Ajaxifying Comment - Load Javascript script & its Javascript params

gistfile1.php

/**
 * Load the script
 * Most of the time, the script will be used at is_singular(). Make this pluggable tho, just in case the single page is displayed as overlay on other page
 */
function simple_ajax_comment_script(){
	if( apply_filters( 'simple_ajax_comment_is_used', is_singular() ) ){
		/**
		 * Load the js script
		 */
		wp_enqueue_script( 'simple-ajax-comment-script', plugin_dir_url( __FILE__ ) . 'js/simple-ajax-comment.js' , array( 'jquery', 'jquery-form' ), '1.0.0' );

		/**
		 * Error messages can be obtained from /wp-includes/comment.php. Look for a line which uses wp_die()
		 * Its error code can be used to identify proper error response. 
		 */
		wp_localize_script( 'simple-ajax-comment-script', 'simple_ajax_comment_params', apply_filters( 'simple_ajax_comment_params', array(
			'error_messages' => array(
				'409' => __( 'Duplicate comment detected; it looks as though you have already said that!' ),
				'429' => __( 'You are posting comments too quickly. Slow down.' )
			)
		)));
	}
}
add_action( 'wp_enqueue_scripts', 'simple_ajax_comment_script' );