jquery validation only digits

Question

I am having the jquery.validate.js plugin and it is working fine for me.

My question is :

I am having a textbox and this textbox is mandatory and should only

Answer 1

$("#mobile_number").validate({
            rules: {

                mobile_number: {required: true,number:true}
            },
            messages: {
                mobile_number: {required: "Please Enter Your Mobile Number",number:"Please enter numbers Only"}
            }

 });