I have same problem as Daniel had in this topic, but his solution doesn't work for me:
So use-case. Users adds 2 new records one after another:
- Presses "Add new record" button of a grid
- Fills the fields (name="Alex", amount=10, comment="first").
- Record one is ready. Press 'Save'. (data goes to controller and than to Database)
User see one record in a grid
Press "Add new record" button again
- Fills fields (name="Bob", amount=20, comment = "second").
Record one is ready. Press 'Save'. Data goes to controller and than to Database. In this moment something happens and grid send Ajax request again with record one data to controller.
User updates grid and see three records
"Alex | 10 | first" (duplicated record) ID = 1
"Bob | 20 | second" ID = 2
"Alex | 10 | first" ID = 1
They recommend to return an ID for correct binding\update of data source with new record. And I return it (new ID from database comes in response with bouns entity)! and this doesn't help. Only if I add first record and refresh page with F5 and after that add second record everything is ok. But if add another one, the third records - problems appears again
Code in controller:
[HttpPost]
public JsonResult Create(BonusDto bonusDto)
{
BonusAggregate bonus;
if (bonusDto.Amount <= 0)
throw new ArgumentOutOfRangeException("Amount should be more than 0");
if (bonusDto.EmployeeId <= 0)
throw new ArgumentNullException("You should specify an existing employee");
using (var dbContext = new DatabaseContext())
{
BonusesRepository = new BonusesRepository(dbContext);
var employeeRepository = new EmployeesRepository(dbContext);
bonus = new BonusFactory(employeeRepository).Create(bonusDto);
BonusesRepository.Save(bonus);
}
HttpContext.Response.StatusCode = (int)HttpStatusCode.Created;
return Json(bonus); // try to return ID after bonus was saved
}
UI Code
// creates bonuses grid control
$("#bonusesGrid").kendoGrid({
dataSource: bonusesDataSource,
toolbar: ["create"],
editable: "inline",
columns: [
"BonusId",
"EmployeeId",
{
field: "EmployeeLastName",
editor: employeeAutocompletingEditor,
template: "#=EmployeeLastName#"
},
"Amount",
{
field: "Comment",
titel: "Comment",
editor: textareaEditor,
filterable: {
operators: {
number: {
contains: "Contains"
}
}
}
},
{
command: ["edit"],
title: " "
}
],
save: function(e) {
if (newValueEmployeeId !== undefined &&
newValueEmployeeLastName !== undefined &&
newValueEmployeeLastName !== "") {
setNewValueEmployeeIdAndLastName(newValueEmployeeId, newValueEmployeeLastName);
gridDataSource.model.EmployeeId = newValueEmployeeId; // it's a hack to bind model and autocomplete control
gridDataSource.model.EmployeeLastName = newValueEmployeeLastName;
} else {
gridDataSource.model.EmployeeId = currentValueEmployeeId;
gridDataSource.model.EmployeeLastName = currentValueEmployeeLastName;
}
},
edit: function(e) {
setCurrentValueEmployeeIdAndLastName(e.model.EmployeeId, e.model.EmployeeLastName);
},
cancel: function(e) {
setCurrentValueEmployeeIdAndLastName(e.model.EmployeeId, e.model.EmployeeLastName);
}
});
Bonus data source:
// bind json result from /Bonuses/GetPagedJsonBonuses
var bonusesDataSource = new kendo.data.DataSource({
transport: {
read: {
url: "@Url.Action("GetPagedJsonBonuses", "Bonuses")",
type : "GET",
contentType: "application/json",
dataType: "json",
cache: false
},
create: {
url: "@Url.Action("Create", "Bonuses")",
dataType: "json",
type: "POST"
},
parameterMap: function(options, operation) {
if (operation === "update" || operation === "create") {
// correct format for conversion
var d = new Date(options.Date);
options.Date = kendo.toString(d, dateFormat);
// updates the BonusDTO.EmployeeId with selected value
if (newValueEmployeeId !== undefined)
options.EmployeeId = newValueEmployeeId;
}
if(operation === "read") {
options.filter = setFormattedFilterDate(options.filter);
}
return options;
}
},
pageSize: 15,
serverPaging: true,
serverSorting: true,
serverFiltering: true,
error: showErrorMessage,
schema: {
data: "Data", // PagedResponse.Data
total: "TotalCount", // PagedResponse.TotalCount
model: {
id: "BonusId", // Data
fields: {
EmployeeId: { type: "number" },
EmployeeLastName: {
type: "string",
editable: true,
nulable: false,
validation: { required: {message: "Employee's last name is required"}}
},
Date: {
type: "date",
editable: true,
nullable: false,
validation: {
required: { message: "Date is required to be set" }
}
},
Amount: {
type: "number",
editable: true,
nullable: false,
defaultValue: 1,
validation: {
required: { message: "Amount is required to be set" }
}
},
Comment: { type: "string", editable: true }
} // fields
} // model
}// schema
});
I haven't seen this problem in my code. I do however have a "complete" event handler on my create and update events that refreshed the grid - it may help you:
dataSource: {
type: "jsonp",
transport: {
read: UrlBase + "getAll",
update: {
url: UrlBase + "Update",
dataType: "jsonp",
complete: function (e) {
$("#grid").data("kendoGrid").dataSource.read();
}
},
create: {
url: UrlBase + "create",
dataType: "jsonp",
complete: function (e) {
$("#grid").data("kendoGrid").dataSource.read();
}
},
destroy: {
url: UrlBase + "destroy",
dataType: "jsonp",
complete: function (e) {
$("#grid").data("kendoGrid").dataSource.read();
}
}
},
...
Yes, hamed is correct. Your "create" action result passes in the object from your model that is to be saved to your database. Have the INSERT in your data access layer return the newly created key ("ID") in the database. Use this key to now set the "ID" field on your model that's passed in to the action result and then passed back to the view as JSON. Now the grid should know it's just created this record and does not need to do anything more with it. Otherwise, the model object returns with the "ID" field set to 0 so the grid thinks it still needs to add this record.
[AcceptVerbs(HttpVerbs.Post)]
public ActionResult Grid_Create([DataSourceRequest] DataSourceRequest request, MyObject obj)
{
if (obj != null && ModelState.IsValid)
{
obj.Id = _myService.Create(obj);
}
return Json(new[] { obj }.ToDataSourceResult(request, ModelState));
}
This error occur when you did not pass Primary key to view in read action.
Regards
An alternative to Quinton Bernhardt's complete event: bind the dataSource.read() to the kendo sync event.
I'm using kendo's C# MVC's html helpers which don't expose the sync event, so I had to modify it after setting up the grid.
On window load:
var grid = $("#GridName").data("kendoGrid");
grid.dataSource.bind("sync", function () {
$("#GridName").data("kendoGrid").dataSource.read();
});
The sync event fires after the save request has been completed. The dataSource.read() gets the latest from the server, including the id that was set server side.
I had a similar issue, did various trials but fixed with the following trial
Jquery
create: {
type: "POST",
dataType: "json",
contentType: "application/json; charset=utf-8",
url: "../../ajax/ajaxGv.aspx/addstaff"
},
parameterMap: function (options, operation) {
if (operation == "create" && options.models) {
return JSON.stringify({ "oStaff": options.models });
}
VB.Net
'Adding Staff
<System.Web.Services.WebMethod()> _
Public Shared Sub addStaff(ByVal oStaff As Object)
Dim strJson As String = JsonConvert.SerializeObject(oStaff)
Dim lstStaff As List(Of Staff) = JsonConvert.DeserializeObject(Of List(Of Staff))(strJson)
Dim db As New LiveB2cDataContext
Try
db.Staff.InsertAllOnSubmit(lstStaff)
Next
db.SubmitChanges()
'Fix is that you need to return the objects you have added in the database back as json to kendo
strJson = JsonConvert.SerializeObject(lstStaff, Formatting.None)
WriteJson(strJson) ' Returning the objects added as json back to Kendo
Catch ex As Exception
ErrorLog(ex)
End Try
End Sub
Public Shared Sub WriteJson(strJson As String)
Try
HttpContext.Current.Response.Write(strJson)
HttpContext.Current.Response.Flush()
HttpContext.Current.ApplicationInstance.CompleteRequest()
HttpContext.Current.Response.SuppressContent = True
Catch ex As Exception
ErrorLog(ex)
End Try
End Sub
Fix is that you need to return the objects you have added in the database back as json to kendo
I'm not sure if this is part of your issue, but in your DataSource's schema model you specify that the ID is the field named "BonusId", but that field isn't specified in the array of fields.
I was having a simular issue.
I fixed it but making sure the id in the model is referring to a field:-
model: {
id: "Id",
fields: {
Id: { editable: false, type: "number" },
AnotherName: { editable: true, type: "string" },
AnotherId: { editable: true, type: "number" }
}
}
This may not solve the asker's problem, but hopefully might help someone with the same issue.
For us, this problem was being caused by errors being returned in JSON. Some required properties didn't have a value, but weren't related to the data we were displaying in the grid. Giving those properties a default value in the grid solved the issue.
You can view the JSON that's being returned by using Fiddler Web Debugging Tools.
来源：https://stackoverflow.com/questions/16373599/kendo-ui-grid-inserts-updates-create-duplicate-records-again