Send checkNumber message You click the Enter button and its Send Message behavior sends the following sendAllSprites message to the Display Field sprite:
sendAllSprites(#checkNumber)
Check the text The Display Field sprite's Check Number behavior checks the entered text for several error conditions in the following if...then statement:
set errorFound to #none
if testString contains " " then
set errorFound to #spaces
else
if length(testString) > 5 then
set errorFound to #tooLong
else
if length(testString) < 5 then
set errorFound to #tooShort
else
if voidP(value(testString)) then
set errorFound to #notNumber
end if
end if
end if
end if
Display an error alert The case statement displays an error alert, depending on the error conditions found in the if...then statement that sets the symbol in errorFound.
case errorFound of
#none: alert "This is a valid zip code."
#spaces: alert "A zip code can not contain spaces."
#tooLong: alert "A zip code can't have more than 5 digits."
#tooShort: alert "A zip code can't have less than 5 digits."
#notNumber: alert "A zip code contains only numbers"
end case
