通过


BulletedList.Target 属性

定义

获取或设置在单击控件中的 BulletedList 超链接时要在其中显示链接到的网页内容的目标窗口或框架。

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

属性值

在单击超链接 BulletedList 时加载链接到的网页的目标窗口或框架。 默认值为空字符串(“)。

属性

示例

下面的代码示例演示如何创建 BulletedList 控件并设置 Target 属性。 当用户从列表框中选择 HyperLink 显示模式时,属性 Target 设置为 _blank 在新浏览器窗口中显示链接页。

<%@ 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>

注解

值必须以 A 到 Z 范围内的字母开头(不区分大小写),下表中列出的特殊值除外,以下划线开头。

价值 说明
_blank 在不带框架的新窗口中呈现内容。
_parent 呈现即时帧集父级中的内容。
_search 在搜索窗格中呈现内容。
_self 呈现具有焦点的帧中的内容。
_top 在全窗口中呈现内容,而不显示框架。

注释

检查浏览器文档以确定值是否 _search 受支持。 例如,Microsoft Internet Explorer 5.0 及更高版本支持 _search 目标值。

使用该 Target 属性指定显示单击控件中的 BulletedList 超链接时链接到的网页的框架或窗口。 若要将列表项的内容显示为控件中的 BulletedList 超链接,请将 BulletedListDisplayMode 属性设置为值 HyperLink。 然后,将 Value 每个列表项的属性设置为要导航到的网页的 URL。

如果未设置该 Target 属性,则单击超链接时,具有焦点的浏览器或窗口将刷新。

注释

Target 属性呈现为 target 属性。 target XHTML 1.1 文档类型定义中不允许元素上的anchor属性。 如果呈现的 XHTML 1.1 输出符合 XHTML 1.1,BulletedList则不要设置Target该属性。 有关详细信息,请参阅 Visual Studio 中的 XHTML 标准主题和 ASP.NET

创建可访问的网页时,强烈建议避免使用属性 Target 来定位另一个窗口。 有关详细信息,请参阅 Visual Studio 中的辅助功能和 ASP.NET

此属性的值存储在视图状态中。

适用于

另请参阅