Show hide custom Woocommerce checkout field based on selected payment method - php

Question

Hi I added custom field in billing form using this code below.
add_filter('woocommerce_billing_fields', 'custom_woocommerce_billing_fields');
function custom_woocommerce_billing_fields($fields)
{
$fields['billing_options'] = array(
'label' => __('If you pay by Invoice. Please add Your Invoice Number Here ', 'woocommerce'), // Add custom field label
'placeholder' => _x('Invoice Number', 'placeholder', 'woocommerce'), // Add custom field placeholder
'required' => false, // if field is required or not
'clear' => false, // add clear or not
'type' => 'text', // add field type
'class' => array('my-css') // add class name
);
return $fields;
}
I have two payment options 1. Cash on delivery 2.Realex Payments HPP – Credit Card.
Is it possible to show custom field only then 1. Cash on delivery selected as payment option.?
Thank you

Answer 1

The following code will hide billing_options custom optional checkout field when the selected payment method is Cash on delivery ("cod"):
// Conditional Show hide checkout fields based on chosen payment methods
add_action( 'wp_footer', 'conditionally_show_hide_billing_custom_field' );
function conditionally_show_hide_billing_custom_field(){
// Only on checkout page
if ( is_checkout() && ! is_wc_endpoint_url() ) :
?>
<script>
jQuery(function($){
var a = 'input[name="payment_method"]',
b = a + ':checked',
c = '#billing_options_field'; // The checkout field <p> container selector
// Function that shows or hide checkout fields
function showHide( selector = '', action = 'show' ){
if( action == 'show' )
$(selector).show( 200, function(){
$(this).addClass("validate-required");
});
else
$(selector).hide( 200, function(){
$(this).removeClass("validate-required");
});
$(selector).removeClass("woocommerce-validated");
$(selector).removeClass("woocommerce-invalid woocommerce-invalid-required-field");
}
// Initialising: Hide if choosen payment method is "cod"
if( $(b).val() !== 'cod' )
showHide( c, 'hide' );
else
showHide( c );
// Live event (When payment method is changed): Show or Hide based on "cod"
$( 'form.checkout' ).on( 'change', a, function() {
if( $(b).val() !== 'cod' )
showHide( c, 'hide' );
else
showHide( c );
});
});
</script>
<?php
endif;
}
Code goes in function.php file of your active child theme (or active theme). tested and works.