Question

<TBODY> in Table Control

Asked by: arbert

Ok, I know that .NET 2.0 is going to give us the ability to assign a "TableSection" property to a row on the table control.

But until then, can someone give me some pointers or ideas on how to get around the limitation of not being able to include <TBODY> tags in the table control.

Basically, we're creating a hierarchy on the fly and we need to hide/display multiple rows at a time within the same table. I have it working beautifully in old ASP with CSS and the VISIBLE property of the ID on the TBODY.

So, we have a list of categories--these should always be visible. Under those is a list of subcategorys--these are only visible when the category is clicked. Under the subcategory is an actual list of selectible options and these are only visible when the subcategory is clicked.

I know we could make the table control postback and make the rows visible/hidden, but I think it's kind of pointless to make another trip to the server.

Thanks
Brett

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Asked On: 2005-06-18 at 18:10:18ID21463018
Tags: tbody
,; table
,; control
Topic: Programming for ASP.NET
Participating Experts: 2
Points: 500
Comments: 9

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Answers

by: HeadspacePosted on 2005-06-18 at 20:53:59ID: 14250569

Rather than using the asp:table control, can you use an html table instead? You can build it in the codebehind using the HtmlGenericControl and LiteralControl classes. once you've built the table, you can either place it inside of another control (e.g. a predefined Panel control) or simply add it directly to the page.

by: amit_gPosted on 2005-06-18 at 23:45:08ID: 14250827

Something like this...

****************************** WebForm5.aspx ******************************

<%@ Page Language="vb" AutoEventWireup="false" Codebehind="WebForm5.aspx.vb" Inherits="WebApplication1.WebForm5"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html>
<head>
<title>WebForm5</title>
<meta name="GENERATOR" content="Microsoft Visual Studio.NET 7.0">
<meta name="CODE_LANGUAGE" content="Visual Basic 7.0">
<meta name=vs_defaultClientScript content="JavaScript">
<meta name=vs_targetSchema content="http://schemas.microsoft.com/intellisense/ie5">
<style>
.Category {
background-color: #CECECE;
}
.SubCategoryHidden {
visibilitiy: hidden;
display: none;
}
.SubCategoryVisible {
visibilitiy: visible;
display: block;
}
</style>
<script language="javascript">
function ShowSubCategories(oThis)
{
var CurrentCategoryIndex = oThis.rowIndex;
var Rows = oThis.parentNode.rows;

for (i = 1 ; i < Rows.length ; i++)
{
Rows[i].className = Rows[i].className.replace("SubCategoryVisible", "SubCategoryHidden");
}

for (i = oThis.rowIndex + 1 ; i < Rows.length ; i++)
{
if (Rows[i].className == "Category")
{
break;
}
else
{
Rows[i].className = "SubCategoryVisible";
}
}
}
</script>
</head>
<body OnLoad="ShowSubCategories(document.getElementById('MyDataGrid').rows[1])">

<form id="MyForm" method="post" runat="server">
<asp:DataGrid ID="MyDataGrid" Runat="server" CellPadding="0" CellSpacing="0" BorderWidth="1"></asp:DataGrid>
</form>

</body>
</html>

****************************** WebForm5.aspx.vb ******************************

Public Class WebForm5
Inherits System.Web.UI.Page
Protected WithEvents MyDataGrid As System.Web.UI.WebControls.DataGrid

#Region " Web Form Designer Generated Code "

'This call is required by the Web Form Designer.
<System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()

End Sub

Private Sub Page_Init(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Init
'CODEGEN: This method call is required by the Web Form Designer
'Do not modify it using the code editor.
InitializeComponent()
End Sub

#End Region

Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
If (Not IsPostBack()) Then
Call BindData()
End If
End Sub

Sub BindData()
Dim MyDataTable As New DataTable()

MyDataTable.Columns.Add("CategoryID", Type.GetType("System.Int32"))
MyDataTable.Columns.Add("CategoryName", Type.GetType("System.String"))
MyDataTable.Columns.Add("SubCategoryID", Type.GetType("System.Int32"))
MyDataTable.Columns.Add("SubCategoryName", Type.GetType("System.String"))

Dim MyDataRow As DataRow
Dim i, j As Int32

For i = 1 To 5
MyDataRow = MyDataTable.NewRow()
MyDataRow.Item("CategoryID") = 100 + i
MyDataRow.Item("CategoryName") = "CategoryName" & (100 + i)
MyDataRow.Item("SubCategoryID") = 0
MyDataRow.Item("SubCategoryName") = ""
Call MyDataTable.Rows.Add(MyDataRow)

For j = 1 To 3
MyDataRow = MyDataTable.NewRow()
MyDataRow.Item("CategoryID") = 100 + i
MyDataRow.Item("CategoryName") = "CategoryName" & (100 + i)
MyDataRow.Item("SubCategoryID") = 1000 + j
MyDataRow.Item("SubCategoryName") = "SubCategoryName" & (1000 + j)
Call MyDataTable.Rows.Add(MyDataRow)
Next
Next

MyDataGrid.DataSource = MyDataTable
Call MyDataGrid.DataBind()
End Sub

Private Sub MyDataGrid_ItemDataBound(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.DataGridItemEventArgs) Handles MyDataGrid.ItemDataBound
If ((e.Item.ItemType = ListItemType.Item) Or (e.Item.ItemType = ListItemType.AlternatingItem)) Then
If (e.Item.DataItem("SubCategoryID") <> 0) Then
e.Item.CssClass = "SubCategoryHidden"
Else
e.Item.CssClass = "Category"
e.Item.Attributes.Add("onclick", "ShowSubCategories(this)")
End If
End If
End Sub
End Class

by: arbertPosted on 2005-06-19 at 09:33:42ID: 14252338

amit, that's pretty cool (I'll add it to my tricks and give you some points), but I really need the table control so I can make it look more hierarchial.

Alas, I think maybe Headspace is correct and I'll have to use a literal.

by: amit_gPosted on 2005-06-19 at 10:49:08ID: 14252567

Could you please post a sample HTML that you are aiming for.

by: arbertPosted on 2005-06-19 at 11:44:42ID: 14252803

Sure, it's a bit messy, but basically the "Kitchen" section has the functionality that I'm going for:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
      <head>
            <title>hide or display trs</title>
            <meta http-equiv="Content-Type" content="application/xhtml+xml; charset=utf-8">
            <style type="text/css">

a:link {
/* Applies to all unvisited links */
text-decoration: none;
font-weight: bold;

color: black;
}
a:visited {
/* Applies to all visited links */
text-decoration: none;
font-weight: bold;

color: darkblue;
}
a:hover {
/* Applies to links under the pointer */
text-decoration: underline;
font-weight: bold;
background-color: blue;
color: #fff;
}
a:active {
/* Applies to activated links */
text-decoration: none;
font-weight: bold;
background-color: black;
color: white;
}

#container {
width:260px;
margin:20px auto;
}
#tbl {
font-family:verdana,arial,helvetica,sans-serif;
font-size:20px;

border:inset 6px #666;
}
#tbl td {
width:82px;
height:50px;
border:solid 1px #000;
text-align:center;
line-height:50px;
}

/*//]]>*/
            </style>
            <script type="text/javascript">
//<![CDATA[
function getdisplay(id){
if (document.getElementById(id).style.display=='block') {
document.getElementById(id).style.display='none'
document.getElementById('bath2').checked=false ;
document.getElementById('kitchen2').checked=false ;
}
}

function hideShow(id) {

if(document.getElementById(id).style.display=="none") {
document.getElementById(id).style.display="block";

}
else {
document.getElementById(id).style.display="none";

}

}

//]]>
            </script>
      </head>
      <body onload="hideShow('tr0');hideShow('tr11');hideShow('bathroom');hideShow('kitchen')">
      <form name="order">
            <table id="tbl3" cellSpacing="0" cellPadding="0" width="80%" border="0">
                  <tr bgColor="lightskyblue">
                        <a onclick="getdisplay('bathroom');getdisplay('kitchen');hideShow('tr0');hideShow('tr11');return false;" href="">Windows</a>
                  </tr>
                  <tr id="tr0">
                        <td>    <INPUT onclick="hideShow('bathroom')" type="checkbox" id="bath2"><b> Bath</b></td>
                  </tr>
                  <tbody id="bathroom">
                        <tr>
                             <td>        <input type="radio" name="rad1">30"
                                    x 48" Vertical Safety: Over Oasis Tub 100 Series
                              </td>
                        <tr>
                              <td>        <input type="radio" name="rad1" ID="Radio1" VALUE="Radio1">46"
                                    x 53" Vertical Safety: Over Oasis Tub</td>
                        <tr>
                              <td>        <input type="radio" name="rad1" ID="Radio2" VALUE="Radio2">30"
                                    x 40" Vertical</td>
                        <tr>
                              <td>        <input type="radio" name="rad1" ID="Radio3" VALUE="Radio2">14"
                                    x 40" Veritcal</td>
                        </tr>
                  </tbody>
                  <tr id="tr11">
                        <td>    <input onclick="hideShow('kitchen')" type="checkbox" name="Checkbox1" id="kitchen2"> <b>Kitchen</b></td>
                  </tr>
                  <tbody id="kitchen">
                        <tr>
                              <td>        <input type="radio" name="Radio3">30"
                                    x 40" Vertical</td>
                        <tr>
                              <td>        <input type="radio" CHECKED value="Radio4" name="Radio3">46"
                                    x 40" Vertical</td>
                        <tr>
                              <td>        <input type="radio" CHECKED value="Radio4" name="Radio3" ID="Radio4">62"
                                    x 40" Picture with Two Side Verticals</td>
                        </tr>
                  </tbody>
            </table>
            <table id="Table1" cellSpacing="0" cellPadding="0" width="80%" border="0">
                  <tr bgColor="lightskyblue">
                        <a onclick="hideShow('tr0');hideShow('tr11');return false;" href="">Doors</a>
                  </tr>
            </table>
            <input type=hidden name="page">
            </form>
      </body>
</html>

by: HeadspacePosted on 2005-06-19 at 20:42:02ID: 14254219

oooh, that Will be messy! Here's the general idea. I threw the table into a predefined panel, but you can do whatever you like. all of your css code can go in the page as is, or in a stylesheet of course. this also holds for the javascript, unless you'd rather bring it in from the codebehind with RegisterStartupScript or RegisterClientScriptBlock. if you need it in vb.net rather than c#, let me know:

private void Page_Load(object sender, System.EventArgs e) <--- or whatever method you need it in : )
{
      HtmlGenericControl tbl = new HtmlGenericControl("Table");
      tbl.Attributes.Add ("id", "tbl3");
      tbl.Attributes.Add("cellSpacing", "0");
      tbl.Attributes.Add("cellPadding", "0");
      tbl.Attributes.Add("width", "80%");
      tbl.Attributes.Add("border", "0");
      HtmlGenericControl tbody = new HtmlGenericControl("TBODY");
      HtmlGenericControl tr = new HtmlGenericControl("tr");
      tr.Attributes.Add("bgColor", "lightskyblue");
      HtmlGenericControl a = new HtmlGenericControl("a");
a.Attributes.Add("onclick", "getdisplay('bathroom');getdisplay('kitchen');hideShow('tr0');" +
"hideShow('tr11');return false;\"href=\"\">Windows");
      tr.Controls.Add(a);
      tbody.Controls.Add(tr);
      HtmlGenericControl td = new HtmlGenericControl("td");
      LiteralControl lt = new LiteralControl("Literal Control!");
      td.Controls.Add(lt);
      tr = new HtmlGenericControl("tr");
      tr.Controls.Add(td);
      tbody.Controls.Add(tr);
      tbl.Controls.Add(tbody);
      panel1.Controls.Add(tbl);
}

by: arbertPosted on 2005-06-19 at 21:07:42ID: 14254267

"oooh, that Will be messy! "

Thanks for that--glad I'm not the only one that thought that :) I will say, .NET does make a lot of things really easy. Conversely, there are definately some things that are easier (granted messier to maintain) to do in good old ASP.

I'll take a look at your snippet tomorrow headspace--looks good though.

by: amit_gPosted on 2005-06-20 at 01:29:04ID: 14254995

>>Conversely, there are definately some things that are easier (granted messier to maintain) to do in good old ASP.

True but we could still use asp.net as simple asp :) Generally there is a way to do things that could have been done in ASP. Sometimes the way is difficult to find as we still have long way to come out of asp shell.

Here is the modified version. I am not saying that you must use DataGrid but just wanted to demonstrate that DataGrid can also do the same thing although in a "messy way". Which way is less messy is for you to decide :)

<%@ Page Language="vb" AutoEventWireup="false" Codebehind="WebForm5.aspx.vb" Inherits="WebApplication1.WebForm5"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html>
<head>
<title>WebForm5</title>
<meta name="GENERATOR" content="Microsoft Visual Studio.NET 7.0">
<meta name="CODE_LANGUAGE" content="Visual Basic 7.0">
<meta name=vs_defaultClientScript content="JavaScript">
<meta name=vs_targetSchema content="http://schemas.microsoft.com/intellisense/ie5">
<style>
.Category {
            background-color: #CECECE;
}
.SubCategoryHidden {
            visibilitiy: hidden;
            display: none;
            background-color: #FFEEEE;
}
.SubCategoryVisible {
            visibilitiy: visible;
            display: block;
            background-color: #FFEEEE;
}
.Sub2CategoryHidden {
            visibilitiy: hidden;
            display: none;
            background-color: #EEFFFF;
}
.Sub2CategoryVisible {
            visibilitiy: visible;
            display: block;
            background-color: #EEFFFF;
}
</style>
<script language="javascript">
function ShowSubCategories(oThis)
{
            var CurrentCategoryIndex = oThis.rowIndex;
            var Rows = oThis.parentNode.rows;

            for (i = 1 ; i < Rows.length ; i++)
            {
                  Rows[i].className = Rows[i].className.replace("SubCategoryVisible", "SubCategoryHidden");
                  Rows[i].className = Rows[i].className.replace("Sub2CategoryVisible", "Sub2CategoryHidden");
            }

            for (i = CurrentCategoryIndex + 1 ; i < Rows.length ; i++)
            {
                  if (Rows[i].className == "Category")
                  {
                        break;
                  }
                  else
                  {
                        Rows[i].className = Rows[i].className.replace("SubCategoryHidden", "SubCategoryVisible");

                        if ((Rows[i].getElementsByTagName("INPUT").length == 1) && (Rows[i].getElementsByTagName("INPUT")[0].type == "checkbox") && (Rows[i].getElementsByTagName("INPUT")[0].checked))
                        {
                              for (j = i + 1 ; j < Rows.length ; j++)
                              {
                                    if (Rows[j].className.indexOf("Sub2Category") == -1)
                                    {
                                          break;
                                    }
                                    else
                                    {
                                          Rows[j].className = "Sub2CategoryVisible";
                                    }
                              }
                        }
                  }
            }
}

function ShowSubSubCategories(oThis)
{
            var CurrentSubCategoryIndex = oThis.parentNode.parentNode.rowIndex;
            var Rows = oThis.parentNode.parentNode.parentNode.rows;

            /*
            for (i = 1 ; i < Rows.length ; i++)
            {
                  Rows[i].className = Rows[i].className.replace("Sub2CategoryVisible", "Sub2CategoryHidden");
            }
            */

            for (i = CurrentSubCategoryIndex + 1 ; i < Rows.length ; i++)
            {
                  if (Rows[i].className.indexOf("Sub2Category") == -1)
                  {
                        break;
                  }
                  else
                  {
                        Rows[i].className = oThis.checked ? "Sub2CategoryVisible" : "Sub2CategoryHidden";
                  }
            }
}
</script>
</head>
<body OnLoad="ShowSubCategories(document.getElementById('MyDataGrid').rows[1])">

<form id="MyForm" method="post" runat="server">
            <asp:DataGrid ID="MyDataGrid" Runat="server" CellPadding="0" CellSpacing="0" BorderWidth="1" AutoGenerateColumns="False">
                  <Columns>
                        <asp:TemplateColumn>
                              <ItemTemplate>
                                    <asp:Label ID="lblCategory" Runat="server" Text='<%# DataBinder.Eval(Container.DataItem, "CategoryName") %>'></asp:Label>
                                         
                                    <asp:CheckBox ID="chkSubCategory" Runat="server" Text='<%# DataBinder.Eval(Container.DataItem, "SubCategoryName") %>'></asp:CheckBox>
                                              
                                    <asp:RadioButton ID="rbtnSubSubCategory" Runat="server" Text='<%# DataBinder.Eval(Container.DataItem, "SubSubCategoryName") %>'></asp:RadioButton>
                              </ItemTemplate>
                        </asp:TemplateColumn>
                        <asp:BoundColumn DataField="CategoryID" Visible="False"></asp:BoundColumn>
                        <asp:BoundColumn DataField="SubCategoryID" Visible="False"></asp:BoundColumn>
                        <asp:BoundColumn DataField="SubSubCategoryID" Visible="False"></asp:BoundColumn>
                  </Columns>
            </asp:DataGrid>
</form>

</body>
</html>

Public Class WebForm5
Inherits System.Web.UI.Page
Protected WithEvents MyDataGrid As System.Web.UI.WebControls.DataGrid

#Region " Web Form Designer Generated Code "

'This call is required by the Web Form Designer.
<System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()

End Sub

Private Sub Page_Init(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Init
'CODEGEN: This method call is required by the Web Form Designer
'Do not modify it using the code editor.
InitializeComponent()
End Sub

#End Region

Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
If (Not IsPostBack()) Then
Call BindData()
End If
End Sub

Sub BindData()
Dim MyDataTable As New DataTable()

MyDataTable.Columns.Add("CategoryID", Type.GetType("System.Int32"))
MyDataTable.Columns.Add("CategoryName", Type.GetType("System.String"))
MyDataTable.Columns.Add("SubCategoryID", Type.GetType("System.Int32"))
MyDataTable.Columns.Add("SubCategoryName", Type.GetType("System.String"))
MyDataTable.Columns.Add("SubSubCategoryID", Type.GetType("System.Int32"))
MyDataTable.Columns.Add("SubSubCategoryName", Type.GetType("System.String"))

Dim MyDataRow As DataRow
Dim i, j, k As Int32

For i = 1 To 5
MyDataRow = MyDataTable.NewRow()
MyDataRow.Item("CategoryID") = 10 + i
MyDataRow.Item("CategoryName") = "CategoryName" & (10 + i)
MyDataRow.Item("SubCategoryID") = 0
MyDataRow.Item("SubCategoryName") = ""
MyDataRow.Item("SubSubCategoryID") = 0
MyDataRow.Item("SubSubCategoryName") = ""
Call MyDataTable.Rows.Add(MyDataRow)

For j = 1 To 3
MyDataRow = MyDataTable.NewRow()
MyDataRow.Item("CategoryID") = 10 + i
MyDataRow.Item("CategoryName") = "CategoryName" & (10 + i)
MyDataRow.Item("SubCategoryID") = 100 + j
MyDataRow.Item("SubCategoryName") = "SubCategoryName" & (100 + j)
MyDataRow.Item("SubSubCategoryID") = 0
MyDataRow.Item("SubSubCategoryName") = ""
Call MyDataTable.Rows.Add(MyDataRow)

For k = 1 To 2
MyDataRow = MyDataTable.NewRow()
MyDataRow.Item("CategoryID") = 10 + i
MyDataRow.Item("CategoryName") = "CategoryName" & (10 + i)
MyDataRow.Item("SubCategoryID") = 100 + j
MyDataRow.Item("SubCategoryName") = "SubCategoryName" & (100 + j)
MyDataRow.Item("SubSubCategoryID") = 1000 + k
MyDataRow.Item("SubSubCategoryName") = "SubSubCategoryName" & (1000 + j)
Call MyDataTable.Rows.Add(MyDataRow)
Next
Next
Next

MyDataGrid.DataSource = MyDataTable
Call MyDataGrid.DataBind()
End Sub

Private Sub MyDataGrid_ItemDataBound(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.DataGridItemEventArgs) Handles MyDataGrid.ItemDataBound
If ((e.Item.ItemType = ListItemType.Item) Or (e.Item.ItemType = ListItemType.AlternatingItem)) Then
If (e.Item.DataItem("SubSubCategoryID") <> 0) Then
e.Item.CssClass = "Sub2CategoryHidden"

e.Item.FindControl("lblCategory").Visible = False
e.Item.FindControl("chkSubCategory").Visible = False
Else
If (e.Item.DataItem("SubCategoryID") <> 0) Then
e.Item.CssClass = "SubCategoryHidden"

e.Item.FindControl("lblCategory").Visible = False
e.Item.FindControl("rbtnSubSubCategory").Visible = False

CType(e.Item.FindControl("chkSubCategory"), CheckBox).Attributes.Add("onclick", "ShowSubSubCategories(this)")
Else
e.Item.CssClass = "Category"

e.Item.FindControl("chkSubCategory").Visible = False
e.Item.FindControl("rbtnSubSubCategory").Visible = False

e.Item.Attributes.Add("onclick", "ShowSubCategories(this)")
End If
End If
End If
End Sub
End Class

by: arbertPosted on 2005-06-20 at 19:20:35ID: 14262469

OMG amit, that's awesome. I toyed around with a template and finally figured it was too rigid to do what I needed--boy was I wrong. This is TOTALLY going to make my job much easier.

I wish we could give more than 500 on a question so I could give you each 500.

I hope nobody is offended by the split.

brett

20120131-EE-VQP-002

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