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adding items to a datalist?

Posted on 2004-09-30
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Last Modified: 2012-05-05
How can I add items programmatically to the datalist fields. For instance there is the ItemTemplate Field and AlternatingItemTemplate fields I guess.  How can I populate these fields?
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Question by:dotnet22
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Expert Comment

by:AerosSaga
ID: 12190960
[Visual Basic]
<%@ Page Language="VB" AutoEventWireup="True" %>
<%@ Import Namespace="System.Data" %>
 
<html>
   <script runat="server">
 
      Function CreateDataSource() As ICollection

         Dim dt As New DataTable()
         Dim dr As DataRow
       
         dt.Columns.Add(New DataColumn("StringValue", GetType(String)))
       
         Dim i As Integer

         For i = 0 To 9
            dr = dt.NewRow()
            dr(0) = "Item " & i.ToString()
            dt.Rows.Add(dr)
         Next i
         
         Dim dv As New DataView(dt)
         Return dv

      End Function 'CreateDataSource

      Sub Page_Load(sender As Object, e As EventArgs)

         If Not IsPostBack Then
            DataList1.DataSource = CreateDataSource()
            DataList1.DataBind()
         End If

      End Sub 'Page_Load


      Sub Button1_Click(sender As Object, e As EventArgs)
       
         If DropDown1.SelectedIndex = 0 Then
            DataList1.RepeatDirection = RepeatDirection.Horizontal
         Else
            DataList1.RepeatDirection = RepeatDirection.Vertical
         End If

         If DropDown2.SelectedIndex = 0 Then
            DataList1.RepeatLayout = RepeatLayout.Table
         Else
            DataList1.RepeatLayout = RepeatLayout.Flow
         End If

         DataList1.RepeatColumns = DropDown3.SelectedIndex + 1
       
         If Check1.Checked = True And DataList1.RepeatLayout = RepeatLayout.Table Then
            DataList1.BorderWidth = Unit.Pixel(1)
            DataList1.GridLines = GridLines.Both
         Else
            DataList1.BorderWidth = Unit.Pixel(0)
            DataList1.GridLines = GridLines.None
         End If

      End Sub 'Button1_Click
 
   </script>
 
<body>
 
   <form runat="server">

      <h3>DataList Example</h3>
 
      <asp:DataList id="DataList1" runat="server"
           BorderColor="black"
           CellPadding="3"
           Font-Name="Verdana"
           Font-Size="8pt">

         <HeaderStyle BackColor="#aaaadd">
         </HeaderStyle>

         <AlternatingItemStyle BackColor="Gainsboro">
         </AlternatingItemStyle>

         <HeaderTemplate>
            Items
         </HeaderTemplate>
               
         <ItemTemplate>
            <%# DataBinder.Eval(Container.DataItem, "StringValue") %>
         </ItemTemplate>
 
      </asp:DataList>
      <p>
      <hr noshade align="left" width="300px">
      RepeatDirection:
      <asp:DropDownList id=DropDown1 runat="server">
         <asp:ListItem>Horizontal</asp:ListItem>
         <asp:ListItem>Vertical</asp:ListItem>
      </asp:DropDownList><br>
      RepeatLayout:
      <asp:DropDownList id=DropDown2 runat="server">
         <asp:ListItem>Table</asp:ListItem>
         <asp:ListItem>Flow</asp:ListItem>
      </asp:DropDownList><br>
      RepeatColumns:
      <asp:DropDownList id=DropDown3 runat="server">
         <asp:ListItem>1</asp:ListItem>
         <asp:ListItem>2</asp:ListItem>
         <asp:ListItem>3</asp:ListItem>
         <asp:ListItem>4</asp:ListItem>
         <asp:ListItem>5</asp:ListItem>
      </asp:DropDownList><br>
      Show Borders:
      <asp:CheckBox id=Check1 runat="server" /><p>
      <asp:LinkButton id=Button1
           Text="Refresh DataList"
           OnClick="Button1_Click"
           runat="server"/>
   </form>
 
</body>
</html>
[C#]
<%@ Page Language="C#" AutoEventWireup="True" %>
<%@ Import Namespace="System.Data" %>
<html>
   <script runat="server">

      ICollection CreateDataSource()
      {
         DataTable dt = new DataTable();
         DataRow dr;

         dt.Columns.Add(new DataColumn("StringValue", typeof(string)));
         for (int i = 0; i < 10; i++)
         {
            dr = dt.NewRow();
            dr[0] = "Item " + i.ToString();
            dt.Rows.Add(dr);
         }

         DataView dv = new DataView(dt);
         return dv;
      }

      void Page_Load(Object Sender, EventArgs e)
      {
         if (!IsPostBack)
         {
            DataList1.DataSource = CreateDataSource();
            DataList1.DataBind();
         }
      }

      void Button1_Click(Object Sender, EventArgs e)
      {

         if (DropDown1.SelectedIndex == 0)
            DataList1.RepeatDirection = RepeatDirection.Horizontal;
         else
            DataList1.RepeatDirection = RepeatDirection.Vertical;
         if (DropDown2.SelectedIndex == 0)
            DataList1.RepeatLayout = RepeatLayout.Table;
         else
            DataList1.RepeatLayout = RepeatLayout.Flow;
         DataList1.RepeatColumns=DropDown3.SelectedIndex+1;
         if ((Check1.Checked ==true) && 
            (DataList1.RepeatLayout == RepeatLayout.Table))
         {
            DataList1.BorderWidth = Unit.Pixel(1);
            DataList1.GridLines = GridLines.Both;
         }    
         else  
         {
            DataList1.BorderWidth = Unit.Pixel(0);
            DataList1.GridLines = GridLines.None;
         }    
      }    

   </script>

<body>

   <form runat="server">
      <h3>DataList Sample</h3>

         <asp:DataList id="DataList1"
              BorderColor="black"
              CellPadding="3"
              Font-Name="Verdana"
              Font-Size="8pt"
              runat="server">

            <HeaderStyle BackColor="#aaaadd"/>
            <AlternatingItemStyle BackColor="Gainsboro"/>

            <HeaderTemplate>
               Items
            </HeaderTemplate>
            <ItemTemplate>
               <%# DataBinder.Eval(Container.DataItem, "StringValue") %>
            </ItemTemplate>

         </asp:DataList>
         <p>
         <hr noshade align="left" width="300px">
         RepeatDirection:
         <asp:DropDownList id=DropDown1 runat="server">
            <asp:ListItem>Horizontal</asp:ListItem>
            <asp:ListItem>Vertical</asp:ListItem>
         </asp:DropDownList><br>
         RepeatLayout:
         <asp:DropDownList id=DropDown2 runat="server">
            <asp:ListItem>Table</asp:ListItem>
            <asp:ListItem>Flow</asp:ListItem>
         </asp:DropDownList><br>
         RepeatColumns:
         <asp:DropDownList id=DropDown3 runat="server">
            <asp:ListItem>1</asp:ListItem>
            <asp:ListItem>2</asp:ListItem>
            <asp:ListItem>3</asp:ListItem>
            <asp:ListItem>4</asp:ListItem>
            <asp:ListItem>5</asp:ListItem>
         </asp:DropDownList><br>
         Show Borders:
         <asp:CheckBox id=Check1 runat="server" />
         <p>
         <asp:LinkButton id=Button1
              Text="Refresh DataList"
              OnClick="Button1_Click"
              runat="server"/>
      </font>
   </form>

</body>
</html>
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpgenref/html/cpcondatalistwebservercontrol.asp

Regards,

Aeros
0
 

Author Comment

by:dotnet22
ID: 12191023
My items are coming from a database:

string connString = ConfigurationSettings.AppSettings["NorthWind"];
                  ds = new DataSet();
                  SqlConnection conn = new SqlConnection(connString);
                  string select = "SELECT * FROM Products";
                  sqlAdapter = new SqlDataAdapter(select,conn);
                  sqlAdapter.Fill(ds);
                  DataList1.DataSource = ds.Tables[0].DefaultView;
                  
                  DataList1.DataBind();

this doesn't do anything? I'm trying to populate the individual field like ItemTemplate and AlternatingTemplate?
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LVL 17

Expert Comment

by:AerosSaga
ID: 12191067
Ok then check here:
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpref/html/frlrfsystemwebuiwebcontrolsbasedatalistclassdatasourcetopic.asp
Function CreateDataSource() As ICollection
        Dim dt As New DataTable()
        Dim dr As DataRow
       
        dt.Columns.Add(New DataColumn("IntegerValue", GetType(Int32)))
        dt.Columns.Add(New DataColumn("StringValue", GetType(String)))
        dt.Columns.Add(New DataColumn("CurrencyValue", GetType(Double)))
       
        Dim i As Integer
        For i = 0 To 8
            dr = dt.NewRow()
           
            dr(0) = i
            dr(1) = "Item " + i.ToString()
            dr(2) = 1.23 *(i + 1)
           
            dt.Rows.Add(dr)
        Next i
       
        Dim dv As New DataView(dt)
        Return dv
  End Function 'CreateDataSource

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LVL 17

Expert Comment

by:AerosSaga
ID: 12191117
The ide handles the alternating & item style
0
 
LVL 17

Expert Comment

by:AerosSaga
ID: 12191120
You just set it for the particular datalist
0
 

Author Comment

by:dotnet22
ID: 12191129
I'm still confused on why my source code isnt' working? All the data is in the dataset... Why do I need to create a DataTable and datarows?
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LVL 17

Expert Comment

by:AerosSaga
ID: 12191204
are you sure your dataset is not empty?
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Author Comment

by:dotnet22
ID: 12191297
yes. I'm checking it and it is definetly not empty...
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LVL 17

Accepted Solution

by:
AerosSaga earned 500 total points
ID: 12191998
maybe because I'm creating a dataview and creating that to bind with as you are just using the default view of a dataset:
 Dim dv As New DataView(dt)

vs

DataList1.DataSource = ds.Tables[0].DefaultView;

  Function CreateDataSource() As ICollection

         Dim dt As New DataTable()
         Dim dr As DataRow
       
         dt.Columns.Add(New DataColumn("StringValue", GetType(String)))
       
         Dim i As Integer

         For i = 0 To 9
            dr = dt.NewRow()
            dr(0) = "Item " & i.ToString()
            dt.Rows.Add(dr)
         Next i
         
         Dim dv As New DataView(dt)
         Return dv

      End Function 'CreateDataSource

 DataList1.DataSource = CreateDataSource()
0
 
LVL 17

Expert Comment

by:AerosSaga
ID: 12192006
[Visual Basic]
Private Sub MakeDataView(ds As DataSet)
   Dim dv As New DataView(ds.Tables("Suppliers"), _
                          "Country = 'UK'", _
                          "CompanyName", _
                          DataViewRowState.CurrentRows)
   dv.AllowEdit = True
   dv.AllowNew = True
   dv.AllowDelete = True
End Sub 'MakeDataView
End Class 'Sample

[C#]
private void MakeDataView(DataSet ds)
{
   DataView dv = new DataView(ds.Tables["Suppliers"], "Country = 'UK'", "CompanyName", DataViewRowState.CurrentRows);
   dv.AllowEdit = true;
   dv.AllowNew = true;
   dv.AllowDelete = true;
}

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpref/html/frlrfsystemdatadataviewclassctortopic.asp
0
 
LVL 28

Expert Comment

by:mmarinov
ID: 12192761
Hi dotnet22,

have you tried like this:

               ds = new DataSet();
               SqlConnection conn = new SqlConnection(connString);
               string select = "SELECT * FROM Products";
               sqlAdapter = new SqlDataAdapter(select,conn);
               sqlAdapter.Fill(ds);
               DataList1.DataSource = ds.Tables[0];
               
               DataList1.DataBind();

B..M
0
 

Author Comment

by:dotnet22
ID: 12193326
Yes. I've tried that. I think the problem might be the fact that I'm using the visual studio designer without touching the html? do we need to do anything with the html?
0
 
LVL 28

Expert Comment

by:mmarinov
ID: 12198215
may be it is easier  if you post the entire code

B..M
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