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Learning jQuery - Fourth Edition

Learning jQuery - Fourth Edition

4.2 (20)
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Learning jQuery - Fourth Edition

Learning jQuery - Fourth Edition

4.2 (20)

Overview of this book

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.
Table of Contents (24 chapters)
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Learning jQuery Fourth Edition
Credits
Foreword
About the Authors
About the Reviewers
www.PacktPub.com
Preface
Index

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:

$(document).ready(function() {
  var timer = 0;
  $(window).scroll(function() {
    if (!timer) {
      timer = setTimeout...

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