This is our ruby on rails  view from where called our jquery function(). 

 <td id= <%= "reject_#{event.id}" %>> 
            <%= button_tag "Accept" , :onclick => "abc('#{event.id}', 'Accept');"  %>     
            <%= button_tag "Reject" , :onclick => "abc('#{event.id}', 'Reject');"  %>     
         </td>

This is our jquery function() from where we called ajax().

abc = function(id1 , user_status){
     console.log(user_status);
     console.log(id1);
     var url; 
     if(user_status == 'accept'){
          url = "/events/" + id1 + "/accept_event/";
     }
     else {
         url = "/events/" + id1 + "/reject_event/";
     }
     console.log(url);
     $.ajax({ 
        url: url,
        beforeSend: function(xhr){xhr.setRequestHeader('X-CSRF-Token', $('meta[name="csrf-token"]').attr('content'))},
        type: "POST",
           dataType: "JSON",
            data: {'event_id': id1 },
        success: function(data){
          $("#success1").html("ACCEPTED");
          var a = 'reject_' + id1;
           $("#"+a).html(user_status);
        },
         error: function(error){
            alert(error.responseText)
         }

      });