Fixed so that iframes can be loaded before resizer script.

js/h5p-embed.js

@@ -66,7 +66,6 @@ var H5POldEmbed = H5POldEmbed || (function () {
         loadResizer(h5ps[i].getAttribute('data-h5p'));
       }
       addIframe(h5ps[i]);
-
     }
   }
 

js/h5p-resizer.js

@@ -108,4 +108,17 @@
       });
     }
   }, false);
+
+  // Let h5p iframes know we're ready!
+  var iframes = document.getElementsByTagName('iframe');
+  var ready = {
+    context: 'h5p',
+    action: 'ready'
+  };
+  for (var i = 0; i < iframes.length; i++) {
+    if (iframes[i].src.indexOf('h5p') !== -1) {
+      iframes[i].contentWindow.postMessage(ready, '*');
+    }
+  }
+
 })();

js/h5p.js

@@ -145,6 +145,11 @@ H5P.init = function () {
         // External embed
         var parentIsFriendly = false;
 
+        // Handle that the resizer is loaded after the iframe
+        H5P.communicator.on('ready', function () {
+          H5P.communicator.send('hello');
+        });
+
         // Handle hello message from our parent window
         H5P.communicator.on('hello', function () {
           // Initial setup/handshake is done
@@ -153,7 +158,8 @@ H5P.init = function () {
           // Hide scrollbars for correct size
           document.body.style.overflow = 'hidden';
 
-          H5P.communicator.send('prepareResize');
+          // Content need to be resized to fit the new iframe size
+          H5P.trigger(instance, 'resize');
         });
 
         // When resize has been prepared tell parent window to resize