Book Image

Learning jQuery 3 - Fifth Edition

By : Jonathan Chaffer
Book Image

Learning jQuery 3 - Fifth Edition

By: Jonathan Chaffer

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

Removing an event handler


There are times when we will be done with an event handler we previously registered. Perhaps the state of the page has changed such that the action no longer makes sense. It is possible to handle this situation with conditional statements inside our event handlers, but it is more elegant to unbind the handler entirely.

Suppose that we want our collapsible style switcher to remain expanded whenever the page is not using the normal style. While the Narrow Column or Large Print button is selected, clicking on the background of the style switcher should do nothing. We can accomplish this by calling the .off() method to remove the collapsing handler when one of the non-default style switcher buttons is clicked:

$(() => {
  $('#switcher')
    .click((e) => {
      if (!$(e.target).is('button')) {
        $(e.currentTarget)
          .children('button')
          .toggleClass('hidden');
      }
    });
  $('#switcher-narrow, #switcher-large')
    .click(() => {...