Not Allowing a Value to be Selected in a Select List

Version 4.1.1.00.23
Hello,
I've created a Select List to display Projects within a Department (we call them Groups).
A Group will have Projects, however, more than one Group can have a Project with the same name.
So my query for the Select List displays the data in a Hierarchical format like this:
Group 1
    Proj Grp 1
    Proj Grp 1
    Proj Grp 1
    Proj Grp 1
    Proj Grp 3
Group 2
    Proj Grp 1
    Proj Grp 1
    Proj Grp 2
    Proj Grp 2
Group 3
    Proj Grp 1
    Proj Grp 2
    Proj Grp 3
What I'm looking for is to NOT allow the 'Group' level to be selected within the list. Only allow the Project level values to be selected.
The query is:
WITH t
     AS (SELECT 'Group: ' || vg.group_name name
               ,vg.group_id
               ,NULL id
               ,1 AS weight
         FROM   vertical_group vg
         WHERE (vg.group_id = :P100_GROUP OR :P100_GROUP = 0)
         UNION ALL
         SELECT '....' || project_name
               ,group_id
               ,project_id
               ,2 AS weight
         FROM   tbs_projects
         WHERE status IN ('Pipeline'
                          ,'Planned - Partially Funded'
                          ,'Planned'
                          ,'Execution') AND
                ( :P100_RYG_PROJECT = 0 OR :P100_RYG_PROJECT = ryg_proj_id ) AND
                ( group_id = :P100_GROUP OR :P100_GROUP = 0 ))
SELECT name
      ,id
FROM   t
ORDER BY group_id
        ,weight
        ,name
Can someone help me with this?
Is there additional information I can provide?
Thanks,
Joe

The HTML optgroup element is used to structure select lists in this way. Standard APEX Select Lists and LOVs do not have support for generating optgroup elements in option lists, but item plug-ins with this feature are available.
See the documentation for more on using plug-ins.

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I have a page item which is a select list. I have a button in my region which when clicked will call a process. This process takes the current value of my page item as a parameter. However, when I select a value from the Select list and click on the button, the page item is still submitting the earlier value, it is not getting updated with the value I selected in the select list. Can someone tell me how I can get the page item value to be updated with the value I selected from the choice list? I tried calling a javascript function from the element attribute of this select list onchange="javascript:setValue(this);") and was trying to set the value of another hidden page item with the value of this select list but then the function is not getting called as well. My function code is something like
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970829 wrote:
I have a page item which is a select list. I have a button in my region which when clicked will call a process. This process takes the current value of my page item as a parameter. However, when I select a value from the Select list and click on the button, the page item is still submitting the earlier value, it is not getting updated with the value I selected in the select list.
How do you know this? Have you used Debug mode to track what is happening when the button is pressed? This will show any changes to item values in session state during page submit and page show processing.
Can someone tell me how I can get the page item value to be updated with the value I selected from the choice list?
This should happen automatically with a select list item, if the button is correctly defined to perform a page submit. It will not happen if the button performs a redirect. What action is defined to occur when the button is pressed?
I tried calling a javascript function from the element attribute of this select list onchange="javascript:setValue(this);") and was trying to set the value of another hidden page item with the value of this select list but then the function is not getting called as well. My function code is something like
function setValue(pThis)
for (var i = 0; i < pThis.options.length; i++) {
if (pThis.options[ i ].selected){
result= pThis.options;
html_GetElement('P2_HIDDEN').value = result;
P2_HIDDEN is my hidden page item
As detailed above, this should be completely unnecessary, however as an aside, html_GetElement is a very out of date method of accessing an item. What version of APEX are you using? (Always specify which version you're using when you ask a question, to allow us to determine the most appropriate solution to the problem.)

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Not Allowing a Value to be Selected in a Select List

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