[RUBY] Enable jQuery and Bootstrap in Rails 6 (Rails 6)

I wanted to be able to use jQuery and Bootstrap when creating an application with Ruby on Rails, so make a note of the procedure. (Using Webpacker.)

Introduced jQuery, Bootstrap, popper.js (used by Bootstrap) in __1.yarn. __

Execute the following under the application directory.

yarn add jquery bootstrap popper.js

__2. webpack settings __ Add the description of environment.js of app / config / webpack. (This allows you to use $ and Bootstrap Javascript without import or require.)


const { environment } = require('@rails/webpacker');

//from here
const webpack = require('webpack');

  new webpack.ProvidePlugin({
    $: 'jquery',
    jQuery: 'jquery',
    Popper: 'popper.js'
//Added so far.

module.exports = environment

__3. Import Bootstrap JS, CSS __ Import Bootstrap JS with application.js in app / javascript / packs. Create application.scss in app / javascript / stylesheets and import Bootstrap CSS.


import 'bootstrap';
import '../stylesheets/application';


@import '~bootstrap/scss/bootstrap';

__4. Load JS and CSS built by Webpacker from the application side __ Add the following two sentences in the head of app / views / layouts / application.html.erb.


<%= stylesheet_pack_tag 'application', 'data-turbolinks-track': 'reload' %>
<%= javascript_pack_tag 'application', 'data-turbolinks-track': 'reload' %>

That's it.

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