jQuery remote validation on create vs update

I have a Laravel 5.4 backend with validation rules all set up and working fine.

I also implemented the jQuery Validation plugin for client side validation for a better experience and used it successfully to test the remote validation.

So for example checking for a unique email address when adding an entity:

$("#customerForm").validate({
rules: {
    name: "required",
    email: {
        required: true,
        email: true,
        remote: {
            url: "/api/admin/customers/checkuniqueemail",
            type: "post",
            async: false,
            complete: function(data) {
                if (data.responseText == "true") { //i.e. email is unique
                    // show some feedback
                } 
            }
        }
    }
},
messages: {
    email: {
        remote: 'The email has already been taken.'
    }
}

});

This works perfectly.

Questions:

1. The above example works great when I'm adding a new entity. I would also like to validate on Updates but in that case it should exclude the current entity when checking for a unique email. This would mean I need to pass the primary key of the current entity along as well. Is my approach correct, and would the "data" attribute be the recommended approach?

2. Is there a way I can access the "action" attribute of the current form and send it along as a "data" variable.

The reason I ask is that the within the Laravel "Edit" form, the entity id is part of the action url (e.g. /customers/edit/1234) and not really within a hidden field. So if I can get ahold of the "action" and send its value along, I can extract the ID and check for uniqueness except for that entity. I'm using Route Model binding in case it's relevant

Thanks!

With jquery validate, you can use it much like the jquery ajax options. With that said, you can specify the data property. This property can take a static value or a function to return a dynamic value (the action attribute of the form you are submitting in your case)

data: {'customer_id':function(){ return $('#customerForm').attr("action") } }