I have a button. By clicking the button, I want to export some data shown on the webpage to a file for downloading.
I am doing this in this way: I have a export.php. I send the data as the parameter to PHP file (another parameter is filename), and PHP server create a file and write the data, and then send file. Code is like:
$filename = $_GET['filename'] . '.csv';
$export = $_GET['export'];
$writer = fopen($filename, 'w') or die('cannot create');
fwrite($writer, $export . "\n");
fclose($writer);
header('Content-Type: text/csv');
header('Content-Disposition: attachment; filename='.basename($filename));
readfile($filename);
unlink($filename);
exit();
For cases that the data are short, it works fine. But if the data are long, since the data are passed as part of the URL, I will get “Request-URI Too Large” error.
Is there any alternative way to do that? Is it possible to directly write data using JavaScript?
Instead of passing the data as a query string, use javascript to create an iframe and build a form which then posts to the php file.
IF your using jquery there’s a good tutorial http://tutorialzine.com/2011/05/generating-files-javascript-php/