Ajax View Counter

functions.js

$(window).load(function() { 
  $.ajax({
     url : kontakin.ajax_url,
     type : 'post',
     data : {
       action : 'add_kontakin_view',
       post_id : postID
     },
     success : function( response ) {
       window.location.replace(linkdirection);
     }
   });
 });

theme-functions.php

function add_kontakin_view() {
	$view = get_post_meta( $_POST['post_id'], 'kontakin_view', true );
	$view++;
	if ( defined( 'DOING_AJAX' ) && DOING_AJAX ) {
		update_post_meta( $_POST['post_id'], 'kontakin_view', $view );
		echo $view;
	}
	die();
}
add_action( 'wp_ajax_nopriv_add_kontakin_view', 'add_kontakin_view' );
add_action( 'wp_ajax_add_kontakin_view', 'add_kontakin_view' );

theme-style.php

wp_enqueue_script( 'kontakin-functions', get_template_directory_uri() .'/js/functions.js', array('jquery'), null, true );

wp_localize_script( 'kontakin-functions', 'kontakin', array(
  'ajax_url' => admin_url( 'admin-ajax.php' ),
  'pixel' => get_field('kontakin_facebook_pixel_id','option')
));