How to show valid field items based on previous selected field

Question

I am trying to use BC Web Apps to help my customers find products for their specific motor vehicle.
By selecting the vehicle make and then the model. e.g. Chevrolet and then Camaro.
This will then bring up a table with all the cosponsoring equipment part numbers.
At the moment the closest I can get is two dropdown lists one with all the vehicle makes and another with every vehicle model.
If I select Chevrolet I only want to see Chevrolet models in the dropdown list.

Answer 1

Hi 2932464,
2932464 wrote:
Hi,
I have a set of text Field items in oracle apex:
Order Number
Revision Number
When we open the report, revision should be hidden.
Only when the user enters unique order number (non-duplicate order numbers), revision number should be visible.
If he enters duplicate order number, revision number should be hidden.
Please help.
Giving you example how to achieve this.
Step 1. Create three Page Items
    1) P1_ORDER_NO - Text Field
    2) P1_REVISION_NO - Text Field
    3) P1_ENABLE_DISABLE_REVNO  - Hidden,Value Protected - No
2. Create 3 Dynamic Actions
1) Disable revision number on page load
    Event - Page Load
    Action - Disable
    Fire When Event Result Is  - True
    Selection Type - Item
    Item - P1_REVISION_NO
  2) Check duplicate order number
    Event - Change
    Selection Type - Item(s)
    Item(s) - P1_ORDER_NO
    Condition - is not null
    Action - Execute PL/SQL Code
    Generate opposite false action - Unchecked
    Fire When Event Result Is  - True
    Fire on page load - Unchecked
    Stop Execution On Error - Checked
    Wait for Result - Checked
    PL/SQL Code -
declare
l_count number;
begin
  select count(*) into l_count
    from emp
   where empno = :P1_ORDER_NO;
if l_count > 0 then
  :P1_ENABLE_DISABLE_REVNO := 1;
else
  :P1_ENABLE_DISABLE_REVNO := 0;
end if;
end;
Page Items to Submit = P1_ORDER_NO
Page Items to Return  = P1_ENABLE_DISABLE_REVNO
3 ) Enable and Disable Revision Number
    Event - Change
    Selection Type - Item(s)
    Item(s) - P1_ENABLE_DISABLE_REVNO
   condition - greater than or equal to
   value  - 1
   Action - Disable
   Fire on Page Laod - Unchecked
   Generate opposite false action - checked
   Selection Type = Item(s)
   Item(s) - P1_REVISION_NO
Hope this helps you,
Regards,
Jitendra
DER_NO