Book Image

Learning jQuery 3 - Fifth Edition

By : Jonathan Chaffer, Karl Swedberg
Book Image

Learning jQuery 3 - Fifth Edition

By: Jonathan Chaffer, Karl Swedberg

Overview of this book

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.
Table of Contents (23 chapters)
Title Page
Credits
About the Authors
About the Reviewer
www.PacktPub.com
Customer Feedback
Dedication
Preface

Ajax and events


Suppose we wanted to allow each dictionary term name to control the display of the definition that follows; clicking on the term name would show or hide the associated definition. With the techniques we have seen so far, this should be pretty straightforward:

$(() => {
  $('h3.term')
    .click((e) => {
      $(e.target)
        .siblings('.definition')
        .slideToggle();
    });
}); 

Listing 6.16

When a term is clicked on, this code finds siblings of the element that have a class of definition, and slides them up or down as appropriate.

All seems in order, but a click does nothing with this code. Unfortunately, the terms have not yet been added to the document when we attach the click handlers. Even if we managed to attach click handlers to these items, once we clicked on a different letter the handlers would no longer be attached.

This is a common problem with areas of a page populated by Ajax. A popular solution is to rebind handlers each time the page area is refreshed...