Magento form validation

I often found myself looking on the net for the right classes to validate forms using the Prototype library that comes with Magento and finally decided to write a small post about validations.

Using these validations is as easy as using the following classes to the form fields in your forms.

'validate-no-html-tags' => 'HTML tags are not allowed'
'validate-select' => 'Please select an option.'
'required-entry' => 'This is a required field.'
'validate-number' => 'Please enter a valid number in this field.'
'validate-number-range' => 'The value is not within the specified range.'
'validate-digits' => 'Please use numbers only in this field. Please avoid spaces or other characters such as dots or commas.'
'validate-digits-range' => 'The value is not within the specified range.'
'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-alphanum-with-spaces' => 'Please use only letters (a-z or A-Z), numbers (0-9) or spaces only in this field.'
'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-date-range' => 'The From Date value should be less than or equal to the To Date value.'
'validate-email' => 'Please enter a valid email address. For example johndoe@domain.com.'
'validate-emailSender' => 'Please use only visible characters and spaces.'
'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-both-passwords' => 'Please make sure your passwords match.'
'validate-url' => 'Please enter a valid URL. Protocol is required (http://, https:// or ftp://)'
'validate-clean-url' => 'Please enter a valid URL. For example http://www.example.com or www.example.com'
'validate-identifier' => 'Please enter a valid URL Key. 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-zip-international' => 'Please enter a valid zip code.'
'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 number 0 or greater in this field.'
'validate-zero-or-greater' => 'Please enter a number 0 or greater in this field.'
'validate-greater-than-zero' => 'Please enter a number greater than 0 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-cc-number' => 'Please enter a valid credit card number.'
'validate-cc-type' => 'Credit card number does not match credit card type.'
'validate-cc-type-select' => 'Card type does not match credit card number.'
'validate-cc-exp' => 'Incorrect credit card expiration date.'
'validate-cc-cvn' => 'Please enter a valid credit card verification number.'
'validate-ajax' => ''
'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' => 'Text length does not satisfy specified text range.'
'validate-percents' => 'Please enter a number lower than 100.'
'validate-cc-ukss' => 'Please enter issue number or start date for switch/solo card type.'

Here an example of how to use the validations when adding a field to a fieldset:

$fieldset->addField('title', 'text', array(

          'label'     => Mage::helper('form')->__('Title3'),

          'class'     => 'required-entryvalidate-alphanum',

          'required'  => true,

          'name'      => 'title',

          'onclick' => "alert('on click');",

          'onchange' => "alert('on change');",

          'style'   => "border:10px",

          'value'  => 'hello !!',

          'disabled' => false,

          'readonly' => true,

          'after_element_html' => '<small>Comments</small>',

          'tabindex' => 1

        ));