Book Image

Mastering Bootstrap 4

Book Image

Mastering Bootstrap 4

Overview of this book

Bootstrap 4 is a free CSS and JavaScript framework that allows developers to rapidly build responsive web-interfaces. Right from the first chapter, dive into building a customized Bootstrap website from scratch. Get to grips with Bootstrap’s key features and quickly discover the various ways in which Bootstrap can help you develop web-interfaces. Then take walk through the fundamental features, such as its grid system, helper classes, and responsive utilities. When you have mastered these, you will discover how to structure page layouts, use forms, style different types of content and utilize Bootstrap’s various navigation components. Among other things, you will also tour the anatomy of a Bootstrap plugin, creating your own custom components and extending Bootstrap using jQuery. Finally, you will discover how to optimize your website and integrate it with third-party frameworks. By the end of this book, you will have a thorough knowledge of the framework’s ins and outs, and be able to build highly customizable and optimized web interfaces.
Table of Contents (15 chapters)
Mastering Bootstrap 4
Credits
About the Authors
About the Reviewers
www.PacktPub.com
Preface

Anatomy of a plugin


Bootstrap jQuery plugins all follow the same convention in how they are constructed. At the top level, a plugin is generally split across two files, a JavaScript file and a Sass file. For example, the Alert component is made up of bootstrap/js/alert.js and bootstrap/scss/_alert.scss. These files are compiled and concatenated as part of Bootstrap's distributable JavaScript and CSS files. Let us look at these two files in isolation to learn about the anatomy of a plugin.

JavaScript

Open up any JavaScript file in bootstrap/js/src, and you will see that they all follow the same pattern: an initial setup, a class definition, data API implementation, and jQuery extension. Let's take a detailed look at alert.js.

Setup

The alert.js file, written in ECMAScript 2015 syntax (also known as ES6, the latest (at the time of writing) standardized specification of JavaScript), first imports a utilities module:

    import Util from './util'

A constant is then created, named Alert, which is assigned...