TreeView is not getting refreshed when I bind it from AjaxManager_AjaxReqest

[Phani]

Dear Team,

I'm displaying hierarchical data using Treeview. We need to change the datasource of treeview dynamically based on user input. I'm using the below code do achieve the functionality:

In ASPX:

function LoadTreeView(projectid) {
                        var ajaxManager = $find("<%= RadAjaxManagerforGrid.ClientID %>");
                        ajaxManager.ajaxRequest("treeview_databind," + projectid);
                     }

 

In Code behind:

protected void RadAjaxManagerforGrid_AjaxRequest(object sender, AjaxRequestEventArgs e)
       {
           string[] arguments = e.Argument.Split(',');
           if (arguments[0] == "search")
           {
               string _search = arguments[1];
               int result = BindProjectData(false, _search);
               if (result == 0)
               {
                   Label lblEmptyMessage = RadListView1.Controls[0].FindControl("lblmessage") as Label;
                   lblEmptyMessage.Text = "No records to display.";
               }
           }
           else if(arguments[0] == "treeview_databind")
           {
               int? folderId = Convert.ToInt32(arguments[1]);
               BindFolderTreeViewData(folderId);
               hdnSelectedFolderId.Value = arguments[1];
               ScriptManager.RegisterClientScriptBlock(this, typeof(Page), "alertScript", "$('#video-move').modal('show');", true);
           }
       }

 

BindFolderTreeViewData() Method:

 

protected void BindFolderTreeViewData(int? folderId)
       {
           if(folderId!=null)
           {
           RadTreeFolders.Nodes.Clear();
           List<Folder> lst = DomainDAL.GetFolderHierarchy(folderId);
           RadTreeFolders.DataSource = lst;
           RadTreeFolders.DataFieldID = "FolderID";
           RadTreeFolders.DataFieldParentID = "ParentFolderID";
           RadTreeFolders.DataValueField = "FolderID";
           RadTreeFolders.DataTextField = "FolderName";
           RadTreeFolders.DataBind();
      }

 

Treeview is not getting refreshed/not displaying any data. Can you please help

 

Thanks,

Phani

[Eyup]

Hello Phani,

In order for the AjaxRequest event handler to have effect over other controls, they should be set as UpdatedControls by the manager in the AjaxSettings:

<telerik:AjaxSetting AjaxControlID="RadAjaxManager1">
    <UpdatedControls>
        <telerik:AjaxUpdatedControl ControlID="RadTreeView1" />
    </UpdatedControls>
</telerik:AjaxSetting>

Could you verify that this is done on your side?

Regards,
Eyup
Telerik

[Phani]

Thanks Eyup. I verified the Ajax Settings. I defined wrongly. That is the reason, it was not getting updated properly.

 

Thanks for your help.

Phani

[Eyup]

Hello Phani,

I'm glad the suggested solution has proven helpful.
Please keep in mind that using RadAjaxPanel simultaneously with RadAjaxManager or UpdatePanel ( or implementing multiple wrapped RadAjaxPanels ) is not a supported scenario and we highly recommend to avoid such implementation. Either use just the manager to update your controls replacing the UpdatePanel / RadAjaxPanel with a regular asp:Panel, or use the UpdatePanel / RadAjaxPanel alone to wrap your page:
http://www.telerik.com/help/aspnet-ajax/ajax-controls-in-ajaxpanel-and-ajaxsettings.html

Regards,
Eyup
Telerik