How to select One Check Box at a time

Question

Dear All
I have 10 records in details blok and also I have 10 check boxes .
I want user can only check one check box at a time .
For example If first record I have checked and i am trying to check the last record then the first record UNCHECKED and the last record will checked .
Like how redio buttons work ..
How can i do that ..?
I have done like this :-
1st I have declare a global variable in PRE_FORM :GLOBAL.CNT := 'N';
Then
WHEN-CHECKBOX-CHANGED trigger
IF CHECKBOX_CHECKED(EMP.CHK') THEN
    IF :GLOBAL.CNT != N THEN
        :EMP.CHK := Null
   HERE what to write ???
        RAISE FORM_TRIGGER_FAILURE;
    ELSE
        :GLOBAL.CNT := Y;
    END IF;
ELSE
    :GLOBAL.CNT := N;
END IF;Edited by: LuKKa on Aug 29, 2012 1:12 PM
Edited by: LuKKa on Aug 29, 2012 1:13 PM

Answer 1

LuKKa,
An easier method would be to use a Calculated Field to summarize the value of your CHECKBOX Item. For example, add a non-table item (call it SUM_CHECKED) to your detail block and do not assign it to canvas - so it will not be displayed. Then set the following properties of the SIM_CHECKED item:
Database Item = No
Calculation Mode = Summary
Summary Function = Sum
Summarized Block = <YOUR DETAIL BLOCK>
Summarized Item = <YOUR CHECKBOX ITEM>
Next, you will need to change your Detail Block property Query All Records to YES (this is required for the Calulated Item).
Now, make sure your checkbox is data type NUMBER and has the following minimum properties set:
Data Type = Number
Maximum Length = 1
Initial Value = 0
Value when Checked = 1
Value when Unchecked = 0
Check Box Mapping of Other Values = Not Allowed or Unchecked
Now, in your Checkbox Item's When-Checkbox-Changed trigger add code similar to this:
IF ( CHECKBOX_CHECKED('YOUR_DETAIL_BLOCK.YOUR_CHECKBOX_ITEM') ) THEN
   IF ( :YOUR_DETAIL_BLOCK.SUM_CHECKED > 1 ) THEN
   --Reset the checkbox
   :YOUR_DETAIL_BLOCK.YOUR_CHECKBOX_ITEM := NULL;
   MESSAGE('You can only check one item.');
   Message(' ');
   RAISE Form_Trigger_Failure;
   END IF;
END IF;I have confirmed this method works and it is more efficient than looping through your records to see if other checkboxes are checked.
Hope this helps,
Craig B-)
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