Shipping and Billing full name Javascript and php validation

fullname.js

// Shipping full name validation
jQuery( document.body ).on( 'cartimize_shipping_full_name_validation', function(event, defaultResult, fieldValue){
    		//Add your custom code here. Return true or false else it will use default validation
            //Example: Check fieldValue empty or not
            if(fieldValue.length === 0 ){
                return false;
            }else{
                return true;
            }

    	});
      
// Billing full name validation
jQuery( document.body ).on( 'cartimize_billing_full_name_validation', function(event, defaultResult, fieldValue){
    		//Add your custom code here. Return true or false else it will use default validation
            //Example: Check fieldValue empty or not
            if(fieldValue.length === 0 ){
                return false;
            }else{
                return true;
            }
    	});

fullname.php

<?php

add_filter('cartimize_front_end_parsley_errors', 'cartimize_custom_cartimize_front_end_parsley_errors', 10, 1);

function cartimize_custom_cartimize_front_end_parsley_errors( $value ){
	$value['parsley_errors']['shipping_fullname']= esc_html( 'This value is required.');
	$value['parsley_errors']['billing_fullname']= esc_html( 'This value is required.');
	return $value;
}