Chrome Extension - Message Passing from Popup to Content Script

Question

I\'m trying to pass data from a popup to a content script, but I\'m not having any luck. I got it to work the other way around (content -> popup) though. All I want to do is

Answer 1

You need to specify to which tab to send to. Like this:

chrome.tabs.sendMessage(tab.id, {action:'start'}, function(response) {
    console.log('Start action sent');
});

If you don't know which is the tab, you can either send to all (probably a bad idea) or make the tab send info first.

For more information check this page: Message Passing.