Checked box validation

Question

Hi All,
I am using oracle Forms 10G on windows.
I need help on how to validate that only one check box is checked in detail block. I have multiple records in the detail block and I have check boxes for each record in the detail block.
I have a button to select the values from the detail records where the check box is checked. But I want to make sure that only one record is check not more than one.
And How to move the cursor to the checked record if the focus or cursor is in an unchecked record.
Thanks,

Answer 1

One way would be to create a forms level variable (Global, Parameter item, Forms Package Specificaiton, etc) to record the record number of a checked record. Each time a user clicks a check box, you would check your variable to see if it is greater than 0. If its greater than zero then you know the user has already checked a check box and you know which record needs to be unchecked. Another option would be to just pop a message to the user to uncheck any checked records. I like the first option because it is more user friendly. Here is a code sample. I like using Forms Package spec variables because of they have a smaller memory footprint, but you can use a Block item, Parameter, Global, etc to record the record variable.
/* Sample When-Checkbox-Changed trigger */
DECLARE
   n_curr_record   NUMBER := 0;
BEGIN
   IF ( Forms_Var.checked_record > 0 ) THEN
      n_curr_record := :system.trigger_record;
      /* Forms_VAR is a Forms Program Unit Package Specification */
      Go_Record(Forms_VAR.Checked_Record);
      :YOUR_BLOCK.YOUR_CHECKBOX_ITEM := 0;
      /* Assumes you are using 0 = unchecked and 1 = checked */
      Go_Record(n_curr_record);
      /* return to the current record */
   END IF;
END;Hope this helps,
Craig B-)
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