通过客户端在C＃/ ASP.NET页面的JavaScript调用启动文件下载？ [英] Start file download by client from Javascript call in C#/ASP.NET page?

问题描述

我需要从javascript code启动从ASP.NET网页文件下载。

I need to initiate file download from ASP.NET page from javascript code.

什么是我最好的选择？是否有可能调用web服务这样做，或以某种方式调用C＃页的平常事件处理程序？

What would be my best option? Is it possible to call a webservice to do so, or somehow call usual event handler of C# page?

请注意，我会检索大量数据，许多兆字节。

Note that I will retrieve a large amount of data, many megabytes.

推荐答案

您可以使用一个隐藏的IFRAME元素并启动文件下载请求，这给剂量的感觉了AJAX文件下载。

You can use a hidden IFRAME element and initiate a file download request, which dose give the feeling for a AJAX file download.

当文件被下载，你可以做其他的活动窗体上的客户端。

While the file is being downloaded you can do other activity in your form on client side.

是的，你可以调用web服务或ASPX页面或HTTP处理程序，以及在这个网址

Yes you can call a webservice or aspx page or http handler as well in this URL

function dowloadFileJS()  {
      // Create an IFRAME.
      var iframe = document.createElement("iframe");

      // Point the IFRAME to GenerateFile
      iframe.src = "GenerateFile.aspx?yourQueryString=myQueryString";

      // This makes the IFRAME invisible to the user.
      iframe.style.display = "none";

      // Add the IFRAME to the page.  This will trigger a request to GenerateFile now.
      document.body.appendChild(iframe); 
    }

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