Panel.ScrollBars 属性

参考

定义

命名空间:: System.Web.UI.WebControls

程序集:: System.Web.dll

重要

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获取或设置 Panel 控件中滚动条的可见性和位置。

public:
 virtual property System::Web::UI::WebControls::ScrollBars ScrollBars { System::Web::UI::WebControls::ScrollBars get(); void set(System::Web::UI::WebControls::ScrollBars value); };

public virtual System.Web.UI.WebControls.ScrollBars ScrollBars { get; set; }

member this.ScrollBars : System.Web.UI.WebControls.ScrollBars with get, set

Public Overridable Property ScrollBars As ScrollBars

属性值

ScrollBars

ScrollBars 枚举值之一。默认值为 None。

示例

下面的代码示例演示如何以声明方式将 ScrollBars 属性设置为 Auto。面板包含一个表，其整个内容超过了面板的大小。这会导致在呈现面板时自动显示垂直和水平滚动条。然后，用户可以滚动以查看表中的所有数据。

注意

下面的代码示例使用单文件代码模型，如果直接复制到代码隐藏文件中，可能无法正常工作。此代码示例必须复制到扩展名为 .aspx 的空文本文件中。有关 Web 窗体代码模型的详细信息，请参阅 ASP.NET Web 窗体页代码模型。

<%@ Page Language="C#" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" 
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<script runat="server">
    private void Page_Load(object sender, EventArgs e)
    {
        // Add more rows and columns to the table than can
        // be displayed in the panel area.
        // Scroll bars will be required to view all the data.

        // Add rows and columns to the table.
        for (int rowNum = 0; rowNum < 51; rowNum++)
        {
            TableRow tempRow = new TableRow();
            for (int cellNum = 0; cellNum < 11; cellNum++)
            {
                TableCell tempCell = new TableCell();
                tempCell.Text = 
                    String.Format("({0}, {1})", rowNum, cellNum);
                tempRow.Cells.Add(tempCell);
            }
            Table1.Rows.Add(tempRow);
        }
    }
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head2" runat="server">
    <title>Panel Scrollbars - C# Example</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>

    <h3>Panel.ScrollBars Property Example</h3>        

    <asp:Panel ID="Panel1" runat="Server"
      Height="300px" Width="400px"
      BackColor="Aqua" ScrollBars="Auto">

      <asp:Table ID="Table1" runat="Server"></asp:Table>  

    </asp:Panel>         

    </div>
    </form>
</body>
</html>

<%@ Page Language="VB" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" 
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<script runat="server">
    Private Sub Page_Load(ByVal sender As Object, _
        ByVal e As System.EventArgs)

        ' Add more rows and columns to the table than can
        ' be displayed in the panel area.
        ' Scroll bars will be required to view all the data.

        ' Add rows and columns to the table.
        Dim rowNum As Integer
        For rowNum = 0 To 50
            Dim tempRow As New TableRow
            Dim cellNum As Integer
            For cellNum = 0 To 10
                Dim tempCell As New TableCell
                tempCell.Text = _
                    String.Format("({0}, {1})", rowNum, cellNum)
                tempRow.Cells.Add(tempCell)
            Next
            Table1.Rows.Add(tempRow)
        Next
    End Sub
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head2" runat="server">
    <title>Panel Scrollbars - VB.NET Example</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>

    <h3>Panel.ScrollBars Property Example</h3>        

    <asp:Panel ID="Panel1" runat="Server"
      Height="300px" Width="400px"
      BackColor="Aqua" ScrollBars="Auto">

      <asp:Table ID="Table1" runat="Server"></asp:Table>  

    </asp:Panel>         

    </div>
    </form>
</body>
</html>

下面的代码示例演示如何以编程方式设置 ScrollBars 属性。控件 ListBox 使用 ScrollBars 枚举值填充。根据用户从列表框中选择的值，面板中显示的滚动条会发生变化。

注意

<%@ Page Language="C#" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" 
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<script runat="server">
    private void Page_Load(object sender, EventArgs e)
    {
        // Add more rows and columns to the table than can
        // be displayed in the panel area.
        // Scroll bars will be required to view all the data.

        // Add rows and columns to the table.
        for (int rowNum = 0; rowNum < 51; rowNum++)
        {
            TableRow tempRow = new TableRow();
            for (int cellNum = 0; cellNum < 11; cellNum++)
            {
                TableCell tempCell = new TableCell();
                tempCell.Text = 
                    String.Format("({0}, {1})", rowNum, cellNum);
                tempRow.Cells.Add(tempCell);
            }
            Table1.Rows.Add(tempRow);
        }
    }

    private void ListBox1_SelectedIndexChanged(object sender, EventArgs e)
    {
        // Determine which list item was clicked.
        // Display the selected scroll bars in the panel.
        switch (ListBox1.SelectedIndex)
        {
            case 0:
                Panel1.ScrollBars = ScrollBars.None;
                break;
            case 1:
                Panel1.ScrollBars = ScrollBars.Horizontal;
                break;
            case 2:
                Panel1.ScrollBars = ScrollBars.Vertical;
                break;
            case 3:
                Panel1.ScrollBars = ScrollBars.Both;
                break;
            case 4:
                Panel1.ScrollBars = ScrollBars.Auto;
                break;
            default:
                throw new Exception("Select a valid list item.");
        }
    }
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head2" runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <div>

    <h3>Panel.ScrollBars Property Example</h3>

    <h4>Select the scrollbars to display in the panel.</h4>
    <asp:ListBox ID="ListBox1" runat="Server"
      Rows="5" AutoPostBack="True"
      SelectionMode="Single"
      OnSelectedIndexChanged="ListBox1_SelectedIndexChanged">
      <asp:ListItem>None</asp:ListItem>
      <asp:ListItem>Horizontal</asp:ListItem> 
      <asp:ListItem>Vertical</asp:ListItem>
      <asp:ListItem>Both</asp:ListItem> 
      <asp:ListItem>Auto</asp:ListItem>              
    </asp:ListBox>

    <hr />              

    <asp:Panel ID="Panel1" runat="Server"
      Height="300px" Width="400px" BackColor="Aqua">
      <asp:Table ID="Table1" runat="Server" />
    </asp:Panel>           
         
    </div>
    </form>
</body>
</html>

<%@ Page Language="VB" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" 
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<script runat="server">
    Private Sub Page_Load(ByVal sender As Object, _
        ByVal e As System.EventArgs)

        ' Add more rows and columns to the table than can
        ' be displayed in the panel area.
        ' Scroll bars will be required to view all the data.

        ' Add rows and columns to the table.
        Dim i As Integer
        For i = 0 To 50
            Dim tempRow As New TableRow
            Dim j As Integer
            For j = 0 To 10
                Dim tempCell As New TableCell
                tempCell.Text = "(" & i & "," & j & ")"
                tempRow.Cells.Add(tempCell)
            Next j
            Table1.Rows.Add(tempRow)
        Next i
    End Sub

    Sub ListBox1_SelectedIndexChanged(ByVal sender As Object, _
        ByVal e As EventArgs)

        ' Determine which list item was clicked.
        ' Display the selected scroll bars in the panel.
        Select Case (ListBox1.SelectedIndex)
            Case 0
                Panel1.ScrollBars = ScrollBars.None
            Case 1
                Panel1.ScrollBars = ScrollBars.Horizontal
            Case 2
                Panel1.ScrollBars = ScrollBars.Vertical
            Case 3
                Panel1.ScrollBars = ScrollBars.Both
            Case 4
                Panel1.ScrollBars = ScrollBars.Auto
            Case Else
                Throw New Exception("Select a valid list item.")
        End Select

    End Sub
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head2" runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <div>

    <h3>Panel.ScrollBars Property Example</h3>

    <h4>Select the scrollbars to display in the panel.</h4>
    <asp:ListBox ID="ListBox1" runat="Server"
      Rows="5" AutoPostBack="True" SelectionMode="Single"
      OnSelectedIndexChanged="ListBox1_SelectedIndexChanged">
      <asp:ListItem>None</asp:ListItem>
      <asp:ListItem>Horizontal</asp:ListItem> 
      <asp:ListItem>Vertical</asp:ListItem>
      <asp:ListItem>Both</asp:ListItem> 
      <asp:ListItem>Auto</asp:ListItem>              
    </asp:ListBox>

    <hr />              

    <asp:Panel ID="Panel1" runat="Server"
      Height="300px" Width="400px" BackColor="Aqua">
      <asp:Table ID="Table1" runat="Server" />
    </asp:Panel>           
         
    </div>
    </form>
</body>
</html>

注解

ScrollBars使用属性可指定控件中Panel滚动条的可见性和位置。此属性是使用枚举值之一设置的 ScrollBars 。下表列出了可能的值。

值	说明
`None`	不显示任何滚动条。
`Horizontal`	仅显示水平滚动条。
`Vertical`	仅显示垂直滚动条。
`Both`	同时显示水平滚动条和垂直滚动条。
`Auto`	如有必要，将显示水平滚动条、垂直滚动条或同时显示两个滚动条。要不然也可以不显示任何滚动条。

如果为属性指定 Auto ，则当控件中Panel内容的大小超过控件本身的大小Panel时，将自动显示滚动ScrollBars条。例如，如果控件 Panel 包含表，并且面板不够宽，无法显示表中的所有行，则会显示垂直滚动条。如果表格的大小超过面板的高度和宽度，则会同时显示垂直和水平滚动条。

注意

此属性仅在支持 HTML 4.0 或更高版本的浏览器上受支持。

适用于

另请参阅

ScrollBars

通过

Panel.ScrollBars 属性

定义

属性值

示例

注解

适用于

另请参阅

其他资源