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Vue.js 2 Cookbook
Vue.js 2 Cookbook

Vue.js 2 Cookbook: Build modern, interactive web applications with Vue.js

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Vue.js 2 Cookbook

Basic Vue.js Features

In this chapter, the following recipes will be covered:

  • Learning how to use computed properties
  • Filtering a list with a computed property
  • Sorting a list with a computed property
  • Formatting currencies with filters
  • Formatting dates with filters
  • Displaying and hiding an element conditionally
  • Adding styles conditionally
  • Adding some fun to your app with CSS transitions
  • Outputing raw HTML
  • Creating a form with checkboxes
  • Creating a form with radio buttons
  • Creating a form with a select element

Introduction

In this chapter, you will find all the building blocks needed to develop a fully functional, interactive, self-contained Vue application. In the first recipe, you will create computed properties that encapsulate the logic you can use to create a more semantic application; you will then explore some more text formatting with filters and the v-html directive. You will create a graphically appealing application with the help of conditional rendering and transitions. Finally, we will build some form elements such as checkboxes and radio buttons.

From now on, all recipes will be written exclusively with ES6. At the time of this writing, if you are using Chrome 9x and JSFiddle to follow along, they should work seamlessly; if you are integrating this code into a bigger project, remember to use Babel (for more information, check out the Using Babel to compile from ES6 recipe in Chapter 8, Organize...

Learning how to use computed properties

Computed properties are data in Vue components that depend on some calculation on other, more primitive data. When this primitive data is reactive, the computed properties are up-to-date and reactive themselves. In this context, primitive is a relative term. You can certainly build computed properties based on other computed properties.

Getting ready

Before venturing to prepare this recipe, be sure to familiarize yourself with the v-model directive and the @event notation. You can complete the React to events like clicks and keystrokes recipe in the preceding chapter if you are unsure.

How to do it...

...

Filtering a list with a computed property

With the earlier version of Vue, filters were used in the v-for directives to only extract some values. They are still called filters, but they are not used in this sense anymore. They are relegated to the role of post-processing for text. To be honest, I never really understood how to use filters in Vue 1 with lists, but that won't be a problem in version 2 because the only proper way to filter a list is to use computed properties.

With this recipe, you will be able to filter your list from the simplest to-do list to the most complex bills-of-materials of a spaceship.

Getting ready

You should have some familiarity with Vue lists and know the basics of computed properties; if you don't, the Writing...

Sorting a list with a computed property

Ordering inside a v-for with a filter is another thing that was considered for removal in Vue 1 and didn't survive in the current version.

Sorting a list with a computed property offers much more flexibility and we can implement any custom logic for ordering. In this recipe, you will create a list with some numbers within; we will sort the list using them.

Getting ready

To complete this recipe, you just require some familiarity with lists and computed properties; you can brush up on them with the Writing lists and Learning how to use computed properties recipes.

How to do it...

...

Formatting currencies with filters

Formatting currencies in Vue 1 was somewhat limited; we will be using the excellent accounting.js library to build a much more powerful filter.

Getting ready

The basics of filtering are explored in the Formatting your text with filters recipe; where you build a basic filter ensure that you complete that, then come back here.

How to do it...

Introduction


In this chapter, you will find all the building blocks needed to develop a fully functional, interactive, self-contained Vue application. In the first recipe, you will create computed properties that encapsulate the logic you can use to create a more semantic application; you will then explore some more text formatting with filters and the v-html directive. You will create a graphically appealing application with the help of conditional rendering and transitions. Finally, we will build some form elements such as checkboxes and radio buttons.

From now on, all recipes will be written exclusively with ES6. At the time of this writing, if you are using Chrome 9x and JSFiddle to follow along, they should work seamlessly; if you are integrating this code into a bigger project, remember to use Babel (for more information, check out the Using Babel to compile from ES6 recipe in Chapter 8, Organize + Automate + Deploy = Webpack).

Learning how to use computed properties


Computed properties are data in Vue components that depend on some calculation on other, more primitive data. When this primitive data is reactive, the computed properties are up-to-date and reactive themselves. In this context, primitive is a relative term. You can certainly build computed properties based on other computed properties.

Getting ready

Before venturing to prepare this recipe, be sure to familiarize yourself with the v-model directive and the @event notation. You can complete the React to events like clicks and keystrokes recipe in the preceding chapter if you are unsure.

How to do it...

A simple example will clarify what a computed property is:

<div id="app"> 
  <input type="text" v-model="name"/> 
  <input type="text" id="surname" value='Snow'/> 
  <button @click="saveSurname">Save Surname</button> 
  <output>{{computedFullName}}</output> 
</div> 

let surname = 'Snow' 
new Vue({ 
  el: '#app...

Filtering a list with a computed property


With the earlier version of Vue, filters were used in the v-for directives to only extract some values. They are still called filters, but they are not used in this sense anymore. They are relegated to the role of post-processing for text. To be honest, I never really understood how to use filters in Vue 1 with lists, but that won't be a problem in version 2 because the only proper way to filter a list is to use computed properties.

With this recipe, you will be able to filter your list from the simplest to-do list to the most complex bills-of-materials of a spaceship.

Getting ready

You should have some familiarity with Vue lists and know the basics of computed properties; if you don't, the Writing lists and Learning how to use computed properties recipes will get you covered.

How to do it...

To get started with this recipe, we need an example list from which to filter our favorite elements. Let's suppose we work for the ACME Research and Development...

Sorting a list with a computed property


Ordering inside a v-for with a filter is another thing that was considered for removal in Vue 1 and didn't survive in the current version.

Sorting a list with a computed property offers much more flexibility and we can implement any custom logic for ordering. In this recipe, you will create a list with some numbers within; we will sort the list using them.

Getting ready

To complete this recipe, you just require some familiarity with lists and computed properties; you can brush up on them with the Writing lists and Learning how to use computed properties recipes.

How to do it...

Let's write a list of the largest dams in the world.

First, we need an HTML table with three columns (Name, Country, Electricity):

<div id="app"> 
<table> 
  <thead> 
    <tr> 
      <th>Name</th> 
      <th>Country</th> 
      <th>Electricity</th> 
    </tr> 
  </thead> 
  <tbody> 
  </tbody> 
&lt...

Formatting currencies with filters


Formatting currencies in Vue 1 was somewhat limited; we will be using the excellent accounting.js library to build a much more powerful filter.

Getting ready

The basics of filtering are explored in the Formatting your text with filters recipe; where you build a basic filter ensure that you complete that, then come back here.

How to do it...

Add accounting.js to your page. Refer to http://openexchangerates.github.io/accounting.js/ for more details on how to do it. If you are using JSFiddle though, you can just add it as an external resource to the left menu. You can add a link to CDN, which is serving it, for example, https://cdn.jsdelivr.net/accounting.js/0.3.2/accounting.js.

This filter will be extremely simple:

Vue.filter('currency', function (money) { 
  return accounting.formatMoney(money) 
})

You can try it out with a one-liner in HTML:

I have {{5 | currency}} in my pocket

It will default to dollars, and it will print I have $5.00 in my pocket.

How it works...

Formatting dates with filters


Sometimes you need a slightly more powerful filter than a basic one. You have to use similar filters many times, but every time with a slight variation. Having too many filters can create confusion. This example with dates will illustrate the problem and the solution.

Getting ready

Before moving ahead, make yourself more comfortable with filters by going through the Formatting your text with filters recipe in Chapter 1Getting started with Vue.js ; if you already know filters, keep reading.

How to do it...

Let's say we are curating an interactive page to learn history. We have our Vue instance with the following JavaScript code:

new Vue({ 
  el:'#app', 
  data: { 
    bastilleStormingDate: '1789-07-14 17 h' 
  } 
})

In our data, we have a date written informally as a string in our instance data. Our HTML can contain a timeline of the French Revolution and, at some point, can contain the following:

<div id="app"> 
  The Storming of the Bastille, happened on ...

Displaying and hiding an element conditionally


Displaying and hiding an element on a web page is fundamental to some designs. You could have a popup, a set of elements that you want to display one at a time, or something that shows only when you click on a button.

In this recipe, we will use conditional display and learn about the important v-if and v-show directives.

Getting ready

Before venturing into this recipe, ensure that you know enough about computed properties or take a look at the Filtering a list with a computed property recipe.

How to do it...

Let's build a ghost that is only visible at night:

<div id="ghost"> 
  <div v-show="isNight"> 
    I'm a ghost! Boo! 
  </div> 
</div>

The v-show guarantees that the <div> ghost will be displayed only when isNight is true. For example, we may write as follows:

new Vue({ 
  el: '#ghost', 
  data: { 
    isNight: true 
  } 
})

This will make the ghost visible. To make the example more real, we can write isNight as a computed...

Adding styles conditionally


One great feature of modern web page architecture is the ability to pack tons of display logic in CSS. This means you can have a very clean and expressive HTML and still create impressive interactive pages via CSS.

Vue is particularly good at expressing relationships between HTML and CSS and allows you to encapsulate complex logic in easy-to-use functions.

In this recipe, we will explore the basics of styling with Vue.

How to do it...

We will build a text area that warns you when you are reaching the maximum allowed number of characters:

<div id="app"> 
  <textarea 
    v-model="memeText" 
    :maxlength="limit"> 
  </textarea> 
  {{memeText.length}} 
</div>

The text written inside will be bound to the memeText variable and the length of our text is written at the end via mustaches.

We want to change the background color when only 10 characters are left. For this, we have to bake a little CSS class warn:

.warn { 
  background-color: mistyrose ...
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Key benefits

  • • Understand and use Vue’s reactivity system, data binding, and computed properties
  • • Create fluid transitions in your application with Vue’s built-in transition system
  • • Use Vuex and Webpack to build medium-to-large scale SPAs and enhance your development workflow

Description

Vue.js is an open source JavaScript library for building modern, interactive web applications. With a rapidly growing community and a strong ecosystem, Vue.js makes developing complex single page applications a breeze. Its component-based approach, intuitive API, blazing fast core, and compact size make Vue.js a great solution to craft your next front-end application. From basic to advanced recipes, this book arms you with practical solutions to common tasks when building an application using Vue. We start off by exploring the fundamentals of Vue.js: its reactivity system, data-binding syntax, and component-based architecture through practical examples. After that, we delve into integrating Webpack and Babel to enhance your development workflow using single file components. Finally, we take an in-depth look at Vuex for state management and Vue Router to route in your single page applications, and integrate a variety of technologies ranging from Node.js to Electron, and Socket.io to Firebase and HorizonDB. This book will provide you with the best practices as determined by the Vue.js community.

Who is this book for?

This book is for developers who want to learn about Vue.js through practical examples to quickly and efficiently build modern, interactive web applications. Prior experience and familiarity with JavaScript, HTML, and CSS are recommended as the recipes build upon that knowledge. It will also enable both new and existing Vue.js users to expand their knowledge of the framework.

What you will learn

  • • Understand the fundamentals of Vue.js through numerous practical examples
  • • Piece together complex web interfaces using the Vue.js component system
  • • Use Webpack and Babel to enhance your development workflow
  • • Manage your application's state using Vuex and see how to structure your projects according to best practices
  • • Seamlessly implement routing in your single page applications using Vue Router
  • • Find out how to use Vue.js with a variety of technologies such as Node.js, Electron, Firebase, and Horizon by building complete applications

Product Details

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Publication date, Length, Edition, Language, ISBN-13
Publication date : Apr 28, 2017
Length: 454 pages
Edition : 1st
Language : English
ISBN-13 : 9781786468093
Languages :

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Product Details

Publication date : Apr 28, 2017
Length: 454 pages
Edition : 1st
Language : English
ISBN-13 : 9781786468093
Languages :

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Table of Contents

11 Chapters
Getting Started with Vue.js Chevron down icon Chevron up icon
Basic Vue.js Features Chevron down icon Chevron up icon
Transitions and Animations Chevron down icon Chevron up icon
All About Components Chevron down icon Chevron up icon
Vue Communicates with the Internet Chevron down icon Chevron up icon
Single Page Applications Chevron down icon Chevron up icon
Unit Testing and End-to-End Testing Chevron down icon Chevron up icon
Organize + Automate + Deploy = Webpack Chevron down icon Chevron up icon
Advanced Vue.js – Directives, Plugins, and Render Functions Chevron down icon Chevron up icon
Large Application Patterns with Vuex Chevron down icon Chevron up icon
Integrating with Other Frameworks Chevron down icon Chevron up icon

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Brandon Galli Feb 04, 2021
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Received PDF version, took a couple days to read and I can say that it was well worth the read and approach of explanation of the MVC nature of Vue and how to get started knowledge was solid. Being a React.js develop myself I endorse this book and recommend it to anyone interested in getting into Vue as it is an exciting and newer JS framework. It was a great read and thank you for the copy.
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Megastar Jan 21, 2021
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It is very well written and very easy to follow!
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Ramanan Kalirajan Jul 31, 2019
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Good book for starting to learn vue js. It has lot of examples and the concepts are explained in simple manner. Good book for starters
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Ralf P. Feb 24, 2018
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Da ich schon erste Erfahrungen mit Vue hatte, habe ich das Buch eigentlich als schnelles Nachschlagewerk für Problemfälle gekauft.Das Buch erfüllt erwartungsgemäß dann auch die Anforderungen an ein "Kochbuch": Passendes Rezept suchen, und bisher habe ich weitgehend alles gefunden, was ich gesucht habe, und anwenden. Mit der festen Struktur und den Unterabschnitten zu jedem Rezept fällt die Orientierung leicht, vom "nur abtipppen wollen" bis zur detaillierten Erklärung und dem immer interessanten "Thers's more..."-Abschnitt.Übertroffen hat das Buch meine Erwartungen, da die Kapitelstruktur sogar zum Einarbeiten in Themenbereiche, und nicht nur Einzelrezepte, ermöglicht. Deshalb klare Kaufempfehlung für alle, die auch abseits vom Computer mal etwas lesen möchten.
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Biro Feb 06, 2018
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Excellent book on Vue. Worth it just for one or two of the recipes. Would be even better if the examples were real world rather than JSFiddle. Nevertheless one of the best software development books I've purchased
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