RadDock Error in a page with master page 'null' is null or not an object.

[Martin Beeby]

Please Note: This is a solution rather than a question.

On the following example:

http://www.telerik.com/DEMOS/ASPNET/Prometheus/Dock/Examples/MyPortal/DefaultCS.aspx

The following javascript error throws if you are using master pages:

Microsoft JScript runtime error: 'null' is null or not an object.

This is caused by the following line:

ScriptManager.RegisterStartupScript(dock, Me.[GetType](), "AddDock", String.Format("function _addDock() {{" & Chr(13) & "" & Chr(10) & "" & Chr(9) & "Sys.Application.remove_load(_addDock);" & Chr(13) & "" & Chr(10) & "" & Chr(9) & "$find('{1}').dock($find('{0}'));" & Chr(13) & "" & Chr(10) & "" & Chr(9) & "$find('{0}').doPostBack('DockPositionChanged');" & Chr(13) & "" & Chr(10) & "}};" & Chr(13) & "" & Chr(10) & "Sys.Application.add_load(_addDock);", dock.ClientID, DropDownZone.SelectedValue), True)

DropDownZone.SelectedValue is referenced which will return RadDockZone1 instead of the required RadDockZone1.ClientID.

There are a few solutions to this problem but i found the best one was to populate the Rad Dock selector at runtime.

Simply add the following code to the page load:

Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
        If Not Page.IsPostBack Then

            For Each item As ListItem In DropDownZone.Items
                Dim obj As Web.UI.Control = RadDockLayout1.FindControl(item.Value)
                If obj IsNot Nothing Then
                    item.Value = obj.clientID
                End If
            Next
        End If
    End Sub

If a better solution is avalible please post it here.

[Petya]

Hello Martin Beeby,

Thank you for your active effort in improving the quality of the products we offer. I believe the solution you suggested is the most appropriate one.

Best wishes,
Petya
the Telerik team

Instantly find answers to your questions at the new Telerik Support Center

[Jake]

I just added the following in the javascript to grap the client ID:

 

 

 

var dock = $find('<%= RadDock1.ClientID %>');