message - Chrome ServiceWorker postMessage -

try postmessage between webapp , corresponding serviceworker. servicewoker registered , working far.
unfortunately noticed strange behavior:
1. navigator.serviceworker.controller null.
2. @ serviceworker side implemented postmessage way:

self.addeventlistener('message', function (evt) { console.log('postmessage received', evt); }); 

unfortunately important field post origin evt.origin=““ , evt.source=null not contain desired values. receive sent evt.data.

do know how post back?

thank much!
andi

one way send response worker controlled app shown in this demo , done following way (i haven't tested yet, demo works , code seems agree specs).

in main page:

function sendmessage(message) {   // wraps message posting/response in promise,   // resolve if response doesn't contain error, , reject   // error if does. if you'd prefer, it's possible call   // controller.postmessage() , set onmessage handler   // independently of promise, convenient wrapper.   return new promise(function(resolve, reject) {     var messagechannel = new messagechannel();     messagechannel.port1.onmessage = function(event) {       if (event.data.error) {         reject(event.data.error);       } else {         resolve(event.data);       }     };      // sends message data transferring     // messagechannel.port2 service worker.     // service worker can use transferred port reply     // via postmessage(), in turn trigger onmessage     // handler on messagechannel.port1.     // see     // https://html.spec.whatwg.org/multipage/workers.html#dom-worker-postmessage     navigator.serviceworker.controller.postmessage(message, [messagechannel.port2]);   }); } 

and in service worker code:

self.addeventlistener('message', function(event) {   event.ports[0].postmessage({'test': 'this response.'}); }); 

you should able use promise returned sendmessage function want response coming service worker.