I was using a genesis child theme so had to edit my order_tracking()
function a little. get_template_directory_uri()
gives the URL to the current child theme, combining that with the javascript filename did the trick.
Here’s what got it working:
function order_tracking() {
global $post;
if ( $post->ID == 19851 ) {
wp_enqueue_script('ordertracking', get_template_directory_uri(). "/ordertracking.js", array('jquery') ,'1.0', true );
}
}
add_action( 'wp_enqueue_scripts', 'order_tracking' );