javascript - XMLHttpRequest.upload.addEventListener ("progress"... 不工作

Question

我尝试通过调用 XMLHttpRequest.upload.addEventListener("progress", progressHandler, false); 来填充上传栏。显然我的函数 progressHandler 根本没有被调用。我不知道为什么。

其他一切正常，例如completeHandler 的调用，在文件完全上传后。我的测试文件的上传大约需要。 15 秒，所以我希望调用 progressHandler。

也许有人可以帮助我？

    var formdata = new FormData();
    formdata.append("uploadfilename", file);
    formdata.append("inte", ticketid);
    formdata.append("username", userName);
    formdata.append("custname", custName);
    formdata.append("userlastname", userLastName);
    formdata.append("par", par);
    formdata.append("mod", mod);

    var ajax = new XMLHttpRequest();
    ajax.upload.addEventListener("progress", progressHandler, false); 
    ajax.addEventListener("load", completeHandler, false);
    ajax.addEventListener("error", errorHandler, false);
    ajax.addEventListener("abort", abortHandler, false);
    ajax.open("POST", "mod/intern/uploader_upload_done.php", false);
    ajax.send(formdata);

    var response = JSON.parse(ajax.responseText);
    // parsing response
    ....


    function progressHandler(event)
    {
       var percent = 100 *(event.loaded / event.total);
       _("fortschritt").value = Math.round(percent);
       _("fortschritt_txt").innerHTML = Math.round(percent)+"% done...";
    }


    function completeHandler(event)
    { 
      _("fortschritt_txt").innerHTML = event.target.responseText;
      _("fortschritt").value = 100;
     _("ticketid").value = '';
   }


   function errorHandler(event)
   { 
      _("fortschritt_txt").innerHTML = "Upload failed";
   } 


    function abortHandler(event)
    {
      _("fortschritt_txt").innerHTML = "Upload cancelled";
    }

Answer 1

您正在同步上传文件，请尝试将 open() 调用更改为

 ajax.open("POST", "mod/intern/uploader_upload_done.php", true);