Manipulate shipping by passing custom field / trigger

I can’t seem to get this to work.

What I’m trying to do is have a checkbox, when a user clicks it, then offer free shipping (and hide all other shipping rates).

My code works when I refresh the page, and it works as needed:

function my_hide_shipping_when_free_is_available( $rates ) {
    
    $free = array();
	
    if ( isset( $_POST['post_data'] ) ) {
        parse_str( $_POST['post_data'], $post_data );
    } else {
        $post_data = $_POST; // fallback for final checkout (non-ajax)
    }
	
	foreach ( $rates as $rate_id => $rate ) {
		if ( 'free_shipping' === $rate->method_id && isset($post_data['customorderfield']) && $post_data['customorderfield'] == 1) {
			$free[ $rate_id ] = $rate;
			break;
		}
	}
	
    if ( isset( $rates['free_shipping:10'] ) ) {
        unset( $rates['free_shipping:10'] );
    }   
	
	return ! empty( $free ) ? $free : $rates;
}
add_filter( 'woocommerce_package_rates', 'my_hide_shipping_when_free_is_available' );

However, what I’m trying to do is have shipping update by triggering update_checkout.
So I have added this js to trigger a cart update it does work and sends the post field

add_action( 'wp_footer', 'woocommerce_sendthis_js' );
function woocommerce_sendthis_js() {
    if (is_checkout()) {
    ?>
    <script type="text/javascript"> 
    jQuery( document ).ready(function( $ ) {
	    
			    jQuery('#mycheckbox').on( 'change', function () {  
			       jQuery('body').trigger('update_checkout', { update_shipping_method: true } );
			    });
    });
    </script>
    <?php
    }
}

I added this snippet of code to my woocommerce fields:

<input id="mycheckbox" class="input-checkbox update_totals_on_change" type="checkbox" name="customorderfield" value="1" />

Again, the shipping updates properly when I refresh the page, but won’t update upon triggering update_checkout, and I’m not sure why. Any ideas?

• This topic was modified 9 years, 7 months ago by dailce.
• This topic was modified 9 years, 7 months ago by dailce.