Obtaining "this" tab ID from content script in Chrome extension?

Question

From a content script, is it possible to access that tab's id?

I want to send a message to the background page from the content script that tells my extension to "do something with this tab" using the chrome.tabs.* API.

A tabID is needed, and there is no point in doing a bunch of logic in the background page to hunt for a tabID when my content script can simply tell it the tabID in the message contents.

Answer 1

Tab id is automatically passed inside MessageSender object:

chrome.runtime.onMessage.addListener(function(request, sender, sendResponse) {     console.log("sent from tab.id=", sender.tab.id); }); 

Answer 2

If you want the tabId of yourself (in my case in Content Script) without requiring "tabs" permission, a workaround is to have Content Script send a dummy message to the background script, then have background script respond with sender.tab.id back to the Content Script!

e.g. in content.js:

chrome.runtime.sendMessage({ text: "what is my tab_id?" }, tabId => {    console.log('My tabId is', tabId); }); 

and in background.js:

chrome.runtime.onMessage.addListener(function(msg, sender, sendResponse) {     if (msg.text == "what is my tab_id?") {         sendResponse({tab: sender.tab.id});      } }); 

it's a stupid workaround that worked for me. :)

PS. Oh, if you have tabs permission then you can run this async query very easily:

chrome.tabs.query({active: true, currentWindow: true}, function(tabs){     var myTabId = tabs[0].id;     chrome.tabs.sendMessage(myTabId, {text: "hi"}, function(response) {         alert(response);     }); });