BulletedList.Target 屬性

定義

命名空間:: System.Web.UI.WebControls

組件:: System.Web.dll

重要

部分資訊涉及發行前產品，在發行之前可能會有大幅修改。 Microsoft 對此處提供的資訊，不做任何明確或隱含的瑕疵擔保。

當點擊控制項中的 BulletedList 超連結時，會取得或設定顯示網頁內容的目標視窗或框架。

public:
 virtual property System::String ^ Target { System::String ^ get(); void set(System::String ^ value); };

[System.ComponentModel.TypeConverter(typeof(System.Web.UI.WebControls.TargetConverter))]
public virtual string Target { get; set; }

[<System.ComponentModel.TypeConverter(typeof(System.Web.UI.WebControls.TargetConverter))>]
member this.Target : string with get, set

Public Overridable Property Target As String

屬性值

String

點擊超連結 BulletedList 時，載入網頁的目標視窗或框架。預設為空字串（“”）。

屬性: TypeConverterAttribute

範例

以下程式碼範例示範如何建立 BulletedList 控制項並設定屬性 Target 。當使用者從清單框中選擇 HyperLink 顯示模式時，該 Target 屬性會設定為 _blank 在新的瀏覽器視窗中顯示連結頁面。

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

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
  <title>DisplayMode Example</title>
<script runat="server">
  
  void Index_Changed(object sender, System.EventArgs e)
  {

      // Change the message displayed, based on 
      // the display mode selected from the list box.
      if (DisplayModeListBox.SelectedIndex > -1)
      {
          Message1.Text = "You chose: " + DisplayModeListBox.SelectedItem.Text;
      }

      // Change the display mode, based on 
      // the mode selected from the list box.
      switch (DisplayModeListBox.SelectedIndex) 
    {
          case 0:
              ItemsBulletedList.DisplayMode = BulletedListDisplayMode.Text;
              Message2.Text = "";
              break;
          case 1:
              ItemsBulletedList.DisplayMode = BulletedListDisplayMode.HyperLink;
              // Opens a new browser window to display the page linked to.
              ItemsBulletedList.Target = "_blank";
              Message2.Text = "";
              break;
          case 2:
              ItemsBulletedList.DisplayMode = BulletedListDisplayMode.LinkButton;
              break;
          default:
              throw new Exception("You did not select a valid display mode.");
              break;
      }

  }

  void ItemsBulletedList_Click(object sender, System.Web.UI.WebControls.BulletedListEventArgs e)
  {

      // Change the message displayed, based on the index
      // of the bulletedlist list item that was clicked.
      switch (e.Index) 
    {
          case 0:
              Message2.Text = "You  clicked list item 1.";
              break;
          case 1:
              Message2.Text = "You  clicked list item 2.";
              break;
          case 2:
              Message2.Text = "You  clicked list item 3.";
              break;
          default:
              throw new Exception("You did not click a valid list item.");
              break;
      }

  }

</script>

</head>
<body>

  <h3>DisplayMode Example</h3>

  <form id="form1" runat="server">

    <h3>BulletedListDisplayMode Example</h3>

    <p>
    <asp:BulletedList id="ItemsBulletedList" 
      BulletStyle="Disc"
      DisplayMode="Text" 
      OnClick="ItemsBulletedList_Click"
      runat="server">    
      <asp:ListItem Value="http://www.cohowinery.com">Coho Winery</asp:ListItem>
      <asp:ListItem Value="http://www.contoso.com">Contoso, Ltd.</asp:ListItem>
      <asp:ListItem Value="http://www.tailspintoys.com">Tailspin Toys</asp:ListItem>
    </asp:BulletedList></p>

    <hr />

    <h4>Select from the list to change the display mode:</h4>
    <asp:ListBox id="DisplayModeListBox" 
      Rows="1"
      SelectionMode="Single"
      AutoPostBack="True"
      OnSelectedIndexChanged="Index_Changed"
      runat="server">
        <asp:ListItem>Text</asp:ListItem>
        <asp:ListItem>Hyperlink</asp:ListItem>
        <asp:ListItem>LinkButton</asp:ListItem>
    </asp:ListBox>

    <asp:Label id="Message1" 
      runat="server"
      AssociatedControlID="DisplayModeListBox"/><br /><br />

    <asp:Label id="Message2"
      runat="server"
      AssociatedControlID="DisplayModeListBox"/>

   </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">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
  <title>DisplayMode Example</title>
<script runat="server">

  Sub Index_Changed(ByVal sender As Object, ByVal e As System.EventArgs)

    ' Change the message displayed, based on 
    ' the display mode selected from the list box.
    If DisplayModeListBox.SelectedIndex > -1 Then
      Message1.Text = "You chose: " & DisplayModeListBox.SelectedItem.Text
    End If

    ' Change the display mode, based on 
    ' the mode selected from the list box.
    Select Case (DisplayModeListBox.SelectedIndex)
      Case 0
        ItemsBulletedList.DisplayMode = BulletedListDisplayMode.Text
        Message2.Text = ""
      Case 1
        ItemsBulletedList.DisplayMode = BulletedListDisplayMode.HyperLink
        ' Opens a new browser window to display the page linked to.
        ItemsBulletedList.Target = "_blank"
        Message2.Text = ""
      Case 2
        ItemsBulletedList.DisplayMode = BulletedListDisplayMode.LinkButton
      Case Else
        Throw New Exception("You did not select a valid display mode.")
    End Select

  End Sub

  Sub ItemsBulletedList_Click(ByVal sender As Object, _
                              ByVal e As System.Web.UI.WebControls.BulletedListEventArgs)

    ' Change the message displayed, based on the index
    ' of the bulletedlist list item that was clicked.
    Select Case (e.Index)
      Case 0
        Message2.Text = "You  clicked list item 1."
      Case 1
        Message2.Text = "You  clicked list item 2."
      Case 2
        Message2.Text = "You  clicked list item 3."
      Case Else
        Throw New Exception("You did not click a valid list item.")
    End Select

  End Sub

</script>

</head>
<body>

  <h3>DisplayMode Example</h3>

  <form id="form1" runat="server">

    <h3>BulletedListDisplayMode Example</h3>

    <p>
    <asp:BulletedList id="ItemsBulletedList" 
      BulletStyle="Disc"
      DisplayMode="Text" 
      OnClick="ItemsBulletedList_Click"
      runat="server">    
      <asp:ListItem Value="http://www.cohowinery.com">Coho Winery</asp:ListItem>
      <asp:ListItem Value="http://www.contoso.com">Contoso, Ltd.</asp:ListItem>
      <asp:ListItem Value="http://www.tailspintoys.com">Tailspin Toys</asp:ListItem>
    </asp:BulletedList></p>

    <hr />

    <h4>Select from the list to change the display mode:</h4>
    <asp:ListBox id="DisplayModeListBox" 
      Rows="1"
      SelectionMode="Single"
      AutoPostBack="True"
      OnSelectedIndexChanged="Index_Changed"
      runat="server">
        <asp:ListItem>Text</asp:ListItem>
        <asp:ListItem>Hyperlink</asp:ListItem>
        <asp:ListItem>LinkButton</asp:ListItem>
    </asp:ListBox>

    <asp:Label id="Message1" 
      runat="server"
      AssociatedControlID="DisplayModeListBox"/><br /><br />

    <asp:Label id="Message2"
      runat="server"
      AssociatedControlID="DisplayModeListBox"/>

   </form>

</body>
</html>

備註

值必須以 A 到 Z 範圍內的字母開頭（不區分大小寫），但下表中列出的特殊值以底線開頭。

價值	說明
`_blank`	它會在一個沒有框架的新視窗中渲染內容。
`_parent`	將內容渲染到直接的框架集父節點。
`_search`	在搜尋窗格中呈現內容。
`_self`	能在畫面中聚焦渲染內容。
`_top`	能在完整視窗中渲染內容，且不包含框架。

備註

請查看瀏覽器文件，確認該 _search 數值是否被支援。例如，Microsoft Internet Explorer 5.0 及以後版本支援目標 _search 值。

使用該 Target 屬性指定當點擊控制項中 BulletedList 超連結時，顯示所連結網頁的框架或視窗。若要在控制項中以超連結 BulletedList 形式顯示清單項目的內容，請將屬性設定 BulletedListDisplayMode 為值 HyperLink。接著，將每個清單項目的屬性設定 Value 為要導航的網頁網址。

如果 Target 該屬性未被設定，點擊超連結時，瀏覽器或帶有焦點的視窗會自動刷新。

備註

該 Target 屬性以屬性形式呈現 target 。 XHTML 1.1 文件類型定義中不允許元素屬性targetanchor。如果渲染輸出BulletedList必須符合 XHTML 1.1，請不要設定該Target屬性。欲了解更多資訊，請參閱 Visual Studio 與 ASP.NET 中的 XHTML 標準主題。

在建立無障礙網頁時，強烈建議避免使用該 Target 屬性來指向其他視窗。欲了解更多資訊，請參閱 Visual Studio 及 ASP.NET 中的無障礙功能。

此屬性的價值會儲存在視圖狀態。

適用於

另請參閱

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