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[英]How to show the loading image before page_load event in asp.net 4?
[英]How to get an ASP.NET page_load event to trigger AJAX UpdatePanel update
我在ASP.NET中有一個頁面,上面有一些updatepanel。 頁面加載后,我希望updatepanels觸發updatepanels更新。
我正在使用這個答案,說這個Javascript在頁面上。
$(document).ready(function () {
window.__doPostBack('<%= hiddenAsyncTrigger.ClientID %>', 'OnClick');
});
但是,這會導致click事件被垃圾郵件,因為load事件正在觸發antoher load ...
更新面板都運行正常,問題是在頁面加載后觸發更新一次
使用客戶端控件而不是服務器端:
<%@ Page Language="C#" %>
<script runat="server">
protected string CurrentTime()
{
return DateTime.Now.ToString();
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>Untitled Page</title>
<script src="http://code.jquery.com/jquery-1.9.1.js"></script>
<script language="JavaScript">
$(document).ready(function () {
$("#Updater").click()
});
</script>
</head>
<body>
<form id="MyForm" runat="server">
<div>
Outside the panel: <%=CurrentTime() %>
</div>
<br />
<br />
<asp:ScriptManager ID="ScriptManager1" EnablePartialRendering="true" runat="server" />
<asp:UpdatePanel ID="panel" runat="server" UpdateMode="conditional">
<ContentTemplate>
<div>
Inside the panel: <%=CurrentTime() %>
</div>
<input type="submit" id="Updater" style="display: none" />
</ContentTemplate>
</asp:UpdatePanel>
</form>
</body>
</html>
另一種解決方案 - 沒有隱藏觸發器,使用__doPostBack
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm1.aspx.cs" Inherits="WebApplicationTest.WebForm1" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
<title>Untitled Page</title>
<script src="http://code.jquery.com/jquery-1.9.1.js"></script>
<script language="JavaScript">
$(document).ready(function () {
__doPostBack('panel', '');
});
</script>
</head>
<body>
<form id="form1" runat="server">
<div>
Outside the panel: <%=CurrentTime() %>
</div>
<br />
<br />
<asp:ScriptManager ID="ScriptManager1" EnablePartialRendering="true" runat="server" />
<asp:UpdatePanel ID="panel" runat="server" UpdateMode="conditional">
<ContentTemplate>
<div>
Inside the panel: <%=CurrentTime() %>
</div>
<input type="submit" id="Updater" style="display: none" />
</ContentTemplate>
</asp:UpdatePanel>
</form>
</body>
</html>
using System.Web.UI;
using System.Web.UI.WebControls;
namespace WebApplicationTest
{
public partial class WebForm1 : System.Web.UI.Page
{
protected string CurrentTime()
{
System.Diagnostics.Debug.WriteLine("CurrentTime was called");
return DateTime.Now.ToString();
}
protected void Page_Load(object sender, EventArgs e)
{
System.Diagnostics.Debug.WriteLine("PageLoad was called");
}
}
}
使用Javascript觸發更新面板中的隱藏按鈕,結束解決此問題
JS
var timer;
var polling_interval = 30000;
$(document).ready(function () {
TriggerUpdatePanelUpdate();// update as soon as DOM is ready
StartPolling();
});
function StartPolling() {
PollLoop();
}
function StopPolling() {
clearTimeout(timer);
}
function PollLoop() {
timer = setTimeout(
function() {
TriggerUpdatePanelUpdate();
PollLoop();
},
polling_interval
);
}
function TriggerUpdatePanelUpdate() {
document.getElementById('hiddenAsyncTrigger').click();
}
HTML
<asp:Button ID="hiddenAsyncTrigger" runat="server" OnClick="DoWork" Text="AsyncUpdate" style="display: none;"/>
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