代码之家 › 专栏 › 技术社区 › LiamGu

当从服务器端代码创建HTML元素时,如何在另一个子元素中使用它们的ID?

vb.net asp.net

LiamGu · 技术社区 · 16 年前

我在代码隐藏中创建了一个表,最后一列包含一个带有runat=“server”的HTML复选框。

我使用的代码是:

        Do While reader.HasRows
            Do While reader.Read
                Dim tNewRow As New HtmlTableRow
                Dim cellSKU, cellDESCR, cellDept1, cellDeptGrp1, cellDeptRng1, cellStand, cellBoard, cellSelect As New HtmlTableCell
                cellSKU.InnerHtml = "<a href='edit.aspx?edit=" & reader("SKUN") & "'>" & reader("SKUN") & "</a>"
                cellDESCR.InnerText = reader("DESCR")
                cellDept1.InnerText = reader("DPT1")
                cellDeptGrp1.InnerText = reader("GRP1")
                cellDeptRng1.InnerText = reader("RNG1")
                cellBoard.InnerText = reader("BOARD")
                cellStand.InnerText = reader("STAND")
                cellSelect.InnerHtml = "<input type='checkbox' id='selectedSKU' value='" & reader("SKUN") & "' runat='server' />"
                tNewRow.Cells.Add(cellSKU)
                tNewRow.Cells.Add(cellDESCR)
                tNewRow.Cells.Add(cellDept1)
                tNewRow.Cells.Add(cellDeptGrp1)
                tNewRow.Cells.Add(cellDeptRng1)
                tNewRow.Cells.Add(cellStand)
                tNewRow.Cells.Add(cellBoard)
                tNewRow.Cells.Add(cellSelect)
                tNewRow.Style.Add("border", "solid 1px #cccccc")
                skusTable.Rows.Add(tNewRow)
            Loop
            reader.NextResult()
        Loop

但我想在另一个子项中使用该复选框,例如:

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

尽管我不能使用selectedsku.whatever作为复选框,但在运行代码的另一部分之前,该复选框不在页面上。

有什么方法可以让我绕过这一点,还是其他的方法?

事先谢谢你的帮助。

2 回复 | 直到 16 年前

digiguru 16 年前

这很讨厌,但这里……

            Dim skusTable As New HtmlTable
            Dim i As Integer

            Do While reader.HasRows
                Do While reader.Read
                    i = i + 1

                    Dim tNewRow As New HtmlTableRow
                    tNewRow.ID = "MyRow" & i
                    Dim cellSKU, cellDESCR, cellDept1, cellDeptGrp1, cellDeptRng1, cellStand, cellBoard, cellSelect As New HtmlTableCell
                    cellSKU.InnerHtml = "<a href='edit.aspx?edit=" & reader("SKUN") & "'>" & reader("SKUN") & "</a>"
                    cellDESCR.InnerText = reader("DESCR")
                    cellDept1.InnerText = reader("DPT1")
                    cellDeptGrp1.InnerText = reader("GRP1")
                    cellDeptRng1.InnerText = reader("RNG1")
                    cellBoard.InnerText = reader("BOARD")
                    cellStand.InnerText = reader("STAND")
'Create the checkbox as a webcontrol and add it to the table cell
                     Dim checkBox As New HtmlControls.HtmlInputCheckBox
                    checkBox.Value = reader("SKUN")
                    checkBox.ID = "selectedSKU"
                    cellSelect.ID = "SelectedCell"
                    cellSelect.Controls.Add(New WebControls.CheckBox)


                    tNewRow.Cells.Add(cellSKU)
                    tNewRow.Cells.Add(cellDESCR)
                    tNewRow.Cells.Add(cellDept1)
                    tNewRow.Cells.Add(cellDeptGrp1)
                    tNewRow.Cells.Add(cellDeptRng1)
                    tNewRow.Cells.Add(cellStand)
                    tNewRow.Cells.Add(cellBoard)
                    tNewRow.Cells.Add(cellSelect)
                    tNewRow.Style.Add("border", "solid 1px #cccccc")
                    skusTable.Rows.Add(tNewRow)
                Loop
                reader.NextResult()
            Loop

现在您所需要做的就是使用findcontrols来获取元素…

            Dim myRow As HtmlControls.HtmlTableRow = skusTable.FindControl("MyRow" & i)
            'Probably be good to check the object exists first....
            If Not myRow Is Nothing Then
                Dim myCell As HtmlControls.HtmlTableCell = myRow.FindControl("SelectedCell")
                If Not myCell Is Nothing Then
                    Dim myCheckbox As HtmlControls.HtmlInputCheckBox = myCell.FindControl("selectedSKU")
                    If Not myCheckbox Is Nothing Then
                        'Got it! now is it selected?
                        Return myCheckbox.Checked
                    End If
                End If
            End If

AnthonyWJones 16 年前

runat=“server”属性由ASP.NET进程解析,并指示它应该创建某种控制对象。此时您的代码正在运行,此分析已经完成。ASP.NET不分析添加到InnerHTML属性中的内容,以查找其他runat属性或任何其他特定于ASP.NET的标记,InnerHTML应该是要发送到服务器的严格标准HTML。

可以创建复选框ASP.NET控件的实例并将其添加到 cellSelect 控制集合,相当于runat=“server”。但是,这并没有真正的帮助,因为您希望将事件绑定到此控件,但在回发时,此控件将不再存在。

是否有原因不使用DataGrid实现此UI?