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jQuery validator: focus invalid field when calling valid()
/*
 * 在validate呼叫valid()驗證方法式, 加上focusInValid的動件
 */
(function($) {
    $.extend($.fn, {
        valid2 : function() {
            var valid = true;
            var validator;
            if ($(this[0]).is('form')) {
                validator = this.validate();
                valid = this.validate().form();
            } else {
                validator = $(this[0].form).validate();
                this.each(function() {
                    valid &= validator.element(this);
                });
            }
            if (!valid)
                validator.focusInvalid();
            return valid;
        }
    });

    // 新增一個 regex 的驗證方式
    $.validator.methods.regex = function(value, element, param) {
        return this.optional(element) || ((typeof(param) == 'function' && typeof(param.test) == 'function') ? param.test(value) : new RegExp(param).test(value));
    };
    $.validator.messages.regex = 'Please enter a valid value.';
})(jQuery);