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

Watchers

Vue watchers programmatically observe component data and run whenever a particular property changes. Watched data can contain two arguments: oldVal and newVal. This can help you when writing expressions to compare data before writing or binding new values. Watchers can observe objects as well as string, number, and array types. When observing objects, it will only trigger the handler if the whole object changes.

In Chapter 1, Starting Your First Vue Project, we introduced life cycle hooks that run at specific times during a component's lifespan. If the immediate key is set to true on a watcher, then when this component initializes it will run this watcher on creation. You can watch all keys inside of any given object by including the key and value deep: true (default is false) To clean up your watcher code, you can assign a handler argument to a defined Vue method, which is best practice for large projects.

Watchers complement the usage of computed data since they...