CODEWITHSUNDEEP
c#asp.neteventstriggerstreeview
TBogdan
TBogdan

Reputation: 737

How to determine if a TreeView.SelectedNode is parent or child node

enter image description hereI have a TreeView control in my ASP.NET web application, and I have problems with the event selected node changed, I click on some node in the treeview but the event doesn't trigger, I have some instructions there that are not executed, I checked with debugger also.

<asp:TreeView ID="ArboreSarcini" runat="server" ImageSet="News" 
onselectednodechanged="ArboreSarcini_SelectedNodeChanged" NodeIndent="10" 
style="z-index: 1; left: 1px; top: 27px; position: absolute; height: 308px; width: 446px">
<HoverNodeStyle Font-Underline="True" BackColor="#99CCCC" Font-Size="12pt" />
<LeafNodeStyle ImageUrl="~/Poze/leaf.png" NodeSpacing="2px" />
<LevelStyles>
<asp:TreeNodeStyle BorderColor="Black" BorderStyle="Solid" BorderWidth="1px" 
Font-Names="Leelawadee" Font-Size="Medium" Font-Underline="False" 
ImageUrl="~/Poze/Root.png" />
<asp:TreeNodeStyle BorderColor="#003300" BorderStyle="Solid" BorderWidth="1px" 
Font-Names="Leelawadee" Font-Underline="False" ImageUrl="~/Poze/node.png" 
Width="400px" />
<asp:TreeNodeStyle BorderColor="#006600" BorderStyle="Solid" BorderWidth="1px" 
Font-Names="Leelawadee" Font-Underline="False" Height="10px" 
ImageUrl="~/Poze/leaf.png" Width="390px" />
</LevelStyles>
<NodeStyle Font-Names="Leelawadee" Font-Size="10pt" ForeColor="Black" 
HorizontalPadding="5px" NodeSpacing="2px" VerticalPadding="0px" 
ImageUrl="~/Poze/node.png" Width="0px" />
<ParentNodeStyle Font-Bold="False" Width="500px" />
<RootNodeStyle ImageUrl="~/Poze/Root.png" />
<SelectedNodeStyle Font-Underline="False" BackColor="#009148" BorderWidth="2px" 
Font-Bold="False" Font-Italic="True" Font-Size="12pt" />
</asp:TreeView>

protected void Button1_Click(object sender, EventArgs e)
{
ArboreSarcini.Nodes.Clear();
populeaza_sarcini();

string sqlstring1 = "Select * from activitati";
System.Data.SqlClient.SqlConnection con1 = new System.Data.SqlClient.SqlConnection(
            "Data Source=BOGDAN-PC\\BOGDAN;Initial Catalog=ePlanning;Integrated Security=SSPI;Connect Timeout=10;TrustServerCertificate=True ");
System.Data.SqlClient.SqlCommand comm1 = new System.Data.SqlClient.SqlCommand(sqlstring1, con1);
System.Data.SqlClient.SqlDataReader reader1;
con1.Open();
reader1 = comm1.ExecuteReader();

while (reader1.Read())
{
foreach (Sarcina s in listaSarcini)
{
    if ((int)reader1["id_sarcina"] == s.Id_sarcina)
    {
        s.ListaActivitati.Add(new Activitate(Convert.ToInt32(reader1["id_activitate"]), reader1["descriere"].ToString()));
    }
}
}

TreeNode tatal = new TreeNode();
tatal.Value = DropListProiecte.SelectedItem.ToString();
//    ArboreSarcini.Nodes.Add(tatal);


TreeNode parentNode = new TreeNode();
foreach (Sarcina sarc in listaSarcini)
{
parentNode = new TreeNode( sarc.Id_sarcina.ToString() + ". " + sarc.Descriere.ToString());


foreach (Activitate act in sarc.ListaActivitati)
{
    TreeNode copil = new TreeNode(act.Id_activitate.ToString()+". "+act.Descriere.ToString() );
    parentNode.ChildNodes.Add(copil);
}
tatal.ChildNodes.Add(parentNode);
//parentNode.Collapse();


}
ArboreSarcini.Nodes.Add(tatal);
con.Close();
ArboreSarcini.ExpandAll();
}


    protected void ArboreSarcini_SelectedNodeChanged(object sender, EventArgs e)
{

    if (ArboreSarcini.SelectedNode.ImageUrl == "~/Poze/node.png")
    {

        System.Data.SqlClient.SqlConnection con = new System.Data.SqlClient.SqlConnection(
                      "Data Source=BOGDAN-PC\\BOGDAN;Initial Catalog=ePlanning;Integrated Security=SSPI;Connect Timeout=10;TrustServerCertificate=True ");
        //  string de_splituit = ArboreSarcini.SelectedNode.Text;
        string[] id_sarcina = ArboreSarcini.SelectedNode.Text.Split('.');


        string sqlstring = "Select * from sarcini where id_sarcina=" + id_sarcina[0] + ";";




        System.Data.SqlClient.SqlCommand comm = new System.Data.SqlClient.SqlCommand(sqlstring, con);
        System.Data.SqlClient.SqlDataReader reader;

        con.Open();
        reader = comm.ExecuteReader();
        while (reader.Read())
        {
            tbIDSarcina.Text = reader["id_sarcina"].ToString();
        }
    }
}

Upvotes: 0

Views: 2136

Answers (1)

kbvishnu
kbvishnu

Reputation: 15630

By default, the TreeView control handles expand-collapse functionality on the client unless the browser does not support client script or the EnableClientScript property is set to false. If the PopulateNodesFromClient property is set to true and the browser supports client script, then the TreeView control retrieves the data from the server without posting the entire page back.

When the TreeView control is in selection mode, each time a user clicks a node, a postback to the server occurs and the SelectedNodeChanged event is raised.

Typically, you should handle postback events when the TreeView control is in selection mode or the nodes are being dynamically populated. This is because either the PopulateOnDemand or PopulateNodesFromClient property is set to true.

So kindly verify that you set all the required properties. Sharing your HTML might helpful. Read more about the asp.net treeview here TreeNode.Nodes Property. Gets the collection of TreeNode objects assigned to the current tree node.

http://msdn.microsoft.com/en-us/library/system.windows.forms.treenode.nodes.aspx

Upvotes: 1

Related Questions