取消一个正在执行的异步回发
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取消一个正在执行的异步回发
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javascript代碼：
?????//pageLoad函數在成功更新后隱藏提示面板
?????function?pageLoad()?
??????{
??????showmessage("false","");
??????}
????//設定當引發initializeRequest事件時便執行事件處理函數CheckStatus
????Sys.WebForms.PageRequestManager.getInstance().add_initializeRequest(CheckStatus);
?????function?CheckStatus(sender,args)
?????{
?????//取得PageRequestManager類的實例
?????var?prm=Sys.WebForms.PageRequestManager.getInstance();
?????//判斷是否在進行異步回發且點擊了“取消”按鈕，就調用PageRequestManager的abortPostBack方法取消異步回發
?????if(prm.get_isInAsyncPostBack()?&?args.get_postBackElement().id=='LinkButton1')
?????{
????????prm.abortPostBack();
????????//隱藏提示面板
????????showmessage("false","");
?????}
?????//判斷是否在進行異步回發并且又單擊了發送異步回發按鈕此時取消新的異步回送并顯示正在處理先前的請求
?????else?if(prm.get_isInAsyncPostBack()?&?args.get_postBackElement().id=='Button1')
?????{
?????args.set_cancel(true);
?????showmessage("true","仍在處理先前的請求");
?????}
?????//提示正在取得數據
?????else?if(!prm.get_isInAsyncPostBack()?&?args.get_postBackElement().id=='Button1')
?????{
???????showmessage("true","正在取得數據");
?????}
?????}
?????//顯示與隱藏提示信息
?????function?showmessage(visiable,msg)
?????{
?????if(visiable=="true")
?????{?
???????var?loading=$get("loading");
???????loading.style.visibility='visible';
???????$get("message").innerHTML=msg;
?????}
?????if(visiable=="false")
?????{?
???????var?loading=$get("loading");
???????loading.style.visibility='hidden';
???????$get("message").innerHTML=msg;
?????}
?????}
?????if?(typeof(Sys)?!==?'undefined')?Sys.Application.notifyScriptLoaded();
前臺頁面主要代碼：
<body>
????<form?id="form1"?runat="server">
????<div?align="center"??>
????????<asp:ScriptManager?ID="ScriptManager1"?runat="server"?>
????????????<Scripts>
????????????????<asp:ScriptReference?Path="ClientControl.js"?/>
????????????</Scripts>
????????</asp:ScriptManager>
????????<asp:Button?ID="Button1"?runat="server"?Text="獲取時間"?onclick="Button1_Click"?/>
????????<br?/>
????????<div?id="loading"?align="left"?style="?visibility:?hidden;">
????????????<img?alt=""?src="progressbar_long.gif"??/><span?id="message"></span>
????????????<asp:LinkButton?ID="LinkButton1"?runat="server">取消</asp:LinkButton>
????????</div>
????????<asp:UpdatePanel?ID="UpdatePanel1"?runat="server"?UpdateMode="Conditional">
????????????<ContentTemplate>
?????
????????????????<span>當前時間：</span><asp:Label?ID="Label1"?runat="server"?Text=""></asp:Label>
?????
????????????</ContentTemplate>
????????????<Triggers>
????????????????<asp:AsyncPostBackTrigger?ControlID="Button1"?EventName="Click">
????????????????</asp:AsyncPostBackTrigger>
????????????????<asp:AsyncPostBackTrigger?ControlID="LinkButton1"?EventName="Click"?/>
????????????</Triggers>
????????</asp:UpdatePanel>
????</div>
????</form>
</body>
Button1_Click事件代碼：
????protected?void?Button1_Click(object?sender,?EventArgs?e)
????{
????????//刻意暫停6S
????????System.Threading.Thread.Sleep(6000);
????????Label1.Text?=?DateTime.Now.ToString();
????}
?????//pageLoad函數在成功更新后隱藏提示面板
?????function?pageLoad()?
??????{
??????showmessage("false","");
??????}
????//設定當引發initializeRequest事件時便執行事件處理函數CheckStatus
????Sys.WebForms.PageRequestManager.getInstance().add_initializeRequest(CheckStatus);
?????function?CheckStatus(sender,args)
?????{
?????//取得PageRequestManager類的實例
?????var?prm=Sys.WebForms.PageRequestManager.getInstance();
?????//判斷是否在進行異步回發且點擊了“取消”按鈕，就調用PageRequestManager的abortPostBack方法取消異步回發
?????if(prm.get_isInAsyncPostBack()?&?args.get_postBackElement().id=='LinkButton1')
?????{
????????prm.abortPostBack();
????????//隱藏提示面板
????????showmessage("false","");
?????}
?????//判斷是否在進行異步回發并且又單擊了發送異步回發按鈕此時取消新的異步回送并顯示正在處理先前的請求
?????else?if(prm.get_isInAsyncPostBack()?&?args.get_postBackElement().id=='Button1')
?????{
?????args.set_cancel(true);
?????showmessage("true","仍在處理先前的請求");
?????}
?????//提示正在取得數據
?????else?if(!prm.get_isInAsyncPostBack()?&?args.get_postBackElement().id=='Button1')
?????{
???????showmessage("true","正在取得數據");
?????}
?????}
?????//顯示與隱藏提示信息
?????function?showmessage(visiable,msg)
?????{
?????if(visiable=="true")
?????{?
???????var?loading=$get("loading");
???????loading.style.visibility='visible';
???????$get("message").innerHTML=msg;
?????}
?????if(visiable=="false")
?????{?
???????var?loading=$get("loading");
???????loading.style.visibility='hidden';
???????$get("message").innerHTML=msg;
?????}
?????}
?????if?(typeof(Sys)?!==?'undefined')?Sys.Application.notifyScriptLoaded();
前臺頁面主要代碼：
<body>
????<form?id="form1"?runat="server">
????<div?align="center"??>
????????<asp:ScriptManager?ID="ScriptManager1"?runat="server"?>
????????????<Scripts>
????????????????<asp:ScriptReference?Path="ClientControl.js"?/>
????????????</Scripts>
????????</asp:ScriptManager>
????????<asp:Button?ID="Button1"?runat="server"?Text="獲取時間"?onclick="Button1_Click"?/>
????????<br?/>
????????<div?id="loading"?align="left"?style="?visibility:?hidden;">
????????????<img?alt=""?src="progressbar_long.gif"??/><span?id="message"></span>
????????????<asp:LinkButton?ID="LinkButton1"?runat="server">取消</asp:LinkButton>
????????</div>
????????<asp:UpdatePanel?ID="UpdatePanel1"?runat="server"?UpdateMode="Conditional">
????????????<ContentTemplate>
?????
????????????????<span>當前時間：</span><asp:Label?ID="Label1"?runat="server"?Text=""></asp:Label>
?????
????????????</ContentTemplate>
????????????<Triggers>
????????????????<asp:AsyncPostBackTrigger?ControlID="Button1"?EventName="Click">
????????????????</asp:AsyncPostBackTrigger>
????????????????<asp:AsyncPostBackTrigger?ControlID="LinkButton1"?EventName="Click"?/>
????????????</Triggers>
????????</asp:UpdatePanel>
????</div>
????</form>
</body>
Button1_Click事件代碼：
????protected?void?Button1_Click(object?sender,?EventArgs?e)
????{
????????//刻意暫停6S
????????System.Threading.Thread.Sleep(6000);
????????Label1.Text?=?DateTime.Now.ToString();
????}
轉載于:https://www.cnblogs.com/dushouke/archive/2008/06/03/1212757.html
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