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8.6

Multiple choice selection using checkboxes

Asked by JoelM in Access Forms, Microsoft Access Database, Algorithms, Access Coding/Macros

Tags: Microsoft Access

I've got a simple Access table for a list of movies and I'd like to store "genre" information about each movie. Let's say a movie can be any one or more of a total of 16 different genres, for example, Back To The Future is an Action, Adventure, Comedy. How can I embed a multiple choice value into a single field (I certainly don't want to create 16 fields in my table to hold a yes/no value for each genre). Since the option group control in Access forms does not work with multiple choices, I thought my approach should be to build a solution in VBA.
Essentially the 16 genres would be represented by 16 checkboxes on a form, which are essentially 16 switches that can all be either on or off in any one of 2^16 or 65536 combinations. That number would be stored in an integer field in my table. Very economical! I even figured out how to write en event procedure that fires whenever one of the checkboxes is changed, so as to update the integer field that represents the combination of genres selected. What I need to do is to figure out what the genres are given an integer. For example when I move to a new record, it may have the value 45,712 in the genre field, so I need to light up the correct checkboxes on the form that correspond to that integer. So I'm looking for an algorithm in VBA that would do that. It probably uses modulo arithmetic or something.

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Multiple choice selection using checkboxes

Asked by JoelM in Access Forms, Microsoft Access Database, Algorithms, Access Coding/Macros

Tags: Microsoft Access

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