on radio button click
HTML
<input type="radio" name="wpc_delivery_mode" class='wprr_selected' value="pick_up">click me
<input type="radio" name="wpc_delivery_mode" value="send_to_address" required="">click me too
JavaScript
$('.wprr_selected').change(function(e) {
e.preventDefault();
//alert($(this).val());
alert('test');
});