ASP.NET 下载文件并继续执行JS解决方法
需求说明:当用户点击按钮时使当前按钮为不可用,并打开新页面,关闭新页面时,按钮变为可用。并且如果不关闭新页面,当前按钮过10秒钟自动变为可用。
包含3个页面:
一、按钮页
前台代码:当刷新后采用js进行disable后,点击的时候也可以用JS使其为disable,让整个过程都disable。(如果采用的是后台button.Enable=false,则不行,因为服务器端状态始终为false,导致按钮只能用一次。)
<%@ Page Language="VB" AutoEventWireup="false" CodeFile="Default2.aspx.vb" Inherits="Default2" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<script type="text/javascript" language="javascript"> function disableButton(button) {
var btn = document.getElementById(button);
setTimeout(function () {disable_in(btn); },);
}
function disable_in(button)
{
button.disabled=false;
}
function Enablebutton(buttonID) {
var button = document.getElementById(buttonID);
button.disabled = false;
}
function NotEnablebutton(buttonID) {
var button = document.getElementById(buttonID);
button.disabled = true;
} function disable_out(button) {
button.disabled = true;
} // function disableButton_Out(button) {
// setTimeout(function () { disable_out(button); }, 50);
// } </script>
<form id="form1" runat="server">
<div>
<asp:Button ID="Button1" runat="server" Text="Button" UseSubmitBehavior="false" OnClientClick="disable_out(this);"/>
<asp:Button ID="Button2" runat="server" Text="Button2" UseSubmitBehavior="false" OnClientClick="disable_out(this);"/>
</div>
</form>
</body>
</html>
后台代码:
这里用服务器端 Button1.Enabled = False代码, 当用JS还原为可用时,服务器端状态不会改变,因此多个按钮点击时会出现bug(点击第二个按钮时,第一个按钮会一起变为不可用)。所以这里将用js设置为不可用状态。
Protected Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click
Session("ImagePath") = "\\129.223.229.102\Dis_project\Temp\test.pdf"
'Session("ImagePath") = "\\129.223.229.102\Dis_project\Temp\test1.zip"
Session("CurrentButtonID") = Button1.ClientID
Session("IsPDF") = True
System.Threading.Thread.Sleep()
ClientScript.RegisterStartupScript(ClientScript.GetType(), "myscript1", String.Format("<script>disableButton('" & Button1.ClientID & "')</script>"))
ClientScript.RegisterStartupScript(ClientScript.GetType(), "myscript2", String.Format("<script>NotEnablebutton('" & Button1.ClientID & "');</script>"))
ClientScript.RegisterStartupScript(ClientScript.GetType(), "myscript", String.Format("<script>window.open('ShowPDF.aspx')</script>"))
'Button1.Attributes.Add("OnClientClick", String.Format("javascript:disableButton_Out(this);"))
'Button1.Enabled = False End Sub
二、下载(显示)页面
前台代码:
<%@ Page Language="VB" AutoEventWireup="false" CodeFile="ShowPDF.aspx.vb" Inherits="ShowPDF" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>ShowPDF</title>
</head>
<body>
<form id="form1" runat="server"> <%--<script type="text/javascript" language="javascript">
window.onbeforeunload = closingCode;
function closingCode() {
opener.Enablebutton();
} </script>--%>
<%--<% GetPDF1()%>--%>
<iframe src="Default3.aspx" width="100%" height="100%">
</iframe>
</form>
</body>
</html>
后台代码:
Imports System.Net
Partial Class ShowPDF
Inherits System.Web.UI.Page Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Dim js As String = ""
Dim buttonid As String = ""
If Not Session("ImagePath") Is Nothing AndAlso Not Session("CurrentButtonID") Is Nothing Then
buttonid = Session("CurrentButtonID").ToString()
js = "<script>window.onbeforeunload = closingCode;function closingCode() {opener.Enablebutton('" + buttonid + "');}</script>"
'js = String.Format("<script>window.onbeforeunload = closingCode;function closingCode() {opener.Enablebutton('{0}');}</script>", "Button1")
Response.Write(js) 'write the enable parent button'js
End If End Sub
Public Sub ShowPDFfile()
Dim str As String = ""
If Not Session("ImagePath") Is Nothing Then
str = String.Format("<object data=""\\129.223.229.102\Dis_project\Temp\test.pdf"" type=""application/pdf"" width=""100%"" height=""100%""><p>It appears you don't have a PDF plugin for this browser.No biggie... you can <a href=""em.pdf"">click here todownload the PDF file.</a></p></object>")
End If
Response.Write(str)
End Sub Public Sub GetPDF(ByVal path As String)
'Dim path As String = Server.MapPath(Spath)
Dim client As New WebClient()
Dim buffer As [Byte]() = client.DownloadData(path) If buffer IsNot Nothing Then
Response.ContentType = "application/pdf"
Response.AddHeader("content-length", buffer.Length.ToString())
Response.BinaryWrite(buffer)
Response.Flush()
Response.End()
End If
End Sub
Protected Sub DownloadFile(ByVal fileName As String)
'20110905 Test Export with SSL using IE 7
Dim s_path As String = fileName 'HttpContext.Current.Server.MapPath("~/") +
Dim file As System.IO.FileInfo = New System.IO.FileInfo(s_path) Response.ClearHeaders() HttpContext.Current.Response.ContentType = "application/ms-download"
HttpContext.Current.Response.Charset = "utf-8"
Response.AddHeader("Content-Disposition", "inline; filename=" + HttpUtility.UrlEncode(fileName, System.Text.Encoding.UTF8)) 'inline
HttpContext.Current.Response.AddHeader("Content-Length", file.Length.ToString())
Response.AddHeader("Pragma", "public")
Response.AddHeader("Cache-Control", "max-age=0")
Response.Flush()
HttpContext.Current.Response.WriteFile(file.FullName)
HttpContext.Current.Response.Flush()
'HttpContext.Current.Response.Clear()
HttpContext.Current.Response.End() End Sub
Public Sub GetPDF1()
Dim fileName As String = "\\129.223.229.102\Dis_project\Temp\test1.pdf"
Response.ContentType = "application/pdf"
Response.Clear()
Response.TransmitFile(fileName)
Response.End()
End Sub
End Class
三、框架中的真正的下载(显示页面),显示在框架中
前台代码:
后台代码:
Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load Dim fileName As String = ""
If Not IsPostBack Then
If Not Session("ImagePath") Is Nothing AndAlso Not Session("CurrentButtonID") Is Nothing Then
fileName = Session("ImagePath").ToString()
GetPDF1(fileName)
End If End If End Sub
Public Sub GetPDF1(ByVal fileName As String)
'Dim fileName As String = "\\129.223.229.102\Dis_project\Temp\test1.pdf" If Session("IsPDF") = False Then
Response.ContentType = "application/zip"
Response.AddHeader("Content-Disposition", "attachment; filename=" + HttpUtility.UrlEncode(fileName, System.Text.Encoding.UTF8))
Else
Response.ContentType = "application/pdf"
End If
Response.Clear()
Response.TransmitFile(fileName)
Response.End()
End Sub
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