formvalidation/src/js/validator/lessThan.js

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

/**
 * lessThan validator
 *
 * @link        http://formvalidation.io/validators/lessThan/
 * @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': {
            lessThan: {
                'default': 'Please enter a value less than or equal to %s',
                notInclusive: 'Please enter a value less than %s'
            }
        }
    });

    FormValidation.Validator.lessThan = {
        html5Attributes: {
            message: 'message',
            value: 'value',
            inclusive: 'inclusive'
        },

        enableByHtml5: function($field) {
            var type = $field.attr('type'),
                max  = $field.attr('max');
            if (max && type !== 'date') {
                return {
                    value: max
                };
            }

            return false;
        },

        /**
         * Return true if the input value is less than or equal to given number
         *
         * @param {FormValidation.Base} validator The validator plugin instance
         * @param {jQuery} $field Field element
         * @param {Object} options Can consist of the following keys:
         * - value: The number used to compare to. It can be
         *      - A number
         *      - Name of field which its value defines the number
         *      - Name of callback function that returns the number
         *      - A callback function that returns the number
         *
         * - inclusive [optional]: Can be true or false. Default is true
         * - message: The invalid message
         * @returns {Boolean|Object}
         */
        validate: function(validator, $field, options) {
            var value = validator.getFieldValue($field, 'lessThan');
            if (value === '') {
                return true;
            }
            
			value = this._format(value);
            if (!$.isNumeric(value)) {
                return false;
            }

            var locale         = validator.getLocale(),
                compareTo      = $.isNumeric(options.value) ? options.value : validator.getDynamicOption($field, options.value),
                compareToValue = this._format(compareTo);

            value = parseFloat(value);
            return (options.inclusive === true || options.inclusive === undefined)
                    ? {
                        valid: value <= compareToValue,
                        message: FormValidation.Helper.format(options.message || FormValidation.I18n[locale].lessThan['default'], compareTo)
                    }
                    : {
                        valid: value < compareToValue,
                        message: FormValidation.Helper.format(options.message || FormValidation.I18n[locale].lessThan.notInclusive, compareTo)
                    };
        },

        _format: function(value) {
            return (value + '').replace(',', '.');
        }
    };
}(jQuery));