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Ajax in MVC 6 - making search function

I have a new project and decided to go with c# .net 6 MVC in VS2022...
In may old projects this code works flawless.
#section Scripts
{
<script type="text/javascript">
$("#Klijent_Name").autocomplete({
source: function (request, response) {
$.ajax({
url: "#Url.Action("SearchKlijenti")",
type: "POST",
dataType: "json",
data: { term: request.term },
success: function (data) {
response($.map(data, function (item) {
return { label: item.label, value: item.label, id: item.id };
}))
}
})
},
minLength: 1,
select: function (event, ui) {
$("#KlijentId").val(ui.item.id);
$("#KlijentLabel").html(ui.item.label);
$("#SearchKupac").val("");
return false;
}
});
</script>
}
and latest variation of controller endpoint:
public JsonResult SearchKlijenti(string term)
{
var klijentVM = _klijent.Search(term);
if (klijentVM != null)
{
var items = klijentVM.Select(x => new { id = x.KlijentId, label = x.FriendlyName });
return new JsonResult(Ok(items));
}
return new JsonResult(Ok());
}
Using latest jQuery 3.6.1, and bootstrap 5.2.0. Tried using jquery-ui.js, jquery.unobtrusive-ajax.js...
Problem is that the call is not triggered, or not finding it's way to controller action. Have tried putting alert(); and omitting data manipulation and calls, but still nothing. When testing jQuery:
$("SearchKupac").keyup(function() {
alert();
});
works.
Tried to debug using Firefox, but either I don't know to use it, or the call is not triggered.
I don't know where and what to look anymore...
EDIT: Here is also HTML snippet
<label asp-for="Klijent.Name">Ime</label>
<input class="form-control ajax" asp-for="Klijent.Name" />
<span asp-validation-for="Klijent.Name" class="text-danger"></span>
I also tried selecting with $("input.ajax")... Tried double and single quotes. Bare in mind, this is a working code from MVC 5 project. It doesn't work in new project

If you want to use keyup event,here is a demo:
<input id="SearchKupac" />
js:
$("#SearchKupac").keyup(function() {
alert();
});
If the id of input is SearchKupac,you need to use $("#SearchKupac") in js.Also,you can use $("#SearchKupac") with autocomplete.
#section Scripts
{
<script type="text/javascript">
$("#SearchKupac").autocomplete({
source: function (request, response) {
$.ajax({
url: "#Url.Action("SearchKlijenti")",
type: "POST",
dataType: "json",
data: { term: request.term },
success: function (data) {
response($.map(data, function (item) {
return { label: item.label, value: item.label, id: item.id };
}))
}
})
},
minLength: 1,
select: function (event, ui) {
$("#KlijentId").val(ui.item.id);
$("#KlijentLabel").html(ui.item.label);
$("#SearchKupac").val("");
return false;
}
});
</script>
}

So Firefox developer tool was of no help. Crome developer tool find an error. It was not apparent immediately, but the jquery-ui.js (of version 1.13.2 in my case) resolved the issue.
<script src="~/js/jquery-ui-1.13.2/jquery-ui.min.js"></script>
There was also an issue in controller. it has to be of type JsonResult and return Json(items) not Json(Ok(items))
public JsonResult SearchKlijenti(string term)
{
var klijentVM = _klijent.Search(term);
if (klijentVM != null)
{
var items = klijentVM.Select(x => new
{
id = x.KlijentId,
name = string.IsNullOrEmpty(x.Name) ? " " : x.Name,
friendly = string.IsNullOrEmpty(x.FriendlyName) ? " " : x.FriendlyName,
person = string.IsNullOrEmpty(x.PersonName) ? " " : x.PersonName,
tel = string.IsNullOrEmpty(x.Contact) ? " " : x.Contact,
mail = string.IsNullOrEmpty(x.Mail) ? " " : x.Mail,
oib = string.IsNullOrEmpty(x.OIB) ? " " : x.OIB,
adresa = string.IsNullOrEmpty(x.Adress) ? " " : x.Adress,
});
return Json(items);
}
return Json(null);
}
And for completeness, here is my script:
#section Scripts
{
<script type="text/javascript">
$("input.ajax").autocomplete({
source: function (request, response) {
$.ajax({
url: "#Url.Action("SearchKlijenti")",
type: "GET",
dataType: "json",
data: { term: request.term, maxResults: 10 },
success: function (data) {
response($.map(data, function (item) {
return {
label: item.friendly,
value: item.friendly,
id: item.id,
name: item.name,
friendly: item.friendly,
person: item.person,
tel: item.tel,
mail: item.mail,
oib: item.oib,
adresa: item.adresa
};
}))
}
})
},
minLength: 1,
select: function (event, ui) {
$("#Klijent_KlijentId").val(ui.item.id);
$("#Klijent_KlijentName").val(ui.item.name)
$("#Klijent_FriendlyName").val(ui.item.label)
$("#Klijent_OIB").val(ui.item.oib)
$("#Klijent_PersonName").val(ui.item.person)
$("#Klijent_Contact").val(ui.item.tel)
$("#Klijent_Mail").val(ui.item.mail)
$("#Klijent_Adress").val(ui.item.adresa)
return false;
}
})
</script>
}
Did not yet test return Json(null), but that is not part of this exercise :)

Razor autocomplete doesen't work when submitted

I'm having some problem with the autocomplete on my Razor project. Everytime it returns me error/failure. Maybe it could be even a stupid thing but I'm new to ASP so it would be difficult for me to notice.
Javascript Code
$(function () {
$('#searchCliente').autocomplete({
source: function (request, response) {
$.ajax({
url: '/Index?handler=Search',
data: { "term": request.term },
type: "POST",
success: function (data) {
response($.map(data, function (item) {
return item;
}))
},
error: function (response) {
alert(response.responseText);
},
failure: function (response) {
alert(response.responseText);
}
});
},
select: function (e, i) {
$("#idCliente").val(i.item.val);
$("#idFatt").val(i.item.val);
},
minLength: 3
});
});
Page Model Code
public IActionResult OnPostSearch(string term)
{
var clientefatt = (from cliente in this.context.Arc_Anagrafiche
where cliente.RagioneSociale.StartsWith(term)
select new
{
label = cliente.RagioneSociale,
val = cliente.IdAnag
}).ToList();
return new JsonResult(clientefatt);
}
HTML Code
<input asp-for="intervento.Cliente" class="form-control" id="searchCliente" />
<input asp-for="intervento.IdClienteFatturazione" class="form-control" id="idCliente" type="hidden" />

Perhaps the issue is related to the AntiForgeryToken, try to add the XSRF-TOKEN property in the request header before sending the Ajax request.
Please refer to the following samples and modify your code:
Add AddAntiforgery() service in the ConfigureServices method:
services.AddAntiforgery(o => o.HeaderName = "XSRF-TOKEN");
In the Ajax beforeSend event, get the RequestVerificationToken from the hidden field, and set the request header:
#page
#model RazorPageSample.Pages.AutocompleteTestModel
<form method="post">
#Html.AntiForgeryToken()
<input type="text" id="txtCustomer" name="label" />
<input type="hidden" id="hfCustomer" name="val" />
<br /><br />
<input type="submit" value="Submit" asp-page-handler="Submit" />
<br />
</form>
#section Scripts{
<script src="https://ajax.aspnetcdn.com/ajax/jQuery/jquery-1.10.0.min.js"></script>
<script src="https://ajax.aspnetcdn.com/ajax/jquery.ui/1.9.2/jquery-ui.min.js" type="text/javascript"></script>
<link href="https://ajax.aspnetcdn.com/ajax/jquery.ui/1.9.2/themes/blitzer/jquery-ui.css" rel="Stylesheet" type="text/css" />
<script type="text/javascript">
$(function () {
$("#txtCustomer").autocomplete({
source: function (request, response) {
$.ajax({
url: '/AutocompleteTest?handler=AutoComplete',
beforeSend: function (xhr) {
xhr.setRequestHeader("XSRF-TOKEN",
$('input:hidden[name="__RequestVerificationToken"]').val());
},
data: { "prefix": request.term },
type: "POST",
success: function (data) {
response($.map(data, function (item) {
return item;
}))
},
error: function (response) {
alert(response.responseText);
},
failure: function (response) {
alert(response.responseText);
}
});
},
position: { collision: "flip" },
select: function (e, i) {
$("#hfCustomer").val(i.item.val);
},
minLength: 1
});
});
</script>
}
Code in the .cshtml.cs file:
public IActionResult OnPostAutoComplete(string prefix)
{
var customers = new List<Customer>()
{
new Customer(){ ID=101, Name="Dillion"},
new Customer(){ID=102, Name = "Tom"},
new Customer(){ ID=103, Name="David"}
};
return new JsonResult(customers.Where(c=>c.Name.ToLower().StartsWith(prefix.ToLower())).Select(c=> new { label = c.Name, val = c.ID }).ToList());
}
public class Customer
{
public int ID { get; set; }
public string Name { get; set; }
}
Then, the screenshot as below:
Reference: jQuery AutoComplete in ASP.Net Core Razor Pages

Maybe you shall assign the ajax datatype property, and also change the "type" property from post to get, as below:
$.ajax({
url: '/Index?handler=Search',
data: { "term": request.term },
datatype: 'json'
type: "GET",
success: function (data) {
response($.map(data, function (item) {
return item;
}))
},
error: function (response) {
alert(response.responseText);
},
failure: function (response) {
alert(response.responseText);
}
});
Also in the Model code you can try one of the following,
as when returning json the JSONRequestBehavior property shall be specified as AllowGet:
return Json(new {clientefatt = clientefatt}, JsonRequestBehavior.AllowGet);
Change the Model code method's return type to JsonResult, as below
public JsonResult OnPostSearch(string term){
return new JsonResult(clientefatt);
}
Most probably the first options, since you're using .net core, will give you an error "ASP.NET Core - The name 'JsonRequestBehavior' does not exist in the current context"

Update DropDownList with AJAX

after typing client name #NAME1 im trying to get this client subaccounts #SUB in list from other table in db, but my list is empty . What im doing wrong?
html
<script type="text/javascript">
var kunnr; var ROLA;
$(document).ready(function () {
$('#NAME1').autocomplete({
source: function (request, response) {
$.ajax({
url: "Form2",
method: 'POST',
data: {
term: $('#NAME1').val()
},
success: function (data) {
response(data);
}});},
select: function (event, ui) {
kunnr = ui.item.kunnr;
}});});
$('#NAME1').change; ({
source: function (request, response) {
$.ajax({
type: "GET",
url: "Form3",
method: 'POST',
data: {
term: $('#SUB').val(), kunnr: kunnr, ROLA:"Slave"
},
success: function (data) {
response(data);
}});}, });
controller
[HttpPost]
public JsonResult Form2(string term)
{
return Json(db.KLIENCI.Where(c => (term!=null && c.NAME1.Contains(term))||(term==null)).OrderBy(x=>x.NAME1).Take(10).Select(a => new { label = a.NAME1,kunnr=a.KUNNR }));
}
[HttpPost]
public JsonResult Form3(string term, string kunnr)
{
return Json(db.CLI2LOGIN.Where(c => ((term != null && c.LOGIN.Contains(term)) || (term == null))&& c.KUNNR== kunnr && c.ROLA == "Slave").OrderBy(x => x.LOGIN).Select(a => new { label = a.LOGIN }).ToList(),JsonRequestBehavior.AllowGet);}

Please find below an example:
View:
<script>
$(document).ready(function () {
$('.maincat').change(function () {
updateSubCategoryList($(this).val());
});
function updateSubCategoryList(catId) {
$('.subcat').empty();
$('.subsubcat').empty();
$.ajax({
url: '#Url.Action("GetSubCategories")',
type: 'Get',
data: { main: catId },
success: function (response) {
var subcat = $('.subcat');
subcat.append('<option value=""></option>');
if (response != null && response != '') {
$.each(response, function (index, value) {
subcat.append('<option value="' + this.SubCategoryID + '">' + this.SubCategoryDescription + '</option>');
});
}
}
});
}
</script>
Controller:
[HttpGet]
public JsonResult GetSubCategories(int main)
{
var i = _jobsservice.GetSubCategories(main);
return Json(i, JsonRequestBehavior.AllowGet);
}

How to set serialization in Asp .Net Core

Im getting the following error on my Ajax post back {"readyState":0,"status":0,"statusText":"error"}
on my first ajax call but the second one returns data I want.
My C# method (UserSelect) JsonResults shows the data when I put break point
My C# code :
public IActionResult OnPostAreaSelect(string Id)
{
//Generating list for Areas
Guid ModelId = new Guid(Id);
List<ModelArea> modelAreas = _context.ModelArea.Distinct()
.Where(w => w.ModelId == ModelId).OrderBy(o => o.AreaColumn.Name).Include(i => i.AreaColumn).ToList();
return new JsonResult(modelAreas);
}
public IActionResult OnPostUserSelect(string Id)
{
//Generating list for Users
Guid ModelId = new Guid(Id);
List<UserModel> userModels = _context.UserModel
.Where(w => w.ModelId == ModelId).OrderBy(o => o.User.FullName)
.Include(i => i.User)
.ToList();
return new JsonResult(userModels);
}
My JavaScript :
<script type="text/javascript">
$(document).ready(function () {
$("#RepfocusModelDropdown").change(function () {
var Id = $(this).val();
if (Id != null) {
$.ajax({
async: true,
type: "POST",
url: "./Create?handler=UserSelect",
beforeSend: function (xhr) {
xhr.setRequestHeader("XSRF-TOKEN",
$('input:hidden[name="__RequestVerificationToken"]').val());
},
data: {
Id: Id
},
crossDomain: true,
dataType: "json",
success: function (response) {
alert(JSON.stringify(response));
},
error: function (response) {
alert(JSON.stringify(response));
}
});
$.ajax({
type: "POST",
url: "./Create?handler=AreaSelect",
beforeSend: function (xhr) {
xhr.setRequestHeader("XSRF-TOKEN",
$('input:hidden[name="__RequestVerificationToken"]').val());
},
data: {
Id: Id
},
dataType: "json",
success: function (response) {
alert(JSON.stringify(response));
},
error: function (response) {
alert(JSON.stringify(response));
}
});
}
})
})
The second ajax call on my script works fine only the first one returns the error
How can I solve the error

When you work with EntityFramework (or other ORM) there may be problems with serialization because an entity could have some circular references. To avoid this problem a solution is to set serialization settings:
services.AddMvc().AddJsonOptions(opt => {
opt.SerializerSettings.ReferenceLoopHandling = Newtonsoft.Json.ReferenceLoopHandling.Ignore;
});
or:
Newtonsoft.Json.JsonConvert.DefaultSettings = () => new Newtonsoft.Json.JsonSerializerSettings {
ReferenceLoopHandling = Newtonsoft.Json.ReferenceLoopHandling.Ignore
};

In Jquery ajax get the detail while entering in one field

I am using MVC. In my one page, if i type one value that is process, if it exists the related details will populate in other all fields. how to do this in Ajax call?
Controller:
public ActionResult GetDetail(string pincode)
{
Partner partner= null;
if (!string.IsNullOrEmpty(pincode))
{
partner= _channelRepository.GetpartnerByPincode(pincode);
}
return View("Call",partner);
}
Call is the Aspx page.
In view:
<script type ="text/javascript">
$('#getPincode').text('Get Pincode') // Sets text for company.
.attr('href', '#');
$("#getPincode").click(function () {
$('#getPincode').text('Get Company')
.attr('href', 'GetDetail?pincode=' + $('#Pincode').val());
});
$("#Pincode").blur(function () {
$("#checkPincode").trigger('click');
});
$(document).ready(function () {
$('#checkPincode').click(function () {
var name = $('#Pincode').val();
var data = 'pincode=' + name;
$.ajax({
type: "GET",
url: "GetDetail",
data: data,
success: function (data) {
alert(data);
}
});
return false;
});
});
</script>
But i don't know how to populate the result into my view which means editor fields???
View:
<%:Html.TextBox("Address")%>

You can try this one:
public JsonResult GetDetail(string pincode)
{
Partner partner= null;
if (!string.IsNullOrEmpty(pincode))
{
partner= _channelRepository.GetpartnerByPincode(pincode);
}
return Json(partner, JsonRequestBehavior.AllowGet);
}
$(document).ready(function () {
$('#checkPincode').click(function () {
var name = $('#Pincode').val();
var data = {'pincode': name};
$.ajax({
type: "POST",
url: "/GetDetail",
data: data,
success: function (data) {
alert(data);
}
});
return false;
});
});

return it as a jsonResult
public JsonResult GetDetail(string pincode)
{
Partner partner= null;
if (!string.IsNullOrEmpty(pincode))
{
partner= _channelRepository.GetpartnerByPincode(pincode);
}
return Json(partner);
}
or if you want to load partial view load it as
public ActionResult GetDetail(string pincode)
{
Partner partner= null;
if (!string.IsNullOrEmpty(pincode))
{
partner= _channelRepository.GetpartnerByPincode(pincode);
}
return PartialView("Call",partner);
}
<div id="myDiv"></div>
$(document).ready(function () {
$('#checkPincode').click(function () {
var name = $('#Pincode').val();
var data = 'pincode=' + name;
$.ajax({
type: "GET",
url: "GetDetail",
data: data,
success: function (data) {
$('#myDiv').html(data);
}
});
return false
});
});