How can we specify rules for jquery validation plugin by class?

Question

The jQuery Validation plugin works great and is very easy to use:

$(\".selector\").validate({
})

Just by setting css classes like \"require

Answer 1

Before this you have to include Query file

$("#myform_name").validate({
    onfocusout: function(element) { $(element).valid(); } ,
    rules:{
       myfield_name: {
          required:true
       },
       onkeyup: false,
       messages: {
          myoffer: "May not be empty"
       }
    }
});