Trying to get message from background script

Question

I have a problem, when getting message from background script. My mind almost blowed, where is mistake?

manifest

{
    "name":"Some name",
    "version":"0.1",
    "manifest_version": 2,
    "description":"extension for Google Chrome",
    "permissions": ["tabs","http://*/*", "https://*/*", "<all_urls>","notifications","contextMenus","alarms","tabs","bookmarks"],
    "content_scripts":[
    {
        "matches":["<all_urls>"],
        "css":["style.css"],
        "js":["content.js","jquery.js"]
    }
    ],
    "background": {
        "scripts": ["background.js","jquery.js"],
        "persistent": false
    },
    "icons":{
        "16": "images/icon16.png",
        "48": "images/icon48.png",
        "128": "images/icon128.png"
    },
    "browser_action": {
        "default_icon": {
            "19": "images/icon19.png",           
            "38": "images/icon38.png"
        },
        "default_title": "Order Checker",
        "default_popup": "popup.html"
    }
} 

background.js

chrome.tabs.getSelected(null, function(tab) {
    console.log('Loaded!');
    chrome.tabs.sendMessage(tab.id, {
        greeting: "hello"
    });
    console.log('Sended on '+tab.id+'...');
});

content.js

chrome.extension.onMessage.addListener(function(msg, _, request) {
    console.log('Getting request...');
    console.log(msg.greeting);
});

In background page I'm getting in console 2 messages, as expected. But on content page I don't have any messages, so I think it's problem with code in content.js. What I'm doing wrong?

Answer 1

chrome.tabs.getSelected() is deprecated from Chrome 16, use chrome.tabs.query() instead.

Problem in Your Script

chrome.tabs.getSelected() returns reference of current selected tab, which after load of extension is chrome://chrome/extensions/ so your background page is sending message to extensions page where content scripts do not execute

Modify your background script to suit chrome.tabs.query(), you can see messages in console of web pages!

References

• tabs.query