Develop Reference

ajax POST sending null

I originally wrote the call as a GET but found a limitation with the length of the URI. Ideally, the call will take an object and turns it into a JSON format string, then sends it to a controller which will encrypt that string. The controller will send back a true/false if it succeeded.
My problem with POST, once it reaches the controller, the data parameter set from the ajax is null.
Here is the ajax/js:
var encActionURL = '#Url.Action("Encrypt", "Home")';
$.ajax({
url: encActionURL,
type: "POST",
contentType: "application/json; charset=utf-8;",
dataType: "json",
async: true,
traditional: true,
data: { jsonDoc: JSON.stringify(jsonDataFile) },
success: /*OnSuccess*/ function (result) {
// DO STUFF;
}
});
Here is the controller:
[HttpPost]
public bool Encrypt(string jsonDoc)
{
return serverConnection.Encrypt();
}
Note that, when I simply change the type to 'GET', it works great but when the form gets too long, it throws a 414 status error.
Most of the fixes found that I seem to have is the 'application/json'. I've also set ajax to traditional.

After going through a rabbit-hole of security tokens and validating forms, it wasn't any of that... this might be a solution for anyone using ASP.NET Core 2.1 MVC (5?) or just in general. Could have been a syntax mistake, return type mistake, or a combination.
New Ajax
$.ajax({
url: encActionURL,
type: "POST",
data: { 'jsonDoc': JSON.stringify(jsonDataFile) }, // NOTICE the single quotes on jsonDoc
cache: false,
success: /*OnSuccess*/ function (result) {
// DO STUFF;
}
});
New Controller
[HttpPost]
public ActionResult EncryptJSON(string jsonDoc) // Switch to ActionResult, formerly JsonResult
{
return Json(serverConnection.Encrypt());
}

getting data from controller in error function of jquery ajax -- Asp.net MVC

I have a jquery ajax script like following
$.ajax({
type: "POST",
url: "Main/receive", // the method we are calling
contentType: "application/json; charset=utf-8",
data: JSON.stringify({ 'p':$("#txtname").val() }),
dataType: "json",
success: function (result) {
alert('Yay! It worked!');
// Or if you are returning something
},
error: function (result) {
alert('Oh no zzzz:('+result.responseText);
}
});
And I am calling to Controller action method. The data is sending to the controller's action method and I am also receiving data from the controller. But the data that I am receiving is inside the error function of jquery ajax.
I want it to be inside the success function.
Why my success function is not getting called.
Following is my controller's action method,
[HttpPost]
public string receive(string p)
{
ViewBag.name = p;
return p;
}

The reason for the error is that you have specified that the returned data type be json (in the line dataType: "json",) but you method returns text. You have 2 options.
Change the controller method to return json using return Json(p);
Change the ajax option to dataType: "text", or just omit it
However you can improve your script as noted below
$.ajax({
type: "POST",
url: '#Url.Action("receive", "Main")', // don't hardcode url's
data: { p: $("#txtname").val() }, // no need to stringify (delete the contentType: option)
dataType: "json",
success: function (result) {
alert('Yay! It worked!');
},
error: function (result) {
alert('Oh no zzzz:('+result.responseText);
}
});
or even simpler
$.post('#Url.Action("receive", "Main")', { p: $("#txtname").val() }, function(result) {
alert('Yay! It worked!');
}).fail(function(result) {
alert('Oh no zzzz:('+result.responseText);
});
Notes: You should always use #Url.Action() to generate the correct urls, and it is not necessary in this case to stringify the data (but you need to remove the contentType: line so it used the default application/x-www-form-urlencoded; charset=UTF-8)
In addition, this is not strictly a POST (your not changing data on the server - but I assume this is just for testing). And there is no point in the line ViewBag.name = p; - it does nothing in your context, and as soon as you return from the method, ViewBag is lost anyway.

try to change your controller code as follows
[HttpPost]
public ActionResult List(string p)
{
ViewBag.name = p;
return Json(ViewBag);
}

Your controller method should look like this:
[HttpPost]
public ActionResult receive(string p)
{
return Json(p);
}

How to serialize model, pass it to MVC controller in ajax request

I'm trying to pass my page's model to my controller for processing.
After processing the information, I want to update the div of id "savedText" to display "Billing Information saved successfully."
I have this in my view
function testingFunction() {
var obj = $('testForm').serialize();
$.ajax({
url: '#Url.Action("TestingFunction", "BuildGiftCard")',
dataType: 'json',
success: function (result) {
$("#savedText").html(result);
},
contentType: 'application/json; charset=utf-8',
data: JSON.stringify(obj)
});
return false;
}
and I have this in my controller:
[HttpPost]
public JsonResult TestingFunction(PurchaseModel model)
{
return Json("Billing information saved successfully.");
}
what am I doing wrong?
When "inspecting element" in chrome, in the network tab, it's saying that my controller method isn't found.
Also, it's important for me to get the entire model from the view into the controller's function (TestingFunction in this case) so that I can get the form information and save it. I'm trying the .serialize() function but that results in obj = (empty string).

Three things:
$('testForm') should probably be $('.testForm') or $('#testForm'). As it is you're trying to select a <testForm></testForm>.
If you're just sending the form, it doesn't need to be json.
Try doing a post request:
$.ajax({
url: '#Url.Action("TestingFunction", "BuildGiftCard")',
dataType: 'json',
success: function (result) {
$("#savedText").html(result);
},
data: $('#testForm').serialize(),
type: 'POST'
});

Retrieving Value post from $.ajax in ASP.NET MVC 4 Controller Method

I have write down a script as following
var reason = prompt("Please Enter the Reason", "");
if(reason != null)
{
// alert('you are here');
$.ajax({
type: "POST",
url: "/Controller/ActionMethod",
content: "application/json; charset=utf-8",
dataType: "json",
data: Json.stringify(reason),
success: function(){ alert('Data Sent');}
});
}
which works fine as it calls the ActionMethod from the controller but i am not being able to retrieve data taken with the help of prompt. within the controller.
I have tried
String reason = Request["reason"];
as well as i have tried to pass the data as argument in controller
public ActionResult ActionMethod(int id, string reason)
but in all cases reason is null. please tell me how can i retrieve the reason from the same.
thanks in advance

$.ajax({
type: 'POST',
url: "/Controller/ActionMethod",
data:{'reason':reason},
dataType: 'json',
success: function(jsonData) {
},
error: function(error) {
}
});
Your action maybe like this
[HttpPost]
public ActionResult ActionMethod(string reason){
...
return Json(obj);
}

this should work: Request.Form["reason"].

Data Format Jquery Ajax Post Cross Domain Call Asp.Net MVC method

I am trying $.ajax post MVC call from http to https cross domain.
Client Side
enter code here
$.ajax({
type: 'post',
crossDomain: true,
url: 'https://localhost/views/Member/VerifyEmail',
beforeSend: function () { alert('I am sending'); },
data: '{name:"John"}',
dataType: "json",
success: function (data) { pdata = data; }
});
Server Side
[RequireHttps]
[HttpPost]
public string VerifyEmail(string name){
return "got it"
}
I have added Access-Control-Allow-Origin to web.config so the call can be established fine. Now the problem is on server side I got variable name = null
I have also checked debugging and found the data has actually been send to server
HttpContext.Request.Form
{%7bname%3a%22hello%22%7d}
[System.Web.HttpValueCollection]: {%7bname%3a%22hello%22%7d}
The question is how I could retrieve it from the web method?

%7bname%3a%22hello%22%7d This is HTML entity String please Decode the String then parse for JSON.

I think you can change your call to
$.ajax({
type: 'post',
crossDomain: true,
url: 'https://localhost/views/Member/VerifyEmail',
beforeSend: function () { alert('I am sending'); },
data: 'John',
dataType: "text",
success: function (data) { pdata = data; }
});