Using Prompt To Validate A Text String?

Jan 30, 2011

I want to prompt a user to enter their name, if the user entry includes numbers I would like to prompt them to re-enter their name using only text.

I have tried:

var userName = prompt ("Please enter your name", " ");
if (userName == null || !isNaN(userName)) {
prompt ("Please enter a valid name, and do not include any numbers in this field");
userNamm.focus();
} else {
document.write("Welcome back " +userName); }

It isn't working, I would like to monitor the user entry for only text values

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