formvalidation/src/js/validator/stringCase.js

The best jQuery plugin to validate form fields. Support Bootstrap, Foundation, Pure, SemanticUI, UIKit and custom frameworks

/**
 * stringCase validator
 *
 * @link        http://formvalidation.io/validators/stringCase/
 * @author      https://twitter.com/nghuuphuoc
 * @copyright   (c) 2013 - 2015 Nguyen Huu Phuoc
 * @license     http://formvalidation.io/license/
 */
(function($) {
    FormValidation.I18n = $.extend(true, FormValidation.I18n || {}, {
        'en_US': {
            stringCase: {
                'default': 'Please enter only lowercase characters',
                upper: 'Please enter only uppercase characters'
            }
        }
    });

    FormValidation.Validator.stringCase = {
        html5Attributes: {
            message: 'message',
            'case': 'case'
        },

        /**
         * Check if a string is a lower or upper case one
         *
         * @param {FormValidation.Base} validator The validator plugin instance
         * @param {jQuery} $field Field element
         * @param {Object} options Consist of key:
         * - message: The invalid message
         * - case: Can be 'lower' (default) or 'upper'
         * @returns {Object}
         */
        validate: function(validator, $field, options) {
            var value = validator.getFieldValue($field, 'stringCase');
            if (value === '') {
                return true;
            }

            var locale     = validator.getLocale(),
                stringCase = (options['case'] || 'lower').toLowerCase();
            return {
                valid: ('upper' === stringCase) ? value === value.toUpperCase() : value === value.toLowerCase(),
                message: options.message || (('upper' === stringCase) ? FormValidation.I18n[locale].stringCase.upper : FormValidation.I18n[locale].stringCase['default'])
            };
        }
    };
}(jQuery));