Rails: Bootstrap dropdown menu not working

Question

I am quite new to Rails and have been following the tutorial by Michael Hartl. Everything has been going along really well until I got to the drop down menu, which was wasn\'t

Answer 1

What I was able to determine was the issue was 2 rouge js files that I had placed in the assets/javascript directory. Namely, bootstrap.js and bootstrap.min.js. Once I removed these files the dropdown was working again.

Answer 2

Using a later version of rails (5.2.3) I found that the instructions given in the book didn't work. The console warned me that jQuery needed to be installed, and by going to https://github.com/rails/jquery-rails I was able to find the instructions to get it up-and-running.

Add to the Gemfile:

gem 'jquery-rails'

Add to application.js

//= require jquery
//= require bootstrap

So that the whole Gemfile is

//= require rails-ujs
//= require activestorage
//= require jquery
//= require bootstrap
//= require turbolinks
//= require_tree .

Answer 3

you can try to call it via javascript adding :

<script>
   $('.dropdown-toggle').dropdown()
</script>

at the botton of your _header file.

hope helps!

Answer 4

The problem is bootstrap's javascript. Sometimes is loaded two times.

This works to me:

application.js:

//= require jquery
//= require jquery_ujs
//= require turbolinks
//= require bootstrap

application.scss: Don't use //= require in scss files

@import "*";
@import "bootstrap";
@import "font-awesome";

Then:

rake assets:clean
rake assets:precompile 

OR

Put bootstrap.js in assets/javascripts folder and put //= require_tree . line

Answer 5

I changed the order of directives in app/assets/javascripts/application.js to:
//= require jquery //= require jquery_ujs //= require bootstrap //= require_tree .

Worked like a charm :)

Answer 6

In modern version of the book (rails 6+) this is what i've done to make it work:

In app/javascript/packs/application.js change the order of

require("jquery");
import "bootstrap";

to be before turbolinks - so final implementation of application.js looks like:

require("jquery");
import "bootstrap";
require("@rails/ujs").start();
require("turbolinks").start();
require("@rails/activestorage").start();
require("channels");

Book shows to add jquery & bootstrap at the end after turbolinks - what in my opinion causes the problem. Thanks!