Accessing Current Tab DOM Object from "popup.html"?

Question

I'm developing an extension for Google Chrome browser. I could not figure out how to access the current tab DOM object from the "popup.html" page. any suggestions?

Answer 1

By default, within popup.js/popup.html, the "document" object refers to the extension's popup window's document only. To get the DOM for a specific tab (for instance the currently active tab), you would need to use content scripts communications. For example we need to send a request from the extension to your content script via popup, so in the popup.html you do something like this:

chrome.tabs.getSelected(null, function(tab) {   // Send a request to the content script.   chrome.tabs.sendRequest(tab.id, {action: "getDOM"}, function(response) {     console.log(response.dom);   }); }); 

Now in the content script, we need to listen for those events coming from the extension, so in some file we named dom.js

chrome.extension.onRequest.addListener(function(request, sender, sendResponse) {  if (request.action == "getDOM")    sendResponse({dom: "The dom that you want to get"});  else    sendResponse({}); // Send nothing.. }); 

Now remember to setup your manifest to include the content script and tab permission.

Answer 2

This is the latest fix:

popup.js

chrome.tabs.query({active: true, currentWindow: true}, function(tabs) {   chrome.tabs.sendMessage(tabs[0].id, {greeting: "hello"}, function(response) {       console.log(response.farewell);   }); }); 

(Note: the above console.log(response.farewell) is for popup.html, not your current tab)

contentscript.js

chrome.runtime.onMessage.addListener(   function(request, sender, sendResponse) {     if (request.greeting == "hello")       sendResponse({farewell: "goodbye"});   }); 

Source: https://developer.chrome.com/extensions/messaging