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Home > Web Development > Web Utilities > Learning jQuery - Fourth Edition
Learning jQuery - Fourth Edition
Learning jQuery - Fourth Edition

Learning jQuery - Fourth Edition: Add to your current website development skills with this brilliant guide to JQuery. This step by step course needs little prior JavaScript knowledge so is suitable for beginners and more seasoned developers alike. , Fourth Edition

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Learning jQuery - Fourth Edition

Chapter 2. 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 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

  • Custom jQuery extensions to the standard set of CSS selectors

  • The DOM traversal methods, which provide greater flexibility for accessing elements on the page

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, 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 of all the other elements...

Using the $() function

The resulting set of elements from jQuery's selectors and methods is always represented by a jQuery object. Such a jQuery object is 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 slick 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: https://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.

Tip

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 https://en.wikipedia.org/wiki/Progressive_enhancement.

To begin learning how jQuery works with CSS selectors, we'll use a structure that appears on many websites, often for navigation – the nested...

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: #fff;
  padding...

Custom selectors

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

Tip

Performance note

When 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 and performance is very important.

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...

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 at our disposal, 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...

Accessing DOM elements

Every selector expression and most jQuery methods return a jQuery object. This is almost always what we want because of the implicit iteration and chaining capabilities that it affords.

Still, there may be points in our code when we need to access a DOM element directly. For example, we may need to make a resulting set of elements available to another JavaScript library, or we might need to access an element's tag name, which is available as a property of the DOM element. For these admittedly rare situations, jQuery provides the .get() method. To access the first DOM element referred to by a jQuery object, for example, we would use .get(0). So, if we want to know the tag name of an element with an ID of my-element, we would write:

varmyTag = $('#my-element').get(0).tagName;

For even greater convenience, jQuery provides a shorthand for .get(). Instead of writing the previous line, we can use square brackets immediately following the selector:

varmyTag = $('#my-element'...

Summary

With the techniques that we have covered in this chapter, we should now be able to locate sets of elements on the page in a variety of ways. In particular, we learned how to style top-level and sub-level items in a nested list by using basic CSS selectors, how to apply different styles to different types of links by using attribute selectors, add rudimentary striping to a table by using either the custom jQuery selectors :odd and :even or the advanced CSS selector :nth-child(), and highlight text within certain table cells by chaining jQuery methods.

So far, we have been using the $(document).ready() method to add a class to a matched set of elements. In the next chapter, we'll explore ways in which to add a class in response to a variety of user-initiated events.

Further reading

The topic of selectors and traversal methods will be explored in more detail in Chapter 9, Advanced Selectors and Traversing. A complete list of jQuery's selectors and traversal methods is available in Appendix...

Exercises

To complete these exercises, you will need the index.html file for this chapter, as well as the finished JavaScript code as found in complete.js. These files can be downloaded from the Packt Publishing web site at https://www.packtpub.com/support.

Challenge exercises may require the use of the official jQuery documentation at https://api.jquery.com/:

  1. Add a class of special to all of the <li> elements at the second level of the nested list.

  2. Add a class of year to all the table cells in the third column of a table.

  3. Add the class special to the first table row that has the word Tragedy in it.

  4. Challenge: Select all the list items (<li>s) containing a link (<a>). Add the class afterlink to the sibling list items that follow the ones selected.

  5. Challenge: Add the class tragedy to the closest ancestor <ul> of any .pdf link.

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Key benefits

  • An introduction to jQuery that requires minimal programming experience
  • Detailed solutions to specific client-side problems
  • Revised and updated version of this popular jQuery book

Description

To build interesting, interactive sites, developers are turning to JavaScript libraries such as jQuery to automate common tasks and simplify complicated ones. Because many web developers have more experience with HTML and CSS than with JavaScript, the library's design lends itself to a quick start for designers with little programming experience. Experienced programmers will also be aided by its conceptual consistency. LearningjQuery - Fourth Edition is revised and updated version of jQuery. You will learn the basics of jQuery for adding interactions and animations to your pages. Even if previous attempts at writing JavaScript have left you baffled, this book will guide you past the pitfalls associated with AJAX, events, effects, and advanced JavaScript language features. Starting with an introduction to jQuery, you will first be shown how to write a functioning jQuery program in just three lines of code. Learn how to add impact to your actions through a set of simple visual effects and to create, copy, reassemble, and embellish content using jQuery's DOM modification methods. The book will take you through many detailed, real-world examples, and even equip you to extend the jQuery library itself with your own plug-ins.

Who is this book for?

This book is for web designers who want learn jQuery to create interactive elements for their designs, as well as developers who want to create the best user interface for their web applications. Basic JavaScript programming and knowledge of HTML and CSS is required. No knowledge of jQuery is assumed, nor is experience with any other JavaScript libraries.

What you will learn

  • Create interactive elements for your web designs
  • Learn 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
  • Make things happen on your webpages with events
  • Add flair to your actions with a variety of animation effects
  • Discover the new features available in jQuery in this third update of this popular jQuery book

Product Details

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Publication date, Length, Edition, Language, ISBN-13
Publication date : Jun 25, 2013
Length: 444 pages
Edition : 4th
Language : English
ISBN-13 : 9781782163152
Category :
Web Development
Languages :
JavaScript
Concepts :
Web Utilities
Tools :
jQuery

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Product Details

Publication date : Jun 25, 2013
Length: 444 pages
Edition : 4th
Language : English
ISBN-13 : 9781782163152
Category :
Web Development
Languages :
JavaScript
Concepts :
Web Utilities
Tools :
jQuery

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Table of Contents

13 Chapters
Getting Started Chevron down icon Chevron up icon
Getting Started
What jQuery does
Why jQuery works well
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 $() function
CSS selectors
Attribute selectors
Custom selectors
DOM traversal methods
Accessing DOM elements
Summary
Exercises
Handling Events Chevron down icon Chevron up icon
Handling Events
Performing tasks on page load
Handling simple events
Event propagation
Altering the journey – the event object
Removing an event handler
Simulating user interaction
Summary
Exercises
Styling and Animating Chevron down icon Chevron up icon
Styling and Animating
Modifying CSS with inline properties
Hiding and showing elements
Effects and duration
Creating custom animations
Simultaneous versus queued effects
Summary
Exercises
Manipulating the DOM Chevron down icon Chevron up icon
Manipulating the DOM
Manipulating attributes and properties
DOM tree manipulation
Copying elements
Content getter and setter methods
DOM manipulation methods in a nutshell
Summary
Exercises
Sending Data with Ajax Chevron down icon Chevron up icon
Sending Data with Ajax
Loading data on demand
Choosing a data format
Passing data to the server
Delivering different content for Ajax requests
Keeping an eye on the request
Error handling
Ajax and events
Security limitations
Exploring additional options
Summary
Exercises
Using Plugins Chevron down icon Chevron up icon
Using Plugins
Finding plugins and help
Using a plugin
Other types of plugins
The jQuery UI plugin library
The jQuery Mobile plugin library
Summary
Exercises
Developing Plugins Chevron down icon Chevron up icon
Developing Plugins
Using the dollar ($) 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
Multiproperty 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

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Rating distribution
Full star icon Full star icon Full star icon Full star icon Half star icon 4.2
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Klen Aug 23, 2013
Full star icon Full star icon Full star icon Full star icon Full star icon 5
I have the third edition and bought this fourth one to refresh my skills (I do JavaScript programming very often these days). The book was great when I started serious programming (with 3rd edition) and it's great now. Recommended!
Amazon Verified review Amazon
Alex Babushka Jul 11, 2013
Full star icon Full star icon Full star icon Full star icon Full star icon 5
Learning jQuery is an outstanding book written by the masters and accessible to anyone with at least a basic understanding of JavaScript. The authors take a truly comprehensive approach to the subject, providing in-depth explanations of the library's fundamentals as well as more advanced features and packing the book with useful code examples.Now in its fourth edition, this text has finally received a much needed update covering the latest versions of jQuery 1.10 and 2.0. An entire chapter is dedicated to building plugins - just what I needed! Also, two (newly refreshed) chapters each on event handling, effects and Ajax methods leave virtually no stone unturned.If you are just starting out with jQuery, don't waste your time reading a For Dummies book; instead, pick up a copy of this 400 page bad boy (or a digital edition available directly from Packt Publishing) and it'll be the only book you'll need to read.
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AddictedShopper Dec 25, 2013
Full star icon Full star icon Full star icon Full star icon Full star icon 5
This is the best jQuery book out there. It's clear and comprehensive. You do need to know a little HTML and Javascript to follow along. All of the code examples worked except for that code example 9 from chapter 9(advance selector, group filter). In order to get the code examples, I think you need an account on the publisher's website. Overall, the book is very good.Update: the code is now available at book.learningjquery.com so you don't have to go through packt. I upped the rating from 4 to 5 stars
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James M. Johnson III Mar 26, 2015
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Great book, if a little dry.
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AU Aug 13, 2014
Full star icon Full star icon Full star icon Full star icon Full star icon 5
I care about details and this book gives me all of it. It even gives you a little review of JavaScript.
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