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Scale masks are used to filter the scale lists of grid questions. Use the Scale mask field on the Script tab of a grid question's Details page to enter a JScript or JavaScript expression that evaluates to a set of codes. The scale list will then be filtered based on this set of codes.
Important
It is not recommended to use triggers to re-mask the current/same question. If the grid is masked on itself using a trigger, then any data entered in the masked answer may not be saved.