WordPress - AJAX call returns 0 - wordpress

Question

I am developing a WordPress plugin, and everything works fine. Only problem is, I have an ajax call in jQuery to some code in a php file. It works but it is just a few php commands in a file. That is bad practice in WP, everything should be in a function and attached using a hook.
this is the code in output.php
if(isset($_POST['test']) && $_POST['test'] == 'ON'){
if(isset($_POST['id'])){
$productId = intval(preg_replace('/[^0-9]+/', "", $_POST['id']));
if ($productId > 1){
$results = get_option( 'test_options' );
$result = $results[$productId];
unset($results);
echo json_encode($result);
die();
}
}
}
this is the AJAX-call in jQuery script
$.ajax({
type: "POST",
url: "output.php",
data: {
'test' : "ON",
'id' : productId
},
success: function(results) {
result = $.parseJSON(results);
createArray(result);
}
});
This works fine. But when I change the code in output.php into a function and use action hook like this:
function getInfo(){
$test = $_POST['test']);
$id = $_POST['id']);
if(isset($test) && ($test == "ON")){
$result = '';
if(isset($id)){
if ($id > 1){
$results = get_option( 'test_options' );
$result = $results[$id];
echo json_encode($result);
die();
}
}
}
}
add_action('wp_ajax_getInfo','getInfo');
add_action('wp_ajax_nopriv_getInfo','getInfo');
and change the jQuery script to:
$.ajax({
url: my_ajax_script.ajaxurl,
type: 'POST',
data: {
action : 'getInfo',
test : "ON",
id : productId
},
cache: false,
success: function(results) {
result = $.parseJSON(results);
console.log(result);
alert("succes");
createArray(result);
}
});
it doesn't work. What am I missing? I have checked a lot of questions on stackoverflow describing sort of the same problem, checked the solutions but can't find where I go wrong.

Answer 1

It finally started working once I added the code of the output.php file to the file that held the wp_localize_script() command for the AJAX url.
For frontend use of AJAX calls you need this command to make AJAX available. In admin area AJAX is available by default.