If you have a page with Telerik UI for ASP.NET AJAX RadHtmlChart and try to add Kendo UI for jQuery Notification to that page...
The JavaScript:

var notif = jqueryobject.kendoNotification({appendTo: "#appendto"}).data("kendoNotification");

You cannot call notif.show() because notif is undefined.
We added a kendoNotification to our skin and on pages that use Telerik UI for ASP.NET AJAX RadHtmlChart causes this problem. Other pages with other Telerik UI for ASP.NET AJAX controls work fine.
We have also seen this issue on one other Telerik UI for ASP.NET AJAX control: RadClientDataSource
Any work-around to get this working?

Hi! We have had this problem for quite some time now.We have this code:

 <telerik:RadClientDataSource ID="csDsInprog" runat="server" EnableServerPaging="false" EnableServerSorting="false" AllowPaging="false" ClientEvents-OnCustomParameter="ParameterMap" EnableViewState="false"
              ClientEvents-OnRequestEnd="showInProgressGrid">
              <DataSource>
                <WebServiceDataSourceSettings>
                  <Select Url="/user/history/Default.aspx/GetHistoryInProg" RequestType="POST" DataType="JSON" ContentType="application/json" />
                </WebServiceDataSourceSettings>
              </DataSource>
              <Schema DataName="d">
              </Schema>
            </telerik:RadClientDataSource>

This is the ClientDataSourceID for a radgrid. However, when there are no records returned by the URL, we see that it does multiple postbacks. If it does return information, it does the postback only once.

Can you help us with this one? We have updated to the latest version of the UI but still it has the same error.

Hi i have a simple API .Net Core to get a list of College, this is my local URL ( http://localhost:58887/colleges ) and the JSON result :

Then im trying to populate a RdaGrid with a RadClientDataSource, this is my code 

None of them are working, the RadGrid its showing no records

Please advice
Regards,

Alberto

Could someone provide an example of how to use ClientDataSource in an ASP.NET WebForms environment?

e.g. with PageMethods which pass data back to the client for usage in, say, a combobox?

All the examples I see online deal with MVC or Web Service configurations and do not provide adequate documentation on how to use in a legacy webforms environment.

I'm using the following ClientDataSource to bind a radgrid. 

The Web API action to do the update is as follows:

My question is: how can I return a message from PutAPD back to the client? I want to be able to inform the user in case the update failed.

My 

As per the documentation on .fetch():

"The fetch method makes a request to the remote service only the first time it is called"

Why???

If a RadGrid is client bound to RadClientDataSource,  I can call .rebind() on the grid and it will call the Select webservice again,   so there must be a way to "reset" something so that .fetch() will call the webservice every time it's called?

I’m trying to set up a call to an api method inside of some client side javascript.
The javascript function (GetDb) is called from the ClientEvents-OnValueChanged event of a RadMaskedTextBox

In that javascript function I set the url of a RadClientDataSource and do a fetch. To be honest I don’t completely understand how this works and how I can access the data using the RadClientDataSource after the fetch. My goal is to call the api through the javascript and get data back that I need to use.

As you can see in the RadClientDataSource, I have a dummy url which I replace in the Javascript function GetDb. I did this because if there was an empty url in the RadClientDataSource I was unable to set the dataSource._transport.read.url in the javascript. The url will have to be created dynamically in the long run (right now it’s hard coded) so I am changing the transport url in the javascript. Eventually the final parameter in the rest call in the url will have to be passed and will be variable.

From what I can see the a RadClientDataSource is not being activated and the api method is not being called. After the fetch I looked at the data source property and there were no rows

I set up the API by creating a Controllers folder in my project and then adding a scaffolded controller that uses Entity framework. This API controller inherits from APIController.

I tested the controller by running the function I want to use (GetMeasureByControlName) in fiddler and it worked.

Below is the code. I pieced this together from existing examples but there is none that do exactly what I want. I’d appreciate any help.

<telerik:RadMaskedTextBox ID="RadMaskedTextBox1" runat="server" Width="80px" Mask="##.##" ClientEvents-OnValueChanged="GetDb" >  </telerik:RadMaskedTextBox>



<telerik:RadClientDataSource runat="server" ID="RadClientDataSource1">
    <DataSource>
        <WebServiceDataSourceSettings ServiceType="OData">
            <Select Url="localhost:53558/api/measure/GetProductById/blah" DataType="JSONP" />
        </WebServiceDataSourceSettings>
    </DataSource>
</telerik:RadClientDataSource>

I set a dummy url because unless there was something in there I couldn’t reset the transport url below in GetDb (javascript function).

Here is Clientside code called by the RadMaskedTextBox1 above:

function GetDb(sender, args) {
            debugger;
            var docTypeID='<%=Session["DocTypeId"]%>';
            if (args != null) {
                var value = args.get_newValue();
                var dataSource = $find("<%= RadClientDataSource1.ClientID%>");
                dataSource._transport.baseUrl = 'http://localhost:53558/api/documentmeasuretypes/';
                dataSource._transport.read.url = dataSource._transport.baseUrl + "GetMeasureByControlName/CYLINDER%20BLOCK%20HEIGHT";
                dataSource.fetch();
                var items = dataSource.view();
                var item = items[0];
                alert(item);
                alert('after fetch');
            }
        }

After the fetch the Total rows in the data source was 0.

The controller method does work; I tested it in fiddler. Here it is.
        public DocumentMeasureType GetMeasureByControlName(string controlname)
        {
            using (APIManufacturingEntitiesConsolidated db = new APIManufacturingEntitiesConsolidated())
            {
                var product = db.DocumentMeasureTypes.FirstOrDefault(m => m.MeasureName.Contains(controlname));
                if (product == null)
                {
                    throw new HttpResponseException(HttpStatusCode.NotFound);
                }
                return product;
            }
        }

And here is the routing:
  RouteTable.Routes.MapHttpRoute(
           name: "ActionApi",
           routeTemplate: "api/{controller}/{action}/{controlname}",
           defaults: new { id = RouteParameter.Optional }
);

            RouteTable.Routes.MapHttpRoute(
            name: "DefaultApi",
            routeTemplate: "api/{controller}/{id}",
            defaults: new { id = System.Web.Http.RouteParameter.Optional }

I'm hoping this is a silly error

this is the markup

this is the JSON that the service is returning

no matter what i do, the service is getting called three times on the in initial page load

from the network log in chrome

(there is nothing in the code-behind)

any ideas?