JavaScript php jquery ajax incremental output jquery ajax incremental response,jquery ajax increment

I have a webpage that calls an AJAX script - ajax.php. I am using JQuery to send the AJAX requests.

The script ajax.php receives some arguments via$_REQUEST, based on that it starts its processing. The processing has multiple steps involved and at the end of the each step I want to send some feedback back to the page - for example:

  • Step 1 completed
  • Step 2 completed
  • ....

Once all the steps are completed - the script ajax.php will output a TXT file which I am outputting via:

header('Content-type: text/plain');
header('Content-Disposition: attachment; filename="output.txt"');

My questions are:

I have a div in the page where I want to show the user that Step 1 completed, Step 2 completed, ... If I use JQuery.ajax(), will the .done function called multiple times? If no, whats the best way to handle it? Can I use ob_implicit_flush in PHP to send 'Step x completed 'messages?

Finally, how will I handle the output of .txt file so that user's browser downloads it? I don't want to save the file on the server and then going into hassle of server disk space, cron jobs of deletes, etc.

I have the option of doing multiple AJAX requests - but again I don't want to do this as this will make my code logic pretty complex and I will have to save a lot of data in $_SESSION to be visible across requests which is again something that I don't want to do.

Answer:1

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