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NullReference when customizing Links ddl

Last post 01-25-2006, 4:11 PM by kcmonster58. 7 replies.


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01-25-2006, 2:23 PM 15118

kcmonster58
Joined on 01-09-2006
Posts 9

NullReference when customizing Links ddl

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The following line gives me a nullreference error :

dropdown = DirectCast(Editor1.ToolControls("Links").Control, CuteEditor.RichDropDownList)

I am using the code given in the example of how to progrommatically set the links in the ddl. What I don't understand is, I get no error at runtime on these lines:

Editor1.Text = ...

Editor1.WysiwygModeCss = ...

I have tried this code in several subroutines such as Page_load, Panel_preRender, etc and always get the same results. What am I missing here?

01-25-2006, 2:29 PM 15119 in reply to 15118

Adam
Joined on 09-23-2003
Aurora, ON
Posts 18,678

Re: NullReference when customizing Links ddl

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The links dropdown has been changed to TreeDropDownList

Dim tdd As CuteEditor.TreeDropDownList

tdd = DirectCast(Editor1.ToolControls("LinkTree").Control, CuteEditor.TreeDropDownList)

The following example shows you how to populate the linktree:

<%@ Page Language="VB" %>
<%@ Register TagPrefix="CE" Namespace="CuteEditor" Assembly="CuteEditor" %>

<html>
    <head>
  <title>ASP and ASP.NET WYSIWYG Editor - How to dynamically populate the tree view dropdown menu? </title>
  <link rel="stylesheet" href="../../example.css" type="text/css" />
</head>
    <body >
        <form runat="server">
   <h2>How to dynamically populate the tree view dropdown menu?</h2> <hr>
   <br />
   <h4>Populate the link tree view dropdown menu</h4>
   <CE:Editor EditorWysiwygModeCss="../../example.css" id="Editor1" UseRelativeLinks="true" runat="server" ></CE:Editor><br />
   <hr>
   <h4>Add new tree view dropdown menu</h4>
   <CE:EDITOR id="Editor2" EditorWysiwygModeCss="../../example.css" Autoconfigure="Minimal" runat="server"></CE:EDITOR>

  </form>
</body>
</html>

   'set the command and event handler
   ddl.Attributes("Command")="PasteHTML"
   'each item's value is just the parameter of Command
   ddl.Attributes("onchange")="CuteEditor_DropDownCommand(this,'"&ddl.Attributes("Command")&"')"

   'set the title
   ddl.RootItem.Text="MyTree"

   'Add items recursive
   AddItems(ddl.Items,"~/Uploads")

   Dim index As Integer
         index = Editor2.ToolControls.IndexOf("insertcustombutonhere") + 1

   Editor2.InsertToolControl(index,"MyTree",ddl)

  End If

End Sub

Public Sub AddItems(ByVal items As CuteEditor.TreeListItemCollection,ByVal virpath As string)
  virpath=virpath.TrimEnd("/"c)

  Dim dir as string
  dir=Server.MapPath(virpath)

  Dim files() As String

  files=System.IO.Directory.GetFiles(dir)

  If files.Length=0 Then
   return 'Skip empty folder
  End If


        Dim diritem As CuteEditor.TreeListItem
        diritem = New CuteEditor.TreeListItem(System.IO.Path.GetFileName(dir))
  diritem.Selectable=false
  items.Add(diritem)


  dim subdir as string
  dim subfile as string

  'for each sub directories
  For each subdir in System.IO.Directory.GetDirectories(dir)

   dim subdirname as string
   dim subvirpath as string
   subdirname=System.IO.Path.GetFileName(subdir)
   subvirpath=virpath & "/" & subdirname

   ' Recursive .
   AddItems( diritem.Items, subvirpath )
  Next

  For each subfile in files

   dim filename as string
   dim filepath as string
   dim filetype as string
   dim subdirname as string
   subdirname=System.IO.Path.GetFileName(subdir)

   filename=System.IO.Path.GetFileName(subfile)
   filepath=ResolveUrl(virpath).TrimEnd("/"c) & "/" & filename
   filetype=System.IO.Path.GetExtension(filename).ToLower()

   If filetype=".gif" or filetype=".jpg" or filetype=".png" Then
    Dim fileitem As CuteEditor.TreeListItem
    fileitem=new CuteEditor.TreeListItem(filename,"<img src='" & filepath & "' />")
    diritem.Items.Add(fileitem)
   End If
  Next

End Sub

</script>

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01-25-2006, 2:51 PM 15122 in reply to 15119

kcmonster58
Joined on 01-09-2006
Posts 9

Re: NullReference when customizing Links ddl

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OK, will this actually change the links in the default LinkTree (as defined in the config file) or will this only create a new linktree. all I really want to do is change the links in the default tree, but I can't seem to do that using the following code:

....

objRead = cmd.ExecuteReader

Dim tdd As CuteEditor.TreeDropDownList

tdd = DirectCast(Editor1.ToolControls("LinkTree").Control, CuteEditor.TreeDropDownList)

tdd.Items.Clear()

While objRead.Read()

Dim rootitem As CuteEditor.TreeListItem

rootitem = New CuteEditor.TreeListItem(objRead("title").ToString, objRead("title").ToString, "~/default.aspx?pageid=" & objRead("id"))

tdd.Items.Add(rootitem)

End While

objRead.Close()

..........

I get no errors, but the links are still the default ones from the config file

P.S. I am running this code in the Editor1_Load sub

01-25-2006, 3:08 PM 15123 in reply to 15122

Adam
Joined on 09-23-2003
Aurora, ON
Posts 18,678

Re: NullReference when customizing Links ddl

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Can you post the whole code?

01-25-2006, 3:09 PM 15124 in reply to 15123

kcmonster58
Joined on 01-09-2006
Posts 9

Re: NullReference when customizing Links ddl

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Here it is:

Protected Sub Editor1_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Editor1.Load
        Dim connstr As ConnectionStringSettingsCollection = ConfigurationManager.ConnectionStrings
        Dim sqlConn As New SqlConnection(connstr("SRHSWeb").ConnectionString)
        Dim strsql As String
        Dim cmd As SqlCommand
        Dim objRead As SqlDataReader
        Dim titlefld As String

sqlConn.Open()

        If editpageid > 0 Then
            strsql = "select body,versiontitle,title,right_content from editpages where id = " & Session("editpageid")
            titlefld = "versiontitle"
        Else
            strsql = "select body,title,right_content from pages where id = " & Session("pageid")
            titlefld = "title"
        End If

cmd = New SqlCommand(strsql, sqlConn)
objRead = cmd.ExecuteReader

        If objRead.HasRows Then
            objRead.Read()
            Editor1.Text = objRead("body").ToString()
            VersionTitle.Text = objRead(titlefld).ToString()
            pageTitle.Text = objRead("title").ToString()
            Editor2.Text = objRead("right_content").ToString

        End If
        objRead.Close()
        cmd.Dispose()

        strsql = "select * from pages"
        cmd = New SqlCommand(strsql, sqlConn)
        objRead = cmd.ExecuteReader

Dim tdd As CuteEditor.TreeDropDownList

tdd = DirectCast(Editor1.ToolControls("LinkTree").Control, CuteEditor.TreeDropDownList)
tdd.Items.Clear()

        While objRead.Read()
            Dim rootitem As CuteEditor.TreeListItem
            rootitem = New CuteEditor.TreeListItem(objRead("title").ToString, objRead("title").ToString, "~/default.aspx?pageid=" & objRead("id"))
            tdd.Items.Add(rootitem)
        End While
        objRead.Close()

sqlConn.Close()

End Sub

01-25-2006, 3:31 PM 15126 in reply to 15124

Adam
Joined on 09-23-2003
Aurora, ON
Posts 18,678

Re: NullReference when customizing Links ddl

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Where did you call Editor1_Load sub?

Can you post the whole code behind page?

01-25-2006, 3:34 PM 15127 in reply to 15126

kcmonster58
Joined on 01-09-2006
Posts 9

Re: NullReference when customizing Links ddl

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There is ALOT of code in the code behind page. Editor1_Load is automatically called when the editor loads.

01-25-2006, 4:11 PM 15133 in reply to 15127

kcmonster58
Joined on 01-09-2006
Posts 9

Re: NullReference when customizing Links ddl

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Figured it out....the editor was reading its config file after my code ran.

Looks like the best time to do this in on the Editor1_Initialized event.