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[CLOSED] Trying to access a control with 'X.GetCmp<TreePanel>("TreePanel1")' when I added it dynamically

  1. #1
    Jul 24, 2012, 5:42 PM

    [CLOSED] Trying to access a control with 'X.GetCmp<TreePanel>("TreePanel1")' when I added it dynamically

    I added a TreePanel form the code behind like the snippet below:

    .cs
     protected void Page_Load(object sender, EventArgs e)
{
            var tree = new TreePanel();
            PlaceHolder1.Controls.Add(tree);
            tree.ID = "TreePanel1";
            ...
}
    .aspx
           <asp:PlaceHolder ID="PlaceHolder1" runat="server" />

    I CAN'T access 'TreePanel1' with the code below, is 'null'
    var tree = X.GetCmp<TreePanel>("TreePanel1").GetSelectionModel();
    Last edited by Daniil; Jul 31, 2012 at 12:43 PM. Reason: [CLOSED]
  2. #2
    Jul 24, 2012, 10:12 PM
    Hi,

    I have discovered that the following example causes a JavaScript error.
    TypeError: this.node is null
    Example
    <%@ Page Language="C#" %>

<%@ Register Assembly="Ext.Net" Namespace="Ext.Net" TagPrefix="ext" %>

<script runat="server">
    protected void Page_Load(object sender, EventArgs e)
    {
        var tree = new TreePanel();
        tree.Root.Add(new Node());
        tree.ID = "TreePanel1";
        this.Controls.Add(tree);
    }
</script>

<!DOCTYPE html>

<html>
<head runat="server">
    <title>Ext.NET v2 Example</title>
</head>
<body>
    <ext:ResourceManager runat="server" />
</body>
</html>
    Could you confirm?

    Anyways, we are investigating the issue.

    Regarding this:
    var tree = X.GetCmp<TreePanel>("TreePanel1").GetSelectionModel();
    It won't work, because X.GetCmp just returns a TreePanel proxy. It knows nothing about its selection model.

    In your case since you recreate a control every request, you can just find the real TreePanel control.

    Example
    protected void GetCount(object sender, DirectEventArgs e)
{
    TreePanel tree = Ext.Net.Utilities.ControlUtils.FindControl<TreePanel>(this, "TreePanel1");
    TreeSelectionModel sm = (tree.GetSelectionModel() as TreeSelectionModel);
    int count = 0;

    if (sm.SelectedNodes != null)
    {
        count = sm.SelectedNodes.Count;
    }

    X.Msg.Alert("Selected nodes", count).Show();
}
  3. #3
    Jul 25, 2012, 9:00 PM
    Yip, it DOES cause an error
    "Microsoft JScript runtime error: 'this.node' is null or not an object"

    Thanks, that works for me.

    Quote Originally Posted by Daniil View Post
    Hi,

    I have discovered that the following example causes a JavaScript error.
    TypeError: this.node is null
    Example
    <%@ Page Language="C#" %>

<%@ Register Assembly="Ext.Net" Namespace="Ext.Net" TagPrefix="ext" %>

<script runat="server">
    protected void Page_Load(object sender, EventArgs e)
    {
        var tree = new TreePanel();
        tree.Root.Add(new Node());
        tree.ID = "TreePanel1";
        this.Controls.Add(tree);
    }
</script>

<!DOCTYPE html>

<html>
<head runat="server">
    <title>Ext.NET v2 Example</title>
</head>
<body>
    <ext:ResourceManager runat="server" />
</body>
</html>
    Could you confirm?

    Anyways, we are investigating the issue.

    Regarding this:
    var tree = X.GetCmp<TreePanel>("TreePanel1").GetSelectionModel();
    It won't work, because X.GetCmp just returns a TreePanel proxy. It knows nothing about its selection model.

    In your case since you recreate a control every request, you can just find the real TreePanel control.

    Example
    protected void GetCount(object sender, DirectEventArgs e)
{
    TreePanel tree = Ext.Net.Utilities.ControlUtils.FindControl<TreePanel>(this, "TreePanel1");
    TreeSelectionModel sm = (tree.GetSelectionModel() as TreeSelectionModel);
    int count = 0;

    if (sm.SelectedNodes != null)
    {
        count = sm.SelectedNodes.Count;
    }

    X.Msg.Alert("Selected nodes", count).Show();
}
  4. #4
    Jul 26, 2012, 8:27 AM
    Quote Originally Posted by Fahd View Post
    Yip, it DOES cause an error
    "Microsoft JScript runtime error: 'this.node' is null or not an object"
    Thanks for confirmation! We are investigating.
  5. #5
    Jul 31, 2012, 12:43 PM
    Quote Originally Posted by Daniil View Post
    I have discovered that the following example causes a JavaScript error.
    TypeError: this.node is null
    Example
    <%@ Page Language="C#" %>

<%@ Register Assembly="Ext.Net" Namespace="Ext.Net" TagPrefix="ext" %>

<script runat="server">
    protected void Page_Load(object sender, EventArgs e)
    {
        var tree = new TreePanel();
        tree.Root.Add(new Node());
        tree.ID = "TreePanel1";
        this.Controls.Add(tree);
    }
</script>

<!DOCTYPE html>

<html>
<head runat="server">
    <title>Ext.NET v2 Example</title>
</head>
<body>
    <ext:ResourceManager runat="server" />
</body>
</html>
    it has been fixed in SVN.
  6. #6
    Jul 31, 2012, 2:36 PM
    Thank you...

    Quote Originally Posted by Daniil View Post
    it has been fixed in SVN.

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