updatepanel之后的“上次刷新”消息

时间:2013-11-13 17:30:33

标签: javascript html asp.net vb.net

我似乎无法找到我需要的东西所以我会问。

我有一个页面将使用ASP:Updatepanel和timer_tick事件每5-10分钟左右自动更新一次。我只是在寻找一条类似的信息:

    Last refresh was at:
    <script>document.write(document.lastModified);</script>

或类似的东西。 有什么建议吗?

2 个答案:

答案 0 :(得分:0)

尝试使用在服务器执行页面加载时更新的ASP.NET服务器控件(即Label),如下所示:

标记:

<asp:UpdatePanel>
    ...
    <asp:Label id="LabelLastUpdated" runat="server" />
</asp:UpdatePanel>

代码隐藏:

Sub Page_Load(ByVal Sender As System.Object, ByVal e As System.EventArgs)
    ' Do update of data here and set last updated label to current time
    LabelLastUpdated.Text = "Last refresh was at: " & DateTime.Now.ToString("F")
End Sub

注意:"F"是完整的日期/时间模式(长时间)。请阅读Standard Date and Time Format Strings以获取更多信息。


更新:

要使用这是一个母版页方案,其中任何内容页面刷新都会导致标签更新,然后尝试:

母版页的标记:

<html>
    <head>

    </head>
    <body>
        ... Existing content ...
        <asp:Label id="LabelLastUpdated" runat="server" />
    </body>
</html>

母版页的代码隐藏:

Sub Page_Load(ByVal Sender As System.Object, ByVal e As System.EventArgs)
    ' Do update of data here and set last updated label to current time
    LabelLastUpdated.Text = "Last refresh was at: " & DateTime.Now.ToString("F")
End Sub

对于您希望内容页面告知主页面更新的母版页场景,请尝试以下操作:

母版页的标记:

<html>
    <head>

    </head>
    <body>
        ... Existing content ...
        <asp:Label id="LabelLastUpdated" runat="server" />
    </body>
</html>

母版页的代码隐藏:

Sub UpdateLastUpdatedLabel()
    ' A content page is telling the last updated label to be set 
    ' to the current time
    LabelLastUpdated.Text = "Last refresh was at: " & DateTime.Now.ToString("F")
End Sub

在内容页面的代码隐藏中:

Page_Load或您希望用作更新母版页标签的触发器的任何其他事件中,请执行以下操作:

' Get a reference to the master page
Dim masterPage = DirectCast(Page.Master, YourMasterPageClassName)

' Now you can call the master page's UpdateLastUpdatedLabel method
' which will update the label's text to the current date/time
masterPage.UpdateLastUpdatedLabel()

答案 1 :(得分:0)

请尝试按照定期更新的代码

在aspx页面中:

<asp:ScriptManager runat="server" id="ScriptManager1">
</asp:ScriptManager>
<asp:UpdatePanel runat="server" id="UpdatePanel1">
  <ContentTemplate>
    <asp:Timer runat="server" id="Timer1" Interval="10000" OnTick="Timer1_Tick"></asp:Timer>
   <asp:Label runat="server" Text="Page not refreshed yet." id="LabelLastUpdated">
   </asp:Label>
  </ContentTemplate>
</asp:UpdatePanel>

在代码隐藏文件中添加以下代码:

    protected void Timer1_Tick(object sender, EventArgs e)
    {
        LabelLastUpdated.Text = "Last Modified at: " +DateTime.Now.ToLongTimeString();
    }