Input masking enables VIFRED to check a user's input in data entry fields on a character‑by‑character basis, as the user enters the data. If input masking is set to off, VIFRED checks the entry only when the user attempts to exit the field.

To turn on input masking, set the Inputmasking attribute to y (yes) in the Set list on the Attributes for Field frame.

In addition to turning on input masking, you must also specify an allowable input display format for the field or tablefield column. You can use only the following display formats with input masking:

For more information on display formats and input masking, see the chapter “Working with Data Types and Data Display Formats.”