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Vue.js 2.x by Example
Vue.js 2.x by Example

Vue.js 2.x by Example: Example-driven guide to build web apps with Vue.js for beginners

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Vue.js 2.x by Example

Displaying, Looping, Searching, and Filtering Data

In Chapter 1, Getting Started with Vue.js, we covered the data, computed, and method objects within Vue and how to display static data values. In this chapter, were are going to cover:

  • Displaying lists and more complex data with Vue using v-if, v-else, and v-for
  • Filtering the lists using form elements
  • Applying conditional CSS classes based on the data

The data we are going to be using is going to be randomly generated by the JSON generator service (http://www.json-generator.com/). This website allows us to get dummy data to practice with. The following template was used to generate the data we will be using. Copy the following into the left-hand side to generate data of the same format so the attributes match with the code examples, as follows:

      [
'{{repeat(5)}}',
{
index: '{{index...

HTML declarations 

Vue allows you to use HTML tags and attributes to control and alter the view of your application. This involves setting attributes dynamically, such as alt and href. It also allows you to render tags and components based on data in the application. These attributes begin with a v- and, as mentioned at the beginning of this book, get removed from the HTML on render. Before we start outputting and filtering our data, we'll run through a few of the common declarations.

v-html

The v-html directive allows you to output content without using the mustache-style curly bracket syntax. It can also be used if your output contains HTML tags – it will render the output as HTML instead of plain text....

Conditional rendering

Using custom HTML declarations, Vue allows you to render elements and contents conditionally based on data attributes or JavaScript declarations. These include v-if, for showing a container whether a declaration equates to true, and v-else, to show an alternative.

v-if

The most basic example of this would be the v-if directive – determining a value or function if the block should be displayed.

Create a Vue instance with a single div inside the view and a data key, isVisible, set to false.

View:

Start off with the view code as the following:

      <div id="app">
<div>Now you see me</div>
</div>

JavaScript:

In the JavaScript, initialize Vue and create...

v-for and displaying our data

The next HTML declaration means we can start displaying our data and putting some of these attributes into practice. As our data is an array, we will need to loop through it to display each element. To do this, we will use the v-for directive.

Generate your JSON and assign it to a variable called people. During these examples, the generated JSON loop will be displayed in the code blocks as [...]. Your Vue app should look like the following:

      const app = new Vue({
el: '#app',

data: {
people: [...]
}
});

We now need to start displaying each person's name in our View as a bulleted list. This is where the v-for directive comes in:

      <div id="app">
<ul>
<li v-for="person in people">
{{ person }}
</li>
</ul...

Filtering our data

With our data being listed out, we are now going to build filtering ability. This will allow a user to select a field to filter by and a text field to enter their query. The Vue application will then filter the rows as the user types. To do this, we are going to bind some form inputs to various values in the data object, create a new method, and use a new directive on the table rows; v-show.

Building the form

Start off by creating the HTML in your view. Create a <select> box with an <option> for each field you want to filter, an <input> for the query, and a pair of radio buttons – we'll use these to filter active and non-active users. Make sure the value attribute of each &lt...

Showing and hiding Vue content

Along with v-if for showing and hiding content, you can also use the v-show="" directive. v-show is very similar to v-if; they both get added to the HTML wrapper and can both accept the same parameters, including a function.

The difference between the two is v-if alters the markup, removing and adding HTML elements as required, whereas v-show renders the element regardless, hiding and showing the element with inline CSS styles. v-if is much more suited to runtime renders or infrequent user interactivities as it could potentially be restructuring the whole page. v-show is favorable when lots of elements are quickly coming in and out of view, for example, when filtering!

When using v-show with a method, the function needs to return just a true or false. The function has no concept of where it is being used, so we need to pass in the current...

Changing CSS classes

As with any HTML attribute, Vue is able to manipulate CSS classes. As with everything in Vue, this can be done in a myriad of ways ranging from attributes on the object itself to utilizing methods. We'll start off adding a class if the user is active.

Binding a CSS class is similar to other attributes. The value takes an object that can calculate logic from within the view or be abstracted out into our Vue instance. This all depends on the complexity of the operation.

First, let's add a class to the cell containing the isActive variable if the user is active:

      <td v-bind:class="{ active: person.isActive }">
{{ activeStatus(person) }}
</td>

The class HTML attribute is first prepended by v-bind: to let Vue know it needs to process the attribute. The value is then an object, with the CSS class as the key and the...

Filtering and custom classes

We now have a fully fledged user list/register that has filtering on selected fields and custom CSS classes depending on the criteria. To recap, this is what our view looks like now we have the filter in place:

      <div id="app">
<form>
<label for="fiterField">
Field:
<select id="filterField" v-model="filterField">
<option value="">Disable filters</option>
<option value="isActive">Active user</option>
<option value="name">Name</option>
<option value="email">Email</option>
<option value="balance">Balance</option>
<option value="registered">Date registered...

Summary

In this chapter, we looked at Vue HTML declarations, conditionally rendering our HTML and showing an alternative if required. We also put into practice what we learned about methods. Lastly, we built a filtering component for our table, allowing us to show active and inactive users, find users with specific names and emails, and filter out rows based on the balance.

Now we've got to a good point in our app, it's a good opportunity to take a look at our code to see if it can be optimized in any way. By optimizations, I mean reducing repetition, making the code simpler if possible, and abstracting logic out into smaller, readable, and reusable chunks.

In Chapter 3, Optimizing Our App and Using Components to Display Data, we will optimize our code and look at Vue components as a way of separating out logic into separate segments and sections.

...
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Key benefits

  • We bridge the gap between "learning" and "doing" by providing real-world examples that will improve your web development skills with Vue.js
  • Explore the exciting features of Vue.js 2 through practical and interesting examples
  • Explore modern development tools and learn how to utilize them by building applications with Vue.js

Description

Vue.js is a frontend web framework which makes it easy to do just about anything, from displaying data up to creating full-blown web apps, and has become a leading tool for web developers. This book puts Vue.js into a real-world context, guiding you through example projects that helps you build Vue.js applications from scratch. With this book, you will learn how to use Vue.js by creating three Single Page web applications. Throughout this book, we will cover the usage of Vue, for building web interfaces, Vuex, an official Vue plugin which makes caching and storing data easier, and Vue-router, a plugin for creating routes and URLs for your application. Starting with a JSON dataset, the first part of the book covers Vue objects and how to utilize each one. This will be covered by exploring different ways of displaying data from a JSON dataset. We will then move on to manipulating the data with filters and search and creating dynamic values. Next, you will see how easy it is to integrate remote data into an application by learning how to use the Dropbox API to display your Dropbox contents in an application In the final section, you will see how to build a product catalog and dynamic shopping cart using the Vue-router, giving you the building blocks of an e-commerce store.

Who is this book for?

This book is for developers who know the basics of JavaScript and are looking to learn Vue.js with real examples. You should understand the basics of JavaScript functions and variables and be comfortable with using CSS or a CSS framework for styling your projects.

What you will learn

  • Looping through data with Vue.js
  • Searching and filtering data
  • Using components to display data
  • Getting a list of files using the dropbox API
  • Navigating through a file tree and loading folders from a URL
  • Caching with Vuex
  • Pre-caching for faster navigation
  • Introducing vue-router and loading components
  • Using vue-router dynamic routes to load data
  • Using vue-router and Vuex to create an ecommerce store
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Publication date : Dec 27, 2017
Length: 412 pages
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Language : English
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ISBN-13 : 9781788293464
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Table of Contents

12 Chapters
Getting Started with Vue.js Chevron down icon Chevron up icon
Displaying, Looping, Searching, and Filtering Data Chevron down icon Chevron up icon
Optimizing your App and Using Components to Display Data Chevron down icon Chevron up icon
Getting a List of Files Using the Dropbox API Chevron down icon Chevron up icon
Navigating through the File Tree and Loading Folders from the URL Chevron down icon Chevron up icon
Caching the Current Folder Structure Using Vuex Chevron down icon Chevron up icon
Pre-Caching Other Folders and Files for Faster Navigation Chevron down icon Chevron up icon
Introducing Vue-Router and Loading URL-Based Components Chevron down icon Chevron up icon
Using Vue-Router Dynamic Routes to Load Data Chevron down icon Chevron up icon
Building an E-Commerce Store – Browsing Products Chevron down icon Chevron up icon
Building an E-Commerce Store – Adding a Checkout Chevron down icon Chevron up icon
Using Vue Dev Tools and Testing Your SPA Chevron down icon Chevron up icon

Customer reviews

Rating distribution
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(2 Ratings)
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Bogdan Balc Jan 19, 2018
Full star icon Full star icon Full star icon Full star icon Full star icon 5
I was a technical reviewer for this book and I would like to mention a couple of things that to me seem very important for any potential reader.This book will give you the very basics of Vue.js, the things you must know in order to develop the most impressive web apps. In my opinion the author managed to do something that is very rarely seen in a book like this, to capture the inner workings of the framework with the example projects which are explained quite well. This way you don't get only some basic understanding of major functionalities in Vue.js but also an in depth view of what makes Vue.js tick!
Amazon Verified review Amazon
Amazon Customer Jan 13, 2018
Full star icon Full star icon Full star icon Full star icon Full star icon 5
Mike Street wrote an awesome book. Each chapter you read will teach something useful and in the right way. Vue.js is a great javascript framework to work with and has a lot of feature. Most of those features can be found in this book while developing an app.It covers from the basic to some advanced concepts.
Amazon Verified review Amazon
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