Language Reference Guide : System Classes : EntryField Class : InputMasking Attribute
 
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InputMasking Attribute
Data Type: smallint
4GL Access: RW
The InputMasking attribute specifies whether to use a format template to control data entry in the field.
Valid values are:
TRUE
Specifies that the field accepts only data that conforms to the format template defined for the field. (The format string is specified in the FormatString Attribute.)
FALSE
Specifies that the field accepts any data of the appropriate type, regardless of its format
Input masking can occur only if there is a valid format string defined for the field and the InputMasking attribute is set to TRUE.
For a description of how to set data format templates, see the Workbench User Guide.