Using the Textbox.Text on Dynmaicly Created Textboxes in VB.Net

I found a script that i modified to create textbox fields Dynamicly.  I am now faced with the delimia of figuring out a way to pull the data in those dynamicly created fields.  Since they are not defined, I have not found a way to use a variable to pull the data.

Here is the code .aspx


<%@ Page Language="VB" AutoEventWireup="false" CodeFile="DynamicTextboxes.aspx.vb" Inherits="DynamicTextboxes" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "">

<html xmlns="" >
<head runat="server">
    <title>Untitled Page</title>
    <form id="form1" runat="server"> 
       <h5 style="text-align: left">
       <asp:Label ID="Label2" runat="server"></asp:Label>
     <div style="text-align: left">  
       <asp:Table runat="server" id="Quotes">
       <asp:TableHeaderCell runat="server" ID="TableCell13" Visible="false"></asp:TableHeaderCell>
       <asp:TableHeaderCell> </asp:TableHeaderCell>
       <asp:TableRow runat="server" ID="TableRow1">
       <asp:TableCell runat="server" ID="TableCell6" Visible="false"></asp:TableCell>
       <asp:TableCell runat="server" ID="TableCell1" Wrap="false">Item 1</asp:TableCell>
       <asp:TableCell runat="server" ID="TableCell2"><asp:TextBox ID="Name1" runat="server" Width="100"></asp:TextBox></asp:TableCell>
       <asp:TableCell runat="server" ID="TableCell3"><asp:TextBox ID="Model1" runat="server" Width="75"></asp:TextBox></asp:TableCell>
       <asp:TableCell runat="server" ID="TableCell4"><asp:TextBox ID="Qty1" runat="server" Width="30"></asp:TextBox></asp:TableCell>
       <asp:TableRow runat="server" ID="TableRow2">
       <asp:TableCell runat="server" ID="TableCell5" Visible="false"></asp:TableCell>
       <asp:TableCell runat="server" ID="TableCell7" Wrap="false">Item 2</asp:TableCell>
       <asp:TableCell runat="server" ID="TableCell8"><asp:TextBox ID="Name2" runat="server" Width="100"></asp:TextBox></asp:TableCell>
       <asp:TableCell runat="server" ID="TableCell9"><asp:TextBox ID="Model2" runat="server" Width="75"></asp:TextBox></asp:TableCell>
       <asp:TableCell runat="server" ID="TableCell10"><asp:TextBox ID="Qty2" runat="server" Width="30"></asp:TextBox></asp:TableCell>
           <asp:Button ID="Button1" runat="server" Text="Add Row" />
           <asp:Button ID="Submit1" runat="server" Text="Submit" OnClick="Submit"/>

Here is the code .aspx.vb


Partial Class DynamicTextboxes
    Inherits System.Web.UI.Page

    Private _additionalRowCount As Integer = 0

    Private _previousPrinterName As Integer = -1 ' required initial value
    Private _previousPrinterModel As Integer = -1 ' required initial value
    Private _previousQty As Integer = -1 ' required initial value

    Private targetTable As Table = Nothing 'assigned in PreInit

    Private ReadOnly Property NextNameTextboxID() As String

            Dim PrinterNameString As String = "PrinterName{0}"

            If Me._previousPrinterName = -1 Then
                Me._previousPrinterName = (targetTable.Rows.Count - 1)
            End If

            Dim nextPrinterNameTBId As String = String.Format(PrinterNameString, (Me._previousPrinterName + 1).ToString())
            Me._previousPrinterName += 1

            Return nextPrinterNameTBId

        End Get
    End Property
    Private ReadOnly Property NextModelTextboxID() As String
            Dim PrinterModelString As String = "PrinterModel{0}"

            If Me._previousPrinterModel = -1 Then
                Me._previousPrinterModel = (targetTable.Rows.Count - 1)
            End If

            Dim nextPrinterModelTBId As String = String.Format(PrinterModelString, (Me._previousPrinterModel + 1).ToString())
            Me._previousPrinterModel += 1

            Return nextPrinterModelTBId

        End Get
    End Property
    Private ReadOnly Property NextQtyTextboxID() As String
            Dim QtyString As String = "Qty{0}"

            If Me._previousQty = -1 Then
                Me._previousQty = (targetTable.Rows.Count - 1)
            End If

            Dim nextQtyTBId As String = String.Format(QtyString, (Me._previousQty + 1).ToString())
            Me._previousQty += 1

            Return nextQtyTBId
        End Get
    End Property
     Protected Sub Page_PreInit(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.PreInit

        ' initialise reference variable
        ' ****************************************************************************************
        Me.targetTable = Me.Quotes ' set to appropriate table instance (myTable etc)!
        ' ****************************************************************************************

        Integer.TryParse(Request.Form("additionalRows"), _additionalRowCount)

        If _additionalRowCount > 0 Then
            ' replace / restore dynamic rows
            Dim i As Integer = 0
            While i < _additionalRowCount
                Me.AddAdditonalRow(False) 'false because we are recreating and don't want the row count increased
                i += 1
            End While

        End If

    End Sub
    Protected Sub Page_PreRender(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.PreRender

        ' embed row count in output form as hidden field.
        ' Viewstate is not available in PreInit and this is the only reliable way to proceed
        ' you could provide a multi part value with a hash or an encrypted value. 
        ' This persistence model is arbitrary but it must be persisted in the Form 
        ' as a posted value with a known client side element ID (name)
        ClientScript.RegisterHiddenField("additionalRows", _additionalRowCount.ToString())

    End Sub
    Protected Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click

        Dim tr As TableRow = Me.AddAdditonalRow(True) ' increase row count

    End Sub
    Private Sub FormatItem(ByRef tr As TableRow)

        ' you would format the TableRow cells in this method, 
        ' possibly passing another object param to assign values from
        ' set some of the controls in the row
        tr.Cells(0).Text = Server.HtmlEncode(String.Format("Item {0}", (targetTable.Rows.Count.ToString() - 1)))

    End Sub
    Sub Submit(ByVal sender As Object, ByVal e As EventArgs)

        Dim TableView As String

        TableView = "<table><tr><td>&nbsp;</td><td style='height: 26px;'>" _
        + "Name:</td><td>Model:</td><td>Qty:</td></tr><tr>" _
        + "<td nowrap='nowrap' style='height: 26px;'>Item 1" _
        + "</td><td>" & Name1.Text _
        + "</td><td>" & Model1.Text _
        + "</td><td>" & Qty1.Text  + "</td></tr>"

        Dim X As Integer
        X = 2
        Do While X <= 5
            If Name2.Text = "" Then
                TableView = TableView & "</table>"
                TableView = TableView & "<tr><td nowrap='nowrap' style='height: 26px;'>Item 2" _
                + "</td><td>" & Name2.Text _
                + "</td><td>" & Model2.Text _
                + "</td><td>" & Qty2.Text + "</td></tr>"
            End If
            X += 1
        '' Loop doesn't work correctly because i am using the static Name2.Text, instead of the dynamic textbox "Name" & X & ".Text"
        TableView = TableView + "</table>" 'adding this line until Loop is working correctly

        Label2.Text = TableView.ToString

    End Sub
    Private Function AddAdditonalRow(ByVal incrementcounter As Boolean) As TableRow


        Dim tr As New TableRow
        Dim cell1, cell2, cell3, cell4, cell5, cell6 As New TableCell

        cell1.Wrap = False

        Dim name As New TextBox
        name.Width = 100
        Dim model As New TextBox
        model.Width = 75
        Dim qty As New TextBox
        qty.Width = 30

        name.ID = Me.NextNameTextboxID

        model.ID = Me.NextModelTextboxID

        qty.ID = Me.NextQtyTextboxID


        If incrementcounter Then
            _additionalRowCount += 1
        End If

        Return tr

    End Function
End Class

8/17/2007 2:07:01 PM 93655 articles. 5 followers. Follow

6 Replies

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i guess no.of of text boxes you have is equal to is targetTable.Rows.Count.

at server side you can find a control if you know id of control using Page.FindControl() function.


so you can use loop and change number and access textboxes like PrinterName1, PrinterName2, PrinterNam3.



Don't forget to click "Mark as Answer" on the post that helped you.
8/17/2007 2:49:02 PM

Try this :

Response.Write("TextBox Value: " & (CType(FindControl("controlnamecomeshere"), TextBox)).Text)


Suprotim Agarwal

ASP.NET Grid With Excel Capabilities | 27 GridView Tips & Tricks | Hosting your site? | SQL Server Tips
8/17/2007 3:15:30 PM

I have used the replies above to create this code - thanks for your help....

But I still have an issue, if the textbox doesn't exist.... can anyone tell me how to change the

If nameString = "" Then

to something like

If nameString exists??  It maybe a stilly question, but I have searched and haven't found a solution.  Any assistance is greatly appreciated!


Dim X As Integer
        X = 2

        Do While X <= 5

            Dim nameString As String = CType(FindControl("Name" & X), TextBox).Text
            Dim modelString As String = CType(FindControl("Model" & X), TextBox).Text
            Dim qtyString As String = CType(FindControl("qty" & X), TextBox).Text
            Dim item As String = "Item" & X

            If nameString = "" Then
                TableView = TableView
                TableView = TableView & "<tr><td nowrap='nowrap' style='height: 26px;'>" & item _
                + "</td><td>" & nameString _
                + "</td><td>" & modelString _
                + "</td><td>" & qtyString + "</td></tr>"
            End If
            X += 1


8/18/2007 5:59:31 PM
I figured it out!!!!! 

Do While (targetTable.Rows.Count - 1) >= X

I had to use the -1 cuz I have header rows, but it works great!!!!!!!



8/18/2007 6:12:42 PM
I figured it out!!!!! 

Do While (targetTable.Rows.Count - 1) >= X

I had to use the -1 cuz I have header rows, but it works great!!!!!!!


8/18/2007 6:12:49 PM

Sorry about the duplicate post.

 I have seen others do the same thing, the regular reply doesn't seem to be a problem.  At least on my computer... It was the quick reply that caused the duplicates.  It didn't appear to post, so I hit it again.  Then just closed out, because it didn't appear to be working.


8/18/2007 6:15:26 PM

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