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Use the isNaN ( ) function in validateForm ( ) to verify the user id is a number. Display Invalid user id in the
Use the isNaN function in validateForm to verify the user id is a number. Display "Invalid user id in the console log if the user id is not a number. Use the event method preventDefault to avoid submitting the form when the input is invalid.
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DNA Databases
Authors: Stefan Kiesbye
1st Edition
0737758910, 978-0737758917
