检测iframe何时有响应？

Question

我创建了一个AJAX样式文件下载（使用iframe）并且一切正常...但是，我需要检测iframe何时收到响应...请参阅下文：

使用Javascript：

function download() {
  var ifrm = $('#iframedownload')[0];
  ifrm.src = '/downloadfile.aspx?fileid=whatever';
  ifrm.onreadystatechange = function () { // Checking
    if (this.readyState == 'complete')
      alert("I would really like this piece to work!");
  };
}

C＃for downloadfile.aspx：

Response.AddHeader("content-disposition", "attachment; filename=\"" + zipFileName + "\"");
Response.AddHeader("Content-Length", respBytes.Length.ToString());
Response.ContentType = "application/octet-stream";
Response.BinaryWrite(respBytes); 
Response.End();

感谢。

Answer 1

Handle the <iframe>'s onload and readystatechanged events