Invalid web service call missing parameter

3 posts, 0 answers
  1. Johnny Smith
    Johnny Smith avatar
    3 posts
    Member since:
    Jun 2009

    Posted 11 May 2012 Link to this post

    Thanks in advance for any help.
    I used the telerik sample as a basis for this code.   Running the sample on my local Windows 7 machine works but fails in my local dev application.  "Invalid web service call missing parameter" error occurs when calling tooltip.set_value()

    var sServiceTrack = oGrid.get_masterTableView().get_dataItems()[sRowIndex].get_dataItem()["service_track_event_id"];
    var sPeople = oGrid.get_masterTableView().get_dataItems()[sRowIndex].get_dataItem()["people_id"];
    var sParms = sServiceTrack + "~" + sPeople;
    //must be a client
    if (sServiceTrack == null || sServiceTrack == "")
    var tooltipManager = $find("<%= objRadToolTipManagerClient.ClientID %>");
    //If the user hovers the image before the page has loaded, there is no manager created
    if (!tooltipManager) 
    //Find the tooltip for this element if it has been created 
    var tooltip = tooltipManager.getToolTipByElement(element);
    //Create a tooltip if no tooltip exists for such element 
    if (!tooltip)
        tooltip = tooltipManager.createToolTip(element);
    //Let the tooltip's own show mechanism take over from here - execute the onmouseover just once
    element.onmouseover = null;
    //show the tooltip;



    <telerik:RadToolTipManager ID="objRadToolTipManagerClient" Width="300" Height="100"
        OffsetY="-1" HideEvent="Default" runat="server" EnableShadow="true" RelativeTo="Element"
        Position="MiddleRight" ShowEvent="OnMouseOver" EnableViewState="false" 
        IgnoreAltAttribute="true" >
        <WebServiceSettings Path="wsToolTips.asmx" Method="GetClientToolTipSingelParm" />

    Web service

    using System;
    using System.Collections.Generic;
    using System.Linq;
    using System.Web;
    using System.Web.Services;
    using System.Configuration;
    using System.Web.Script.Services;
    using System.Data;
    using System.Web.UI;
    using System.IO;
    using System.Reflection;
    namespace EvolvCS
        [WebService(Namespace = "")]
        [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
        // To allow this Web Service to be called from script, using ASP.NET AJAX, uncomment the following line. 
        public class wsToolTips : System.Web.Services.WebService
            public string GetClientToolTipSingelParm(string sValues)
                string[] aValues = sValues.Split('~');
                string serviceTrackId = aValues[0];
                string peopleId = aValues[1];
                return ViewManager.RenderClientToolTip(serviceTrackId, peopleId);
        public class ViewManager
            public static string RenderClientToolTip(string strServiceTrackId, string strPeopleId)
                Page pageHolder = new Page();
                client_header_multi viewControl = (client_header_multi)pageHolder.LoadControl("client_header_multi.ascx");
                viewControl.serviceTrack = strServiceTrackId;
                viewControl.people_id = strPeopleId;
                StringWriter output = new StringWriter();
                HttpContext.Current.Server.Execute(pageHolder, output, false);
                return output.ToString();


  2. Johnny Smith
    Johnny Smith avatar
    3 posts
    Member since:
    Jun 2009

    Posted 11 May 2012 Link to this post

    Found the problem and fixed it but this is rather strange.  A parameter in the web service method MUST be named 'context' otherwise it won't work.  Here is what worked:  Can someone document this?
    [WebMethod(EnableSession=true, Description="Gets client tooltip HTML")]
    public string GetClientToolTipSingelParm(object context)
        IDictionary<string, object> contextDictionary = (IDictionary<string, object>)context;
        string sValues = ((string)contextDictionary["Value"]);
  3. Marin Bratanov
    Marin Bratanov avatar
    3899 posts

    Posted 15 May 2012 Link to this post

    Hello Johnny,

    I am glad to hear you have managed to resolve the situation.

    The signature of the webservice is exposed in several places and they all include the parameter with the name set to context. This variable is actually parameter used in the RadToolTipManager's code when passing/reading/loading the data and thus it should stay with the same name. WebService loading is done almost without any code from the developer - all this code resides in the RadToolTipManager's source code and unfortunately, for this case, you cannot optionally name it because in the source code the object must have a name and we have chosen context.

    All that being said - I will update the resources to emphasize the need to keep the parameter name to "context" and it will be live with our next upload for the Q2 release.

    Kind regards,
    the Telerik team
    If you want to get updates on new releases, tips and tricks and sneak peeks at our product labs directly from the developers working on the RadControls for ASP.NET AJAX, subscribe to their blog feed now.
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