CheckBoxList的AutoPostBack属性

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中国搜首页 >>ASP.NET代码>>CheckBoxList的AutoPostBack属性

如果允许CheckBoxList控件的AutoPostBack属性，只要有复选框被选定和取消选定，那么保含该CheckBoxList的表单就被提交。
程序清单中，在用户选定一个新的复选框时，就触发SelectedIndexChanged事件。该事件与chklFavoriteFoods_SelectedIndexChanged子程序关联，因此只要选定了新的复选框，页面就自动被提交到服务器，chklFavoriteFoods_SelectedIndexChanged子程序就被执行。

Sub chklFavoriteFoods_SelectedIndexChanged( s As Object, e As EventArgs )
  Dim itmFood As ListItem
  Dim strList As String

For each itmFood in chklFavoriteFoods.Items
    If itmFood.Selected Then
      strList &= "<li>" & itmFood.Text
    End If
  Next
  lblFoodList.Text = strList
End Sub

</Script>

<html>
<head><title>CheckBoxListAutoPostBack.aspx</title></head>
<body>

<asp:CheckBoxList
  ID="chklFavoriteFoods"
  AutoPostBack="True"
  OnSelectedIndexChanged="chklFavoriteFoods_SelectedIndexChanged"
  Runat="Server">
  <asp:ListItem Text="Pizza" />
  <asp:ListItem Text="Hamburgers" Selected="True"/>
  <asp:ListItem Text="Pasta"/>
</asp:CheckBoxList>

<hr>

You like to eat:
<asp:Label
  ID="lblFoodList"
  Runat="Server" />

</form>

<script type="text/javascript"></script>
<script type="text/javascript"
  src="http://pagead2.googlesyndication.com/pagead/show_ads.js">
</script>

</body>
</html>

运行演示代码

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