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It is probably best to use a numeric field rather than a text field if you only want numbers but either way you can put in the exit event of the field (in formcalc):
if ($ < 3) then
xfa.host.messageBox("The value cannot be less than 3")
It is probably best to use a numeric field rather than a text field if you only want numbers but either way you can put in the exit event of the field (in formcalc):
if ($ < 3) then
xfa.host.messageBox("The value cannot be less than 3")