我已经在我的网站下面的code：

I have the following code on my website:

    <asp:ScriptManager ID="ScriptManager1" runat="server" />
    <asp:UpdatePanel runat="server" id="UpdatePanel" updatemode="Conditional">
    <Triggers>
        <asp:AsyncPostBackTrigger controlid="myButton_btn" eventname="Click" />
    </Triggers>
        <ContentTemplate>
            <script>
                function pageLoad(){
                    window.alert("<%=Session("myVariable")%>"); 
                    }
                }
            </script>

        </ContentTemplate>
    </asp:UpdatePanel>

    <asp:Button ID="myButton_btn" Text="Prev Month" runat="server"></asp:Button>

JavaScript的运行每次我点击按钮。不过，即使我的子程序点击按钮后更新会话变量，我总是得到同样的警告。换言之，相同的JavaScript是回发后运行，并且它不被更新。我肯定的会话变量正在改变。有谁知道为什么发生这种情况？我AP preciate您的输入！

The javascript is running everytime I click the button. However, even though my subroutine updates the session variable after clicking the button, I always get the same alert. In other words, the same javascript is run after postback, and it is not updated. I am positive that the session variable IS being changed. Does anyone know why this is happening? I appreciate your input!

感谢你了！

推荐答案

在按钮处理程序试试这个：

Try this in the button-handler:

VB.Net

ScriptManager.RegisterStartupScript(Me.UpdatePanel, GetType(string), "alertScript", String.Format("alert('{0}');",Session("myVariable")), true)

C＃

ScriptManager.RegisterStartupScript(this.UpdatePanel, typeof(string), "alertScript", string.Format("alert('{0}');", Session["myVariable"]), true);