
but the javascript did not execute.
Per your instruction I placed this in the Region Footer of the Interactive Report:
<script type="text/javascript">
getCurIRRptID();
</script>
and the alerts return the expected results.
But I want to pass this returned value to a called procedure.
So my question now is
'How do I get that returned value into a item I can pass to the procedure?'
My Page process below.
declare
rc1 number(3) :=0;
begin
BUILD_REPROCESS_STAT_FILE(:P2_PAGE_ID,:P2_SESSION_ID,:P2_BASE_REPORT_ID,:P2_USER_ID,RC1,:P2_RTN_MSG);
:P2_RETURN_CODE := TO_CHAR(rc1,'999');
end;
Thanks for all your help.
Dan