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- Herausgeber: Packt Publishing
- Kategorie: Wissenschaft und neue Technologien
- Sprache: Englisch
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!
Das E-Book können Sie in Legimi-Apps oder einer beliebigen App lesen, die das folgende Format unterstützen:
Seitenzahl: 319
Veröffentlichungsjahr: 2010
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Table of Contents
PHP jQuery Cookbook
PHP jQuery Cookbook
Copyright © 2010 Packt Publishing
All rights reserved. No part of this book may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, without the prior written permission of the publisher, except in the case of brief quotations embedded in critical articles or reviews.
Every effort has been made in the preparation of this book to ensure the accuracy of the information presented. However, the information contained in this book is sold without warranty, either express or implied. Neither the author, nor Packt Publishing, and its dealers and distributors will be held liable for any damages caused or alleged to be caused directly or indirectly by this book.
Packt Publishing has endeavored to provide trademark information about all of the companies and products mentioned in this book by the appropriate use of capitals. However, Packt Publishing cannot guarantee the accuracy of this information.
First published: December 2010
Production Reference: 1081210
Published by Packt Publishing Ltd.
32 Lincoln Road
Olton
Birmingham, B27 6PA, UK.
ISBN 978-1-849512-74-9
www.packtpub.com
Cover Image by Vinayak Chittar ( <[email protected] >)
Credits
Author
Vijay Joshi
Reviewers
Anis Ahmad
Md. Mahmud Ahsan
Joe Wu
Shameemah Kurzawa
Acquisition Editor
Chaitanya Apte
Development Editor
Neha Mallik
Technical Editors
Mohd. Sahil
Hithesh Uchil
Editorial Team Leader
Aanchal Kumar
Project Team Leader
Ashwin Shetty
Project Coordinator
Michelle Quadros
Proofreader
Mario Cecere
Indexer
Hemangini Bari
Production Coordinator
Aparna Bhagat
Cover Work
Aparna Bhagat
About the Author
Vijay Joshi is a programmer with over six years of experience on various platforms. He discovered his passion for open source four years ago when he started playing with PHP on a hobby project after completing his Masters in Computer Applications. Vijay is a professional web developer now and prefers writing code ONLY in open source (but that does not always happen, unfortunately!). He switches hats as needed—he is full-time lead programmer at Philogy, independent consultant for a few selected companies where he advises them on a variety of Internet-based initiatives, and still remains an active blogger at http://vijayjoshi.org.
Besides his work, he enjoys reading, trekking, and sometimes getting obsessed with fitness.
Writing a book is a long and complicated task which requires the support and coordination of many people. I am thankful to the entire team at Packt, especially Michelle, Chaitanya, and Neha for being so cooperative and patient with me.
This book is dedicated to all open source developers, contributors, and enthusiasts around the world who have made PHP and jQuery the leading programming tools in their niche. A big thank you to you guys. I am feeling both proud and excited to be able to contribute to the community that gave me so much to learn.
On a personal note, I would like to thank my parents, my brother Ajay, and Sheethal for their support and encouragement.
A special thanks to Ravindra Vikram Singh for helping me get started on this project.
About the Reviewers
Md. Mahmud Ahsan graduated in Computer Science & Engineering from the International Islamic University Chittagong (IIUC) in Bangladesh. He is a Zend Certified Engineer and expert in developing web applications, Facebook applications, Mashup applications, and iPhone-native applications. Besides his full time job, he blogs at http://thinkdiff.net and writes articles on different technologies, especially Facebook applications development. He lives in Bangladesh with his wife Jinat.
Currently, Mahmud works as a Software Engineer (remote developer) in i2we inc. (867 Avalon, Lafayette, CA) where he develops social web applications using PHP, MySQL, JavaScript, Zend Framework, CodeIgniter, jQuery, and Mashup APIs. He also leads various small to medium level projects.
Mahmud is also an Indie iPhone application developer and publishes his own applications at http://ithinkdiff.net.
He was a technical reviewer of the Zend Framework 1.8 Web Application Development book by Packt Publishing.
I’m very grateful to my father who bought a computer for me in 2001. Since then, I have loved programming and working with various technologies.
Joe Wu is a full-time Senior PHP Web Developer, and has been in the industry since 2005. He has worked on various projects of all sizes and is familiar with most of the open source technologies surrounding PHP web development.
Joe is always enthusiastic about new and upcoming technologies and is keen to learn and pick up new skill-sets wherever possible and utilize them in his current or future projects. He is also keen to learn about new opportunities and innovative ideas out there, and believes that the market is always wide open for new and upcoming innovations to improve our way of living.
Aside from all the technological computer work, Joe is a professional badminton player and manages to somehow fit a near full-time training schedule together with his full-time job. Joe's best ranking of 59th in the world in singles and the attendance of the Commonwealth Games Delhi 2010 means that he has equally as much experience in badminton and web developing.
Aside from all the endeavors, Joe also works for his own company (with his business partner) to put his skills and experience to good use and to help anyone who needs assistance with web development.
Wackyinnovation (www.wackyinnovation.com) promotes the concept of always moving forward and coming up with and utilizing new technologies and ideas. Their always enthusiastic and can-do attitude ensures jobs are done to perfection with an innovative edge on their competitors.
Shameemah Kurzawa has been programming since she was at high school. Being motivated to be a Systems Analyst, she pursued both undergraduate and postgraduate studies in Business Information System and Software Engineering, respectively.
She has been working as a Web Developer/Analyst for the past five years, for a renowned company SBS (Special Broadcasting Service) in Australia. Besides work, she enjoys spending her time with her family (she is the mum of a little two year old baby boy) and enjoys travelling as well as investigating new technologies.
I would like to thank my husband, my son, and the Packt Publishing team for their support and understanding in reviewing this book.
www.PacktPub.com
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Preface
Nowadays, web applications are behaving more and more like desktop applications with lesser page loads and more user interaction and effects. The Web has become faster and applications such as Gmail and Facebook have given a new meaning to web applications.
PHP on the server side and jQuery on the client side (browser) are a killer combination for developing interactive web applications. PHP is the leading language of choice among web developers and jQuery is now used on more than one-third of the top 1000 sites on the internet and is the most widely-used library.
One thing that PHP and jQuery have in common is that they are easy to learn. Once you know the basics, you can promote yourself to the next level easily.
And this is what the book will do for you. It is like a toolbox having a myriad of tools inside. It will allow you to write faster web applications, which feel like desktop applications, with the help of PHP and jQuery. Whether you want to learn live validations, create plugins, drag elements, create a menu, watch videos using YouTube API, or interact with the database, just jump to the respective recipe for the solution. AJAX, a key feature of rich internet applications, is also covered in detail.
You are not required to read this book from the beginning to the end. Each recipe is independent and is like a "how to" or a mini application in itself. You can directly look for a solution to a specific problem.
I hope you will find this book useful and that it will help you to take your skills to a higher level.
What this book covers
Chapter 1, Handling Events with jQuery, helps you understand jQuery's cross-browser event handling methods. You will learn to work with keyboard and mouse events. Advanceevent handling topics, such as dragging and keyboard shortcuts are also discussed.
Chapter 2, Combining PHP and jQuery, lists several ways of sending AJAX requests using jQuery and also describes how PHP responds to such requests. This chapter also contains recipes that deal with caching of AJAX requests and error handling during AJAX requests.
Chapter 3, Working with XML Documents, explains working with XML files in PHP as well as jQuery. Recipes will describe how to read, write, and modify XMLs using DOM and SimpleXML extensions of PHP. Parsing XML with jQuery is also discussed.
Chapter 4, Working with JSON, discusses JSON in detail. You will be shown how to read and write JSON data in PHP, and also explore jQuery's inbuilt capabilities of parsing JSON.
Chapter 5, Working with Forms, deals with forms and form validations. You will learn how to validate forms for different types of data with jQuery. This will cover validating empty fields, numbers, e-mail addresses, web addresses, and much more. Server-side validation methods will also be discussed to make validations more powerful.
Chapter 6, Adding Visual Effects to Forms, extends the previous chapter and provides recipes for adding visual effects to forms. Recipes in this chapter allow you to create user-friendly forms by adding effects, such as highlighting, fading, expandable boxes, and various others.
Chapter 7, Creating Cool Navigation Menus, describes the creation of different types of menus, such as animated menus, accordions, and tabbed menus. Advanced techniques for creating tabs are also covered that will guide you in adding and removing tabs on the fly.
Chapter 8, Data Binding with PHP and jQuery, explains, in detail, how a database can be used along with PHP and jQuery. Examples included in this chapter will explain how to fetch data from the database and use it in web forms.
Chapter 9, Enhancing your Site with PHP and jQuery, teaches you some advanced techniques of PHP and jQuery. It will show how to overcome browser restrictions like cross-domain requests. You will learn to create a jQuery plugin for custom use and an endless scrolling page among other things.
Appendix, Firebug, explains the use of Firebug for debugging HTML and JavaScript in web pages. You will learn how to edit HTML and change the appearance of pages on the browser itself without switching to actual code files. You will be able to execute JavaScript directly from Firebug and further understand debugging JavaScript using this add-on.
What you need for this book
You should have Apache (or another web server), PHP (version 5.0 or above), and MySQL installed on your system to be able to run the examples in this book. You can install them all at once using software such as WampServer or you can install them separately. jQuery (version 1.3.2 or higher) will also be required.
In terms of technical proficiency, this book assumes that you have working knowledge of PHP, jQuery, HTML, and CSS. You need to know only the basics of these, leave the rest to this book.
Who this book is for
This book is for PHP and jQuery developers who just know the basics of these two and want to use PHP and jQuery together to create rich internet applications. It provides a large number of examples in each chapter that will take you from being a basic developer to a pro by giving step-by-step instructions for each task in developing web applications using PHP and jQuery.
Conventions
In this book, you will find a number of styles of text that distinguish between different kinds of information. Here are some examples of these styles, and an explanation of their meaning.
Code words in text are shown as follows: "The input button has also been attached to a click event."
A block of code is set as follows:
New terms and important words are shown in bold. Words that you see on the screen, in menus or dialog boxes for example, appear in the text like this: "Now click on the Create New Element button a few times to create some DIV elements".
Note
Warnings or important notes appear in a box like this.
Tip
Tips and tricks appear like this.
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Tip
Downloading the example code for this book
You can download the example code files for all Packt books you have purchased from your account at http://www.PacktPub.com. If you purchased this book elsewhere, you can visit http://www.PacktPub.com/support and register to have the files e-mailed directly to you.
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Questions
You can contact us at <[email protected]> if you are having a problem with any aspect of the book, and we will do our best to address it.
Chapter 1. Handling Events with jQuery
In this chapter, we will cover:
Introduction
Events are actions that execute some JavaScript code for producing the desired result. They can be either some sort of manipulation of a document or some internal calculations.
Since different browsers handle events differently, it takes a lot of effort to write JavaScript code that is compatible with all browsers. This chapter will help you understand event handling and explore related methods of jQuery that can make scripts compatible on different browsers. You will learn to work with the keyboard and mouse events. Advanced event handling topics like dragging and keyboard shortcuts are also discussed.
Executing functions when page has loaded
AJAX applications make extensive use of JavaScript to manipulate the content and the look and feel of web pages. Web pages should have the DOM loaded before any JavaScript code tries to perform any such modification on it.
This recipe will explain how to execute the JavaScript after the content has been loaded and the DOM is ready.
Getting ready
Get a copy of the latest version of the jQuery library.
How to do it...
How it works...
jQuery ensures that code written inside .ready() gets executed only after the DOM is fully loaded. This includes the complete document tree containing the HTML, stylesheets, and other scripts. You can, therefore, manipulate the page, attach events, and do other stuff. Note that .ready() does not wait for images to load. Images can be checked using the .load() method, which is explained in a separate recipe in this chapter.
If .ready() is not used, the jQuery code does not wait for the whole document to load. Instead it will execute as it is loaded in the browser. This can throw errors if the written code tries to manipulate any HTML or CSS that has not been loaded yet.
Passing a handler to .ready()
In the previous example code we used an anonymous function with .ready(). You can also pass a handler instead of the anonymous function. It can be done as follows:
Another method of using .ready()
Instead of writing the code in the above mentioned format, we can also use one of the below described variations for finding out when the DOM is ready:
Or
Multiple .ready() methods
If there are multiple script files in your application, you can have a .ready() for each of them. jQuery will run all of these after DOM loads. An example scenario may be when you are using some plugins on a page and each one of them has a separate .js file.
Binding and unbinding elements
This recipe will demonstrate how you can attach events to DOM elements using the .bind() method and how to remove them using the .unbind() method.
Getting ready
Get a latest copy of the jQuery library to use with this recipe.
How to do it...
Clicking on the Unbindselectbox button will remove the change event handler here and the selection of a value from the combo box will now do nothing.
How it works...
jQuery uses the .bind() method to attach standard JavaScript events to elements. .bind() takes two parameters. The first parameter is the event type to attach. It is passed in string format, and event types such as click, change, keyup, keydown, focus, blur, and so on can be passed to it. The second parameter is the callback function, which will be executed when the event fires.
In the previous code, we used .bind() for the list items to attach a click handler. In the callback function, $(this) refers to the element that fired the event. We then use the .css() method to change the background color of the element that is clicked upon.
Similarly, we attached the change event to the select box using the .bind() method. The callback function will be called each time the value of the select box is changed.
The input button has also been attached to a click event. Clicking on the button calls the .unbind() method. This method accepts an event type name and removes that event from the element. Our example code will remove the change event from the select box. Therefore, changing the value of the select box will not display any further alerts.
There's more...
Binding multiple events
Multiple events can also be attached using the .bind() method. The following code attaches two events focus and blur to a textbox. Focusing on a textbox will empty it, whereas taking the focus away from it will put some text in it.
Tip
Note that this functionality was added in Version 1.4 of jQuery. So, make sure that you have the correct version before running this code.
Shortcut method for binding
Instead of using .bind(), events can be attached directly by using shortcut event names to elements. For example, $(element).click(function() { }); can be written instead of using $(element).bind('click', function() { });.
Other events can be attached similarly.
Triggering events
Events can also be triggered from the code. For this we have to pass the event name without any parameter.
The above code will execute the keydown event of element2 when element1 is clicked.
Common event types
Here is a list of some common events that can be passed to the bind() and unbind() methods.
blur
focus
load
unload
scroll
click
dblclick
mousedown
mouseup
mousemove
mouseover
mouseout
change
select
submit
keydown
keypress
keyup
Unbinding all events from an element
If no parameter is passed to the .unbind() method, it will remove all event handlers associated with the specified element.
Adding events to elements that will be created later
The .bind() method attaches events to only those elements that exist on a page. If any new elements are created that match the criteria for the .bind() method, they will not have any event handlers.
How to do it...
How it works...
The input button creates the new DIV elements and appends them to the body of a document. The secret lies in the next function. We have used jQuery's live() method to attach an event on click of a DIV element. live() behaves exactly like bind() for attaching events with only one major difference. Where bind() can add events to only existing elements on a page, live() remembers the attached event for that selector and applies it to matching elements even if they are created later and then inserted into a page.
Therefore, all new DIV elements that are created as a result of clicking on the Create NewElement button also respond to the click event handler.
Removing event handlers with die()
The die() method is similar to the unbind() method. It is used to remove event handlers that were attached using the live() method. Similar to unbind(), die() also has two variations.
If it is called with no parameters, all event handlers will be removed. Another variation accepts an event type name that will remove that particular event:
The following is the code for other variations that will remove only the specified event handler.
If an element has more than one event handler attached to it, the above code will remove only the click event handler and will leave the others intact.
See also
Submitting a form with jQuery
We know that submit buttons are used in HTML forms to submit data to a server. Apart from submit buttons, JavaScript also provides a submit method that can be used to submit forms.
In this recipe, you will learn how to submit forms the jQuery way and will also learn how the form submission can be controlled using the submit button.
Getting ready
Get the jQuery library to use with this recipe.
How to do it...
How it works...
In this example we attached the click event handler to the input button. The event handler function will execute when the button is clicked. On clicking the button, jQuery's submit() method is called on the form, which submits the form. All browsers have a native submit method to submit the form programmatically. jQuery has wrapped this functionality into its own submit() method.
