AJAX Callback

Question

Hello everyone,
I am attempting to use the Callback feature for ApEx. I have tried to use a provided Oracle sample to just print a simple "Hello World" type of process using AJAX Callback. It appears that my code does not execute at all so I am not sure how to proceed.
The sample code that I used from Oracle is located at http://apex.oracle.com/pls/otn/f?p=11620:63:366817572353630::NO:::. For convenience, I copied the sample code below:
<script>
function f_TestOnDemand(){
var get = new htmldb_Get(null,$x('pFlowId').value,'APPLICATION_PROCESS=mytestprocess',0);
get.add('TEMPORARY_ITEM',$x('P11_TEST').value)
gReturn = get.get();
get = null;
</script>The code that I have written based on the above sample is a makeup of a Java function and an on demand process. The Java code is as follows:
<script>
function f_TestOnDemand(){
var get = new htmldb_Get(null,$x('pFlowId').value,'APPLICATION_PROCESS=mytestprocess',305);
get.add('TEMPORARY_ITEM','HELLO from Java');
gReturn = get.get();
get = null;
</script>The on demand process named "mytestprocess" is coded as follows:
begin
htp.prn ('Hello from on demand process');
htp.prn ('Hello from temporary item' || :TEMPORARY_ITEM);
end;Can someone help me to understand why I am not getting any output from this code? The ultimate goal is to alter session state via AJAX Callback but I cannot seem to get AJAX Callback to execute at all.
I am using APEX version 4.0.1 in an Oracle 11.2.0.1 database.
Edited by: ncroston on Dec 15, 2010 8:49 AM

Answer 1

get.add is kind of the old way to do it - it required you to create an application item first and then select from it. They added a new way that doesn't require an application item - If you use get.addParam('x01', value) instead, it puts the values in wwv_flow.g_x01. You can assign x01-x10 and it maps to g_x01-10 respectively.
So basically it would change to:
get.add('x01',$x('P11_TEST').value)and
htp.prn ('Hello from temporary item' || wwv_flow.g_x01);