Form validation in Magento

As we know that Magento use Prototype.js as javascript library. It provides a simple way to validate html form values. Below is an example:

< ?php echo $this->__('First name') ?> *




< ?php echo $this->__('Last name') ?>  *

In the form above you can see each input field has its own class name and these classes will be used to validate field’s value. There are many predefined classes like that in prototype lib. I’ll show you all of them at the end of this topic. Most important thing besides assigning class names is that little piece of JavaScript below the form. Remember to pass form id into the new VarienForm object. Basically, that’s it. Constructing the form this way, automatically makes your form reuse already existing validation code which is being used by the rest of the shop. Below is a full list of validate class and its error message that I found in prototype lib.

Validate Class	Meaning
validate-select	Please select an option.
required-entry	This is a required field.
validate-number	Please enter a valid number in this field.
validate-digits	Please use numbers only in this field. please avoid spaces or other characters such as dots or commas.
validate-alpha	Please use letters only (a-z or A-Z) in this field.
validate-code	Please use only letters (a-z), numbers (0-9) or underscore(_) in this field, first character should be a letter.
validate-alphanum	Please use only letters (a-z or A-Z) or numbers (0-9) only in this field. No spaces or other characters are allowed.
validate-street	Please use only letters (a-z or A-Z) or numbers (0-9) or spaces and # only in this field.
validate-phoneStrict	Please enter a valid phone number. For example (123) 456-7890 or 123-456-7890.
validate-phoneLax	Please enter a valid phone number. For example (123) 456-7890 or 123-456-7890.
validate-fax	Please enter a valid fax number. For example (123) 456-7890 or 123-456-7890.
validate-date	Please enter a valid date.
validate-email	Please enter a valid email address. For example johndoe@domain.com.
validate-emailSender	Please use only letters (a-z or A-Z), numbers (0-9) , underscore(_) or spaces in this field.
validate-password	Please enter 6 or more characters. Leading or trailing spaces will be ignored.
validate-admin-password	Please enter 7 or more characters. Password should contain both numeric and alphabetic characters.
validate-cpassword	Please make sure your passwords match.
validate-url	Please enter a valid URL. http:// is required
validate-clean-url	Please enter a valid URL. For example http://www.example.com or www.example.com
validate-identifier	Please enter a valid Identifier. For example example-page, example-page.html or anotherlevel/example-page
validate-xml-identifier	Please enter a valid XML-identifier. For example something_1, block5, id-4
validate-ssn	Please enter a valid social security number. For example 123-45-6789.
validate-zip	Please enter a valid zip code. For example 90602 or 90602-1234.
validate-date-au	Please use this date format: dd/mm/yyyy. For example 17/03/2006 for the 17th of March, 2006.
validate-currency-dollar	Please enter a valid $ amount. For example $100.00.
validate-one-required	Please select one of the above options.
validate-one-required-by-name	Please select one of the options.
validate-not-negative-number	Please enter a valid number in this field.
validate-state	Please select State/Province.
validate-new-password	Please enter 6 or more characters. Leading or trailing spaces will be ignored.
validate-greater-than-zero	Please enter a number greater than 0 in this field.
validate-zero-or-greater	Please enter a number 0 or greater in this field.
validate-cc-number	Please enter a valid credit card number.
validate-cc-type	Credit card number doesn\’t match credit card type
validate-cc-type-select	Card type doesn\’t match credit card number
validate-cc-exp	Incorrect credit card expiration date
validate-cc-cvn	Please enter a valid credit card verification number.
validate-data	Please use only letters (a-z or A-Z), numbers (0-9) or underscore(_) in this field, first character should be a letter.
validate-css-length	Please input a valid CSS-length. For example 100px or 77pt or 20em or .5ex or 50%
validate-length	Maximum length exceeded.

Hope this Magento tutorial helps. Reference :- http://blog.magestore.com/2010/04/09/magento-form-validation/