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ASP.NET MVC JSON get value with two Parameters

I am trying to get value based on 2 parameters, below is my function where I added my 2 parameters in JSON stringify :
function GetItemLocationOnHand(itemId, locationId) {
var data = JSON.stringify({
itemId: itemId,
locationId: locationId
});
$.ajax({
async: true,
type: 'GET',
dataType: 'JSON',
contentType: 'application/json; charset=utf-8',
data: data,
url: 'getItemInventory3',
success: function (data) {
$("#txtInventory3").val(parseFloat(data).toFixed(2));
},
error: function () {
alert("Error")
}
});
}
Below is my code in my controller to retrieve the data I want based on these two parameters :
[HttpGet]
public JsonResult GetItemLocationOnHand(int itemId, int locationId)
{
var itemLocQuantity = objDB.ItemLocationDatas.Single(items => items.ItemId == itemId && items.LocationId == locationId).Quantity;
return Json(itemLocQuantity, JsonRequestBehavior.AllowGet);
}
Upon calling this function via below on change code, I can't seem to get my data and is always returning the error.. If I only have 1 parameter, then no error encountered.
Please advise what went wrong when trying to pass 2 parameters.
$("#LocationId").change(function () {
var itemId = $("#ItemId").val();
var locationId = $("#LocationId").val();
GetItemLocationOnHand(itemId, locationId)
});

Issue solved by doing the following :
added correct URL which is GetItemLocationOnHand
removed Stringify and used var data = ({ itemId: itemId, locationId:
locationId });
thanks a lot to Freedom and Reflective and others for your comments!
function GetItemLocationOnHand(itemId, locationId) {
var data = ({ itemId: itemId, locationId: locationId });
$.ajax({
async: true,
type: 'GET',
dataType: 'JSON',
contentType: 'application/json; charset=utf-8',
data: data,
url: 'getItemLocationOnHand',
success: function (data) {
$("#txtInventory3").val(parseFloat(data).toFixed(2));
},
error: function () {
alert("Error")
}
});
}

Just to avoid some misunderstanding how AJAX GET works and setting some parameters which you don't have to set (i.e. you are still not so deep into jQuery AJAX) you may use the shortcut they also implemented i.e. $.get so your request will look as simple as that and you can't get wrong as it will use the proper defaults for GET. If you want the response to be treated as JSON, just set Content-type of your response headers (from backed) to application/json. This will be checked by jQuery AJAX response handler and it will parse the incoming data as JSON.
var data = {itemId: 1, locationId: 2 };
$.get('GetItemLocationOnHand', data, function (data) {
$("#txtInventory3").val(parseFloat(data).toFixed(2));
}).fail(function (jqXHR, textStatus ) {
alert(`Error = ${jqXHR.status} ${textStatus}`);
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>

See my example below. This works for me when doing ajax requests to a MVC controller with multiple params.
Below is my MVC controller action with multiple params.
// GET
[HttpGet]
public ActionResult Index(string referenceID, int typeID, int supplierID, bool isArchived)
{
// Do CODE here
}
Below is my Ajax request that I use to get or post. Depending on your needs. I use data type 'JSON' and format my data as a JSON object.
var formData = {referenceID: 'Test', typeID: 3, supplierID: 2, isArchived: false};
$.ajax({
type: 'GET',
cache: false,
url: getActionUrl, // url: domain/controller/action |or| domain/area/controller/action
dataType: 'json',
contentType: 'application/json; charset=utf-8',
headers: headers, // ignore if not needed. I use it for __RequestVerificationToken
data: formData,
success: function (data, status, xml) {
// do something with the data
},
error: function (xml, status, error) {
console.log(xml)
// do something if there was an error
},
complete: function (xml, status) {
}
});
I think your issue might be that you are using 'JSON.stringify'. It could be interpreting your JSON string as a single parameter input and not two separate parameters.
Please see below snippets from documentation. https://api.jquery.com/jquery.ajax/
If json is specified, the response is parsed using jQuery.parseJSON before being passed, as an object, to the success handler. The parsed JSON object is made available through the responseJSON property of the jqXHR object.
The data option can contain either a query string of the form key1=value1&key2=value2, or an object of the form {key1: 'value1', key2: 'value2'}. If the latter form is used, the data is converted into a query string using jQuery.param() before it is sent. This processing can be circumvented by setting processData to false. The processing might be undesirable if you wish to send an XML object to the server; in this case, change the contentType option from application/x-www-form-urlencoded to a more appropriate MIME type.

Ajax call to MVC controllers

I'm trying to pass some data with ajax call to a c# mvc controller. Even though the task should be straight forward, I am unable to get the mvc controller to read the data I'm passing through the ajax call....
I've implemented the following code within my MVC controller
[HttpPost]
public string tt(string o)
{
return o;
}
[HttpPost]
public string tt2(string o)
{
return "lala";
}
And I'm triggering the following ajax calls from the browser
$.ajax({
url: "/Home/tt2",
type: "POST",
contentType: "application/json;",
data: JSON.stringify({ o: 'asdas'}),
success: function(e){console.log(e+' correct');},
error: function(e){console.log(e+' incorrect');}
});
$.ajax({
url: "/Home/tt",
type: "POST",
contentType: "application/json;",
data: JSON.stringify({ o: 'asdas'}),
success: function(e){console.log(e+' correct');},
error: function(e){console.log(e+' incorrect');}
});
As a result when running the first ajax call the result is
lala correct
And for the second ajax call, the result is
undefined correct
In the mean time these are some stuff I tried
Adding dataType: "json", to the ajax call
Changing the string data from {o: 'asdas'} to 'asdas'
Removing the JSON.stringify
Adding the charset=utf-8 to the contentType
Changing the ajax call type and MVC controller method from POST to GET to PUT
Changing the MVC controller method parameter from string to int
Removing the error method from the ajax call
Changing the data from data: {o: 'asdas'} to data: {"o":"asdas"}
Changing the data from data: {"o":"asdas"} to data: JSON.stringify({"o":"asdas"})
I know that simple string or int can be passed through the URL as query strings but it would be an issue when passing a list of objects..
Something aside is that the call is being done correctly to the URL because when I set a breakpoint within the called method, it does get triggered but the parameter always is null..
Any thoughts on how to make ajax call work?

try:
[HttpPost]
public string tt([FromBody]string o)
{
return o;
}

Your request should be like this:
$.ajax({
url: '#Url.Action("tt", "Home")',
data: {
"o": "asdasdas"
},
cache: false,
type: "POST",
success: function (response) {
},
error: function (xhr) {
}
});

ajax post data is null in controller asp.net mvc 5

I try to send a JSON object back to the server. This is my AJAX call
function SaveData() {
var model = []
debugger
$.each($('.Money'), function (i, item) {
model.push({
Money: $('.Money').eq(i).val(),
Day: $('.Day').eq(i).val(),
Note: $('.Note').eq(i).val()
});
})
$.ajax({
url: '#Url.Action("Create")',
contentType: "application/json",
async: true,
data: { partnerDeposit: JSON.stringify(model) },
type: 'POST',
dataType: 'json',
succsess: function () {
}
})}
This is the method in the controller which is being called:
enter image description here
https://i.stack.imgur.com/FqEt9.png
The problem I have is that always the json variable from above is an empty object. The success function gets called but when I debug the json var is displayed as empty.
Please tell me what I am doing wrong. Thank you.

Try adding the partnerDeposit to the JSON.stringify call like this:
$.ajax({
url: '#Url.Action("Create")',
contentType: "application/json",
async: true,
data: JSON.stringify({partnerDeposit: model}),
type: 'POST',
dataType: 'json',
succsess: function () {
}
})

I haven't found this answer anywhere else so I had to discover it through experimentation. Hopefully this will help someone.
You'll find that in your controller, it's receiving a Request.Form object and if you look in Request.Form[0] you'll find your data. The reason that there's data in the form but MVC is seeing it as null is that the key to the form element being POSTed is "" (blank).
So client side, you have to set content type properly, and precede your data with something like "myData=" + JSON.stringify(myJSONObject), where "myData" is the key name you are adding, like so:
$.ajax({
type: "POST",
url: URL,
data: "myData="+JSON.stringify(myJSONObject),
contentType: "application/x-www-form-urlencoded; charset=utf-8"
On the server side, your [HttpPost] endpoint has to have as its input a variable with the same name as the key you declared in your AJAX, like so:
`
[HttpPost]
[Authorize]
public ActionResult Index (string myData) // <-- var name matches AJAX
{
// de-serialize data into server-side object using
// JSONConvert.DeserializeObject
}
`

MVC Send list through AJAX

Okay, I've seen tons of questions posted regarding this question, but none of the answers has actually worked for me, here's my AJAX:
$.ajax({
url: "/FilterSessions/GetFilterSession",
type: "GET",
dataType: "json",
data: jsonFilters,
traditional: true,
success: function (response) {
//Haha, it's never entering here. not really.
}
});
var "jsonFilters" contains an array with the following data:
[0] = { Path: "Test", Name: "More testing", Value: "Test Value" },
[1] = { Path: "Test", Name: "More testing", Value: "Test Value" }
And this is my controller:
public ActionResult GetFilterSession(List<FilterSessionModel> jsonFilters)
{
//Do things
return Json(false, JsonRequestBehavior.AllowGet);
}
jsonFilters always remains null... I have also tried adding contentType: "application/json; charset=utf-8" to the AJAX call... but that didn't really do anything
Finally, the class FilterSessionModel is structured as follows:
public class FilterSessionModel
{
public string Path { get; set; }
public string Name { get; set; }
public string Value { get; set; }
}
Any ideas as to what I might be missing or what might be happening?
Things I've tried so far:
Setting "traditional: true", setting "contentType", using JSON.stringify and attempting to accept a string in the MVC Controller (no-go)
UPDATE: Thanks to the answer below I realized that what was missing was to send over the data with the param Id like so:
data: "{param1ID:"+ param1Val+"}"

I would try switching out the type on your action.
List<FilterSessionModel>
Pretty sure the above is not going to work, I would try something like Object.
Or possibly a string that I would then use newton json dll to push into your List of Class.
The problem boils down to your action being unable to figure out the type, assuming you are checking your data prior to the ajax get being called.
**Update due to more info. Add in the error portion and view those vars on return from your controller, also fire up fiddler and watch what your are getting for http numbers.
$.ajax({
type: "POST",
url: "Servicename.asmx/DoSomeCalculation",
data: "{param1ID:"+ param1Val+"}",
contentType: "application/json; charset=utf-8",
dataType: "json",
success: function(msg) {
UseReturnedData(msg.d);
},
error: function(x, t, m, b) {
//Look at the vars above to see what is in them.
}
});

I think what you are looking for is answered here:
Passing A List Of Objects Into An MVC Controller Method Using jQuery Ajax

First off I'm making the assumption that your $.ajax is for JQuery and not some other Javascript framework. Please correct me if that's wrong.
ASP.NET MVC can actually do what you are asking it to (resolve data sent via AJAX to a List<FilterSessionModel>, but it seems to have a difficult time doing it via a GET request. It would help to know which version of ASP.NET MVC you are using, as more is required to get this working on the older versions. However, what I'm suggesting should work on MVC 3 or 4.
When you send AJAX via JQuery using a GET request and passing it a JavaScript array, this is what you are sending to the server:
http://localhost:50195/FilterSessions/GetFilterSession?undefined=&undefined=
It's no wonder the model is null because no data is actually being sent.
I believe ASP.NET can accept objects (and even arrays of objects) like this, but it won't do so with it formatted as JSON (like via JSON.stringify) as that just results in the following request:
http://localhost:50195/FilterSessions/GetFilterSession?[{%22Path%22:%22Test%22,%22Name%22:%22TestName%22,%22Value%22:%22Testing%22},{%22Path%22:%22Test%22,%22Name%22:%22TestName%22,%22Value%22:%22Testing%22}]
The way you probably want to do this is with a POST request. ASP.NET MVC will actually accept a JSON string as POST data and will decode it and resolve the model properly. Your AJAX code works fine with a couple modifications:
$.ajax({
url: "/FilterSessions/GetFilterSession",
type: "POST", //Changed to POST
dataType: "json",
data: JSON.stringify(jsonFilters), //Pack data in a JSON package.
contentType: "application/json; charset=utf-8", //Added so ASP recognized JSON
traditional: true,
success: function (response) {
alert('Success!');
}
});
The controller you posted should recognize POST data already, but in case it doesn't, a simple [HttpPost] attribute is all you need:
[HttpPost]
public ActionResult GetFilterSession(List<FilterSessionModel> jsonFilters)
{
//Do things
return Json(false, JsonRequestBehavior.AllowGet);
}

javascript or ajax call never type cast the object. . .you need to set type of the controller side parameter either string or List else you can also set the Object type. . If you modified codein that way.. .Your code definitely work !!!

$.ajax({
url: "/FilterSessions/GetFilterSession",
type: "GET",
dataType: "json",
data:JSON.stringify({ 'jsonFilters': jsonFilters}),
contentType: 'application/json; charset=utf-8',
success: function (response) {
//Do your action
}
});

Trouble posting form data to MVC4 controller action method using jQuery

I have a form with a textarea and when trying to send the information, I am using JSON.stringify, I get errors. Here is the code:
$.ajax({
type: "POST",
dataType: "json",
data: JSON.stringify({
reportid: data["reportid"], //Guid
assessmentId: data["assessmentId"], //Guid
title: data["title"], //string
body: data["body"], //string
section: data["section"], //string
reportsection: data["reportSection"] //string
}),
url: "/Assessments/ModifyAssessmentTemplateText",
success: function (data) {
lastModified = data["LastModified"];
updateLastModified(lastModified);
alert(data);
}
});
My controller method was set up as follows:
[POST("ModifyAssessmentTemplateText")]
[AjaxOnly]
public JsonResult ModifyAssessmentTemplateText(Guid reportid, Guid assessmentid, string title, string body, string section, string reportSection)
{
//...
}
I get a 500 server error.
I know that when I tried testing, and had only one parameter, reportid, and had my method accept a string, it worked. But when I set it to Guid I get the 500 error. Is there a way I should be parsing the JSON server side?
EDIT:
Note: when I don't use data, and I do
url: "/Assessments/ModifyAssessmentTemplateText?reportid=" + reportid
it works with no problem.

I think the answers so far are dancing around the point. Your data doesn't have to be a string at all, have you tried this?
$.ajax({
type: "POST",
dataType: "json",
data: {
reportid: data["reportid"], //Guid
assessmentId: data["assessmentId"], //Guid
title: data["title"], //string
body: data["body"], //string
section: data["section"], //string
reportsection: data["reportSection"] //string
},
url: "/Assessments/ModifyAssessmentTemplateText",
success: function (data) {
lastModified = data["LastModified"];
updateLastModified(lastModified);
alert(data);
}
});

You don't have to call JSON.stringify, because you are expecting parameters so it should be key value pairs and you are trying to POST JSON object.
You may crate parameter that matches JavaScript object and then use JSON.stringify, this way model binder will try to deserialize it into the object.

So I managed to find the answer on http://encosia.com/asmx-scriptservice-mistake-invalid-json-primitive/. Essentially, what I needed to do was encapsulate the JSON string in quotation marks. This made the string a JSON string rather than a JavaScript Object literal.
Quoted from the site:
The solution is as simple as two single-quotes:
// RIGHT
$.ajax({
type: 'POST',
contentType: 'application/json',
dataType: 'json',
url: 'WebService.asmx/Hello',
data: '{ FirstName: "Dave", LastName: "Ward" }'
});
Did you spot the difference?
Instead of a JavaScript object literal, the data parameter is a JSON string now.
The difference is subtle, but helpful to understand. Since it’s a string,
jQuery won’t attempt to perform any further transformation,
and the JSON string will be unimpeded as it is passed to the ASMX ScriptService.

Have you tried posting the guid as a string and parsing out a Guid on the server?

If you trying to send data as json. You should know:
Specifying the Data Type for AJAX Requests
json - Evaluates the response as JSON and sends a JavaScript Object to the success callback.
But how binder detect that it is json request?
By contentType: 'application/json; charset=utf-8'