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PHP Ajax Cookbook

By : Milan Sedliak

4 (5)

PHP Ajax Cookbook

4 (5)

By: Milan Sedliak

Overview of this book

This book contains a collection of recipes with step-by-step directions to build SEO-friendly websites using standard Ajax tools. Each recipe contains behind-the-scene explanations to PHP Ajax questions. This book is an ideal resource for people who like to add Ajax features to websites and who prefer standards and best practices for building SEO-friendly websites. As the book covers advanced topics, readers need to be aware of basic PHP, JavaScript and XML features.

PHP Ajax Cookbook

PHP Ajax Cookbook

Credits

Credits

About the Authors

About the Authors

About the Reviewers

About the Reviewers

www.PacktPub.com

www.PacktPub.com

Preface

Preface

Free Chapter

AJAX Libraries

AJAX Libraries

Designing simple navigation using jQuery

Creating tab navigation

Designing components using Ext JS

Event handling in MochiKit

Building a tab navigation using Dojo

Building a chart application using YUI library

Loading dynamic content using jQuery slider

Creating an AJAX shopping cart using MooTools

Building an AJAX login form using prototype.js

Basic Utilities

Basic Utilities

Validating a form using Ajax

Creating an autosuggest control

Making Form Wizards

Uploading a file using Ajax

Uploading multiple files using Ajax

Creating a five-star rating system

Building a PHP Ajax contact form with validation

Displaying a table in Ajax

Building Pagination using PHP and Ajax

Useful Tools Using jQuery

Useful Tools Using jQuery

Making tool tips using Ajax

Creating Autocomplete from a database

Building a tab navigation using jQuery

Rotating content

Creating an image slider

Creating pageless pagination

Loading images using Lightbox

Growing textarea using the jGrow plugin

HTML replacement of the select dropdown

Improving date selection with Datepicker

Drag-and-drop functionality

Ajax shopping cart

Sorting and filtering data

Adding visual effects and animations

Advanced Utilities

Advanced Utilities

Building an Ajax chat system using the Comet technique

Charting with JavaScript

Decoding CAPTCHA through canvas

Displaying data in a grid

Debugging and Troubleshooting

Debugging and Troubleshooting

Debugging with Firebug and FirePHP

Debugging with the IE developer toolbar

Avoiding the framework $ conflict

Using the anonymous function of JavaScript

Fixing memory leaks in JavaScript

Fixing memory leaks

Sequencing Ajax Requests

Cross Browser and Ajax

Beautifying JavaScript

Optimization

Optimization

Caching of objects

Getting optimization tips with YSlow

Speeding up JavaScript delivery through automatic compression and browser caching

Triggering JavaScript early/on DOM load

Lazy-loading of images

Optimizing Ajax applications automagically through Apache modules/Google mod_pagespeed

Implementing Best Practices to Build Ajax Websites

Implementing Best Practices to Build Ajax Websites

Avoiding HTML markup-specific coding

Building secure Ajax websites

Building SEO-friendly Ajax websites

Preserving browser history or un-breaking the browser's back button

Implementing comet PHP and Ajax

Ajax Mashups

Ajax Mashups

Web services

XML-RPC

Creating and consuming web services using PHP

Using Flickr API with Ajax

Using Twitter API with Ajax

Translating text using Google Ajax API

Using Google Maps

Searching a location within a Google Map

Searching within XX km. radius of Google Maps with markers and Info window

Finding a city/country using IP address

Converting currencies using Ajax and PHP

iPhone and Ajax

iPhone and Ajax

Building a touch version of a website (with jQTouch)

Leveraging HTML5 features in iPhone Ajax

Building native apps with PhoneGap

Speeding up a PhoneGap project

Building a currency conversion hybrid app

Index

Index

Sequencing Ajax Requests

As the name suggests, Ajax is asynchronous, so the sequence of code might not be followed, as most of the logical activities are done when the HTTP request is completed.

How to do it ...

Let's try to understand the Ajax request with an example:

$(document).ready(function()
{  
    $.ajax({
    type: "POST",
    url: "test.php",
    data:'json',
    data: "bar=foo",
    success: function(msg){
    console.log('first log');
    }
  });
   
  console.log('second log')
   
});

Once executed, the preceding code is seen as follows in the Firebug console:

How it works...

Although the $.ajax function is called first, due to the asynchronous nature of the code, the second log is printed first (as this line of code follows directly after the $.ajax function). Then, success: function gets executed when the HTTP request is completed and, after that, first log gets printed to console.

Sequencing Ajax requests is a technique that is widely used in real-time applications. In the following...

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