Change font color based on text entered

[Sherbertemc]

Hello, 

I am creating a form where I have text fields that I want the text color to change when the number entered is > 9, = 10 or more and <20. I have tried other scripts shown in the help forum but those didn't work see below

if(event.value <= 9){
event.target.textColor = color.black;}
else if (event.value == 10){
event.target.textColor = color.yellow;}
else if(event.value >= 11){
event.target.textColor = color.red;}

[John T Smith]

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[Sherbertemc]

Adobe Acrobat DC