html - Chrome extension sending message from iFrame to event page then to content script -


i have inserted iframe content script. works fine. if want display parent's html content on iframe, have use messaging communicate between iframe , content script, doesn't work. tries send message iframe "event page" "content script". once content script receives message, query html content , reply. doesn't work either. how can make work?

content script:

var iframe = document.createelement('iframe'); iframe.id = "popup"; iframe.src = chrome.runtime.geturl('frame.html'); document.body.appendchild(iframe);  chrome.runtime.onmessage.addlistener(function(msg, sender, sendresponse) {   if (msg.from === 'event' && msg.method == 'ping') {     sendresponse({ data: 'pong' });   } });

event page:

chrome.runtime.onmessage.addlistener(function(msg, sender, sendresponse) {   if (msg.from === 'popup' && msg.method === 'ping') {     chrome.tabs.query({active: true, currentwindow: true}, function(tabs) {        chrome.tabs.sendmessage(tabs[0].id, {         from: 'event',         method:'ping'}, function(response) {           sendresponse(response.data);       });     });   } });

frame.js

// callback function never called, no response returned.  // can see message's sent event page logs. chrome.runtime.sendmessage({from: 'popup', method:'ping'},   function(response) {   $timeout(function(){     $scope.welcomemsg = response;   }, 0); });

i found related question. https://stackoverflow.com/a/20077854/772481

from documentation chrome.runtime.onmessage.addlistener:

this function becomes invalid when event listener returns, unless return true event listener indicate wish send response asynchronously (this keep message channel open other end until sendresponse called).

so have return true indicate sendresponse async.

event page:

chrome.runtime.onmessage.addlistener(function(msg, sender, sendresponse) {   if (msg.from === 'popup' && msg.method === 'ping') {     chrome.tabs.query({active: true, currentwindow: true}, function(tabs) {        chrome.tabs.sendmessage(tabs[0].id, {         from: 'event',         method:'ping'}, function(response) {           sendresponse(response.data);       });     });     return true; // <-- indicate sendresponse async   } });

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