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Get values of controls in ListView Items

Posted on 2008-06-23
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Last Modified: 2013-11-26
I have an ASP.NET 3.5 application with a web control that has a ListView which displays a list of questions.  Each question has: the question (label), "pass" radio button, "fail" radio button and a notes multi-line textbox.  The end user will select either pass or fail for each question (list item) and then click a submit button (not in the ListView).  On click I need to iterate through each of the items in the ListView and figure out if pass or fail was checked and record that question id and the response (pass or fail).  I have the recording process done with LINQ and it works well but need to get the iteration down.

Thank you for your help!
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Question by:csg_int_it
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3 Comments
 
LVL 37

Expert Comment

by:samtran0331
ID: 21848507
It's pretty much the same as any data listing control...
aspx:
==========================================================
<%@ Page Language="vb" AutoEventWireup="false" CodeBehind="Default.aspx.vb" Inherits="VB_2008._Default" %>
 
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
 
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
    <title>Untitled Page</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:SqlDataSource ID="SqlDataSource1" runat="server" 
            ConnectionString="<%$ ConnectionStrings:NorthwindConnectionString %>" 
            SelectCommand="SELECT TOP 4 [EmployeeID], [LastName], [FirstName] FROM [Employees]"></asp:SqlDataSource>
    </div>
    <asp:ListView ID="ListView1" runat="server" DataKeyNames="EmployeeID" 
        DataSourceID="SqlDataSource1">
        <LayoutTemplate>
            <table id="Table1" runat="server">
                <tr id="Tr1" runat="server">
                    <td id="Td1" runat="server">
                        <table ID="itemPlaceholderContainer" runat="server" border="1" 
                            style="background-color: #FFFFFF;border-collapse: collapse;border-color: #999999;border-style:none;border-width:1px;font-family: Verdana, Arial, Helvetica, sans-serif;">
                            <tr id="Tr2" runat="server" style="background-color: #FFFBD6;color: #333333;">
                                <th id="Th1" runat="server">
                                    EmployeeID</th>
                                <th id="Th2" runat="server">
                                    LastName</th>
                                <th id="Th3" runat="server">
                                    FirstName</th>
                                    <th id="Th4" runat="server">Stuff</th>
                            </tr>
                            <tr ID="itemPlaceholder" runat="server">
                            </tr>
                        </table>
                    </td>
                </tr>
                <tr id="Tr3" runat="server">
                    <td id="Td2" runat="server" 
                        style="text-align: center;background-color: #FFCC66;font-family: Verdana, Arial, Helvetica, sans-serif;color: #333333;">
                    </td>
                </tr>
            </table>
        </LayoutTemplate>
        <ItemTemplate>
            <tr style="background-color: #FFFBD6;color: #333333;">
                <td>
                    <asp:Label ID="EmployeeIDLabel" runat="server" 
                        Text='<%# Eval("EmployeeID") %>' />
                </td>
                <td>
                    <asp:Label ID="LastNameLabel" runat="server" Text='<%# Eval("LastName") %>' />
                </td>
                <td>
                    <asp:Label ID="FirstNameLabel" runat="server" Text='<%# Eval("FirstName") %>' />
                </td>
                <td>
                    <asp:RadioButtonList ID="RadioButtonList1" runat="server">
                    <asp:ListItem Text="Pass" Value="p"></asp:ListItem>
                    <asp:ListItem Text="Fail" Value="f"></asp:ListItem>
                    </asp:RadioButtonList>
                    <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
                </td>
            </tr>
        </ItemTemplate>
    </asp:ListView>
    <asp:Button ID="Button1" runat="server" Text="Button" />
    
    </form>
</body>
</html>
 
 
 
 
codebehind:
=================================================================
    Protected Sub Button1_Click(ByVal sender As Object, ByVal e As EventArgs) Handles Button1.Click
        Dim str As String = String.Empty
        For i As Integer = 0 To Me.ListView1.Items.Count - 1
            If Me.ListView1.Items(i).ItemType = ListViewItemType.DataItem Then
                str &= "Row: " & i.ToString & " "
                Dim rbl As RadioButtonList
                rbl = CType(ListView1.Items(i).FindControl("RadioButtonList1"), RadioButtonList)
                If rbl.SelectedValue = "p" Then
                    str &= ", Pass"
                Else
                    str &= ", Fail"
                End If
                str &= ", Text: " & CType(ListView1.Items(i).FindControl("TextBox1"), TextBox).Text & "<br />"
            End If
        Next
        Response.Write(str)
    End Sub

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LVL 37

Accepted Solution

by:
samtran0331 earned 500 total points
ID: 21848527
the gist of the above sample being:
1. Loop through the listview items
2. findcontrol to find your controls and set them to instantiated controls
3. get the value of the instantiated controls:



       For i As Integer = 0 To Me.ListView1.Items.Count - 1
            If Me.ListView1.Items(i).ItemType = ListViewItemType.DataItem Then
                str &= "Row: " & i.ToString & " "
                Dim rbl As RadioButtonList
                rbl = CType(ListView1.Items(i).FindControl("RadioButtonList1"), RadioButtonList)
                If rbl.SelectedValue = "p" Then
                    str &= ", Pass"
                Else
                    str &= ", Fail"
                End If
                str &= ", Text: " & CType(ListView1.Items(i).FindControl("TextBox1"), TextBox).Text & "<br />"
            End If
        Next
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Author Closing Comment

by:csg_int_it
ID: 31469818
Thank you for the very fast response, it helped me to continue on with my development.
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