jQuery.fn.numericOnly = function () {
    return $(this).each(function () {
        $(this).find("input[type=text]").click(function () {
            $(this).keydown(function (event) {
                // Allow only backspace and delete
                if (event.keyCode == 46 || event.keyCode == 8) {
                    // let it happen, don't do anything
                }
                else {
                    // Ensure that it is a number and stop the keypress
                    if (event.keyCode < 48 || event.keyCode > 57) {
                        event.preventDefault();
                    }
                }
            });
        });
    });
}