populating treeview - .NET Framework

Mike

Hi all,

I have a dataset that contains following records:

id ref_id level
--------------------------------------
A - 0
A1 A 1
A2 A 1
A3 A 1
A11 A1 2
A12 A1 2
A21 A2 2
A31 A3 2
A211 A21 3

The column 'ref_id' is supposed to be the parent/referrer of column 'id'
That means:
A refers A1,A2 and A3
A1 refers A11,A12
and so on.

What I want to achieve is to present the above dataset using a treeview in
an ASP.NET 2.0 (VB) page, so it will displays like this:

[+] A
[+] A1
A11
A12
[+] A2
[+] A21
A211
[+] A3
A31

Can somebody please show me how to do this?

Many thanks in advance,
Mike

May 31 '06 #1

Subscribe Reply

1356

gmiley

I would suggest creating possibly a class and two methods.

The class would basically represent each of your nodes we can call it
HtmlTreeNode probably with a ChildNodes property which holds a
collection of other HtmlTreeNodes and a ToHtml() method to create the
html representation of the contained data.

This could look like:

public class HtmlTreeNode
{
HtmlTreeNode[] _childNodes;
public HtmlTreeNode()
{
_childNodes = new HtmlTreeNode[];
}
public HtmlTreeNode[] ChildNodes
{
get { return _childNodes; }
set { _childNodes = value; }
}
public string ToHtml()
{
// This would create the Html output of this node, and its ChildNodes
}
}

Then for the other methods (which you could build into the class if you
want) - the first method would be something like:

HtmlTreeNode[] GetRootNodes()
{
//...
}

The second would be:

HtmlTreeNode[] GetChildNodes()
{
//...
}

The GetChildNodes() could recursively call itself to get all of the
subsequent children all the way down.

Sorry that this is in C# but you should be able to get the basic idea I
hope. If not let me know and I can try to redo it in VB, I just think
faster in C# since that's about all I use these days. =)

Hope that helps.

Mike wrote:

Hi all,

I have a dataset that contains following records:

id ref_id level
--------------------------------------
A - 0
A1 A 1
A2 A 1
A3 A 1
A11 A1 2
A12 A1 2
A21 A2 2
A31 A3 2
A211 A21 3

The column 'ref_id' is supposed to be the parent/referrer of column 'id'
That means:
A refers A1,A2 and A3
A1 refers A11,A12
and so on.

What I want to achieve is to present the above dataset using a treeview in
an ASP.NET 2.0 (VB) page, so it will displays like this:

[+] A
[+] A1
A11
A12
[+] A2
[+] A21
A211
[+] A3
A31

Can somebody please show me how to do this?

Many thanks in advance,
Mike

------=_NextPart_000_ 0071_01C684EC.1 E0F8640
Content-Type: text/html; charset=iso-8859-1
Content-Transfer-Encoding: quoted-printable
X-Google-AttachSize: 2497

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=Content-Type content="text/html; charset=iso-8859-1">
<META content="MSHTML 6.00.2900.2873" name=GENERATOR>
<STYLE></STYLE>
</HEAD>
<BODY bgColor=#ffffff >
<DIV>Hi all, I have a dataset that contains following
records: id     &nb sp;  
ref_id &nb sp;     &nb sp;
level -------------------------------------- A &nbs p;  & nbsp; &nbs p;
-  &nb sp;     &nb sp;     &nb sp;  
0 A1 &n bsp; &nbsp ;  
A  &n bsp; &nbsp ;  &n bsp; &nbsp ;  &n bsp;
1 A2 &n bsp; &nbsp ;  
A  &n bsp; &nbsp ;  &n bsp; &nbsp ;  &n bsp;
1 A3 &n bsp; &nbsp ;  
A  &n bsp; &nbsp ;  &n bsp; &nbsp ;  &n bsp;
1 A11 & nbsp; &nbs p;
A1  & nbsp; &nbs p;  & nbsp; &nbs p;  
2 A12 & nbsp; &nbs p;
A1  & nbsp; &nbs p;  & nbsp; &nbs p;  
2 A21 & nbsp; &nbs p;
A2  & nbsp; &nbs p;  & nbsp; &nbs p;  
2 A31 & nbsp; &nbs p;
A3  & nbsp; &nbs p;  & nbsp; &nbs p;  
2 A211   
A21     &nb sp;     &nb sp; 3 The
column 'ref_id' is supposed to be the parent/referrer of column 'id' That
means: A refers A1,A2 and A3 A1 refers A11,A12 and so on. What I
want to achieve is to present the above dataset using a treeview in an
ASP.NET 2.0 (VB) page, so it will displays like this: [+]
A  &nbs p;  [+]
A1  &nb sp;     &nb sp;  
A11  &n bsp; &nbsp ;  &n bsp; &nbsp ;
A12  &n bsp;  [+]
A2  &nb sp;     &nb sp;  [+]
A21  &n bsp; &nbsp ;  &n bsp; &nbsp ;  &n bsp; &nbsp ;
A211  & nbsp;  [+]
A3  &nb sp;     &nb sp;  A31 Can somebody
please show me how to do this? Ma ny thanks in
advance, Mik e </DIV></BODY></HTML>

------=_NextPart_000_ 0071_01C684EC.1 E0F8640--

May 31 '06 #2

Mike

Hi there,

Thanks for the suggestion. I'll try it out, and come back to you with the
results.
Anyway, thanks a lot. I appreciate it.

Regards,
Mike

"gmiley" <gm****@gmail.c om> wrote in message
news:11******** *************@u 72g2000cwu.goog legroups.com...

I would suggest creating possibly a class and two methods.

The class would basically represent each of your nodes we can call it
HtmlTreeNode probably with a ChildNodes property which holds a
collection of other HtmlTreeNodes and a ToHtml() method to create the
html representation of the contained data.

This could look like:

public class HtmlTreeNode
{
HtmlTreeNode[] _childNodes;
public HtmlTreeNode()
{
_childNodes = new HtmlTreeNode[];
}
public HtmlTreeNode[] ChildNodes
{
get { return _childNodes; }
set { _childNodes = value; }
}
public string ToHtml()
{
// This would create the Html output of this node, and its ChildNodes
}
}

Then for the other methods (which you could build into the class if you
want) - the first method would be something like:

HtmlTreeNode[] GetRootNodes()
{
//...
}

The second would be:

HtmlTreeNode[] GetChildNodes()
{
//...
}

The GetChildNodes() could recursively call itself to get all of the
subsequent children all the way down.

Sorry that this is in C# but you should be able to get the basic idea I
hope. If not let me know and I can try to redo it in VB, I just think
faster in C# since that's about all I use these days. =)

Hope that helps.

Mike wrote:
Hi all,

I have a dataset that contains following records:

id ref_id level
--------------------------------------
A - 0
A1 A 1
A2 A 1
A3 A 1
A11 A1 2
A12 A1 2
A21 A2 2
A31 A3 2
A211 A21 3

The column 'ref_id' is supposed to be the parent/referrer of column 'id'
That means:
A refers A1,A2 and A3
A1 refers A11,A12
and so on.

What I want to achieve is to present the above dataset using a treeview
in
an ASP.NET 2.0 (VB) page, so it will displays like this:

[+] A
[+] A1
A11
A12
[+] A2
[+] A21
A211
[+] A3
A31

Can somebody please show me how to do this?

Many thanks in advance,
Mike

------=_NextPart_000_ 0071_01C684EC.1 E0F8640
Content-Type: text/html; charset=iso-8859-1
Content-Transfer-Encoding: quoted-printable
X-Google-AttachSize: 2497

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=Content-Type content="text/html; charset=iso-8859-1">
<META content="MSHTML 6.00.2900.2873" name=GENERATOR>
<STYLE></STYLE>
</HEAD>
<BODY bgColor=#ffffff >
<DIV>Hi all, I have a dataset that contains following
records: id     &nb sp;  
ref_id &nb sp;     &nb sp;
level -------------------------------------- A &nbs p;  & nbsp; &nbs p;
-  &nb sp;     &nb sp;     &nb sp;  
0 A1 &n bsp; &nbsp ;  
A  &n bsp; &nbsp ;  &n bsp; &nbsp ;  &n bsp;
1 A2 &n bsp; &nbsp ;  
A  &n bsp; &nbsp ;  &n bsp; &nbsp ;  &n bsp;
1 A3 &n bsp; &nbsp ;  
A  &n bsp; &nbsp ;  &n bsp; &nbsp ;  &n bsp;
1 A11 & nbsp; &nbs p;
A1  & nbsp; &nbs p;  & nbsp; &nbs p;  
2 A12 & nbsp; &nbs p;
A1  & nbsp; &nbs p;  & nbsp; &nbs p;  
2 A21 & nbsp; &nbs p;
A2  & nbsp; &nbs p;  & nbsp; &nbs p;  
2 A31 & nbsp; &nbs p;
A3  & nbsp; &nbs p;  & nbsp; &nbs p;  
2 A211   
A21     &nb sp;     &nb sp;
3 The
column 'ref_id' is supposed to be the parent/referrer of column
'id' That
means: A refers A1,A2 and A3 A1 refers A11,A12 and so
on. What I
want to achieve is to present the above dataset using a treeview in an
ASP.NET 2.0 (VB) page, so it will displays like this: [+]
A  &nbs p;  [+]
A1  &nb sp;     &nb sp;  
A11  &n bsp; &nbsp ;  &n bsp; &nbsp ;
A12  &n bsp;  [+]
A2  &nb sp;     &nb sp;  [+]
A21  &n bsp; &nbsp ;  &n bsp; &nbsp ;  &n bsp; &nbsp ;
A211  & nbsp;  [+]
A3  &nb sp;     &nb sp;  A31 Can
somebody
please show me how to do this? Ma ny thanks in
advance, Mik e </DIV></BODY></HTML>

------=_NextPart_000_ 0071_01C684EC.1 E0F8640--

Jun 2 '06 #3

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