Symfony 4 - Webpack Encore bootstrap css 不在输出中

Symfony 4 - Webpack Encore bootstrap css not in output

我正在尝试将 Webpack Encore 引入我的 Symfony 4 应用程序以管理 JS 和 CSS 资产。

我安装了 yarnnodejs

然后 composer require encore 然后 yarn install.

我在 assets/js/ 中有 app.js 文件。

/*
 * Welcome to your app's main JavaScript file!
 *
 * We recommend including the built version of this JavaScript file
 * (and its CSS file) in your base layout (base.html.twig).
 */

// any CSS you require will output into a single css file (app.css in this case)
require('bootstrap');
require('../css/app.css');

// Need jQuery? Install it with "yarn add jquery", then uncomment to require it.
const $ = require('jquery');

console.log('Hello Webpack Encore! Edit me in assets/js/app.js');

已安装 bootstrap 和其他与 yarn 的依赖项:

{
    "devDependencies": {
        "@symfony/webpack-encore": "^0.22.0",
        "bootstrap": "^4.3.1",
        "jquery": "^3.3.1",
        "popper.js": "^1.14.7",
        "webpack-notifier": "^1.6.0"
    },
    "license": "UNLICENSED",
    "private": true,
    "scripts": {
        "dev-server": "encore dev-server",
        "dev": "encore dev",
        "watch": "encore dev --watch",
        "build": "encore production --progress"
    }
}

然后运行yarn encore dev --watch

问题

我的 public/build/app.css.

中没有任何 bootstrap css

webpack.config.js 中我还需要 require('bootstrap'); 吗?

如果您转到 node_modules 目录,查找 bootstrap 并打开它的 package.json 您会找到条目:

"main": "dist/js/bootstrap",

当你这样做时:

require("bootstrap");

在您的文件中,您需要图书馆 package.jsonmain 部分中指定的文件。
但是,您可以通过指定其(相对)路径来从库中获取任何文件:

require("bootstrap/dist/css/bootstrap.css");

现在你可以运行:

yarn encore dev

和 Bootstrap CSS 应该在你的 app.css.

编辑(2019-03-05):
这是 relevant block code of the screencast 7. Require CSS!?, part of the SymfonyCasts Course Webpack Encore: A Party for your Assets Tutorial.

更新 (2019-11-25):
此答案解释了如何使用 Node.js.[=29 提供的 require 函数绑定(导入)与 yarn(或 npm)一起安装的 CSS 库=]

ECMAScript 2015(也称为 ES6)引入了新功能 import from WhiteRabbit.

中解释了它的用法

除了这两个选项之外,还有第三种方法可以导入 Bootstrap,即直接在您自己的 CSS 文件中使用 @import

@import 'bootstrap';

这仅在使用 WebpackYarn(或 NPM)时适用。 Webpack Encore 能够解析路径并导入相应的 CSS 文件。

基本上是 cezar 说的,但我把它放在一个答案中,因为评论会使它变得不可读:

import 'bootstrap';  // js-file
import 'bootstrap/dist/css/bootstrap.css'; // css file

不是 100% 确定,但我认为您还需要手动导入 Popper 和 Jquery:

import Popper from 'popper.js';
import $ from 'jquery';

根据文档bootstrap in webpack encore

在webpack.config.js你可以有

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')

    .splitEntryChunks()
    // will require an extra script tag for runtime.js
    // but, you probably want this, unless you're building a single-page app
    .enableSingleRuntimeChunk()

    /*
     * 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()

    // uncomment if you use API Platform Admin (composer req api-admin)
    //.enableReactPreset()
    //.addEntry('admin', './assets/js/admin.js')
;

module.exports = Encore.getWebpackConfig();

然后使用以下命令安装 jquery、popper.js、bootstrap、font-awesome(如果您使用 npm 并且需要 font-awesome):

npm install jquery --save-dev
npm install popper.js --save-dev
npm install bootstrap@4 --save-dev
npm install font-awesome --save-dev

在app.js中,你可以有:

/*
 * Welcome to your app's main JavaScript file!
 *
 * We recommend including the built version of this JavaScript file
 * (and its CSS file) in your base layout (base.html.twig).
 */

// any CSS you require will output into a single css file (app.css in this case)
require('../css/app.css');

// Need jQuery? Install it with "yarn add jquery", then uncomment to require it.
const $ = require('jquery');
import 'popper.js';
import 'bootstrap';
import 'bootstrap/dist/css/bootstrap.css';
import 'font-awesome/css/font-awesome.css';

$(document).ready(function(){
    // Put your jquery code here.
});

在您的模板中,您可以:

<!DOCTYPE html>
<html>
    <head>
        <meta charset="UTF-8">
        <title>title</title>
        {{ encore_entry_link_tags('app') }}  
    </head>
    <body>
         <div id="content_container"></div>

         {% block lib_javascripts %}
              {{ encore_entry_script_tags('app') }}
         {% endblock %}
         {% block javascripts %}{% endblock %}
    </body>
</html>                

你可以建造和观看。在你的项目目录中,你可以这样做:

./node_modules/.bin/encore dev --watch