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Creating Tree View
- Thread starter NeilV
- Start date
![[bluegreedy]](/data/assets/smilies/bluegreedy.gif "[bluegreedy] [bluegreedy]")
Neil: Seems the TreeView Control would be a good approach. Here's some example code from a reference I have; perhaps it can help.
SimpleTreeView.aspx
<%@Import Namespace = "System.Web.UI.HtmlControls"%>
<%@ Register TagPrefix="IE" Namespace="Web.UI.WebControls"%>
Assembly="Microsoft.Web.UI.WebControls" %>
<html>
<head><title>...</title></head>
<body>
<form runat="server">
<IE:TreeView
Runat="server">
<TreeNode 'imports MS.Web.UI.WebControls Namespace
Runat="server">
<TreeNode
Text="Invertebrates">
<TreeNode
Text="Vertebrates">
<TreeNode
Text="Plants">
<TreeNode
Text="Algae">
</TreeNode>
</ID:TreeView>
</form>
</body>
</html>
TreeView is not part of the core ASP.NET Framework, so the namespace must be explicitly imported to refer to classes in the IE WebControls assembly.
IE Tag prefix is registered for the IE WebControls. Registering the prefix maps the prefix to the proper namespace for the controls.
If you want to detect when users select a particular node, you need to capture the SelectedIndexChanged event. Here's some more example code which demonstrates a subroutine associated with this event.
TreeViewSelectedIndexChanged.aspx
<%@....%> etc
<Script runat="server">
Sub TreeView_SelectedIndexChanged (s As Object, e As TreeViewSelectEventArgs)
lblSelectedNode.Text = treeBooks.GetNodeFromIndex(e.NewNode).Text
End Sub
</script>
<html>
.....
<form runat="server">
<IE:TreeView
id="treeBooks"
AutoPostBack="true"
OnSelectedIndexChanged="TreeView_SelectedIndexChanged"
Runat="server">
<TreeNode
Text="ASP.NET Books">
<TreeView
Text="ASP.NET Unleased" />
<TreeView
Text="ASP Tips, Code" />
</TreeNode>
</IE:TreeView>
<p>
<asp:Label id="lblSelectNode"
Runat="server" />
</form>
...
</html>
...from S. Walther (good reference)
SimpleTreeView.aspx
<%@Import Namespace = "System.Web.UI.HtmlControls"%>
<%@ Register TagPrefix="IE" Namespace="Web.UI.WebControls"%>
Assembly="Microsoft.Web.UI.WebControls" %>
<html>
<head><title>...</title></head>
<body>
<form runat="server">
<IE:TreeView
Runat="server">
<TreeNode 'imports MS.Web.UI.WebControls Namespace
Runat="server">
<TreeNode
Text="Invertebrates">
<TreeNode
Text="Vertebrates">
<TreeNode
Text="Plants">
<TreeNode
Text="Algae">
</TreeNode>
</ID:TreeView>
</form>
</body>
</html>
TreeView is not part of the core ASP.NET Framework, so the namespace must be explicitly imported to refer to classes in the IE WebControls assembly.
IE Tag prefix is registered for the IE WebControls. Registering the prefix maps the prefix to the proper namespace for the controls.
If you want to detect when users select a particular node, you need to capture the SelectedIndexChanged event. Here's some more example code which demonstrates a subroutine associated with this event.
TreeViewSelectedIndexChanged.aspx
<%@....%> etc
<Script runat="server">
Sub TreeView_SelectedIndexChanged (s As Object, e As TreeViewSelectEventArgs)
lblSelectedNode.Text = treeBooks.GetNodeFromIndex(e.NewNode).Text
End Sub
</script>
<html>
.....
<form runat="server">
<IE:TreeView
id="treeBooks"
AutoPostBack="true"
OnSelectedIndexChanged="TreeView_SelectedIndexChanged"
Runat="server">
<TreeNode
Text="ASP.NET Books">
<TreeView
Text="ASP.NET Unleased" />
<TreeView
Text="ASP Tips, Code" />
</TreeNode>
</IE:TreeView>
<p>
<asp:Label id="lblSelectNode"
Runat="server" />
</form>
...
</html>
...from S. Walther (good reference)
- Thread starter
- #3
Thanks for your help! However, I am getting a parser error, which i can't figure out...
the error is:
"File or assembly name Microsoft.Web.UI.WebControls, or one of its dependencies, was not found."
And it refers to:
"<%@Import Namespace = "System.Web.UI.HtmlControls"%>
<%@Register TagPrefix="IE" Namespace="Web.UI.WebControls" Assembly="Microsoft.Web.UI.WebControls"%>"
Any suggstions as to what this could be?
Neil
the error is:
"File or assembly name Microsoft.Web.UI.WebControls, or one of its dependencies, was not found."
And it refers to:
"<%@Import Namespace = "System.Web.UI.HtmlControls"%>
<%@Register TagPrefix="IE" Namespace="Web.UI.WebControls" Assembly="Microsoft.Web.UI.WebControls"%>"
Any suggstions as to what this could be?
Neil
- Thread starter
- #4
- Thread starter
- #7
roadrnr,
To install them i had to first download them from:
I selected the automatic install option and it did all the setup automatically. Obviously, this needs to be done on your webserver.
Hope that helps,
Neil
To install them i had to first download them from:
I selected the automatic install option and it did all the setup automatically. Obviously, this needs to be done on your webserver.
Hope that helps,
Neil
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