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  • Learning jQuery 3
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Learning jQuery 3

Learning jQuery 3

By : Jonathan Chaffer
2.7 (3)
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Learning jQuery 3

Learning jQuery 3

2.7 (3)
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 (16 chapters)
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Throttling events


A major issue with the infinite scrolling feature as we've implemented it in Listing 10.10 is its performance impact. While our code is brief, the checkScrollPosition() function does need to do some work to measure the dimensions of the page and window. This effort can accumulate rapidly, because in some browsers the scroll event is triggered repeatedly during the scrolling of the window. The result of this combination could be choppy or sluggish performance.

Several native events have the potential for frequent triggering. Common culprits include scroll, resize, and mousemove. To account for this, we will implement event throttling. This technique involves limiting our expensive calculations so that they only occur after some of the event occurrences, rather than each one. We can update our code from Listing 10.13 to implement this technique as follows:

$(() => { 
  var timer = 0;

  $(window)
    .scroll(() => {
      if (!timer) {
        timer = setTimeout(() =...
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