Frames in ASP.NET

knagendrak · August 3rd, 2004, 05:31 AM

Hi All!

I am new to the DOT NET.

I am doing a small project in ASP.NET

I have a small problem

Scenario:

I have two frames in my WebForm.
In the first frame i have "Department" which user has to select.
As soon as user selects corresponding Department Employees should be displayed in the Second Frame as soon as user clicks the button in First Frame.

Can anybody help me in this regards

Thanks in advance

Nag

planoie · August 3rd, 2004, 06:08 AM

You need to use javascript to point the other frame. You'll need to generate a hyperlink for each department using whatever method is appropriate for the way you generate the list. Then make the link target the other frame with a querystring value of the department ID.

doctorsom · August 17th, 2004, 10:44 AM

Hello
Your first frame should have an asp:DropDownList control with the onSelectedIndexChanged="someProcedure" and autopostback property set to true. Then put some code in the "someprocedure" to put the selectedItem.value or selectedItem.text to the criterior then navigate to the secon frame.The code should look like this.
Private Sub SomeProcedure()
Response.Redirect("yourResultPage.aspx?Department= '" & YourDropDownList.SelectedItem.Text & "' Target='yourSecondFrame_Id'")
end sub
But you will face some bug of the onselectedIndexCHanged if someone choose the first item nothing will happen.
Because the first time the page load the first item will be chose by default then no index change.The event will not fired.You can set the autopostback to false.Put a submit button then put the samecode inside the onCLick event of this button instead. doctorsom from Thailand

mehdi62b · August 18th, 2004, 05:02 AM

There are other ways without using javascript(& frames)
i.e you could have two repeaters one includes Department another shows details(according another column in ur datasource) then you can Bind second repeater everytime u need according to the first one.
HTH.

--------------------------------------------
Mehdi.:)

mehdi62b · August 18th, 2004, 05:51 AM

Have a look at this example

Code:

<%@ Import Namespace="System.Data.SqlClient" %>

<Script Runat="Server">

Sub Page_Load
  If Not IsPostBack
    BindDataList
  End If
End Sub

Sub BindDataList
  Dim conNorthwind As SqlConnection
  Dim cmdSelect As SqlCommand
  Dim dtrCategories As SqlDataReader

  conNorthwind = New SqlConnection( "Server=localhost;UID=sa;PWD=secret;Database=Northwind" )
  cmdSelect = New SqlCommand( "Select CategoryID, CategoryName From Categories", conNorthwind )
  conNorthwind.Open()
  dtrCategories = cmdSelect.ExecuteReader()

  dlstCategories.DataSource = dtrCategories
  dlstCategories.DataBind()

  dtrCategories.Close()
  conNorthwind.Close()
End Sub

Sub BindRepeater( intCatID As Integer )
  Dim conNorthwind As SqlConnection
  Dim strSelect As String
  Dim cmdSelect As SqlCommand
  Dim dtrProducts As SqlDataReader

  conNorthwind = New SqlConnection( "Server=localhost;UID=sa;PWD=secret;Database=Northwind" )
  strSelect = "Select ProductName From Products Where CategoryID=@catID"
  cmdSelect = New SqlCommand( strSelect, conNorthwind )
  cmdSelect.Parameters.Add( "@catID", intCatID )
  conNorthwind.Open()
  dtrProducts = cmdSelect.ExecuteReader()

  rptProducts.DataSource = dtrProducts
  rptProducts.DataBind()

  dtrProducts.Close()
  conNorthwind.Close()
End Sub

Sub dlstCategories_ItemCommand( s As Object, e As DataListCommandEventArgs )
  Dim intCatID As Integer

  dlstCategories.SelectedIndex = e.Item.ItemIndex
  BindDataList
  intCatID = dlstCategories.DataKeys( e.Item.ItemIndex )
  BindRepeater( intCatID )
End Sub

</Script>

<html>
<head><title>DataListMasterDetail.aspx</title></head>
<body>
<form Runat="Server">

<table width="100%">
<tr><td valign="top">

<asp:DataList
  ID="dlstCategories"
  OnItemCommand="dlstCategories_ItemCommand"
  DataKeyField="CategoryID"
  ItemStyle-BorderStyle="Solid"
  ItemStyle-BorderColor="Blue"
  Width="200"
  CellPadding="5"
  CellSpacing="10"
  BackColor="lightgrey"
  Runat="Server">

<ItemTemplate>
  <asp:LinkButton
    Text='<%# Container.DataItem( "CategoryName" )%>'
    Runat="Server" />
</ItemTemplate>

<SelectedItemTemplate>
  <b><i><%# Container.DataItem( "CategoryName" )%></i></b>
</SelectedItemTemplate>

</asp:DataList>

</td><td valign="top" width="100%">

<asp:Repeater
  ID="rptProducts"
  Runat="Server">

<ItemTemplate>
  <%# Container.DataItem( "ProductName" ) %>
</ItemTemplate>

<SeparatorTemplate>

</SeparatorTemplate>

</asp:Repeater>

</td></tr>
</table>

</form>
</body>
</html>

--------------------------------------------
Mehdi.:)

cfouquet · September 23rd, 2004, 10:57 PM

Frames!!! They are evil!
Passing data between frames is a major pain. Frames use different processes on the browser which results
in different session IDs. This means that you can use the Session state bag...
Try it and see for yourself and then drop the frame idea..

Imar · September 24th, 2004, 12:42 AM

Hi there,

I agree with you that frames are a pain to work with and usually can be avoided.

However, I don't agree with the Session ID being different for each frame. Try this and see for yourself:

Code:

frameset.asp
<frameset rows="80,*,80" frameborder="NO" border="0" framespacing="0">
  <frame src="1.asp" name="topFrame" scrolling="NO" noresize>
  <frame src="2.asp" name="mainFrame">
</frameset>

1.asp and 2.asp
<body>
<%
    Response.Write("Session ID " & Session.SessionID)
%>
</body>

When you run this, you'll see that both frames have the same Session ID.

Cheers,

Imar
---------------------------------------
Imar Spaanjaars
Everyone is unique, except for me.

Hal Levy · September 24th, 2004, 08:43 AM

My issue with cross-frame scripting is MSFT keeps changing the rules... It's so much easier not to use frames and find a more elegant solution

Hal Levy
Web Developer, PDI Inc.

NOT a Wiley/Wrox Employee