Using bootstrap with Webpack Encore in Symfony 4

Question

I would like to use bootstrap with Webpack Encore in Symfony 4.1 but bootstrap does not function. In the template/base.html.twig file in this post, I used some bootstrap classes but it is not taken into account and I don't understand why.

I installed the dependencies I need for bootstrap with yarn:

yarn add bootstrap --dev
yarn add jquery --dev
yarn add popper.js --dev

template/base.html.twig

In this file, I used the asset function in order to take into account the files: build/app.scss and build/app.js

<!DOCTYPE html>
<html>
    <head>
        <meta charset="UTF-8">
        <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">

        <title>{% block title %}Welcome!{% endblock %}</title>
        {% block stylesheets %}
        <link rel="stylesheet" href="{{ asset('build/app.scss') }}">
        {% endblock %}
    </head>
    <body>
        {% block body %}
        <nav class="navbar navbar-expand-lg navbar-light bg-light">
          <a class="navbar-brand" href="#">Navbar</a>
          <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" ar$
            <span class="navbar-toggler-icon"></span>
          </button>
        </nav>

        {% endblock %}
        {% block javascripts %}
            <script src="{{ asset('build/app.js') }}"></script>
        {% endblock %}
    </body>
</html>

In the two following files, I required and imported what I need for bootstrap.

assets/js/app.js

require('../css/app.scss');
var $ = require('jquery');
require('bootstrap');

assets/css/app.scss

@import "~bootstrap/scss/bootstrap";

webpack.config.js

In this file, I used enableSassLoader() in order to activate Sass and autoProvidejQuery() in order to have access to jQuery as a global variable.

var Encore = require('@symfony/webpack-encore');

Encore
    // directory where compiled assets will be stored
    .setOutputPath('public/build/')
    // public path used by the web server to access the output path
    .setPublicPath('/build')
    // only needed for CDN's or sub-directory deploy
    //.setManifestKeyPrefix('build/')

    /*
     * ENTRY CONFIG
     *
     * Add 1 entry for each "page" of your app
     * (including one that's included on every page - e.g. "app")
     *
     * Each entry will result in one JavaScript file (e.g. app.js)
     * and one CSS file (e.g. app.css) if you JavaScript imports CSS.
     */
    .addEntry('app', './assets/js/app.js')

    /*
     * FEATURE CONFIG
     *
     * Enable & configure other features below. For a full
     * list of features, see:
     * https://symfony.com/doc/current/frontend.html#adding-more-features
     */
    .cleanupOutputBeforeBuild()
    .enableBuildNotifications()
    .enableSourceMaps(!Encore.isProduction())
    // enables hashed filenames (e.g. app.abc123.css)
    .enableVersioning(Encore.isProduction())

    // enables Sass/SCSS support
    .enableSassLoader()

    // uncomment if you use TypeScript
    //.enableTypeScriptLoader()

    // uncomment if you're having problems with a jQuery plugin
    .autoProvidejQuery()
;

module.exports = Encore.getWebpackConfig();

The command yarn encore dev builds everything correctly. But, I don't see the bootstrap theme in the screen.

Thanks in advance,

mjones73 · Accepted Answer · 2019-07-21 10:17:47Z

Two Twig helpers from WebpackEncoreBundle can do most of the work for you:

https://symfony.com/doc/current/frontend/encore/simple-example.html#the-import-and-export-statements

{# templates/base.html.twig #}
<!DOCTYPE html>
<html>
    <head>
        <!-- ... -->

        {% block stylesheets %}
            {# 'app' must match the first argument to addEntry() in webpack.config.js #}
            {{ encore_entry_link_tags('app') }}

            <!-- Renders a link tag (if your module requires any CSS)
                 <link rel="stylesheet" href="/build/app.css"> -->
        {% endblock %}
    </head>
    <body>
        <!-- ... -->

        {% block javascripts %}
            {{ encore_entry_script_tags('app') }}

            <!-- Renders app.js & a webpack runtime.js file
                <script src="/build/runtime.js"></script>
                <script src="/build/app.js"></script> -->
        {% endblock %}
    </body>
</html>

stephansav · Accepted Answer · 2018-09-28 14:00:02Z

1

There is an error in the template/base.html.twig file in the head. The result of the global asset/js/app.scss in the public/build directory is a app.css file and not a .scss extension file. It is the result of the build of all the javascript files we can find in the assets/js/ directory.

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">

    <title>{% block title %}Welcome!{% endblock %}</title>
    {% block stylesheets %}
    <link rel="stylesheet" href="{{ asset('build/app.css') }}">
    {% endblock %}
</head>

answered Sep 28, 2018 at 14:00

stephansav

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