Functions Reference

FILEMAKER FUNCTIONS REFERENCE 154
Description
The optional fields parameter is a list of fields this calculation is dependent on. If a necessary field
isn’t listed, modifying that dependent field won’t update the result of the calculation.
Examples
Evaluate(TextField) returns 4 when TextField contains 2 + 2.
Evaluate("textfield") returns 2 + 2 when textfield contains 2 + 2.
Evaluate(GetField("textfield")) returns 4 when textfield contains 2 + 2.
Evaluate(TextField;[Amount]) returns .80 when TextField contains .08 * Amount and the
Amount field contains 10.00.
Evaluate(“Let(TaxRate=.05;“& Tax Rate Calculation &“)”) returns .50 when the
field Tax Rate Calculation contains SubTotal * TaxRate where SubTotal is a numeric field that
contains 10.00.
The following example shows how to pass named parameters using the Evaluate, Let, and
Get(ScriptParameter) functions, allowing access only to variable “a” (the example returns 6):
ScriptParameter = "a = 5; b = 10"
Evaluate("Let ( [" & Get(ScriptParameter) & "]; a + 1 )")
The following example shows how to pass named parameters, allowing access to both variable “a”
and
“b”. The simplified first parameter makes the second parameter more complex (the example
returns 6, 12):
ScriptParameter = "a = 5; b = 10"
Evaluate("Let ( [" & Get(ScriptParameter) & "]; a + 1 & \", \" & b + 2 )")
The following example shows how to pass named parameters, while keeping the ability to check the
syntax of the second parameter of the
Let function (the example returns 6, 12):
ScriptParameter = "a = 5; b = 10"
Let( [a = Evaluate("Let( [" & Get(ScriptParameter) & "]; a )"),
b = Evaluate("Let( [" & Get(ScriptParameter) & "]; b )")]; a + 1
& ", " & b + 2 )
Note The Evaluate function evaluates an expression, including field values to be evaluated as a
calculation formula. It also allows you to specify field dependencies so that a calculation using the
evaluation function can be triggered due to changes in other fields of the same record. This function
evaluates user-defined formulas. For example, you can create a formula in the Total field that
computes state tax:
Evaluate(StateTaxFormula) + ShippingCost
where the StateTaxFormula field contains:
SubTotal * 1.0875
and the SubTotal field contains the subtotal before tax and shipping.
The Evaluate function has an optional second parameter, which is a field the calculation is
dependent on. When the dependent field contents change, FileMaker
Pro re-evaluates the
calculation. In the following example, the Total calculation will be re-evaluated when SubTotal
changes:
Evaluate(StateTaxFormula; SubTotal) + ShippingCost