mythofechelon mythofechelon - 1 month ago 15
Javascript Question

Chrome extension: Get current tab from popup

I'm writing a Chrome extension and, in one part of it, I need to get the current tab's title and URL when a button on the popup page is clicked.

I've worked with Chrome's message passing system before and, after much effort, managed to get it to work, on many occasions. However, I've never had to use them with popup pages and, from what I've read, it's much more difficult to do.

The timeline I've managed to figure out so far is this:


  1. popup.html
    /
    popup.js
    :    Button is clicked

  2. popup.html
    /
    popup.js
    :    Request / message is sent to the content script

  3. contentScript.js
    :           Request / message is received from the popup page

  4. contentScript.js
    :           The title and URL of the current tab are stored in a variable

  5. contentScript.js
    :           The 2 variables are sent as a stringified response

  6. popup.html
    /
    popup.js
    :    The 2 variables are parsed from the response



Usually I'd be able to figure this out but, I've read a few things that have thrown a spanner in the works, such as:


  • chrome.tabs.getSelected
    can only be used in a background page / script. Does this mean that content scripts don't need to be used at all?

  • Messages cannot be sent directly from the content script to the popup page, they have to go via a background page

  • A popup window has to be confirmed as existing before a message can be passed to it (although, I think I know how to do this)



I already found Chrome's message passing system difficult enough but, this has totally confused me. Hence, this post.

Answer

Never mind.

Turns out, you can actually use chrome.tabs.getSelected directly from the popup window. Someone lied. ¬¬