[GridView]客製化GridView的Caption

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  • 2008-12-29

[GridView]客製化GridView的Caption

這概念其實也沒什麼,就是把GridView的Caption屬性,塞HTML跟CSS。

以我們常用的用法來說,GridView的Caption(基本上他們會講Table的Title)擺放的位置有三種,置左、置中、置右。

而且是會同時發生,也就是左、中、右可能都各自有值。左邊可能擺放整個頁面的段落,中間可能是GridView的表格說明,右邊可能是GridView的單位。

這時候原生的Caption屬性就會有點礙手礙腳。

Caption屬性Render到HTML上,是<caption></caption>,當你塞第二個<caption>他就會在不同列呈現。

所以最簡單的方法,還是塞一個table的HTML進去。

示範一下囉唆的作法,建立3個屬性,分別是置左、置中、置右的Text,再建立3個屬性,是三格的CSS。

        Private _strCaptionLeft As String = String.Empty
        Private _strCaptionCenter As String = String.Empty
        Private _strCaptionRight As String = String.Empty
        Private _strCssCaptionLeft As String = String.Empty
        Private _strCssCaptionCenter As String = String.Empty
        Private _strCssCaptionRight As String = String.Empty

        <Category("Caption")> _
        Public Property CssCaptionLeft() As String
            Get
                Return _strCssCaptionLeft
            End Get
            Set(ByVal value As String)
                _strCssCaptionLeft = value
            End Set
        End Property

        <Category("Caption")> _
        Public Property CssCaptionCenter() As String
            Get
                Return _strCssCaptionCenter
            End Get
            Set(ByVal value As String)
                _strCssCaptionCenter = value
            End Set
        End Property

        <Category("Caption")> _
        Public Property CssCaptionRight() As String
            Get
                Return _strCssCaptionRight
            End Get
            Set(ByVal value As String)
                _strCssCaptionRight = value
            End Set
        End Property

        <Category("Caption")> _
        Public Property CaptionLeft() As String
            Get
                Return _strCaptionLeft
            End Get
            Set(ByVal value As String)
                _strCaptionLeft = value
            End Set
        End Property

        <Category("Caption")> _
        Public Property CaptionCenter() As String
            Get
                Return _strCaptionCenter
            End Get
            Set(ByVal value As String)
                _strCaptionCenter = value
            End Set
        End Property

        <Category("Caption")> _
        Public Property CaptionRight() As String
            Get
                Return _strCaptionRight
            End Get
            Set(ByVal value As String)
                _strCaptionRight = value
            End Set
        End Property

接著在GridView的OnPreRnder()裡,去覆寫Grid的Caption屬性即可。

倘若不想影響到舊有的caption屬性,可以額外加個判斷避掉。

Protected Overrides Sub OnPreRender(ByVal e As System.EventArgs)
            MyBase.OnPreRender(e)

            If Me.Caption = String.Empty Then
                '25% 50% 25%的td,可由外面設定CSS取代。
                'Dim strAllCaption As String = "<table width=""100%""><tr><td align=""left"" style=""width:25%;"" class=""" & Me.CssCaptionLeft & """>" & Me.CaptionLeft & "</td><td align=""center"" style=""width:50%;"" class=""" & Me.CssCaptionCenter & """>" & Me.CaptionCenter & "</td><td align=""right"" style=""width:25%;"" class=""" & Me.CssCaptionRight & """>" & Me.CaptionRight & "</td></tr></table>"
                Dim strAllCaption As String = "<table width=""100%""><tr><td align=""left""  class=""" & Me.CssCaptionLeft & """>" & Me.CaptionLeft & "</td><td align=""center""  class=""" & Me.CssCaptionCenter & """>" & Me.CaptionCenter & "</td><td align=""right""  class=""" & Me.CssCaptionRight & """>" & Me.CaptionRight & "</td></tr></table>"
                Me.Caption = strAllCaption
            End If
End Sub

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