Book Image

Front-End Development Projects with Vue.js

By : Raymond Camden, Hugo Di Francesco, Clifford Gurney, Philip Kirkbride, Maya Shavin
Book Image

Front-End Development Projects with Vue.js

By: Raymond Camden, Hugo Di Francesco, Clifford Gurney, Philip Kirkbride, Maya Shavin

Overview of this book

Are you looking to use Vue 2 for web applications, but don't know where to begin? Front-End Development Projects with Vue.js will help build your development toolkit and get ready to tackle real-world web projects. You'll get to grips with the core concepts of this JavaScript framework with practical examples and activities. Through the use-cases in this book, you'll discover how to handle data in Vue components, define communication interfaces between components, and handle static and dynamic routing to control application flow. You'll get to grips with Vue CLI and Vue DevTools, and learn how to handle transition and animation effects to create an engaging user experience. In chapters on testing and deploying to the web, you'll gain the skills to start working like an experienced Vue developer and build professional apps that can be used by other people. You'll work on realistic projects that are presented as bitesize exercises and activities, allowing you to challenge yourself in an enjoyable and attainable way. These mini projects include a chat interface, a shopping cart and price calculator, a to-do app, and a profile card generator for storing contact details. By the end of this book, you'll have the confidence to handle any web development project and tackle real-world front-end development problems.
Table of Contents (16 chapters)
Preface

Computed Properties

Computed properties are a unique data type that will reactively update when source data used within the property is updated. They may look like a Vue method, but they are not. In Vue, we can track changes to a data property by defining them as a computed property, add custom logic within this property, and use it anywhere within the component to return a value. Computed properties are cached by Vue, making them more performant for returning data than a data prop or using a Vue method.

Instances where you may use a computed property include but are not limited to:

  • Form validation:

    In this example, an error message will appear when the total data property is less than 1. The computed property for total will update every time a new piece of data is added to the items array:

    <template>
        <div>{{errorMessage}}</div>
    </template>
    <script>
        export default {
         ...