Brian Dunning's FileMaker Custom Functions

ListToggle ( InList ; InValue )

Adds or removes given Value from given List

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Richard DeShong   Richard DeShong - Show more from this author
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  Sample input:
ListToggle ( "A¶B¶C", "B" )
  Sample output:

  Function definition: (Copy & paste into FileMaker's Edit Custom Function window)

Add or Remove a given value from the list.
Note that this does not clean up the list.
I typically use this for UI selection and conditional formatting.

Adapted from ideas by David Head and Bruce Robertson and their AddRemoveListItem(s) functions. The main change was to put the Let() statement inside the Case() statement. I think this makes the function more efficient when it is likely that the list is empty.

~~~ Design Notes ~~~

This is part of a series of LIST functions.
ListAdd, ListAddUnique, ListExist, ListGet, ListToggle.
Each uses the same name format: List
Each uses the same parameter format: InList; InValue.

They also work in concert with two SET functions:
SetVar and SetField
These are all designed to work with variables and to
keep the variables from being un-set (removed from memory),
by using the string "Empty" to indicate IsEmpty().
If a field, MyField, is empty and I use SetVar(),
MyVariable = SetVar( MyField )
Tnen MyVariable is now = "Empty"




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Note: these functions are not guaranteed or supported by Please contact the individual developer with any questions or problems.

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