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JavaScript alphanumeric validation

 
Rinkit Shah
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I want to validate a login field such that it is mandatory for the user to enter both numbers as well as alphabets can anyone give a hint on this.
Thanks in advance.
 
Bear Bibeault
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Where's your code so far? What problems are you having with it?
 
Rinkit Shah
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Thanks Bear next time I will take care of putting my comments in relevant forum.

I have made validation

frmvalidator.addValidation("loginName","req","Please enter your Login Name");
frmvalidator.addValidation("loginName","maxlen=20", "Max length for Login Name is 20");

same I can include as alnum instead of req field for accepting only alphanumeric characters but it is not working properly so needed some guidance on this.
 
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