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How to validate sum of fields (access 2003)
Hi,
I'm running a query in order to find records that have at least one match, based on a form - where I select a certain record - and a subform - where the matching records are displayed. The search is based on four parameters (located in the main form), which are scored from 0 to 1 (passing through 0,25, 0,5 and 0,75). The results that appear in the subform are ranked and filtered according to the sum of those four criteria and corresponding scores. Now, my problem is very simple but so far I haven't found a solution that works: I want to validate the sum of those four criteria scores so that it doesn't exceed the maximum possible score (=1); in case this condition isn't met, the query shouldn't be updated. I've tried putting this piece of code in the (main/sub) form's properties (namely, in the before/after update event) but it isn't working: If Score1 + Score2 + Score3 + Score4 1 Then MsgBox "Verify sum" Cancel = True Me.Undo End If Thanks in advance, Paula |
#2
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How to validate sum of fields (access 2003)
Your code allows only for the result being exactly 1. Less or more than 1
generates the error message. The expression should be, as I understand the situation: If Score1 + Score2 + Score3 + Score4 = 1 Then etc. The validation code needs to be in the form's Before Update event. After Update runs after the values have been written to the table. They are two different events. By using Me.Undo you are wiping out the entire record and forcing the user to start over from the beginning. Don't you want to allow the user to go back and fix the data in the Score fields? Paula wrote: Hi, I'm running a query in order to find records that have at least one match, based on a form - where I select a certain record - and a subform - where the matching records are displayed. The search is based on four parameters (located in the main form), which are scored from 0 to 1 (passing through 0,25, 0,5 and 0,75). The results that appear in the subform are ranked and filtered according to the sum of those four criteria and corresponding scores. Now, my problem is very simple but so far I haven't found a solution that works: I want to validate the sum of those four criteria scores so that it doesn't exceed the maximum possible score (=1); in case this condition isn't met, the query shouldn't be updated. I've tried putting this piece of code in the (main/sub) form's properties (namely, in the before/after update event) but it isn't working: If Score1 + Score2 + Score3 + Score4 1 Then MsgBox "Verify sum" Cancel = True Me.Undo End If Thanks in advance, Paula -- Message posted via AccessMonster.com http://www.accessmonster.com/Uwe/For...forms/201004/1 |
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