Dynamically generated tables and event interception Part2

In the article forms and dynamically generated event intercepted before, there is demonstration of how to "dynamically generate a table of columns 2 and 3 event interceptor"; This paper will extend this example, when a button dynamically added to the table by clicking the sum of new the data columns.

Button is first placed on a page, its attributes set UseSubmitBehavior = "False", the procedure is as follows aspx

In this example, use of a coefficient data row HiddenField to record the Table, the PostBack by Request.Form ( "__ EVENTTARGET") determines whether produced by btnAddRow button.

*.aspx.vb

Partial Class _Default
    Inherits System.Web.UI.Page

    Private FRowCount As Integer
    Private FRowCountField As New HiddenField() FRowCountField As New HiddenField()

    '''

'' 'Dynamically generated Table.
'' '

    Private Sub CreateTable() Sub CreateTable(ByVal RowCount As Integer)
        Dim oTable As New Table()
        Dim oRow As TableRow
        Dim oCell As TableCell
        Dim oButton As Button
        Dim oTextBox As TextBox
        Dim N1 As Integer

        Me.Form.Controls.Add(oTable)
        '建立3列1栏的，其中第1栏置放 Button，第2栏置放 TextBox
        For N1 = 1 To RowCount
            oRow = New TableRow()
            oTable.Rows.Add(oRow)

            oCell = New TableCell()
            oRow.Cells.Add(oCell)
            oButton = New Button
            oButton.Text = "Button" & N1.ToString()
            '将 Button 的 Click 事件导向 Button_Click 函数
            AddHandler oButton.Click, AddressOf Button_Click
            oCell.Controls.Add(oButton)

            oCell = New TableCell()
            oRow.Cells.Add(oCell)
            oTextBox = New TextBox()
            oTextBox.Text = "TextBox" & N1.ToString()
            oCell.Controls.Add(oTextBox)
        Next
    End Sub

    Protected Sub Page_Init() Sub Page_Init(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Init
        FRowCountField.ID = "__RowCount"
        Me.Form.Controls.Add(FRowCountField)

        '取得上次记录的数据列数
        If Me.Request.Form(FRowCountField.UniqueID) Is Nothing Then
            FRowCount = 0
        Else
            FRowCount = CInt(Me.Request.Form(FRowCountField.UniqueID))
        End If

        '由 Request.Form("__EVENTTARGET") 判断是否由 btnAddRow 按钮产生的 PostBack
        If Me.Request.Form("__EVENTTARGET") = btnAddRow.UniqueID Then
            FRowCount = FRowCount + 1
        End If

        CreateTable(FRowCount) '动态产生 Table。
    End Sub

    Protected Sub Page_Load() Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
        FRowCountField.Value = FRowCount.ToString()
    End Sub

    'Table 中所有的 Button 的 Click 事件导向函数
    Protected Sub Button_Click() Sub Button_Click(ByVal sender As Object, ByVal e As System.EventArgs)
        Dim oButton As Button
        Dim oRow As TableRow
        Dim oCell As TableCell

        Dim oTextBox As TextBox = Nothing

        oButton = CType(sender, Button)
        oCell = CType(oButton.Parent, TableCell)
        oRow = CType(oCell.Parent, TableRow)

        '取得内含 TextBox 的 Cell，即第2栏
        oTextBox = CType(oRow.Cells(1).Controls(0), TextBox)
        oTextBox.Text = oButton.Text
    End Sub

End Class

ASP.NET Magic School

Original: Large columns dynamically generated tables and event interception Part2

Dynamically generated tables and event interception Part2

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