Hi Mihai,
Sorry to hear that you’re having an issue with the JavaScript. Which browser are you using? Are you navigating to localhost:4000 before you try running the code in the JavaScript console?
The code from the book works for me in Chrome and Safari with Phoenix 1.3.x and 1.4 projects, so I’m not able to reproduce the problem locally. If you can give me any more information, I’ll try again to reproduce the issue.
Just a little hack in case You cannot use require in the browser… You can add in app.js
window.phoenix = require("phoenix");
This will give You access to phoenix in the console through window object, like this
> var socket = new window.phoenix.Socket("/socket", {})
Hi,
I’m using Chrome Version 72.0.3626.119 (Official Build) (64-bit) on Ubuntu 18.04 and Firefox Version 65.0.2 (64-bit) with Phoenix 1.4
Because other users have the same issue (see errata #82937 reported in: P1.0 on 21-Mar-18), my guess was that you have a browser extension installed.
Thanks for answer,
Mihai
Thanks Le Gorille,
The hack seems to work perfect.
Now I can continue playing with the nice example project from the book 
The problem with require is… it is not meant to run in the browser, but on node.js.
Browser support is probably limited… but You can use require.js.
I think that the hack from your previous reply is just enough for finishing the project from the book.
I enjoyed following the example from this tutorial, so it would have been a pity not to get to the end.
Thanks again for help
So glad that @kokolegorille provided the solution, and that you’re able to keep working through the book!
Chrome, Mac OS X, recent Phoenix and Elixir version on Nov 20, 2019.
I have the same issue, and not familiar to Phoenix yet. I arrived at this page by googling “var phoenix = require(“phoenix”)”.
Hi jejuro,
I used kokolegorille’s trick: I added at the end of the /assets/app.js the line window.phoenix = require("phoenix");.
Then, in the browser’s console I called the socket like this:
var socket = new window.phoenix.Socket("/socket", {})
It worked for me and I finished the exercise from the book