[RUBY] [Webpacker] Summary of how to install Bootstrap and jQuery in Rails 6.0

How to install Bootstrap and jQuery in Rails

--The old method using Gem --Method using Webpacker from 6.0

There are two, but this time we will adopt the * latter *.

Reference target person

--Those who want to use bootstrap and jQuery with Rails6.0


$ rails -v
$ ruby -v
ruby 2.7.0p0 (2019-12-25 revision 647ee6f091) [x86_64-darwin19]

Manage packages with Webpaker

$ yarn install jquery popper.js bootstrap

In Rails, Bootstrap depends on packages called jQuery and popper.js, so install them together. Also, packages are installed under the ** node_modules directory **.

Introducing bootstrap

Webpack settings


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

const webpack = require('webpack')
  new webpack.ProvidePlugin({
    $: 'jquery/src/jquery',
    jQuery: 'jquery/src/jquery',
    Popper: ['popper.js', 'default']

module.exports = environment

It is set to load jQuery and popper in advance. By doing this, you don't have to bother to read with ** require or @import **.

Load javascript made by bootstrap



Load bootstrap CSS


 *= require bootstrap/dist/css/bootstrap.min.css
 *= require_tree .
 *= require_self

Bootstrap should be loaded before ** self-written css (* = require_self) **.

Introduction of jQuery

load jQuery




Load your own JavaScript file


  <%= javascript_pack_tag 'users/new' %>

Make the js file available by calling the users / new.js file under the javascript / packs directory.

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