html page hanging when posting file upload

Question

html page hanging when posting file upload

1.7k Views Asked by twistedpixel At 07 April 2025 at 15:08

I'm trying to add a file upload script in php to a website I'm designing. I've used an online example (I know it's not secure and I plan on making it secure, I just want the basic functionality working first).

Basically what's happening is that when I click the "submit" button, the page stalls and says "loading xyz server.." forever and doesn't ever go to the post action php page! This is very frustrating and I can't see why it won't work!

The code is below and I've tried this on 2 different servers with same results. I'd be very grateful if someone could let me know what I'm possibly doing wrong?

<html> 
<body>
  <form enctype="multipart/form-data" action="do.php" method="post">
    <input type="hidden" name="MAX_FILE_SIZE" value="1000000" />
    Choose a file to upload: <input name="uploaded_file" type="file" />
    <input type="submit" value="Upload" />
  </form> 
</body> 
</html>


<?php
//Сheck that we have a file
if((!empty($_FILES["uploaded_file"])) && ($_FILES['uploaded_file']['error'] == 0)) {
  //Check if the file is JPEG image and it's size is less than 350Kb
  $filename = basename($_FILES['uploaded_file']['name']);
  $ext = substr($filename, strrpos($filename, '.') + 1);
  if (($ext == "jpg") && ($_FILES["uploaded_file"]["type"] == "image/jpeg") && 
    ($_FILES["uploaded_file"]["size"] < 350000)) {
    //Determine the path to which we want to save this file
      $newname = dirname(__FILE__).'/upload/'.$filename;
      //Check if the file with the same name is already exists on the server
      if (!file_exists($newname)) {
        //Attempt to move the uploaded file to it's new place
        if ((move_uploaded_file($_FILES['uploaded_file']['tmp_name'],$newname))) {
           echo "It's done! The file has been saved as: ".$newname;
        } else {
           echo "Error: A problem occurred during file upload!";
        }
      } else {
         echo "Error: File ".$_FILES["uploaded_file"]["name"]." already exists";
      }
  } else {
     echo "Error: Only .jpg images under 350Kb are accepted for upload";
  }
} else {
 echo "Error: No file uploaded";
}
?>

Thanks very much for your time, I have searched for hours to fix this with no luck!

Original Q&A

There are 3 best solutions below

Diodeus - James MacFarlane On 02 March 2011 at 19:22

If you post to an Iframe it won't lock your page. Then watch the Iframe contents to see what the server response is, or better: use Firebug on Firefox and inspect he NET tab to see what's going on with your post request.

Marc B On 02 March 2011 at 19:29

How big of a file are you uploading? Most browsers do not display any kind of upload progress bar, and only recently has PHP supported even bare bones progress reports. For a large file, all you'd see is the "... loading ..." status bar text with no indication that data's actually being uploaded.

As for the rest of the code, here's a few things you need to clean up before putting this into production:

$_FILES['uploaded_file']['error'] == 0

This will evaluate to true if the ['error'] element isn't set. Use === instead, which does forces value and type to be equal, not merely value.

if (($ext == "jpg") && ($_FILES["uploaded_file"]["type"] == "image/jpeg") &&

The filename and filetype values in the $_FILES array are what's supplied by the remote user, and can be easily mainipulated. Best to use a server-side mime-type identifer (getimagesize() for pictures works well) to see what the file really is.

**twistedpixel** · Accepted Answer

Nevermind! It turns out it was something to do with the wireless network at my University. I got home, refreshed the page and it worked fine. I will have to have words with the system administrator about the time I wasted trying to solve a problem made by them.

Thanks for the help anyway guys,

Scott

html page hanging when posting file upload

There are 3 best solutions below

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