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MVC ajax json post to controller action method

user2705 Published in July 19, 2018, 7:47 am

I am trying to achieve a JQuery AJAX call to a controller action method that contains a complex object as a parameter. I have read plenty blogs and tried several techniques learned from these. The key post on which I have constructed my best attempt code (below) is the stackoverflow post here .

I want to trigger an asynchronous post, invoked when the user tabs off a field [not a Form save post – as demonstrated in other examples I have found].

My intention is to:

  • Instantiate an object on the client [not the ViewModel which provides the type for the View];
  • Populate the object with data from several fields in the view;
  • Convert this object to JSON;
  • Call the controller action method using the jQuery.Ajax method, passing the JSON object.

The results will be returned as a JSON result; and data will be loaded into fields in the view depending on results returned.

The problems are:

  • If the action method is attributed with the HttpPost attribute, the controller Action method is not invoked (even though the AJAX call type is set to ‘POST’).
  • If the action method isattributed with HttpGet, the values of properties of the parameter are null
  • The ReadObject method throws the error: "Expecting element 'root' from namespace ''.. Encountered 'None' with name 'namespace'".

Hopefully someone can help. Thanks. Code below:

Client js file

 var disputeKeyDataObj = {
     "InvoiceNumber": "" + $.trim(this.value) + "",
     "CustomerNumber": "" + $.trim($('#CustomerNumber').val()) + ""

  var disputeKeyDataJSON = JSON.stringify(disputeHeadlineData);      

     url: "/cnr/GetDataForInvoiceNumber",
     type: "POST",
     data: disputeKeyDataJSON,
     dataType: 'json',
     contentType: "application/json; charset=utf-8",
     success: EnrichedDisputeKeyData(result)

Action Filter and class for the type associated with the Action method parameter

 public class DisputeKeyData  
    [DataMember(Name = "InvoiceNumber")]  
    public string InvoiceNumber { get; set; }

    [DataMember(Name = "CustomerNumber")]
    public string CustomerNumber { get; set; }

Action method on the controller

  [ObjectFilter(Param = "disputeKeyData", RootType = typeof(DisputeKeyData))]  
  public ActionResult GetDataForInvoiceNumber(DisputeKeyData disputeKeyData)  
     return Json(disputeKeyData, JsonRequestBehavior.AllowGet);  
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