How to get text from a label in a DataList ItemTemplate ?

Hi,
I use Visual Web Developer 2008 Express.
I have Label1 in a DataList ItemTemplate. I wish to use a button to get the text from that label and add it to text in TextBox1 which is elsewhere on the page.

I know how to do this from a standard label on a ASP.NET web page but cannot work out how to get the text from a label inside a DataList ItemTemplate.

This is what I thought I should do:-

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    Protected Sub submit_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles submit.Click

TextBox1.Text = TextBox1.Text & " " & DataList1.ItemTemplates.ItemTemplate.Label2.Text

End Sub

I thought that because “ DataList1.ItemTemplates.ItemTemplate.Label2 - System.Web.UI.WebControls.Label “ - is what is written in the properties window header when I select the label in the DataList template.

When I try that, I get a Blue Squiggle under "DataList1.ItemTemplates" and if I hover over the squiggle the error box comes up saying " 'ItemTemplates' is not a member of 'System.Web.UI.WeControls.DataList'

Thanks for any help on offer

Apr 13 '10 #1

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7275

CroCrew

564

Expert 512MB

Hello CharlieChilds,

I personally find easier to use a datagrid. Here is a working example that you can try out. I believe that it meets your requirements. Let me know if you have any questions.

Default.aspx

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<%@ Page Language="VB" EnableEventValidation="false" AutoEventWireup="false" CodeFile="Default.aspx.vb" Inherits="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></title>

    </head>

    <body>

        <form id="form1" runat="server">

            <div>

                Selected Name: <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>  Age: <asp:TextBox ID="TextBox2" runat="server"></asp:TextBox>
 
                <asp:DataGrid ID="DataGrid1" runat="server" AutoGenerateColumns="False" GridLines="Both">

                    <Columns>

                        <asp:BoundColumn DataField="KeyId" Visible="false"></asp:BoundColumn>

                        <asp:BoundColumn DataField="FullName" Visible="true"></asp:BoundColumn>

                        <asp:BoundColumn DataField="Age" Visible="true"></asp:BoundColumn>

                        <asp:ButtonColumn CommandName="Copy" DataTextField="SelectButton"></asp:ButtonColumn>

                    </Columns>

                </asp:DataGrid>                

            </div>

        </form>

    </body>

</html>

Default.aspx.vb

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Imports System.Data
 
Partial Class Default

    Inherits System.Web.UI.Page
 
    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load

        FillDataList()

    End Sub
 
    Sub FillDataList()

        Dim mydatatable As New DataTable

        mydatatable.Columns.Add("KeyId", Type.GetType("System.String"))

        mydatatable.Columns.Add("FullName", Type.GetType("System.String"))

        mydatatable.Columns.Add("Age", Type.GetType("System.String"))

        mydatatable.Columns.Add("SelectButton", Type.GetType("System.String"))
 
        Dim myrow As DataRow
 
        myrow = mydatatable.NewRow

        myrow("KeyId") = 1

        myrow("FullName") = "Izabella Miko"

        myrow("Age") = 29

        myrow("SelectButton") = "<input id='Button1' type='button' value='Select' onclick=""__doPostBack('DataGrid1$ctl02$ctl00')"" />"

        mydatatable.Rows.Add(myrow)
 
        myrow = mydatatable.NewRow

        myrow("KeyId") = 2

        myrow("FullName") = "Tiffani-Amber Thiessen"

        myrow("Age") = 36

        myrow("SelectButton") = "<input id='Button1' type='button' value='Select' onclick=""__doPostBack('DataGrid1$ctl03$ctl00')"" />"

        mydatatable.Rows.Add(myrow)
 
        myrow = mydatatable.NewRow

        myrow("KeyId") = 3

        myrow("FullName") = "Mischa Barton"

        myrow("Age") = 24

        myrow("SelectButton") = "<input id='Button1' type='button' value='Select' onclick=""__doPostBack('DataGrid1$ctl04$ctl00')"" />"

        mydatatable.Rows.Add(myrow)
 
        DataGrid1.DataSource = mydatatable

        DataGrid1.DataBind()

    End Sub
 
    Protected Sub DataGrid1_ItemCommand(ByVal source As Object, ByVal e As System.Web.UI.WebControls.DataGridCommandEventArgs) Handles DataGrid1.ItemCommand

        Select Case (e.CommandName)

            Case "Copy"

                TextBox1.Text = e.Item.Cells(1).Text.ToString

                TextBox2.Text = e.Item.Cells(2).Text.ToString

            Case Else

                ' You can add more cases for other functions.

        End Select

    End Sub

End Class

This is what I call a “hard” example. If I were to write it into my application many things would be done dynamically like the data binding and the onclick event would be in a loop.

Happy Coding,
CroCrew~

Apr 15 '10 #2

CharlieChilds

Hi CroCrew,

Thanks very much for your response.

I don't see dataGrid in my tool box of VWD 2008 Express. I used datalist because I need to repeat images accross the page. I tried GridView first using different fields for image urls but then realised I had a problem with databinding to other field info per individual image.
I am still not 100% sure that DataList can do all that I need but so far so good.

Have sorted this posts issue out by using ItemCommand - as follows:

Give the button a CommandName of "Item".

Click on ItemCommand property of DataList to create a protected void. Fill the protected void as follows.

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    protected void DataList1_ItemCommand(object source, DataListCommandEventArgs e)

    {  if (e.CommandName == "Item")

        {

            Label label1 = (Label)DataList1.Items[e.Item.ItemIndex].FindControl("Label1");

            Label label2 = (Label)DataList1.Items[e.Item.ItemIndex].FindControl("Label2");

            TextBox2.Text = TextBox2.Text + label1.Text + " " + label2.Text + Environment.NewLine;

        }

    }

It works a treat.
Thanks again for your effort and advice. I'll be looking up DataGrid

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How to get text from a label in a DataList ItemTemplate ?

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