同时执行Javascript和控制器ActionResult

时间:2013-02-07 09:30:56

标签: c# javascript asp.net-mvc

this question I previously asked继续我想知道 - 在我的控制器操作返回文件后,并且已写入响应,是否也可以显示Javscript警报?

请注意,此项目为MVC 1.0

这是ActionReult,我想在文件下载之前执行一些Javascipt:

[AcceptVerbs(HttpVerbs.Post)]
public ActionResult SomeImporter(HttpPostedFileBase attachment, FormCollection formCollection, string submitButton, string fileName)
{
    if (submitButton.Equals("Import"))
    {
        byte[] fileBytes = ImportClaimData(fileName, new CompanyExcelColumnData());
        if (fileBytes != null)
        {
            //This method stores the string in a message queue which is stored in the 
            //session and rendered from within a UserControl. The Javascript alert
            //is then shown subsequently.
            UserMessageUtil.Info("Data imported successfully.", Session);

            //The file downloads but no Javascript alert is shown from the line above.
            return File(
                fileBytes,
                "application/ms-excel",
                string.Format("Import {0}.xls", DateTime.Now.ToString("yyyyMMdd HHmm")));
        }
        return View();
    }
    throw new ArgumentException("Value not valid", "submitButton");
}

HTML Helper用于处理usercontrol内部队列的方法:

public static string UserMessage(this HtmlHelper helper, HttpSessionStateBase session)
{
    MessageQueue queue = UserMessageUtil.GetMessageQueue(session);
    Message message = queue.Next;
    String script = null;

    if (message != null)
    {
        do
        {
            string messageStr = message.Text;
            ....
            script += @"alert('" + messageStr + "');";
        } 
        while ((message = queue.Next) != null);

        return script;
    }

    return null;
}

基本上,文件下载但Javascript警报未显示。 UserMessageUtil.Info()用于项目的其他部分,并按预期工作,在执行时显示警报。

1 个答案:

答案 0 :(得分:0)

如果我理解正确,您希望在文件准备下载后执行一些客户端javascript?

虽然Java EE的技术问题仍然存在,但我有类似的需求。在这个答案http://geekswithblogs.net/GruffCode/archive/2010/10/28/detecting-the-file-download-dialog-in-the-browser.aspx

中看到这个精彩的黑客Detect when browser receives file download

基本上,您希望从您的操作中设置一个cookie,该cookie将随服务器响应一起返回,并对客户端存在该cookie进行一些javascript轮询。一旦服务器响应并向客户端显示文件下载对话框,就会检测到cookie并执行脚本。执行脚本后,您可以销毁cookie。