First you will need to:
Enqueu main jquery-ui datepicker script
Change your custom script starting it with jQuery(function($){ instead of $(function(){ …
So to enable datepicker for your custom text field your code will be:
// Register main datepicker jQuery plugin script
add_action( 'wp_enqueue_scripts', 'enabling_date_picker' );
function enabling_date_picker() {
// Only on front-end and checkout page
if( is_admin() || ! is_checkout() ) return;
// Load the datepicker jQuery-ui plugin script
wp_enqueue_script( 'jquery-ui-datepicker' );
}
// Call datepicker functionality in your custom text field
add_action('woocommerce_after_order_notes', 'my_custom_checkout_field', 10, 1);
function my_custom_checkout_field( $checkout ) {
date_default_timezone_set('America/Los_Angeles');
$mydateoptions = array('' => __('Select PickupDate', 'woocommerce' ));
echo '<div id="my_custom_checkout_field">
<h3>'.__('Delivery Info').'</h3>';
// YOUR SCRIPT HERE BELOW
echo '
<script>
jQuery(function($){
$("#datepicker").datepicker();
});
</script>';
woocommerce_form_field( 'order_pickup_date', array(
'type' => 'text',
'class' => array('my-field-class form-row-wide'),
'id' => 'datepicker',
'required' => true,
'label' => __('Delivery Date'),
'placeholder' => __('Select Date'),
'options' => $mydateoptions
),$checkout->get_value( 'order_pickup_date' ));
echo '</div>';
}
Code goes in function.php file of your active child theme (or theme) or also in any plugin file.