Resizing asp:panel on the fly

Hi All,

I'm busy with a web component. This component will consist of a aps:panel and a table which gets generated from some DB data ...

I'm using the panel's OVERFLOW function to resize to either full or partial view ...

I have a problem now. The panel is high enough to display about 10 DBase rows at a time without scrolling ...
obviously if I change the CSS then this number might change.

The problem is that sometimes I will only have 1 or 2 rows in the table and displaying the table with space for ten rows is a waste ... I would therefore be able to change the height of the panel depending on how many rows I have displayed and when i reach 10 rows then it will automatically scroll ...

I need to do this on the fly as if someone changes the CSS I will not be able to hardcode the size in pixels of each row displayed ...

Any help appreciated
Who is Participating?
PraesidiumConnect With a Mentor Commented:
Let me show you an easier way to handle this.  First, get your data, and databind it of course...  

Something like:

private void Indicators_ItemDataBound(object sender, RepeaterItemEventArgs e) {
      HyperLink navTo = (HyperLink)e.Item.FindControl("NavTo");
      Literal title = (Literal)e.Item.FindControl("Title");
      Literal descfinal = (Literal)e.Item.FindControl("Description");
      title.Text = item.SelectSingleNode("title", this.nsmanager).InnerText;
      description = item.SelectSingleNode("description", this.nsmanager).InnerText;
      link = item.SelectSingleNode("link", this.nsmanager).InnerText;

      string pardesc = description.Substring(0, maxChars);

      descfinal.Text = pardesc;
      navTo.NavigateUrl = link;

This example is binding an XML document I retrieved to a repeater named Indicators.  In the page, the repeater should look like this:

<asp:Repeater Runat="server" ID="Indicators">
<asp:HyperLink Runat="server" Target="_blank" ID="NavTo">
<asp:Literal Runat="server" id="Title"/>
<asp:Literal Runat="server" id="Description"/>

Even though each item in the repeater does not have a unique ID, the framework will allow it in this circumstance.  You can do a table by specifying
<td>Data Literal</td>

And you can even get more creative, creating 2 columns using the alternatingitemtemplate etc.  This way the data that you pull will be a dynamic size based on the amount of data output, instead of writing a table statically.

I think you will have alot more success using this method.  Additionally, if you use an asp:datagrid, it will do it's own paging, and that eliminates another step, though it's a very expensive operation.    
Define the contents of the label in code...  this.LabelName.Text = myDynamicText;  Or alternatively, use a repeater, and bind your DB results to the repeater, this way your height resizes dynamically based on the amount of data.  
Pete2003Author Commented:
ok I think I kind of understand it :)

Could you possible throw in some pseudo-code here ...

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Pete2003Author Commented:
Ok .. I see the repeater example but I'm not usre if I understand how it's going to let me grow or shrik the panel, as this still does not give me an indication of the size of the rows
Pete2003Author Commented:
Let me explain in a little more detail :

I have a panel on an aspx page:

<asp:Panel id="Panel1" style="Z-INDEX: 101; LEFT: 0px; POSITION: absolute; TOP: 0px"
      runat="server" Width="760px" Height="195px"></asp:Panel>

As you can see it has a set height:

I now add an arbitrary number of tables to the panel



string sHTML = "<table>";
  sHTML = "<TR><TD>HELLO</TD></TR>";
sHTML += "</table>";

Panel1.Controls.Add( new LiteralControl(sHTML));

Now depending on 'n' there will be more or less rows in the table .. I'd like to adjust the height of the panel accordingly
Remove the static height tag, and in your style tag use height:auto;  That should solve your issue.  
Pete2003Author Commented:
hmm .. that sounds like a plan .. will try it 1st thing tomorrow ...
Pete2003Author Commented:
It doesn't work ... it puts all the panels on top of each other ... I also already have overflow:auto set
Can you post your entire code, including your data binding?  
Pete2003Author Commented:
--- The Control:
<%@ Control Language="c#" AutoEventWireup="false" Codebehind="formDataDisplay.ascx.cs" Inherits="proggie.formDataDisplay" TargetSchema=""%>
<DIV style="WIDTH: 760px;POSITION: relative;HEIGHT: 220px" ms_positioning="GridLayout">
      <asp:Panel id="tablePanel" style="Z-INDEX: 101; LEFT: 0px; OVERFLOW: auto; POSITION: absolute; TOP: 0px;HEIGHT:195;WIDTH:760px"
      <asp:Button id="btnFirst" style="Z-INDEX: 102; LEFT: 0px; POSITION: absolute; TOP: 196px" runat="server"
            Width="25px" Height="24px" Text="<<" Visible="False"></asp:Button>
      <asp:Button id="btnPrev" style="Z-INDEX: 103; LEFT: 32px; POSITION: absolute; TOP: 196px" runat="server"
            Width="25px" Height="24px" Text="<" Visible="False"></asp:Button>
      <asp:Button id="btnNext" style="Z-INDEX: 104; LEFT: 76px; POSITION: absolute; TOP: 196px" runat="server"
            Width="25px" Height="24px" Text=">" Visible="False"></asp:Button>
      <asp:Button id="btnLast" style="Z-INDEX: 105; LEFT: 108px; POSITION: absolute; TOP: 196px" runat="server"
            Width="25px" Height="24px" Text=">>" Visible="False"></asp:Button>
      <asp:Button id="btnToggleView" style="Z-INDEX: 106; LEFT: 712px; POSITION: absolute; TOP: 196px"
            runat="server" Width="47px" Height="24px" Text="Form" Visible="False"></asp:Button>

--- The component data population:
sHTML.Append("<table class=\"color-border\"  border=\"0\" cellpadding=\"2\" cellspacing=\"1\" width=\"100%\">");
string sValue = "";
int nIdx = 0;
for(nIdx = 0; nIdx < 5; nIdx++)  ***** See Note
sHTML.Append("<tr class=\"color-row\">");
sHTML.Append("<td class=\"color-header\" nowrap width=\"200\">Col Desc</td>");
sHTML.Append("<td class=\"label\" nowrap>Value:"+nIdx+"</td>");

The Page:

Control c1 = LoadControl("formCtrl.ascx");


for(n = 0; nTableIdx < 3; n ++)
Control c2 = LoadControl("formCtrl.ascx");


***** Note: The value 5 in this case could change with each component being loaded ... so therefore each componentl colud have more or less then 5 rows .. I now want to resize the panel/div to the number of rows ...
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