Counting Characters and Alerting when close to limit



I've created a variable in the hierarchy view called myAlert2

I have added this code to the change event of yellowDescription:

if(yellowDescription.rawValue.toString().length > 1050 && myAlert2 == "NOT"){

 "You may enter about 50 more characters in the Description field.");;




     myAlert2 = "DONE";


This code works, but will provide a messageBox on each keystroke after the condition is met.  I would like to have the alert only come up once. 

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