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Ajax data not reaching backend C# code

Below is the code which i m trying to send. As you can see, ajax call is made at UI and data 'sub' is passed through. this 'sub' has an array of objects in it. So data is present when it is passed.
UI SIDE
$scope.save = function () {
var sanit = $scope.gridOptions.rowData;
var sub = JSON.stringify(sanit);
$.ajax({
type: 'POST',
url: '/api/Pr/PM',
data: sub, //this has data in it
contentType: "application/json"
}).success(function (response) {
window.alert("Database updated successfully.");
})
};
However, when i debug the code at backend, the parameters is showing as null. i have commented the section showing this is null where the data is showing as null at the start of backend function.
BACKEND C# SIDE
[HttpPost]
public HttpResponseMessage PM([FromBody] string parameters) //this is null.
{
string message = string.Empty;
try
{
var model = JsonConvert.DeserializeObject<List<PODetails>>(parameters);
message = "Insert Successfull";
return Request.CreateResponse(HttpStatusCode.OK, message);
}
catch (Exception ex)
{
message = "Insert fail";
return Request.CreateErrorResponse(HttpStatusCode.NoContent, message);
}
}
Can someone please let me know why it is showing as null value at backend.

You need to ensure the data you're sending via AJAX is an object with a single parameter, which should be named the exact same as the parameter your backend is expecting.
In this case:
$.ajax({
type: 'POST',
url: '/api',
data: JSON.stringify({ parameters: sub }),
contentType: "application/json"
}).success(function (response) {
...
})
Next, if the variable "sub" is an array of objects then you must create a class model server side to match the structure of the data being sent. Then, your API's interface should be expecting a list of that newly created class.
For example:
[HttpPost]
public HttpResponseMessage PM(List<YourClassModel> parameters)
{
...
}
Your API should now be able to receive and read the data being sent via the AJAX call above.

Take a look at this: Post a json object to mvc controller with jquery and ajax
You are sending a list of objects but trying to recieve it as string. You should change your function parameter from (String parameters) to (List parameters) and change your ajax request according to the link above. That will probably solve your problem.
(ps: i couldn't try it myself that's why i said probably :) )

form serialize in ajax post with ckeditor throws ajax error

I am using ckeditor in our project. passing that value in ajax post like
//$form is -> $('form') jquery object
$("#ajaxsubmitbutton").on('click', function () {
CKupdate();
$.ajax({
type: ($form.attr('method').toLowerCase() == 'post' ? 'POST' : 'GET'),
url: ($form.attr('action') == 'undefined' ? window.location : $form.attr('action')),
data: $form.serialize(),
success: function (data) {
// Use local eval, since it will work in this context
callbackFunction(data);
},
error: function () {
var data = "ajaxerror";
callbackFunction(data);
}
});
});
Ckeditor update code :
function CKupdate(){
for ( instance in CKEDITOR.instances )
CKEDITOR.instances[instance].updateElement();
}
$form.serialize having below value :
"Id=0&Title=dfg&ShortText=rer&CultureCode=en-US&StartDate=3%2F12%2F2014&EndDate=3%2F26%2F2014&Text=%3Cp%3Etest3%3C%2Fp%3E%0D%0A"
controller code :
public JsonResult Save(int id, string title, string shortText, string text, DateTime? startDate, DateTime? endDate, string cultureCode)
{
//process some operation
}
it throws some ajax error like " 500 -internal server not found". i don't know what is the real cause for this issue
may be the problem in serializing the form. any help on this.

I suspect that the tags are the issue here-
Assuming Asp.net MVC here you have two options-
Decorate your model property with the [AllowHtml] method (not sure how much of a pain it would be to convert your properties to a model here)
Put the [ValidateInput(false)] tag on your controller method
You may need to add the following tag to system.web in your config as well
<httpRuntime requestValidationMode="2.0"/>
You may also run into issues if your submit isn't a post in which case you'll want to add allowget to your return value.
Not sure if this is your issue without the full error but that is where I'd start. You may want to check the response in fiddler or firebug to see if you can get more information on that exception.
Hope that helps.

Web Service method name is not valid

I get the following error "Web Service method name is not valid" when i try to call webmethod from javascript
System.InvalidOperationException: SaveBOAT Web Service method name is not valid.
at System.Web.Services.Protocols.HttpServerProtocol.Initialize()
at System.Web.Services.Protocols.ServerProtocol.SetContext(Type type, HttpContext context, HttpRequest request, HttpResponse response)
at System.Web.Services.Protocols.ServerProtocolFactory.Create(Type type, HttpContext context, HttpRequest request, HttpResponse response, Boolean& abortProcessing)
HTML Code :
<asp:LinkButton runat="server" ID="lnkAddBoat" OnClientClick="javascript:AddMyBoat(); return false;"></asp:LinkButton>
JS Code :
function AddMyBoat() {
var b = document.getElementById('HdnControlId').value;
jQuery.ajax({
type: "GET",
url: "/AllService.asmx/SaveBOAT",
data: { Pid: b },
contentType: "application/text",
dataType: "text",
success: function(dd) {
alert('Success' + dd);
},
error: function(dd) {
alert('There is error' + dd.responseText);
}
});
}
C# Code (Web method in AllService.asmx file)
[WebMethod]
public static string SaveBOAT(int Pid)
{
// My Code is here
//I can put anythng here
SessionManager.MemberID = Pid;
return "";
}
I tried all solutions found on Stack Overflow and ASP.NET site.but none of them worked for me.

It was a silly mistake.
remove Static keyword from method declaration.
[WebMethod]
public string SaveBOAT(string Pid)
{
SessionManager.MemberID = Pid;
return "";
}

In my case I had copied another asmx file, but not changed the class property to the name of the new class in the asmx file itself (Right click on asmx file -> View Markup)

In my case the error was that the Web Service method was declared "private" instead of "public"

Try using this, I think datatype should be JSON
jQuery.ajax({
type: "POST", // or GET
url: "/AllService.asmx/SaveBOAT",
data: { Pid: b },
contentType: "application/json; charset=utf-8",
dataType: "json"
success: function(dd) {
alert('Success' + dd);
},
error: function(dd) {
alert('There is error' + dd.responseText);
}
});
And in C# Code change Pid to string
[WebMethod]
public static string SaveBOAT(string Pid)
{
SessionManager.MemberID = Pid;
return "";
}

I too faced the similar issue. The solution includes checking everything related to ensuring all name, parameters are passed correctly as many have responded. Make sure that the web method name that we are calling in UI page is spelled correctly, the data, data types are correct and etc. In my case, I misspelled the web method name in my ajax call. It works fine once I found and corrected the name correctly.
For Ex: In .asmx class file, this is the method name "IsLeaseMentorExistWithTheSameName" but when I called from UI this is how I called:
var varURL = <%=Page.ResolveUrl("~/Main/BuildCriteria.asmx") %> + '/IsLeaseMentorExistWithSameName';
Notice that the word "The" is missing. That was a mistake and I corrected and so it worked fine.

As Sundar Rajan states, check the parameters are also correct. My instance of this error was because I had failed to pass any parameters (as a body in a POST request) and the asmx web method was expecting a named parameter, because of this the binding logic failed to match up the request to the method name, even though the name itself is actually correct.
[WebMethod]
public object MyWebMethod(object parameter)
If there is no parameter in the body of the request then you will get this error.

Did U add ServiceReference Class. Check this once. Based on your comment I can tell what to do

I had this issue because my soap method had a List<string> parameter. Couldn't figure out a way to make it work with the array parameter; so just converted the parameter to a &-delimited string (e.g. val1&val2&val3) and converted the parameter to an array in the service method.

In my case, one of the WebService receiving parameters was called aId. When I called it from javascript, I was sending the correct Id value, but the name of the sent variable was incorrectly called bId. So I just had to rename the WebService call, keep the correct value like before, and just change the variable name.

Getting JSON Object Result from $.post()

I'm attempting to call a web service via AJAX in a WebForms application.
My script looks something like this:
$.post('UpdateServer.asmx/ProcessItem',
'itemId=' + $(this).text(),
function (result) {
alert(result);
});
My web service looks something like this.
[WebService(Namespace = "http://tempuri.org/")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
[System.ComponentModel.ToolboxItem(false)]
[System.Web.Script.Services.ScriptService]
public class UpdateServer : System.Web.Services.WebService
{
[WebMethod]
public string ProcessItem(int itemId)
{
return new JavaScriptSerializer().Serialize(
new { Success = true, Message = "Here I am!" });
}
}
The web method is called as expected and with the expected argument. However, the argument passed to my success function (last parameter to $.post()) is of type document and does not contain the Success and Message members that I'm expecting.
What's are the magic words so that I can get back the object I'm expecting?
EDIT
On closer inspection, I can find the data I'm looking for as follows:
result.childNodes[0].childNodes[0].data:
"{"Success":true,"Message":"Server successfully updated!"}"

The reason you're seeing that odd structure of nodes that end with JSON is because you're not calling the service the necessary way to coax JSON out of ASMX ScriptServices and then returning a JSON string anyway. So, the end result is that you're returning an XML document that contains a single value of that JSON string.
The two specific problems you're running into right now are that you're manually JSON serializing your return value and you're not calling the service with a Content-Type of application/json (.NET needs that to switch to JSON serializing the response).
Once you fixed those issues, you'd also run into an "invalid JSON primitive" error due to the data parameter being URL encoded instead of a valid JSON string.
To get it working, do this on the server-side:
[ScriptService]
public class UpdateServer : System.Web.Services.WebService
{
[WebMethod]
public object ProcessItem(int itemId)
{
return new { Success = true, Message = "Here I am!" };
}
}
You could also create a data transfer object (aka ViewModel) to return instead of using an anonymous type and object, if you want.
To successfully get raw JSON out of that, do this on the client-side:
$.ajax({
url: 'UpdateServer.asmx/ProcessItem',
type: 'post',
contentType: 'application/json',
data: '{"itemId":' + $(this).text() + '}',
success: function(result) {
// This will be { d: { Success: true, Message: "Here I am!" } }.
console.log(result);
}
});
If you have a few minutes, read through the posts in the communication section of jQuery for the ASP.NET developer. You'll find a lot of that information helpful as you continue down this path.
Note: The links that helmus left were relevant. Nothing has fundamentally changed between 2.0 and present with regards to using ASMX ScriptServices to communicate via JSON. If you're interested in the truly cutting edge approach to this problem in .NET, ASP.NET Web API is the way to go.

Add this attribute to your ProcessItem method:
[ScriptMethod(ResponseFormat = ResponseFormat.Json)]

Be more explicit in your $.post call.
$.ajax({
type:'post',
url:'UpdateServer.asmx/ProcessItem',
data: {'itemId':$(this).text()}
}).done(function (result) {
alert(result);
});

ASP.NET MVC submitting json array to controller as regular post request (nonajax)

All the examples of json I can find online only show how to submit json arrays w/ the jquery command $.ajax(). I'm submitting some data from a custom user control as a json array. I was wondering if it's possible to submit a json array as a regular post request to the server (like a normal form) so the browser renders the page returned.
Controller:
[JsonFilter(Param = "record", JsonDataType = typeof(TitleViewModel))]
public ActionResult SaveTitle(TitleViewModel record)
{
// save the title.
return RedirectToAction("Index", new { titleId = tid });
}
Javascript:
function SaveTitle() {
var titledata = GetData();
$.ajax({
url: "/Listing/SaveTitle",
type: "POST",
data: titledata,
contentType: "application/json; charset=utf-8",
});
}
Which is called from a save button. Everything works fine but the browser stays on the page after submitting. I was thinking of returning some kind of custom xml from the server and do javascript redirect but it seems like a very hacky way of doing things. Any help would be greatly appreciated.

This is an old question but this might be useful for anyone finding it --
You could return a JsonResult with your new titleId from the web page
public ActionResult SaveTitle(TitleViewModel record) {
string tId = //save the title
return Json(tId)
}
and then on your ajax request add a success function:
function SaveTitle() {
var titledata = GetData();
$.ajax({
url: "/Listing/SaveTitle",
type: "POST",
data: titledata,
contentType: "application/json; charset=utf-8",
success: function(data) { window.location = "/Listing/Index?titleId=" + data; }
});
}
That would redirect the page after a successful ajax request.
I just saw that you mentioned this at the end of your post but I think it is an easy and quick way of getting around the issue.

Phil Haack has a nice post discussing this scenario and shows the usage of a custom value provider instead of an action filter.

I don't understand why you would want to post Json if you're wanting to do a full page post. Why not just post normal form variables from the Html form element?