CODEWITHSUNDEEP
asp.netjqueryasp.net-mvc-4
Explicat
Explicat

Reputation: 1095

Asp.net POST parameter always null

For passing an email address I'm using ajax with POST as type.

$.ajax({
    url: "api/Search/UserByEmail",
    type: "POST",
    data: JSON.stringify({ emailAddress: userEmail }),
    contentType: "application/json;charset=utf-8",
    dataType: "json",
    success: function (data) { ... }
});

Controller:

[HttpPost]
public IEnumerable<Object> UserByEmail([FromBody] string emailAddress) { ... }

That's what Fiddler says:

POST http://localhost:52498/api/Search/UserByEmail HTTP/1.1
Accept: application/json, text/javascript, */*; q=0.01
Content-Type: application/json;charset=utf-8
X-Requested-With: XMLHttpRequest
Referer: http://localhost:52498/#
Accept-Language: de-DE
Accept-Encoding: gzip, deflate
User-Agent: Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.1; WOW64; Trident/6.0)
Host: localhost:52498
Content-Length: 35
DNT: 1
Connection: Keep-Alive
Pragma: no-cache

{"emailAddress":"[email protected]"}

Why is the emailAddress parameter always null?

Upvotes: 3

Views: 3719

Answers (3)

Joseph King
Joseph King

Reputation: 5219

Modify the data property in the original ajax call to

data: '"' + userEmail + '"',

Getting some of these Web API calls to work can sometimes be a little tricky

Upvotes: 0

Marko
Marko

Reputation: 10992

 // JS - jQuery 
 $.ajax({
        url: "/Home/UserByEmail",
        type: "POST",
        data: { emailAddress: "[email protected]" },
        dataType: "json",
        success: function (data) { if(data != null) { alert(data.toString()); } }
    });



  [Serializable]
  public class EmailFormModel {
     public string emailAddress { get; set; }
  }

    [HttpPost]
    public JsonResult UserByEmail(EmailFormModel emailFormModel)
    {
        bool ok = emailFormModel.emailAddress != null;
        return Json(new { ok }); 
    }

Use a formModel and put a serializable attribute on the class and it will serialize your javascript automatically to a C# equivalent. And you don't need to use Json-stringify.

Note a removed the // contentType: "application/json;charset=utf-8", declaration from the ajax-method. I've actually never used it.

Upvotes: 1

Mathew Thompson
Mathew Thompson

Reputation: 56429

I think the JSON.stringify could be your problem. MVC will handle the serialization/deserialization of parameters for you, change it to:

data: { emailAddress: userEmail }

Upvotes: 0

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