How can i pass an array of objects from javascript to asp.net-mvc function through ajax?

Question

I have the following javascript code that builds up an array of objects and i am trying to push this to an asp.net-mvc action through an ajax post. I am trying to figure out what is wrong with this below ?

javascript:

var arr = [];
for (var i = 0; i < 5; i++) {
     var obj = {
        statusId: i,
        resizeable: true,
        rows: [1, 2, 3, 4, 5]
      };
      arr.push(obj);
}

$.ajax({
   type: 'POST',
   traditional: true,
   url: '/MyController/UpdateMe',
   data { info: arr },
   success: function () {  
       alert("complete");
   }
});

C# asp.net-mvc action:

public ActionResult UpdateMe(IEnumerable<UpdateInfo> info)
{
     foreach (var item in info)
     {
          Console.Write(item.statusIs + " has + " item.rows.length() + " items ");
     }
}

public class UpdateInfo
{
    public int statusId {get;set;}
    public bool resizable {get;set;}
    public List<int> rows {get;set;}
}

You're missing quotes around "/MyControoller/UpdateMe"? Also, "Controller" seems to be misspelled. — linstantnoodles
– linstantnoodles, Commented Feb 14, 2014 at 3:47
@linstantnoodles - sorry, that was just a typo in the question. updated — leora
– leora, Commented Feb 14, 2014 at 3:57

alexmac · Accepted Answer · 2014-02-14 04:45:11Z

3

By default jQuery.ajax contentType is application/x-www-form-urlencoded. This means that parameters sent in url string. In your case, your array transformed to string: object&object&object.....

To change this behavoir, you should change contentType in jQuery.ajax to application/json and convert your js object to json with JSON.stringify:

$.ajax({
   type: 'POST',
   traditional: true,
   contentType: 'application/json',
   url: '/SchoolDetails/UpdateMe',
   data: JSON.stringify({ info: arr }),
   success: function () {  
      alert("complete");
   }
});

Action in debug:

enter image description here

edited Feb 14, 2014 at 4:45

answered Feb 14, 2014 at 4:12

alexmac

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8 Comments

McGarnagle Over a year ago

Note: the "UpdateMe" action has to be marked with [HttpPost] also.

alexmac Over a year ago

It does not necessarily. Attributes on the action affects for filtering request methods only, ie if added HttpPost attribute, then action will be accept only post requests, if action has no http attributes, it will be accept the all request methods.

leora Over a year ago

@Alexander - this almost works for me. I now see the info array being populated on the server but when i look into the array each item has the statusId populated but the rows array inside is already null (see updated question)

alexmac Over a year ago

@leora, I think your forget to add rows property in UpdateInfo class.

leora Over a year ago

@Alexander - i updated the question to reflect the latest code

|

McGarnagle · Accepted Answer · 2014-02-14 18:54:10Z

0

You cannot pass a JS array as a parameter in a POST request. You have to turn it into a string to pass it to the .NET action. Consider using jQuery.param() to do this. It will convert the object to a string like statusId=valueOfI&resizeable=true. Then you change it from a string back to an array after you receive it in the action (I can't suggest a function since I don't know .NET).

edited Feb 14, 2014 at 18:54

McGarnagle

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answered Feb 14, 2014 at 4:03

cryptochronoconolite

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