Tree view selected node changed event

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I am having a tree view control and i doing some operation in the selected node changed event.
The event is not firing when i click in the node at runtime. This is the code i am using.
The break point is not getting hit at runtime.

C#

protected void tvData_SelectedNodeChanged(object sender, EventArgs e)
        {
            if (tvData.SelectedNode.Text == "Country")
            {
                tdCtry.Visible = false;
            }
            else
            {
                tdCtry.Visible = true;
            }
        }

Can anyone tell me what needs to be done?

Posted 13-Jun-14 0:42am

Member 10755410

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norbitrial 13-Jun-14 7:54am

Can you post the aspx code for your treeview? Have you set for treeview runat="server"?

Member 10755410 13-Jun-14 8:19am

<asp:TreeView ID="tvData" runat="server" Target="frm" Height="100%"
SkipLinkText="" Font-Bold="True" BorderColor="Black" ShowLines="True"
onselectednodechanged="tvData_SelectedNodeChanged" Width="240px">
<nodestyle font-size="Small">
<SelectedNodeStyle ForeColor="Red" />
<hovernodestyle forecolor="Red">
<leafnodestyle forecolor="Black" font-size="10pt">
<nodes>
<asp:TreeNode Text="Data" Value="Data">
<asp:TreeNode Text="Category" Value="Category">
<asp:TreeNode NavigateUrl="~/Country.aspx" Target="frm" Text="Country" Value="Country">

<asp:TreeNode Text="Sub Category" Value="Sub Category">
<asp:TreeNode NavigateUrl="~/City.aspx" Target="frm" Text="City"
Value="City">

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norbitrial · Answer 1 · 2014-06-13T02:32:00

There are some articles what you can find around this topic. You need to force postback to your TreeView.

You need to create a forcing JavaScript function first:

JavaScript

function forcePostBack() {
    var yourObject = window.event.srcElement;
    if (yourObject .tagName == "INPUT" && yourObject.type == "checkbox") {
           __doPostBack("","");
    } 
}

After in page load method you need to add click event for your TreeView

C#

protected void Page_Load(object sender, EventArgs e)
{
    tvData.Attributes.Add("onclick", "forcePostBack()");
}

After you need to use TreeNodeCheckChanged event instead of SelectedNodeChanged as follow:

C#

protected void tvData_TreeNodeCheckChanged(object sender, TreeNodeEventArgs e)
{
    //in this way easier to set visibility
    tdCtry.Visible = !tvData.SelectedNode.Text.Equals("Country");
}

Please let me know if it's working or not!