Maintaining scroll position of page

[Avinash]

Hi,
I am using rad tree view within asp.net page. In page i have set the MaintainScrollPositionOnPostback="true". But when i expand the tree, scroll position goes to expanded item. I want my page's scroll position to remain same. Let me know how can i fix this.

Thanks,

[Nikolay Tsenkov]

Hi Avinash,

Well, MaintainScrollPositionOnPostback is used in situations you actually want to persist position regarding last action. For example, you scroll down the tree and edit it's last item, but as it happens the handler of the NodeEdit event is on the server and the page postbacks. Without MaintainScrollPositionOnPostback set to true, the page will have the default scroll position.

A solution to your problem would be either:
1. to stop MaintainScrollPositionOnPostback;
2. if you need non-default scrollPosition, you can persist the position in cookie and on pageLoad (or even better on ClientLoad event of the TreeView) to restore it.

Hope this is helpful for you!


Regards,
Nikolay Tsenkov
the Telerik team

[Ayush]

Hello,

Am using Rad Tree view and everything works fine but am facing problem in expand and collapse.
Whenever the page loads the treeview automatically collapse so the user is confused ?

[Shinu]

Hi Ayush,

I guess that you are Expanding the RadTreeNode from server side. Please have a look into the sample code snippet which works fine at my end.

ASPX:

<telerik:RadTreeView ID="RadTreeView1" runat="server">
    <Nodes>
        <telerik:RadTreeNode Text="Node1" runat="server">
            <Nodes>
                <telerik:RadTreeNode Text="Node1.1" runat="server">
                </telerik:RadTreeNode>
                <telerik:RadTreeNode Text="Node1.2" runat="server">
                </telerik:RadTreeNode>
                <telerik:RadTreeNode Text="Node1.3" runat="server">
                </telerik:RadTreeNode>
            </Nodes>
        </telerik:RadTreeNode>
        <telerik:RadTreeNode Text="Node2" runat="server">
            <Nodes>
                <telerik:RadTreeNode Text="Node2.1" runat="server">
                </telerik:RadTreeNode>
                <telerik:RadTreeNode Text="Node2.2" runat="server">
                </telerik:RadTreeNode>
                <telerik:RadTreeNode Text="Node2.3" runat="server">
                </telerik:RadTreeNode>
            </Nodes>
        </telerik:RadTreeNode>
    </Nodes>
</telerik:RadTreeView>

C#:

protected void Page_Load(object sender, EventArgs e)
{
    RadTreeNode node = RadTreeView1.FindNodeByText("Node1");
    node.Expanded = true;
}

Please elaborate your requirement if it doesn't help.
Thanks,
Shinu.

[Ayush]

Hello Shinu,

In my case the data is coming from database I have not created any node in designer page.

Thanks,

[Shinu]

Hi Ayush,

Please have a look into the following code snippet which works as expected for me.

C#:

protected void Page_Load(object sender, EventArgs e)
{
    SqlDataAdapter adapter = new SqlDataAdapter("SELECT * FROM Details", ConfigurationManager.ConnectionStrings["NorthwindConnectionString"].ConnectionString);
    DataTable data = new DataTable();
    adapter.Fill(data);
    RadTreeView1.DataSource = data;
    RadTreeView1.DataTextField = "text";
    RadTreeView1.DataFieldParentID = "parentid";
    RadTreeView1.DataFieldID = "id";
    RadTreeView1.DataBind();
    RadTreeNode node = RadTreeView1.FindNodeByText("Politics");
    node.Expanded = true;
}

Let me know if you have any concern.
Thanks,
Shinu.