Retrieving HTTP status code from loaded iframe with Javascript

Question

I used the jQuery Form plugin for asynchronous form submission. For forms that contain files, it copies the form to a hidden iframe, submits it, and copies back the iframe's contents. The problem is that I can't figure out how to find what HTTP status code was returned by the server. For example, if the server returns 404, the data from the iframe will be copied as normal and treated as a regular response.

I've tried poking around in the iframe objects looking for some sort of status_code attribute, but haven't been able to find anything like that.

The $.ajax() function can't be used, because it does not support uploading files. The only way to asynchronously upload files that I know of is using the hidden iframe method.

why not run some js on the result iframe? what i mean is, you can set a timeout for the page load ( on the parent ), and the child (iframe) should set a value in the parent. if that value is not set until the timeout, the iframe failed. — Rafael Herscovici
ajax can be used if you read the file into a string first then just submit it like a regular old POST — Hashbrown

Coyod Coyod · Accepted Answer · 2009-12-04T16:09:16

You can't get page headers by JS, but you can distinguish error from success: Try something like this:

<script type="text/javascript">

    var uploadStarted = false;
    function OnUploadStart(){            
        uploadStarted = true;
    }

    function OnUploadComplete(state,message){       

       if(state == 1)
        alert("Success: "+message);     
       else
         if(state == 0 && uploadStarted)
            alert("Error:"+( message ? message : "unknow" ));
    }   

</script>


<iframe id="uploader" name="uploader" onload="OnUploadComplete(0)" style="width:0px;height:0px;border:none;"></iframe>

<form id="sender" action="/upload.php" method="post" target="uploader" enctype="multipart/form-data" onsubmit="OnUploadStart()">
<input type="file" name="files[upload]"/>
<input type="submit" value="Upload"/>
</form>

On server side:

/*
  file: upload.php
*/
<?php 

   // do some stuff with file       

  print '<script type="text/javascript">';
  if(success)
     print 'window.parent.OnUploadComplete(1,"File uploaded!");';
  else
     print 'window.parent.OnUploadComplete(0, "File too large!");';
  print  '</script>';
?>

Retrieving HTTP status code from loaded iframe with Javascript

2 Answers