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form validation

I have a simple form validation to see if a field is left empty or not.
But what is need is to check if a zipcode is correct based on a list or array of zipcodes.

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  1. else if(document.adres.zipcode.value == '' || document.adres.postcode2.value == ''){
  2.         alert('Zipcode is empty!');
  3.         return false;
  4.     }
So when a user types i a zipcode thats not in a list the user gets an alert.

Feb 22 '12 #1
1 845
8,651 Expert Mod 8TB
the Array object has a nice and useful method named indexOf().
Feb 22 '12 #2

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