Develop Reference

Return parameter null in controller from ajax

I don't know what happened the value sent to the controller is always null, even though in the console.log the value is there, please I need help
this is my ajax:
$('#ddlItemName').change(function () {
var ItemCode = $('#ddlItemName').text();
if (ItemCode != '') {
var RequestParam = {
search: ItemCode
}
console.log(RequestParam);
$.ajax({
url: '/Order/CustomerItemOrders',
type: 'POST',
data: JSON.stringify(RequestParam),
contentType: 'application/json; charset=utf-8',
success: function (data) {
alert(data[0].Name);
},
error: function (data) {
toastr.error(data);
}
});
}
$('#ddlItemName').text('');
});
This is my controller :
[HttpPost]
public JsonResult CustomerItemOrders([FromBody] string search)
{
var result = _order.BindCustomerOrders(search);
return Json(result.data);
}
This is my error :
enter image description here
I've tried adding '[FromBody]' but the value parameter still doesn't get sent

I recomend you add the parameter to query
If you insist on pass the value with request body
Try creat a model:
public class SomeModel
{
public string search{get;set;}
}
in your controller:
public JsonResult CustomerItemOrders([FromBody] SomeModel somemodel)
{
.......
}

Getting exeption when sending variable via ajax

Getting an error when trying to delete a user from db.
Here is the code that i wrote:
This is server side:
#RestController
public class EmployeeRestController {
#DeleteMapping( value = "/delete_user")
public List<Employee> deleteEmployee(#RequestParam(value = "id") Integer id) {
employeeService.deleteEmployee(id);
List<Employee> list = employeeService.getAllEmployees();
return list;
}
}
Client side:
function delete_row(id){
$.ajax({
type:'DELETE',
url:'/delete_user',
dataType: 'json',
data:JSON.stringify({
id:id
}),
success:function(data){
console.log(data);
}
});
}
Error from server side :
DefaultHandlerExceptionResolver[0;39m [2m:[0;39m Resolved [org.springframework.web.bind.MissingServletRequestParameterException: Required Integer parameter 'id' is not present]
Error code from client side is 400
I am noob at ajax , javascript and spring. Sorry if the problem is obvious and thanks in advance.

did you tried this
function delete_row(id){
$.ajax({
type: "DELETE",
url: "/delete_user",
data: { id: id },
success: function (data) {
console.log(data);
},
error: function () {
}
});
}
or directly bind to url
function delete_row(id){
$.ajax({
type: "DELETE",
url: "/delete_user?id="+id,
success: function (data) {
console.log(data);
},
error: function () {
}
});
}

Try using PathVariable instead of RequestParam.
#DeleteMapping(value = "/delete_user/{id}")
public List<Employee> deleteEmployee(#PathVariable("id") Integer id) {
employeeService.deleteEmployee(id);
List<Employee> list = employeeService.getAllEmployees();
return list;
}
}

How to make a AJAX GET call in ASP.NET MVC application

I am learning web development. And I just want to make a simple AJAX GET call in ASP.Net MVC Application and I want visualize how it works. But I am not able to do so. I am a beginner and I could have done any silly mistakes. But as of now there are no errors in my code.
Below is what I have:
So, I have a Index.cshtml file which is already loaded. Now in that page I want to make an Ajax GET call to one of the function that I have written in the HomeController and action name is Test. I just want to hit the breakpoint in that Test Action of Homecontroller and return something back to the Success of AJAX Call.
In HomeController I have below Action
[HttpGet]
public ActionResult Test()
{
return View("hello");
}
jQuery
$.ajax({
url: '/Home/Test',
type: 'GET',
success: function (html) {
alert(html);
},
error: function (error) {
$(that).remove();
DisplayError(error.statusText);
}
});
}
Confusion: Do I need to create a cshtml for Test. But I actually do not want that. I just want the Test Action to return me one data. And I will display that data in my Already opened Index.csthml file.
Error: No error but I am not able to hit the breakpoint in Test Action of controller. Kindly note that Success of AJAX is hitting but I do not see any data. But I am sure it did not hit the test Action breakpoint.

Change your action method like this
[HttpGet]
public JsonResult Test()
{
return Json("myContent",JsonRequestBehavior.AllowGet);
}
And in your success method in 'html' variable you will get back "myContent".

Example :
function RemoveItem(ItemId) {
if (ItemId && ItemId > 0) {
$.ajax({
cache: false,
url: '#Url.Action("RemoveItem", "Items")',
type: 'POST',
data: { id: ItemId },
success: function (result) {
if (result.success == true) {
$("#CartItemGridDiv").load('#Url.Content("~/User/Items/CartItemGrid")');
alert('Item Removed successfully.');
}
else {
alert('Item not removed.');
}
},
error: function (result) {
alert('Item not removed.');
}
});
}
}
public ActionResult RemoveItem(int id)
{
if (id > 0)
{
bool addToChart = false;
addToChart = Utilities.UtilityClass.RemoveItem(id);
if (addToChart)
{
return Json(new { success = true }, JsonRequestBehavior.AllowGet);
}
}
return Json(new { success = false }, JsonRequestBehavior.AllowGet);
}
public ActionResult CartItemGrid()
{
List<CartItems> oItemList = (List<CartItems>)Session[MvcMAB.StringConst.CartItemSession];
return View(oItemList);
}

Since you don't want to return a view, you might need to return Json() instead of View()
You need to Allow Get in the action. Like that:
public ActionResult SomeGetAction(int? id)
{
//Some DB query here
var myJsonList = myListQuery;
return Json(myJsonList, JsonRequestBehavior.AllowGet);
}
Or in case of just Simple string response:
public ActionResult SomeGetAction()
{
return Json("My String", JsonRequestBehavior.AllowGet);
}
I would recommend renaming html into response.
Also change that to this in Error Response section.
$.ajax({
url: '/Home/Test',
type: 'GET',
success: function (response) {
alert(response);
},
error: function (error) {
$(this).remove();
DisplayError(error.statusText);
}
});
Enjoy.

C#:
public JsonResult Test()
{
return Json("hello");
}
Jquery:
$.ajax({
url: '/Home/Test',
type: 'Post',
dataType: 'json',
success: function (html) {
alert(html);
},
error: function (error) {
alert(error);
}
});

Controller not receiver parameter passed by ajax POST in .Net MVC

I want to make an ajax shopping cart, the GetCarts and AddCart all working, but the RemoveRow not
receiver the parameter "strms". When alert(strms) in removeRow(strms) js function, it show right value
of the book id (equal 8). But in the CartController/RemoveRow debug, the strms value is NULL.
I think it's can be a problem with the routing, but I think my route configs are right!
Please help me.
The view is _Layout.cshtml, which contain js code
The controller is CartController
My RouteConfig.cs
public class RouteConfig
{
public static void RegisterRoutes(RouteCollection routes)
{
routes.IgnoreRoute("{resource}.axd/{*pathInfo}");
routes.MapRoute(
name: "Default",
url: "{controller}/{action}/{id}",
defaults: new { controller = "Sach", action = "Detail", id = "7" }
);
routes.MapRoute(
"Cart",
"{controller}/{category}/{ms}/{sl}",
new { controller = "Cart", action = "AddCart", ms = UrlParameter.Optional, sl = UrlParameter.Optional }
);
routes.MapRoute(
"CartRemoveRow",
"{controller}/{action}/{ms}",
new { controller = "Cart", action = "RemoveRow", ms = UrlParameter.Optional });
}
}
CartController.cs
public class CartController : Controller
{
List<CartItem> listCart;
[HttpPost]
public ActionResult GetCarts()
{
listCart = Cart.getCart(Session);
return PartialView("Cart", listCart);
}
public void AddCart(string ms, string sl) {
int masach = int.Parse(ms);
int soluong = int.Parse(sl);
Cart.AddCart(masach, soluong, Session);
//return PartialView("Default");
}
public void RemoveRow(string strms)
{
int ms1 = int.Parse(strms);
var sach = new Sach() { MaSach = ms1 };
Cart.removeCart(sach, true);
}
}
Ajax js code
<script type="text/javascript">
function showCart() {
// alert("1");
//Load content from CartController
$(function () {
//alert("2");
$.ajax({
type: "POST",
url: '#Url.Action("GetCarts", "Cart")',
success: function (data) {
var result = data;
$('#myCart').html(result);
//alert($('#myCart').html());
}
});
});
$("#myCart").modal('show');
}
function addCart(ms, sl) {
var masach = [];
masach.push(ms);
masach.push(sl);
// alert(masach);
$(function () {
$.ajax({
type: 'POST',
url: '#Url.Action("AddCart", "Cart")/'+ms+'/'+ $("#soluong").val(),
success: function (data) {
showCart();
}
});
return false;
});
}
function removeRow(strms){
$(function () {
// alert(strms);
$.ajax({
type: 'POST',
url: '#Url.Action("RemoveRow", "Cart")/' + strms,
success: function (data) {
showCart();
}
});
});
}
</script>

try passing the parameter in the data property, I have multiple examples but not at home right now.
function removeRow(this_strms){
$(function () {
// alert(strms);
$.ajax({
type: 'POST',
url: '#Url.Action("RemoveRow", "Cart")',
data: { strms: this_strms},
success: function (data) {
showCart();
}
});
});
}
I normally pass C# objects/classes as parameters like this
public void RemoveRow(CartObject strms)
{
int ms1 = strms.ms1;
var sach = new Sach() { MaSach = ms1 };
Cart.removeCart(sach, true);
}
in JS i do something like this
var thisCartObject= {
ms1: 1,
otherproperty: 0.4,
otherproperty2: "Description"
};
function removeRow(thisCartObject){
$(function () {
// alert(strms);
$.ajax({
type: 'POST',
url: '#Url.Action("RemoveRow", "Cart")',
data: JSON.stringify({ strms: thisCartObject}),
contentType: 'application/json',
dataType: 'json',
success: function (data) {
showCart();
}
});
});
}
If you are going to try this, try without! your custom route defined in the RegisterRoutes class first.

Rename the javascript variable: "strms" to "ms" and then send it, because in your route "CartRemoveRow" you will receive a variable declared with the name "ms" not "strms".
And of course, in your controller, rename the parameter in the method "RemoveRow" to "ms".
Or more short, change your route to accept "strms":
routes.MapRoute(
"CartRemoveRow",
"{controller}/{action}/{strms}",
new { controller = "Cart", action = "RemoveRow", strms = UrlParameter.Optional });
}

Problems updating database with Jquery.Ajax

I am working on a website and would like to be able to update a field on a database table when a div is clicked. I found some example code right here on stack but for some reason it won't work, even though it was accepted. I am using C# ASP.NET MVC Razor.
My JavaScript function is as follows:
function toggleContent(id, instID) {
var doc = document.getElementsByClassName("messageContent")[id];
$(doc).slideToggle();
$.ajax({
type: 'POST',
url: "#Url.Content('/Messages/MarkSeen/')",
data: {
instanceID : instID
},
dataType: 'json'
});
}
And my JsonResult is as follows:
[HttpPost]
public JsonResult MarkSeen(int instanceID)
{
var markSeen = db.MessageInstances.First(mi => mi.MessageInstanceId == instanceID);
if (markSeen.RegisteredPerson.PersonId == CurrentUser.PersonId)
{
markSeen.Seen = true;
db.SaveChanges();
return Json(true);
}
return Json(false);
}

I'm not sure where your code fails, so I posted complete working code
If you are using the ApiController, please try the following updates to make your code works:
1. add route to WebApiConfig.cs
config.Routes.MapHttpRoute(
name: "DefaultApi",
routeTemplate: "api/{controller}/{action}/{id}",
defaults: new { id = RouteParameter.Optional }
);
2. javascript
$.ajax({
type: "POST",
url: "#Url.Content("/api/lab/MarkSeen")",
data: { "instanceID": instID },
dataType: 'json',
success: function (data) { alert(data)},
error: function () { alert('error'); }
});
3. Add model to match the json from ajax request:
public class labModel
{
public int instanceID { get; set; }
}
4. Controller:
[System.Web.Mvc.HttpPost]
public JsonResult<bool> MarkSeen(labModel data)
{
return Json(true);
}