Show RSVP link if 'rsvp' query string is present

index.html

@@ -23,7 +23,7 @@
     </a>
 
     <aside class="menu mobile-menu is-hidden is-size-4" style="background-color: whitesmoke; position: fixed; width: 100%; height: 100%; top: 0; left: 0; z-index: 100;">
-      <a class="close-mobile-menu box" style="position: absolute; width: 40px; height: 40px; top: 1rem; right: 1rem;">
+      <a class="close-mobile-menu box" style="position: relative; width: 40px; height: 40px; margin-top: 1rem; margin-left: 1rem;">
         <svg style="position: absolute; top: 8px; left: 8px; width: 25px; height: 25px;" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 64 64"><path fill="#1D1D1B" d="M28.941 31.786L.613 60.114a2.014 2.014 0 1 0 2.848 2.849l28.541-28.541 28.541 28.541c.394.394.909.59 1.424.59a2.014 2.014 0 0 0 1.424-3.439L35.064 31.786 63.41 3.438A2.014 2.014 0 1 0 60.562.589L32.003 29.15 3.441.59A2.015 2.015 0 0 0 .593 3.439l28.348 28.347z"/></svg>
       </a>
       <ul class="menu-list">
@@ -32,6 +32,7 @@
         <li><a href="#things-to-do">Things to do in Rochester</a></li>
         <li><a href="#registry">Registry</a></li>
         <li><a href="#faq">FAQ</a></li>
+        <li><a href="https://rsvp.as/" target="_blank" class="rsvp is-hidden">RSVP</a></li>
       </ul>
     </aside>
 
@@ -51,6 +52,7 @@
               <li><a href="#things-to-do">Things to do in Rochester</a></li>
               <li><a href="#registry">Registry</a></li>
               <li><a href="#faq">FAQ</a></li>
+              <li><a href="https://rsvp.as/" target="_blank" class="rsvp is-hidden">RSVP</a></li>
             </ul>
           </div>
         </nav>
@@ -293,6 +295,25 @@
          }
        }
      });
+
+
+      function getParameterByName(name, url) {
+       if (!url) url = window.location.href;
+       name = name.replace(/[\[\]]/g, "\\$&");
+       var regex = new RegExp("[?&]" + name + "(=([^&#]*)|&|#|$)"),
+                   results = regex.exec(url);
+       if (!results) return null;
+       if (!results[2]) return '';
+       return decodeURIComponent(results[2].replace(/\+/g, " "));
+     }
+     var rsvpCode = getParameterByName('rsvp');
+     if (rsvpCode) {
+       var rsvp = document.querySelectorAll('.rsvp')
+       for (var i = 0; i < rsvp.length; i += 1) {
+         rsvp[i].href = 'https://rsvp.as/' + encodeURIComponent(rsvpCode);
+         rsvp[i].classList.remove('is-hidden');
+       }
+     }
     </script>
   </body>
 </html>