javascript - 响应后调用提醒。结束

Question

这是我的代码，我试图在响应后显示警报。但没有显示操作系统警报

string filepath =  ConfigurationManager.AppSettings["USPPath"].ToString() + urlPDF;
                FileInfo file = new FileInfo(Server.MapPath(filepath));

if (file.Exists)
{
ClientScript.RegisterStartupScript(this.GetType(), "somekey", "alert('Some data missing!');", true);   
Response.ClearContent();
Response.AddHeader("Content-Disposition", "attachment; filename=" + file.Name);

Response.AddHeader("Content-Length", file.Length.ToString());
Response.ContentType = "application/pdf";
Response.TransmitFile(file.FullName);
try
{
    Response.Flush();
    ClientScript.RegisterStartupScript(this.GetType(), "somekeyqw","alert('Some data missing!'); ", true);
   // DisplaySucessAlert(true, "Shipping Label downloaded successfully.");
   // ScriptManager.RegisterStartupScript(this, this.GetType(), "Popalertxs", "normalalert();", true);
}
 finally
 {
  // DisplaySucessAlert(true, "Shipping Label downloaded successfully.");
  //  ScriptManager.RegisterStartupScript(this, this.GetType(), "Popalert", "normalalert();", true);
 }
}

我使用了更新面板，html 代码看起来像

<asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Conditional">
 <ContentTemplate>
<asp:Button ID="btnuspsgenerate" class="btn-def" runat="server" Text="Download USPS label" OnClick="btnuspsgenerate_Click" />  

</ContentTemplate>
<Triggers>
    <asp:PostBackTrigger ControlID="btnuspsgenerate" />
</Triggers>
</asp:UpdatePanel>

我的 pdf 文件已下载，但未显示警报。这里我用了很多方法都无法显示alert。

我评论了一些代码，因为它们不起作用

Answer 1

当你使用更新面板时，你不能像这样调用javascript..

尝试以下代码，

string CloseWindow;       
CloseWindow = "alert('Hello World')"; 
ScriptManager.RegisterStartupScript(UpdatePanelID,UpdatePanelID.GetType(), "CloseWindow", CloseWindow, true);