WooComerce, if custom checkbox is checked hide stock status

I have a bit trouble with woocomerce checkbox, i add custom checkbox to product page wit this code:

woocommerce_wp_textarea_input( 
array( 
    'id'          => '_textarea', 
    'label'       => __( 'My Textarea', 'woocommerce' ), 
    'placeholder' => '', 
    'description' => __( 'Enter the custom value here.', 'woocommerce' ) 
));

then save value with this:

    $woocommerce_checkbox = isset( $_POST['_checkbox'] ) ? 'yes' : 'no';
update_post_meta( $post_id, '_checkbox', $woocommerce_checkbox );

Now i tried to write function which make my stock status hiden when this checkbox is checked but i fail , can i ask you guys for some support ?