# VTypes.js

    /**
     * @class Ext.form.VTypes
     * This is a singleton object which contains a set of commonly used field validation functions.
     * The validations provided are basic and intended to be easily customizable and extended. To add
     * your own custom VType:<pre><code>
    Ext.apply(Ext.form.VTypes, {
        IPAddress:  function(v) {
            return /^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$/.test(v);
        },
        IPAddressText: 'Must be a numeric IP address'
    });
    </code></pre>
     * @singleton
     */
    Ext.form.VTypes = function(){
        // closure these in so they are only created once.
        var alpha = /^[a-zA-Z_]+$/;
        var alphanum = /^[a-zA-Z0-9_]+$/;
        var email = /^(\w+)([-+.][\w]+)*@(\w[-\w]*\.){1,5}([A-Za-z]){2,4}$/;
        var url = /(((https?)|(ftp)):\/\/([\-\w]+\.)+\w{2,3}(\/[%\-\w]+(\.\w{2,})?)*(([\w\-\.\?\\\/+@&#;`~=%!]*)(\.\w{2,})?)*\/?)/i;

        // All these messages and functions are configurable
        return {
            /**
             * The function used to validate email addresses.  Note that this is a very basic validation -- complete
             * validation per the email RFC specifications is very complex and beyond the scope of this class, although
             * this function can be overridden if a more comprehensive validation scheme is desired.  See the validation
             * section of the <a href="http://en.wikipedia.org/wiki/E-mail_address">Wikipedia article on email addresses</a>
             * for additional information.
             * @param {String} value The email address
             */
            'email' : function(v){
                return email.test(v);
            },
            /**
             * The error text to display when the email validation function returns false
             * @type String
             */
            'emailText' : 'This field should be an e-mail address in the format "user@domain.com"',
            /**
             * The keystroke filter mask to be applied on email input.  See the {@link #email} method for
             * information about more complex email validation.
             * @type RegExp
             */
            'emailMask' : /[a-z0-9_\.\-@]/i,

            /**
             * The function used to validate URLs
             * @param {String} value The URL
             */
            'url' : function(v){
                return url.test(v);
            },
            /**
             * The error text to display when the url validation function returns false
             * @type String
             */
            'urlText' : 'This field should be a URL in the format "http:/'+'/www.domain.com"',

            /**
             * The function used to validate alpha values
             * @param {String} value The value
             */
            'alpha' : function(v){
                return alpha.test(v);
            },
            /**
             * The error text to display when the alpha validation function returns false
             * @type String
             */
            'alphaText' : 'This field should only contain letters and _',
            /**
             * The keystroke filter mask to be applied on alpha input
             * @type RegExp
             */
            'alphaMask' : /[a-z_]/i,

            /**
             * The function used to validate alphanumeric values
             * @param {String} value The value
             */
            'alphanum' : function(v){
                return alphanum.test(v);
            },
            /**
             * The error text to display when the alphanumeric validation function returns false
             * @type String
             */
            'alphanumText' : 'This field should only contain letters, numbers and _',
            /**
             * The keystroke filter mask to be applied on alphanumeric input
             * @type RegExp
             */
            'alphanumMask' : /[a-z0-9_]/i
        };
    }();

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