jQuery('.add_to_cart_button').click(function(e){
    e.preventDefault();

    var product_id = $(this).attr('data-product_id');

    $.post(ajaxhandle,{'action':'add_foobar','product_id':product_id},function(response){

        if(response==0){
        console.log('error');   
        }
      else{
            console.log('success');
        }
    });

});