chrome.runtime.onMessage.addListener未在创建的标签中注册

Question

The following script is injected from my background.js when I create a new tab (new tab loads a site, ie Google.com).

$(function(){
  //this fires when tab is created and script injected
  chrome.runtime.sendMessage({title: window.document.title}, function(){});
  //this fires when clicking on element in created tab
  document.getElementById("Username").addEventListener("click", function(){
    chrome.runtime.sendMessage({someMessageFromLiveSite: 'Clicked in live site!'});
  });

  chrome.runtime.onMessage.addListener(function(msg, _, sendResponse) {
    //this never fires
    chrome.runtime.sendMessage({title: 'This is the created tab responding to a msg'}, function(){});
    //code continues...

As commented above, chrome.runtime.sendMessage seems to work fine, as does a vanilla JS event listener, but the chrome.runtime.onMessage listener does not seem to be added/is not responding from messages sent from other parts of the extension (background or other created pages).

Answer 1

Thanks to Xan's answer here , I realized that I was attempting to broadcast a message to all of my created tabs from background using chrome.runtime.sendMessage , but as explained, this does not broadcast and so chrome.tabs.sendMessage(TAB_ID.... was required in order to get the listener responding on my created content tab.

Whilst the title is technically inaccurate for the problem I was having, it seemed to me the correct symptom, so this answer may still be of help for others.