refreshing after php serves a download [duplicate] - php

Question

This question already has answers here:
PHP generate file for download then redirect
(11 answers)
Closed 3 years ago.
Page 1 links to page 2. Page 2 serves a download using the following code:
header("Content-disposition: attachment; filename= '$filename'");
header('Content-type: application/pdf');
readfile($file);
header("location: mainpage.php");
The result being the user "stays" on page 1 but is served a download.
How can I set things up, so that users remain on page 1 but it refreshes after the download is served.
I don't know javascript so I am hoping for a purely PHP solution.

Answer 1

In my opinion I wouldn't think you would necessarily need to refresh page1 at all. You should be able to force the download via a link within page1. See below:
Page1.php with a link
Download PDF
Page2.php
$filename = $_GET['pdf'] . '.pdf';
header('Content-type: application/pdf');
header("Content-disposition: attachment; filename= '$filename'");
header("location: $filename");
This will allow the download to start whilst you remain on page1.
Hope this is what you had in mind.

Answer 2

Didn't know of this before, but it's just one of the nice HTTP headers and most of us already know of it from HTML: Refresh.
Just add the following header call:
header('Refresh: 0; url=http://stackoverflow.com/');

Answer 3

You can check what the referer is by $_SERVER['HTTP_REFERER']. So you should be able to put this in you're page1.php:
if($_SERVER['HTTP_REFERER'] == page2.php) {
echo "<meta http-equiv=\"refresh\" content=\"0;url=http://www.yourdomain.com/page1.php\">";
exit();
}
This way, you check if your visitor is coming from page2.php, and if they are, you only parse a meta-tag which refresh the browser. When it is refreshed, it wouldn't refresh again, because the HTTP_REFERER is now page1.php.

Answer 4

No sure if you ever got this answered, but I had the same problem,
here is my solution
The AJAX jquery
$(function(){
$("#itemList").on("click", "a.downloadLink", function(){ //this binds a click event handler on the itemList container that will listen out for any a with class of downloadLink inside it being clicked
var link = $(this);
var item = link.parent();
var forId = item.data("itemid");
var started = new Date(); //the alternative to tracking time elapsed is to just use a simple counter you increment - "poll 5 times" etc. if your doing .5 second intervals, then 5 times = 2.5 seconds for example. Time elapsed may result in less polls, if a poll takes a long time to return, for example. Use whichever approach feels better.
var maxTime = 5000; //5 seconds
function poll(){
$.ajax({
type: "POST",
url: "Watergetstatus.php",
data: {FID: forId}, //this will be turned into a request for page1?forId=1&oldValue=2 - I expect it in this example to return a json-encoded response of {"changed":true|false, "newHtml":"replacementContent on success"}
datatype :'json',
success: function(data){
if (data.changed=true)
{
window.location.reload(true);
}
else {
var elapsed = (new Date())-started;
//window.location.reload(true);
if (elapsed <= maxTime) setTimeout(poll, 500); // Poll again in .5 seconds
//else you can assume the link didn't open / work / the database never changed etc - handle or ignore as needed
}
},
error: function() {
alert("borken"); //the request to the server bombed out; up to you if you want to simply re-queue for another try like above until the expiry time or if you want to show an error or just simply ignore it.
}
});
}
setTimeout(poll, 500); //wait 0.5 seconds before polling
});
});
The HTML had a large list of dynamic links
<div data-itemid="<?php echo $row_Files['FID']; ?> " >
<a class="downloadLink" href="PLC_FILES/WaterCheckOut.php?FID=<?php echo $row_Files['FID']; ?> " target=""><img src="PLCImages/download.fw.png"></a>
</div>
The Poling file watergetstatus.php
mysql_select_db($database_PLC, $PLC);
$query_files = "SELECT * FROM files WHERE FID = '{$_POST['FID']}'";
$files = mysql_query($query_files, $PLC) or die(mysql_error());
$row_files = mysql_fetch_assoc($files);
$totalRows_files = mysql_num_rows($files);
if($row_files['Status'] ==2)
{
$data= array("changed"=>true);
echo json_encode($data);
}
else
{
$data= array("changed"=>false);
echo json_encode($data);
}
THe download file link watercheckout.php
if ( $row_files['Status']==1 ) {
$file_path = $row_files['FileName'];;
$path_parts = pathinfo($file_path);
$file_name = $path_parts['basename'];
$file_ext = $path_parts['extension'];
$content_types = array(
"exe" => "application/octet-stream",
"zip" => "application/zip",
"mp3" => "audio/mpeg",
"mpg" => "video/mpeg",
"avi" => "video/x-msvideo",
);
$ctype = isset($content_types[$file_ext]) ? $content_types[$file_ext] : $ctype_default;
$file = $row_files['FileName'];
$path = "Historical/".date('Y-m-d-His');
$newfile = $path."_".$file;
$today = date('Y-m-d H:i:s');
header('Content-disposition: attachment; filename='.$file);
header("Content-Type: " . $ctype);
header('Content-Length: ' . filesize($file));
header('Content-Transfer-Encoding: binary');
header('Cache-Control: must-revalidate');
header('Pragma: public');
mysql_select_db($database_PLC, $PLC);
mysql_query("UPDATE files SET Status = '2'");
ob_clean();
flush();
readfile($file);
rename($file, $newfile);
I have simplified my code and cut out alot, so it may be missing something, but this was the general frame work that I used and it works for me
Hope this helps someone, as there was not much out there

Answer 5

//----------------- TOP OF DOWNLOAD_PAGE.PHP ----------------------
$download_code = mysql_real_escape_string(urldecode($_GET['code']));
$download = mysql_real_escape_string(urldecode($_GET['download']));
$self = $_SERVER["PHP_SELF"]."?code=$download_code";
//refresh page after download...
echo"
<script type=\"text/javascript\">
function downloadRedirect(){
var redirect_url = \"$self\";
setTimeout(\"DoTheRedirect('\"+redirect_url+\"')\",
parseInt(0.5*1000));
}
function DoTheRedirect(url) { window.location=url; }
</script>
";
...
$filepath = "/var/www/vhosts/YOUR_DOMAIN.com/digital_downloads/";
if (isset($_GET['download'])) {
$file = $_GET['download'];
if (file_exists($filepath.$download) &&
is_readable($filepath.$download) && (preg_match('/\.zip$/',$download) || preg_match('/\.zipx$/',$download) )) {
...
header("Pragma: public");
header("Expires: 0");
header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
header("Cache-Control: public");
header("Content-Description: File Transfer");
header("Content-type: application/octet-stream");
header("Content-Disposition: attachment; filename=\"".$download."\"");
header("Content-Transfer-Encoding: binary");
header("Content-Length: ".filesize($filepath.$download));
ob_end_flush();
readfile($filepath.$download);
}//end if file_exists
}//end if isset
//----------------- BOTTOM HALF OF DOWNLOAD_PAGE.PHP ----------------------
//link generated to download and call JS to refresh page
echo "Click to Download