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Home > Web Development > Front End Web Development > Learning jQuery 3
Learning jQuery 3
Learning jQuery 3

Learning jQuery 3: Interactive front-end website development , Fifth Edition

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Learning jQuery 3

Selecting Elements

The jQuery library harnesses the power of Cascading Style Sheets (CSS) selectors to let us quickly and easily access elements or groups of elements in the Document Object Model (DOM).

In this chapter, we will cover:

  • The structure of the elements on a web page
  • How to use CSS selectors to find elements on the page
  • What happens when the specificity of a CSS selector changes
  • Custom jQuery extensions to the standard set of CSS selectors
  • The DOM traversal methods, which provide greater flexibility for accessing elements on the page
  • Using modern JavaScript language features to iterate over jQuery objects efficiently

Understanding the DOM

One of the most powerful aspects of jQuery is its ability to make selecting elements in the DOM easy. The DOM serves as the interface between JavaScript and a web page; it provides a representation of the source HTML as a network of objects rather than as plain text.

This network takes the form of a family tree of elements on the page. When we refer to the relationships that elements have with one another, we use the same terminology that we use when referring to family relationships: parents, children, siblings, and so on. A simple example can help us understand how the family tree metaphor applies to a document:

<html> 
  <head> 
    <title>the title</title> 
  </head> 
  <body> 
    <div> 
      <p>This is a paragraph.</p> 
      <p>This is another paragraph.</p> 
      <p>This is yet another paragraph.</p> 
    </div...

Using the $() function

The resulting set of elements from jQuery's selectors and methods is always represented by a jQuery object. These objects are very easy to work with when we want to actually do something with the things that we find on a page. We can easily bind events to these objects and add visual effects to them, as well as chain multiple modifications or effects together.

Note that jQuery objects are different from regular DOM elements or node lists, and as such do not necessarily provide the same methods and properties for some tasks. In the final part of this chapter, we will look at ways to directly access the DOM elements that are collected within a jQuery object.

In order to create a new jQuery object, we use the $() function. This function typically accepts a CSS selector as its sole parameter and serves as a factory, returning a new jQuery object pointing to the corresponding elements...

CSS selectors

The jQuery library supports nearly all the selectors included in CSS specifications 1 through 3, as outlined on the World Wide Web Consortium's site: http://www.w3.org/Style/CSS/specs. This support allows developers to enhance their websites without worrying about which browsers might not understand more advanced selectors, as long as the browsers have JavaScript enabled.

Progressive Enhancement
Responsible jQuery developers should always apply the concepts of progressive enhancement and graceful degradation to their code, ensuring that a page will render as accurately, even if not as beautifully, with JavaScript disabled as it does with JavaScript turned on. We will continue to explore these concepts throughout the book. More information on progressive enhancement can be found at http://en.wikipedia.org/wiki/Progressive_enhancement. Having said this, it's not very often that you'll encounter...

Selector specificity

Selectors in jQuery have a spectrum of specificity, from very general selectors, to very targeted selectors. The goal is to select the correct elements, otherwise your selector is broken. The tendency for jQuery beginners is to implement very specific selectors for everything. Perhaps through trial and error, they've fixed selector bugs by adding more specificity to a given selector. However, this isn't always the best solution.

Let's look at an example that increases the size of the first letter for top-level <li> text. Here's the style we want to apply:

.big-letter::first-letter {
   font-size: 1.4em;
 }

And here's what the list item text looks like:

As you see, Comedies, Tragedies, and Histories have the big-letter style applied to them as expected. In order to do this, we need a selector that's more specific than just $('#selected-plays...

Understanding the DOM

One of the most powerful aspects of jQuery is its ability to make selecting elements in the DOM easy. The DOM serves as the interface between JavaScript and a web page; it provides a representation of the source HTML as a network of objects rather than as plain text.

This network takes the form of a family tree of elements on the page. When we refer to the relationships that elements have with one another, we use the same terminology that we use when referring to family relationships: parents, children, siblings, and so on. A simple example can help us understand how the family tree metaphor applies to a document:

<html> 
  <head> 
    <title>the title</title> 
  </head> 
  <body> 
    <div> 
      <p>This is a paragraph.</p> 
      <p>This is another paragraph.</p> 
      <p>This is yet another paragraph.</p> 
    </div> 
  </body> 
</html>

Here, <html> is the ancestor...

Using the $() function

The resulting set of elements from jQuery's selectors and methods is always represented by a jQuery object. These objects are very easy to work with when we want to actually do something with the things that we find on a page. We can easily bind events to these objects and add visual effects to them, as well as chain multiple modifications or effects together.

Note

Note that jQuery objects are different from regular DOM elements or node lists, and as such do not necessarily provide the same methods and properties for some tasks. In the final part of this chapter, we will look at ways to directly access the DOM elements that are collected within a jQuery object.

In order to create a new jQuery object, we use the $() function. This function typically accepts a CSS selector as its sole parameter and serves as a factory, returning a new jQuery object pointing to the corresponding elements on the page. Just about anything that can be used in a stylesheet can also be passed...

CSS selectors

The jQuery library supports nearly all the selectors included in CSS specifications 1 through 3, as outlined on the World Wide Web Consortium's site: http://www.w3.org/Style/CSS/specs. This support allows developers to enhance their websites without worrying about which browsers might not understand more advanced selectors, as long as the browsers have JavaScript enabled.

Note

Progressive EnhancementResponsible jQuery developers should always apply the concepts of progressive enhancement and graceful degradation to their code, ensuring that a page will render as accurately, even if not as beautifully, with JavaScript disabled as it does with JavaScript turned on. We will continue to explore these concepts throughout the book. More information on progressive enhancement can be found at http://en.wikipedia.org/wiki/Progressive_enhancement. Having said this, it's not very often that you'll encounter users with JavaScript disabled these days--even on mobile browsers.

To begin learning...

Selector specificity

Selectors in jQuery have a spectrum of specificity, from very general selectors, to very targeted selectors. The goal is to select the correct elements, otherwise your selector is broken. The tendency for jQuery beginners is to implement very specific selectors for everything. Perhaps through trial and error, they've fixed selector bugs by adding more specificity to a given selector. However, this isn't always the best solution.

Let's look at an example that increases the size of the first letter for top-level <li> text. Here's the style we want to apply:

.big-letter::first-letter {
   font-size: 1.4em;
 }

And here's what the list item text looks like:

As you see, Comedies, Tragedies, and Histories have the big-letter style applied to them as expected. In order to do this, we need a selector that's more specific than just $('#selected-plays li'), which would apply the style to every <li>, even the sub-elements. We can use change the specificity of the jQuery...

Attribute selectors

Attribute selectors are a particularly helpful subset of CSS selectors. They allow us to specify an element by one of its HTML attributes, such as a link's title attribute or an image's alt attribute. For example, to select all images that have an alt attribute, we write the following:

$('img[alt]')

Styling links

Attribute selectors accept a wildcard syntax inspired by regular expressions for identifying the value at the beginning (^) or end ($) of a string. They can also take an asterisk (*) to indicate the value at an arbitrary position within a string or an exclamation mark (!) to indicate a negated value.

Let's say we want to have different styles for different types of links. We first define the styles in our stylesheet:

a { 
  color: #00c;  
} 
a.mailto { 
  background: url(images/email.png) no-repeat right top; 
  padding-right: 18px; 
} 
a.pdflink { 
  background: url(images/pdf.png) no-repeat right top; 
  padding-right: 18px; 
} 
a.henrylink { 
  background-color...

Custom selectors

To the wide variety of CSS selectors, jQuery adds its own custom selectors. These custom selectors enhance the capabilities of CSS selectors to locate page elements in new ways.

Note

Performance noteWhen possible, jQuery uses the native DOM selector engine of the browser to find elements. This extremely fast approach is not possible when custom jQuery selectors are used. For this reason, it is recommended to avoid frequent use of custom selectors when a native option is available.

Most of the custom selectors allow us to choose one or more elements from a collection of elements that we have already found. The custom selector syntax is the same as the CSS pseudo-class syntax, where the selector starts with a colon (:). For example, to select the second item from a set of <div> elements with a class of horizontal, we write this:

$('div.horizontal:eq(1)')

Note that :eq(1) selects the second item in the set because JavaScript array numbering is zero-based, meaning that it...

DOM traversal methods

The jQuery selectors that we have explored so far allow us to select a set of elements as we navigate across and down the DOM tree and filter the results. If this were the only way to select elements, our options would be somewhat limited. There are many occasions when selecting a parent or ancestor element is essential; that is where jQuery's DOM traversal methods come into play. With these methods, we can go up, down, and all around the DOM tree with ease.

Some of the methods have a nearly identical counterpart among the selector expressions. For example, the line we first used to add the alt class, $('tr:even').addClass('alt'), could be rewritten with the .filter() method as follows:

$('tr')
  .filter(':even')
  .addClass('alt');

For the most part, however, the two ways of selecting elements complement each other. Also, the .filter() method in particular has enormous power because it can take a function as its argument. The function allows us to create complex tests...

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Key benefits

  • - Create a fully featured and responsive client-side application using jQuery
  • - Explore all the latest features of jQuery 3.0 and code examples updated to reflect modern JavaScript environments
  • - Develop high performance interactive pages

Description

If you are a web developer and want to create web applications that look good, are efficient, have rich user interfaces, and integrate seamlessly with any backend using AJAX, then this book is the ideal match for you. We’ll show you how you can integrate jQuery 3.0 into your web pages, avoid complex JavaScript code, create brilliant animation effects for your web applications, and create a flawless app. We start by configuring and customising the jQuery environment, and getting hands-on with DOM manipulation. Next, we’ll explore event handling advanced animations, creating optimised user interfaces, and building useful third-party plugins. Also, we'll learn how to integrate jQuery with your favourite back-end framework. Moving on, we’ll learn how the ECMAScript 6 features affect your web development process with jQuery. we’ll discover how to use the newly introduced JavaScript promises and the new animation API in jQuery 3.0 in great detail, along with sample code and examples. By the end of the book, you will be able to successfully create a fully featured and efficient single page web application and leverage all the new features of jQuery 3.0 effectively.

Who is this book for?

This book is ideal for client-side JavaScript developers. You do need to have any previous experience with jQuery, although basic JavaScript programming knowledge is necessary.

What you will learn

  • -Create custom interactive elements for your web designs
  • -Find out how to create the best user interface for your web applications
  • -Use selectors in a variety of ways to get anything you want from a page when you need it
  • -Master events to bring your web pages to life
  • -Add flair to your actions with a variety of different animation effects
  • -Discover the latest features available in jQuery with the latest update of this incredibly popular title
  • -Using jQuery npm Packages

Product Details

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Publication date, Length, Edition, Language, ISBN-13
Publication date : May 29, 2017
Length: 448 pages
Edition : 5th
Language : English
ISBN-13 : 9781785882982
Category :
Web Development
Languages :
JavaScript
Concepts :
Front End Web Development
Tools :
jQuery

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Publication date : May 29, 2017
Length: 448 pages
Edition : 5th
Language : English
ISBN-13 : 9781785882982
Category :
Web Development
Languages :
JavaScript
Concepts :
Front End Web Development
Tools :
jQuery

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Learning jQuery 3
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Table of Contents

14 Chapters
Getting Started Chevron down icon Chevron up icon
Getting Started
What jQuery does?
Why jQuery works well?
What's new in jQuery 3?
Making our first jQuery-powered web page
Plain JavaScript versus jQuery
Using development tools
Summary
Selecting Elements Chevron down icon Chevron up icon
Selecting Elements
Understanding the DOM
Using the $() function
CSS selectors
Selector specificity
Attribute selectors
Custom selectors
DOM traversal methods
Iterating over jQuery objects
Accessing DOM elements
Summary
Exercises
Handling Events Chevron down icon Chevron up icon
Handling Events
Performing tasks on page load
Handling simple events
Event propagation
Altering the journey - the event object
Removing an event handler
Simulating user interaction
Summary
Exercises
Styling and Animating Chevron down icon Chevron up icon
Styling and Animating
Modifying CSS with inline properties
Hiding and showing elements
Effects and duration
Creating custom animations
Simultaneous versus queued effects
Summary
Exercises
Manipulating the DOM Chevron down icon Chevron up icon
Manipulating the DOM
Manipulating attributes and properties
DOM tree manipulation
Copying elements
Content getter and setter methods
DOM manipulation methods in a nutshell
Summary
Exercises
Sending Data with Ajax Chevron down icon Chevron up icon
Sending Data with Ajax
Loading data on demand
Choosing a data format
Passing data to the server
Keeping an eye on the request
Error handling
Ajax and events
Deferreds and promises
Summary
Exercises
Using Plugins Chevron down icon Chevron up icon
Using Plugins
Using a plugin
Other types of plugins
The jQuery UI plugin library
The jQuery Mobile plugin library
Summary
Exercises
Developing Plugins Chevron down icon Chevron up icon
Developing Plugins
Using the dollar ($) alias in plugins
Adding new global functions
Adding jQuery object methods
Providing flexible method parameters
Creating plugins with the jQuery UI widget factory
Plugin design recommendations
Summary
Exercises
Advanced Selectors and Traversing Chevron down icon Chevron up icon
Advanced Selectors and Traversing
Selecting and traversing revisited
Customizing and optimizing selectors
DOM traversal under the hood
Summary
Exercises
Advanced Events Chevron down icon Chevron up icon
Advanced Events
Revisiting events
Event delegation
Defining custom events
Throttling events
Extending events
Summary
Further reading
Exercises
Advanced Effects Chevron down icon Chevron up icon
Advanced Effects
Animation revisited
Observing and interrupting animations
Using global effect properties
Multi-property easing
Using deferred objects
Taking fine-grained control of animations
Summary
Exercises
Advanced DOM Manipulation Chevron down icon Chevron up icon
Advanced DOM Manipulation
Sorting table rows
Moving and inserting elements revisited
Storing data alongside DOM elements
Using HTML5 custom data attributes
Sorting and building rows with JSON
Revisiting attribute manipulation
Summary
Exercises
Advanced Ajax Chevron down icon Chevron up icon
Advanced Ajax
Implementing progressive enhancement with Ajax
Handling Ajax errors
Using the jqXHR object
Throttling Ajax requests
Extending Ajax capabilities
Summary
Exercises
Appnedix A – Testing JavaScript with QUnit Chevron down icon Chevron up icon
Appnedix A – Testing JavaScript with QUnit
Downloading QUnit
Setting up the document
Organizing tests
Adding and running tests
Other types of tests
Practical considerations
Summary

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Customer reviews

Rating distribution
Full star icon Full star icon Half star icon Empty star icon Empty star icon 2.7
(3 Ratings)
5 star 0%
4 star 33.3%
3 star 33.3%
2 star 0%
1 star 33.3%
Cliente de Amazon Aug 15, 2017
Full star icon Full star icon Full star icon Full star icon Empty star icon 4
Great tutorial ,perfect for begginers, updated to jquery 3.0
Amazon Verified review Amazon
Braain kumar Oct 05, 2017
Full star icon Full star icon Full star icon Empty star icon Empty star icon 3
Good for moderate learners not for too advance
Amazon Verified review Amazon
RSG Jul 22, 2021
Full star icon Empty star icon Empty star icon Empty star icon Empty star icon 1
What I can't understand is how this book has reached the lofty level of "Fifth Edition" considering that it reads like the result of late-night Googling. The code snippets introduce variables and structures that are not even mentioned in the text. Very poor writing and editing!
Amazon Verified review Amazon

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About the author

Profile icon Jonathan Chaffer
Jonathan Chaffer
Jonathan Chaffer is a member of Rapid Development Group, a web development firm located in Grand Rapids, Michigan. His work there includes overseeing and implementing projects in a wide variety of technologies, with an emphasis on PHP, MySQL, and JavaScript. In the open source community, he has been very active in the Drupal CMS project, which has adopted jQuery as its JavaScript framework of choice. He is the creator of the Content Construction Kit, now a part of the Drupal core used to manage structured content. He is also responsible for major overhauls of Drupal's menu system and developer API reference. In his spare time, he designs board and card games for the hobby market. He lives in Grand Rapids with his wife, Jennifer.
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To cancel your subscription with us simply go to the account page - found in the top right of the page or at https://subscription.packtpub.com/my-account/subscription - From here you will see the ‘cancel subscription’ button in the grey box with your subscription information in.

What are credits? Chevron down icon Chevron up icon

Credits can be earned from reading 40 section of any title within the payment cycle - a month starting from the day of subscription payment. You also earn a Credit every month if you subscribe to our annual or 18 month plans. Credits can be used to buy books DRM free, the same way that you would pay for a book. Your credits can be found in the subscription homepage - subscription.packtpub.com - clicking on ‘the my’ library dropdown and selecting ‘credits’.

What happens if an Early Access Course is cancelled? Chevron down icon Chevron up icon

Projects are rarely cancelled, but sometimes it's unavoidable. If an Early Access course is cancelled or excessively delayed, you can exchange your purchase for another course. For further details, please contact us here.

Where can I send feedback about an Early Access title? Chevron down icon Chevron up icon

If you have any feedback about the product you're reading, or Early Access in general, then please fill out a contact form here and we'll make sure the feedback gets to the right team. 

Can I download the code files for Early Access titles? Chevron down icon Chevron up icon

We try to ensure that all books in Early Access have code available to use, download, and fork on GitHub. This helps us be more agile in the development of the book, and helps keep the often changing code base of new versions and new technologies as up to date as possible. Unfortunately, however, there will be rare cases when it is not possible for us to have downloadable code samples available until publication.

When we publish the book, the code files will also be available to download from the Packt website.

How accurate is the publication date? Chevron down icon Chevron up icon

The publication date is as accurate as we can be at any point in the project. Unfortunately, delays can happen. Often those delays are out of our control, such as changes to the technology code base or delays in the tech release. We do our best to give you an accurate estimate of the publication date at any given time, and as more chapters are delivered, the more accurate the delivery date will become.

How will I know when new chapters are ready? Chevron down icon Chevron up icon

We'll let you know every time there has been an update to a course that you've bought in Early Access. You'll get an email to let you know there has been a new chapter, or a change to a previous chapter. The new chapters are automatically added to your account, so you can also check back there any time you're ready and download or read them online.

I am a Packt subscriber, do I get Early Access? Chevron down icon Chevron up icon

Yes, all Early Access content is fully available through your subscription. You will need to have a paid for or active trial subscription in order to access all titles.

How is Early Access delivered? Chevron down icon Chevron up icon

Early Access is currently only available as a PDF or through our online reader. As we make changes or add new chapters, the files in your Packt account will be updated so you can download them again or view them online immediately.

How do I buy Early Access content? Chevron down icon Chevron up icon

Early Access is a way of us getting our content to you quicker, but the method of buying the Early Access course is still the same. Just find the course you want to buy, go through the check-out steps, and you’ll get a confirmation email from us with information and a link to the relevant Early Access courses.

What is Early Access? Chevron down icon Chevron up icon

Keeping up to date with the latest technology is difficult; new versions, new frameworks, new techniques. This feature gives you a head-start to our content, as it's being created. With Early Access you'll receive each chapter as it's written, and get regular updates throughout the product's development, as well as the final course as soon as it's ready.We created Early Access as a means of giving you the information you need, as soon as it's available. As we go through the process of developing a course, 99% of it can be ready but we can't publish until that last 1% falls in to place. Early Access helps to unlock the potential of our content early, to help you start your learning when you need it most. You not only get access to every chapter as it's delivered, edited, and updated, but you'll also get the finalized, DRM-free product to download in any format you want when it's published. As a member of Packt, you'll also be eligible for our exclusive offers, including a free course every day, and discounts on new and popular titles.