Trouble with sendMessage from popup.js to content.js

Dan Savage

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Apr 28, 2015, 10:10:14 PM4/28/15

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I'm trying to make a popup interface for a chrome extension. I can't seem to send a message from the popup.html/popup.js to the content.js script. Here's what I have so far. When I click on the extension icon I get a button that says clickme. I click it and nothing happens, no errors in the chrome javascript console, and no message to content.js. I've been reading up on this for 2 days and there are examples of this working, but I can't get my example to work.

Manifest

{
"content_security_policy": "script-src 'self' 'unsafe-eval'; object-src 'self'",
  "manifest_version": 2,
  "name": "extensiontest",
  "version": "0.2",
  "content_scripts": [
  {
    "matches": [
      "<all_urls>"
    ],
    "js": ["content.js"]
  }
],
"browser_action": {
  "default_icon": "Beaker.png",
    "default_popup":"popup.html"
},
"background": {
  "scripts": ["background.js"]
},
"permissions": [
    "tabs"
  ]
}

popup.html

<html>
<head></head>
<script src="popup.js"></script>
<body>
<input id="button1" type=button value=clickme>
</body></html>

popup.js

function popup(){
    alert(1);
      chrome.tabs.query({active: true, currentWindow: true}, function(tabs) {
    var activeTab = tabs[0];
    chrome.tabs.sendMessage(activeTab.id, {"message": "start"});
  });

button1=document.getElementById("button1");
button1.addEventListener('click', popup)
}

content.js

   chrome.runtime.onMessage.addListener(
      function(request, sender, sendResponse) {
        if( request.message === "start" ) {
         start();
             }
      }
    );

    function start(){
        alert("started");
    }

Onno van der Zee

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Apr 29, 2015, 5:55:04 PM4/29/15

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You did not set up a connection and a listener.

in popup.js you need to connect:

var port = chrome.tabs.connect(...

then post

port.postMessage(...

in content.js you need to set up a onconnect listener:

chrome.runtime.onConnect.addListener(function (...

port.onMessage.addListener(...

succes.

Op woensdag 29 april 2015 04:10:14 UTC+2 schreef Dan Savage:

prabakaran....@borngroup.com

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Oct 29, 2018, 3:17:52 PM10/29/18

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Could you give me an example program?

Darren Govoni

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Oct 29, 2018, 3:55:09 PM10/29/18

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You can just use window.postMessage({field:value},"*");

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Prabakaran Palaniyandi

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Oct 29, 2018, 5:31:55 PM10/29/18

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Thank you!

Prabakaran P

Front End Developer, BORN

India Direct Dial: +91 9942352417

2^nd Floor, Hardy Tower, Ramanujan IT SEZ,

TRIL Infopark Limited, Taramani, Chennai – 600 113

www.borngroup.com

puja...@gmail.com

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