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PHP Screenshot - button

I have a button which saves screenshots, but unfortunately when you click nothing happens
JavaScript
function take_screenshot() {
html2canvas(document.body, {
onrendered: function(canvas) {
var img = canvas.toDataURL()
$.post("save_screenshot.php", {data: img}, function (file) {
window.location.href = "save_screenshot.php?file="+ file
});
}
});
}
PHP
<?php
if($_GET['file']) {
$file=$_GET['file'];
if (file_exists($file)) {
header('Content-Description: File Transfer');
header('Content-Type: image/png');
header('Content-Disposition: attachment; filename='.basename($file));
header('Content-Transfer-Encoding: binary');
header('Expires: 0');
header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
header('Pragma: public');
header('Content-Length: ' . filesize($file));
ob_clean();
flush();
readfile($file);
unlink($file);
exit;
}
}
if($_POST['data']) {
$data = $_POST['data'];
$file = md5(uniqid()) . '.png';
$uri = substr($data,strpos($data,",")+1);
file_put_contents('./'.$file, base64_decode($uri));
echo $file;
exit();
}
I want to be a screen save as png and me to chose locations. I used the guide on the internet and it seems to me that it should work

You need to split the dataUrl, because it is delimited by ,
function take_screenshot() {
html2canvas(document.body, {
onrendered: function(canvas) {
var img = canvas.toDataURL()
$.post("save_screenshot.php", {data: img.split(',').pop()}, function (file) {
window.location.href = "save_screenshot.php?file="+ file
});
}
});
}

Download Pdf with php, Not working in explorer and safari

I've got a script to download pdf after submitting a form to db works fine on chrome and firefox but when i download my pdf on safari or explorer my pdf is empty and cannot be opened, i have tried many things, right now im using javascript whit window.location and it works on safari and explorer but i would really like my php script to work on all browsers
<?php
ob_start();
if ($_REQUEST["action"] == "download") {
$file = base64_decode($_REQUEST["download"]);
//Insert to download table....
if (isset($_SERVER['HTTP_USER_AGENT'])) {
$agent = $_SERVER['HTTP_USER_AGENT'];
}
if (strlen(strstr($agent, 'Firefox')) > 0) {
$browser = 'firefox';
} else if (strlen(strstr($agent, 'Chrome')) > 0) {
$browser = 'chrome';
} else {
$browser = 'safari';
}
if ($browser == 'safari'){
?>
<script type="text/javascript">
window.location = '<?php echo $file;?>';
</script>
<?php
} else { ?>
<?php
if ($file) {
header('Pragma: public'); // required
header('Expires: 0'); // no cache
header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
header('Cache-Control: private', false);
header('Content-Type: application/octet-stream');
header('Last-Modified: ' . gmdate('D, d M Y H:i:s', filemtime($file)) . ' GMT');
header('Content-Disposition: attachment; filename='.basename($file));
header("Content-Transfer-Encoding: binary");
header('Content-Length: ' . filesize($file)); // provide file size
header('Connection: close');
readfile($file);
exit();
}
}
}

I solved the problem by removing some of the headers, now im only using this
<?php
ob_start();
if ($_REQUEST["action"] == "download") {
$file = base64_decode($_REQUEST["download"]);
if ($file) {
header('Pragma: public'); // required
header('Expires: 0'); // no cache
header("Content-disposition: attachment; filename=".basename($file));
header("Content-type: application/pdf");
readfile($file);
exit();
}
}

you should use the function ob_flush(); if you want to publish this kind of document in explorer

php How to Open Save As Dialog? Script Downloads Automatically

I have a download button that fires htmlcanvas and downloads html and saves it as a png file. I did not configure it as I don't understand javascript. I have played around with several tutorials for downloading files but I cannot get a dialog to open on click, regardless of which tutorial I have tried the image downloads to the download folder of whatever device the page is being viewed on. I think this is an issue with the javascript and not the php?
<script type="text/javascript">
var $loading = $('#loader').hide();
$('#carddownload').on('click', function() {
showimage();
});
$(document)
.ajaxStart(function () {
$loading.show();
})
.ajaxStop(function () {
$loading.hide();
});
function showimage(){
html2canvas([document.getElementById('card')], {
onrendered: function(canvas)
{
var img = canvas.toDataURL()
$.post("save.php", {data: img}, function (file) {
window.location.href ="downloadpng.php?path="+ file});
}
});
}
</script>
<?php
$file = trim($_GET['path']);
// force user to download the image
if (file_exists($file)) {
header('Content-Type: application/download');
header('Content-Description: File Transfer');
header('Content-Type: image/png');
header('Content-Disposition: attachment; filename='.basename($file));
header('Content-Transfer-Encoding: binary');
header('Expires: 0');
header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
header('Pragma: public');
header('Content-Length: ' . filesize($file));
ob_clean();
flush();
readfile($file);
unlink($file);
exit;
}
else {
echo "error not found";
}
?>

downloading .xls file doesn't gives data within file in php

I want data into .xls file...but it doesn't give....
$this->load->view("partial/footer_excel");
$content = ob_end_flush();
$filename = trim($filename);
$filename = str_replace(array(' ', '/', '\\'), '', $title);
$filename .= "_Export.xls";
ob_clean();
ob_start();
header('Content-type: application/vnd.ms-excel; charset=utf-8');
//header('Content-type: application/ms-excel');
header('Content-Disposition: attachment; filename='.$filename);
echo $content;
die();

How to force file download upon jQuery AJAX success?

I'm generating a file dynamically in php like this :
$attachment_url = "http://www.mysite.com/file.jpg";
header('Pragma: public');
header('Expires: 0');
header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
header('Cache-Control: private',false);
header('Content-Type: application/force-download');
header('Content-Disposition: attachment; filename="'.basename( $attachment_url ).'"');
header('Content-Transfer-Encoding: binary');
header('Connection: close');
readfile( $attachment_url );
This data in then passed through jQuery.ajax
I'd like to make it open a file download dialog upon success.
Right now I have this :
success: function(data, textStatus, XMLHttpRequest) {
var win = window.open();
win.document.write(data);
}
This does open a new window and display the raw file data. Instead I would like a download dialog to open.

I'm not sure I have all the necessary information, but you could achieve the goal with 3 files.
download.php
$file = $_GET['file'];
$path = '/var/www/html/';
$attachment_url = $path.$file;
header('Pragma: public');
header('Expires: 0');
header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
header('Cache-Control: private',false);
header('Content-Type: application/force-download');
header('Content-Disposition: attachment; filename="'.basename( $attachment_url ).'"');
header('Content-Transfer-Encoding: binary');
header('Connection: close');
readfile( $attachment_url );
api.php
if (isset($_GET['generate_file'])) {
$str = '';
for($i = 0; $i < 10; $i++) {
$str .= "Number $i\n";
}
$name = 'file.txt';
$path = '/var/www/html/';
file_put_contents($path.$name, $str);
echo $name;
}
ajax.html
<script type="text/javascript">
$.ajax({
url: '/api.php',
data: {
generate_file: true
}
})
.done(function(name) {
$('#results').append('' + name + '');
document.getElementById('link').click(); // $('#link').click() wasn't working for me
$('#link').remove();
});
</script>
<div id="results"></div>