c# - How to make an Ajax Post Back with ASP.net MVC -

i new mvc . , have been studying code of musicstore application in codeplex.

i unable understand following code meant:

 // ajax: /shoppingcart/removefromcart/5          [httppost]         public actionresult removefromcart(int id)         {             // remove item cart             var cart = shoppingcart.getcart(this.httpcontext);              // name of album display confirmation             string albumname = storedb.carts                 .single(item => item.recordid == id).album.title;              // remove cart             int itemcount = cart.removefromcart(id);              // display confirmation message             var results = new shoppingcartremoveviewmodel             {                 message = server.htmlencode(albumname) +                     " has been removed shopping cart.",                 carttotal = cart.gettotal(),                 cartcount = cart.getcount(),                 itemcount = itemcount,                 deleteid = id             };              return json(results);         }          //         // get: /shoppingcart/cartsummary          [childactiononly]         public actionresult cartsummary()         {             var cart = shoppingcart.getcart(this.httpcontext);              viewdata["cartcount"] = cart.getcount();              return partialview("cartsummary");         }     } } 

please me clarify , how particluar httppost works ajax post .

hi can use jquery ajax make asynchronous postback request

please see code below

$.ajax({   type: "post",   url: @url.action("removefromcart"),   data: ({             id:1          }),   success: success,   datatype: datatype }) 

[httppost] -- attribute ensures removefromcart action method accepts post requests

[childactiononly] -- attribute ensures action method can called child method within view. these typically associated partial views.