boilerplate function

app.js

@@ -118,7 +118,27 @@
       });
     });
 
+    $('form.js-keysign').addEventListener('submit', function (ev) {
+      ev.preventDefault();
+      ev.stopPropagation();
+      $('.js-pem-loading').hidden = false;
+      $('.js-toc-jws').hidden = true;
+      $('.js-toc-jwt').hidden = true;
+      $$('input').map(function ($el) { $el.disabled = true; });
+      $$('button').map(function ($el) { $el.disabled = true; });
+
+      // function here
+      // keys.generate()
+      // jws = jwk.sign(payload)
+      // jwt = jws.protected + '.' + jws.payload + '.' + jws.signature
+      // promise call back
+      $('.js-pem-loading').hidden = true;
+      $$('input').map(function ($el) { $el.disabled = false; });
+      $$('button').map(function ($el) { $el.disabled = false; });
+    });
+
     $('.js-generate').hidden = false;
+    $('.js-sign').hidden = false;
   }
 
   window.addEventListener('load', run);