Book Image

PHP jQuery Cookbook

By : Vijay Joshi
Book Image

PHP jQuery Cookbook

By: Vijay Joshi

Overview of this book

As web technology evolves, the gap between desktop applications and web applications continues to vanish. And what better way to bridge that gap, for your own website, than using the best two open source technologies in the market: PHP and jQuery. The power-combo of these two is leading the way in revolutionizing the RIA world. Although they are easy to integrate, finding or figuring out how to do what you want to do is rather arduous.The PHP jQuery Cookbook will be your handy guide with walkthroughs of common integration tasks and problems that will help you master the possibilities available using the PHP and jQuery combo. You will learn quick solutions to necessary tasks to integrate the power of two of the best known and most widely used web technologies of today – PHP on the server side and jQuery on the client side. Glide through the basics and move to advanced topics to create dynamic and interactive web applications with this book in hand.This book covers a wide array of technical aspects of creating an interactive website. Apart from basics of PHP and jQuery, you will go through advanced topics like creating plugins, validating controls, and useful utilities that you will be able to use as stand-alone tools. AJAX, the key technique of browser-server communication is covered in detail. You will also learn to use JSON, which is becoming preferred as a mode of data interchange over XML, both in web applications and web services.The book also covers database interaction, which is an important part of any dynamic web application. You will also gain expertise in debugging JavaScript with the help of useful tools that will save you hours of tedious manual debugging.Most importantly, by using jQuery and PHP together, you will be able to develop applications that are compatible with all major browsers, with no need to write code targeted at specific browsers!
Table of Contents (17 chapters)
PHP jQuery Cookbook
Credits
About the Author
About the Reviewers
www.PacktPub.com
Preface
Index

Loading JavaScript on demand to reduce page load time


Think of a rich Internet application that makes heavy use of JavaScript to interact with the user. Such a page typically consists of more than one JavaScript files, such as a file for calendar control, another file for special effects, yet another plugin for your cool accordion, and so on.

This results in the increase of the page load time as browsers cannot download all of these files simultaneously. The best solution for this is to load only absolutely necessary files at the time of loading the page and load the other files when required.

This recipe will explain how JavaScript files can be loaded on demand.

Getting ready

Create a directory named Recipe9 in the chapter2 folder.

How to do it...

  1. Create a file index.html in the chapter2 folder. Write the HTML to create a page that will have a paragraph element and four buttons. The first button will be used to load another JavaScript file and rest of the buttons will manipulate the paragraph...