change product quantity based on variation selection

gistfile1.txt

add_action('wp_footer', 'method');

function method()
    {   
    global  $post;
    //get_product id
    $product = get_product( $post->ID );
    //if Product is variable add a message
    if(is_product() && $product->is_type( 'variable' ) ){

        ?>
    <script>
        jQuery(document).ready(function() {
            var cort_pric = parseFloat(jQuery('#cart_pric').val()).toFixed(2);
            var sample_pric = parseFloat(jQuery('#simple_pric').val()).toFixed(2);
            if(isNaN(cort_pric) && isNaN(sample_pric)){
                console.log('is not number')
            }
            else{
              
                jQuery( '.variations_form' ).each( function() {
                    jQuery(this).on( 'found_variation', function( event, variation ) {
                       var str = variation.attributes.attribute_pa_shippingtype;
                         var matches = str.match(/(\d+)/);
                        if (matches) {
                            var shiping_number  = matches[0];
                            var get_pric = jQuery('#cart_pric').val();
                           var cart_prc = parseFloat(get_pric).toFixed(2);
                            jQuery('[name="quantity"]').val(shiping_number);
                        }
                        else{
                            jQuery('.per_pc').remove();
                            jQuery('[name="quantity"]').val('1');
                        }
                    });
                });
            }
        });
    </script>
    <?php
    }
    
}