How to handle TreeView ClientSide data binding with WebService

[Somnath]

<telerik:RadTreeView ID="rtvResources" runat="server" OnClientNodeClicked="rtvResources_OnClientNodeClicked"
                        OnClientContextMenuItemClicking="rtvResources_OnClientContextMenuItemClicking"
                        OnClientContextMenuShowing="rtvResources_OnClientContextMenuShowing" OnClientNodePopulationFailed="function(o,e){}" >
                        <Nodes>
                            <telerik:RadTreeNode runat="server" Text="Public" AllowDrop="false" CssClass="PUBLIC"
                                ImageUrl="~/Images/folder-icon.png" Selected="true">
                            </telerik:RadTreeNode>
                            <telerik:RadTreeNode runat="server" Text="My Resources" AllowDrop="false" CssClass="USER"
                                ImageUrl="~/Images/folder-icon.png">
                            </telerik:RadTreeNode>
                            <telerik:RadTreeNode runat="server" Text="Search Folders" AllowDrop="false" CssClass="SEARCH"
                                ImageUrl="~/Images/search-folder-icon.png" Value="SEARCH">
                            </telerik:RadTreeNode>
                        </Nodes>
                        <ClientNodeTemplate><span id="#=Value#_span">#=Text#</span> <input type="text" value="#=Text#" style="display:none;width:100px;" id="#=Value#_txtEdit" onblur="javascript:Rename();"></input>
                        </ClientNodeTemplate>
                        <WebServiceSettings Path="ManageResources.aspx" Method="wmGetResources"  />
</telerik:RadTreeView>

This is working fine .
But if I get exception in webservice it throws exption message using alert popup.
I try to handle with OnClientNodePopulationFailed="function(o,e){}"  but still it shows expetion message in window .Please provide way to handle it.

Thanks ,
Somnath

[Ivana]

Hello Somnath,

Would you please specify the error?  Also is this the scenario that you are trying to implement:
http://demos.telerik.com/aspnet-ajax/treeview/examples/functionality/clienttemplates/defaultcs.aspx.

Kind regards,
Ivana
the Telerik team

[Somnath]

Yes I am using same scenario provide in the link.

I want to handle server side exception ,so for testing I threw error is webservice method in that case it showed me error is alert window.
I dont want to do something else may be redirection depends on the error.

Is it possible ?

Thanks & Regards,
Somnath 

[Ivana]

Hello Somnath,

If you need not to show the alert message when a server exception error is thrown you can subscribe to the OnClientNodePopulationFailed event, as you have already done, and cancel the default action of the event.
Here is an example:

function OnClientNodePopulationFailed(sender, args) {
    args.set_cancel(true);
}

<telerik:RadTreeView ID="RadTreeView1" runat="server" OnClientNodePopulationFailed="OnClientNodePopulationFailed">
    <ClientNodeTemplate>
            <img src="#= Value #" alt="#= Value #" />
            <span>#= Text #</span>
    </ClientNodeTemplate>
    <Nodes>
        <telerik:RadTreeNode Text="Group A" Value="A" ExpandMode="WebService" />
        <telerik:RadTreeNode Text="Group B" Value="B" ExpandMode="WebService" />
        <telerik:RadTreeNode Text="Group C" Value="C" ExpandMode="WebService" />
        <telerik:RadTreeNode Text="Group D" Value="D" ExpandMode="WebService" />
    </Nodes>
    <WebServiceSettings Path="defaultcs.aspx" Method="GetTeams" />
</telerik:RadTreeView>

[WebMethod]
public static RadTreeNodeData[] GetTeams(RadTreeNodeData node)
{
    List<Team> data = GetTeams(node.Value);

    List<RadTreeNodeData> result = new List<RadTreeNodeData>();
    foreach (Team team in data)
    {
        RadTreeNodeData childNode = new RadTreeNodeData();
        childNode.Text = team.TeamName;
        childNode.Value = team.FlagImageUrl;
        result.Add(childNode);
    }
     throw new ApplicationException("An error occurred while attempting to populate ");

    return result.ToArray();
}

I hope this is helpful.

Regards,
Ivana
the Telerik team