How To Open A PDF File With JSONP

javascript

<script>

$('.pdf').on('click', function() {
    var revision_id = $(this).data('revision');

    $.ajax({
        url:'URL/?revision_id=' +revision_id,
        dataType: 'JSONP',
        jsonpCallback: 'callback',
        jsonp: 'callback',
        success:function(response){
        //do stuff
    },
    error:function(xhr, textStatus, errorThrown){
        alert("Something Happened");//windows 10 style error warning
        }
    });
});

    callback = function(data){
        window.open("your_url/" + data);
    }
</script>

php

  header('content-type: application/json; charset=utf-8');
  header("access-control-allow-origin: *");
  
  $revision_id = (int)$_GET['revision_id'];
  $array = ['revision_id' => $revision_id];
  
  //get the url of pdf here with a variable called $file from a new Application_Model_Modelname passing $array
  
  $file = str_replace('/', '//', $file);
  echo $_GET['callback'] . '('.json_encode($file).')';
  exit();