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- Herausgeber: Packt Publishing
- Kategorie: Fachliteratur
- Sprache: Englisch
PhantomJS is a headless WebKit browser with JavaScript API that allows you to create new ways to automate web testing. PhantomJS is currently being used by a large number of users to help them integrate headless web testing into their development processes. It also gives you developers a new framework to create web-based applications, from simple web manipulation to performance measurement and monitoring.A step step-by by-step guide that will help you develop new tools for solving web and testing problems in an effective and quick way. The book will teach you how to use and maximize PhantomJS to develop new tools for web scrapping, web performance measurement and monitoring, and headless web testing. This book will help you understand PhantomJS’ scripting API capabilities and strengths.This book starts by looking at PhantomJS’ JavaScript API, features, and basic execution of scripts. Throughout the book, you will learn details to help you write scripts to manipulate web documents and fully create a web scrapping tool.Through its practical approach, this book strives to teach you by example, where each chapter focuses on the common and practical usage of PhantomJS, and how to extract meaningful information from the web and other services.By the end of the book, you will have acquired the skills to enable you to use PhantomJS for web testing, as well as learning the basics of Jasmine, and how it can be used with PhantomJS.
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Seitenzahl: 133
Veröffentlichungsjahr: 2013
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Table of Contents
Getting Started with PhantomJS
Getting Started with PhantomJS
Copyright © 2013 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: November 2013
Production Reference: 1191113
Published by Packt Publishing Ltd.
Livery Place
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Birmingham B3 2PB, UK.
ISBN 978-1-78216-422-7
www.packtpub.com
Cover Image by Abhishek Pandey (<[email protected]>)
Credits
Author
Aries Beltran
Reviewers
Phil Sales
Stéphane Wirtel
Acquisition Editors
Owen Roberts
Martin Bell
Commissioning Editor
Sruthi Kutty
Technical Editors
Menza Mathew
Amit Shetty
Copy Editors
Sarang Chari
Tanvi Gaitonde
Insiya Morbiwala
Alfida Paiva
Lavina Pereira
Project Coordinator
Joel Goveya
Proofreader
Lauren Harkins
Indexer
Tejal Soni
Production Coordinator
Nitesh Thakur
Cover Work
Nitesh Thakur
About the Author
Aries Beltran is a software developer located in Manila, Philippines. He works as an architect and R&D developer for financial businesses using web and enterprise technologies. He is currently developing new tools to provide real-time insights. He is interested in playing around with cutting-edge HTML5 development and mobile visualization. When he isn't coding, he likes to take photos of his daughter, Tara, who is his favorite model.
I would like to thank my family, Cecille and Tara, for inspiring me always and giving me courage to aim higher. I would also like to thank Phil Sales for helping me in every aspect of this book. Lastly, I would like to thank all of the people that I work with at Packt Publishing, who are very supportive and understanding.
About the Reviewers
Phil Sales is a software development manager and has worked in this role for more than 10 years. He started and managed development and testing teams for various companies, mostly in the banking sector. Most of his projects have been web application oriented, with a Java/J2EE flavor. His latest endeavor involved starting up a Manila office for a UK-based software vendor, with development, testing, and support teams. Based in Manila, he has also worked on projects in the US, the UK, and Thailand.
Stéphane Wirtel has been one of the main developers of the OpenERP project for the past six years. He is also a consultant for the high availability of OpenERP and for the SaaS architecture of OpenERP. He has been an enthusiastic developer and user of Linux for the past 15 years and has been working on Python for 10 years. He likes to discover new technologies (LLVM, Erlang, Golang, and so on).
He is also a member of the Python Software Foundation and a former member of the Association for Computing Machinery and the GNOME Foundation.
I would like to thank my wife, Anne and my daughter, Margaux.
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Preface
PhantomJS is a fully scriptable headless browser. When I started using it two years ago, I thought it was just another environment that can perform and evaluate JavaScript, but, as I explored its features, to my surprise, I found it to be an awesome technology. Most of the features that are discussed in this book come from the bits and pieces of the application that I have been using in my work to create a web monitoring and user-simulation type of service. PhantomJS is one of those technologies that can be integrated into any existing platform and can solve web development puzzles, ranging from page manipulation to user event simulation.
This book is a guide to help you not only ease your way into developing scripts in PhantomJS but it will also show you the cool features of this technology. In addition, it will also encourage you to be more creative and play with it as each chapter unfolds new capabilities. This book will help you get started.
What this book covers
Chapter 1, Getting Started, starts by introducing what PhantomJS is, how to get and install it, and then goes directly into creating your very first script.
Chapter 2, Manipulating Page Content, shows you how to directly interact with pages that we open in our headless browser.
Chapter 3, Handling Events and Callbacks, explores how to capture events that web pages generate for the browser and reacts accordingly. We will also simulate browser events that involve simulating the users' mouse and keyboard events.
Chapter 4, Capturing Errors, focuses on how to handle errors within PhantomJS and those that are generated by the pages.
Chapter 5, Grabbing Pages, plays with one cool feature of PhantomJS, that is, capturing screenshots programmatically.
Chapter 6, Accessing Location-based Services, focuses on using existing web-based and location-based services. Using PhantomJS as our headless browser, we will be capturing location data and creating examples that are useful.
Chapter 7, Working with Files, shows you how to work with files and understand how these are supported by PhantomJS using its own FileSystem API.
Chapter 8, Cookies, discusses how cookies are supported by PhantomJS. We will learn to create cookies and interact with the pages that need them.
Chapter 9, External JavaScript, addresses the subject of working with external JavaScripts and shows how we can create PhantomJS modules that can be re-used in every script.
Chapter 10, Testing with PhantomJS, focuses on the use of PhantomJS for testing. We will learn how to use Jasmine, create test scripts, and make them work using PhantomJS.
Chapter 11, Maximizing PhantomJS, goes over the different products that are written using PhantomJS and shows how we can go beyond what we've learned from the books to make our own applications.
What you need for this book
You will need a Windows, Mac OS, or a Linux-based environment where you can develop and work with the examples given in this book. You will definitely need PhantomJS binaries, which will be discussed in Chapter 1, Getting Started, where we will learn how to get and install them.
Who this book is for
This book is intended for those who are interested in developing cool scripts and having fun at the same time, using JavaScript and PhantomJS. If you are a complete novice in JavaScript, this is not the book for you. You should also have working knowledge of HTML and CSS, but you don't need to be an advanced user.
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Chapter 1. Getting Started
PhantomJS is a new solution that provides headless testing of web applications. It is also a tool for dynamically capturing and rendering pages as images. It allows you to programmatically manipulate page content to control and change it to different forms. It can scrape websites and save important information to files. It will also provide you network-level information of your page and site resources. These are just a few of the functions that PhantomJS can do for us. It provides a fresh and a whole new way for web designers, testers, and developers to perform and create browser-based solutions.
PhantomJS uses QtWebKit as its core browser capability and uses the WebKit JavaScript engine for script interpretation and execution. Anything and everything that you can do in a WebKit-based browser (such as Chrome, Safari, and Opera browser) you can do with PhantomJS. It's more than just a browser because it supports web standards, such as CSS selector, DOM manipulation, JSON, HTML5 Canvas, and SVG; moreover, you can do some cool stuff such as performing file system I/O, accessing system environment variables, or even instantiating your own implementation of a web server daemon.
Downloading PhantomJS
Before we go through the features of PhantomJS, first we need to get our copy of the PhantomJS binaries. Typically, PhantomJS provides downloadable releases of binaries that are precompiled and packaged. You can choose from Linux, Mac OS X, and Windows precompiled packages. To download a copy, go to http://www.phantomjs.org/download.html.
Download your binaries based on your preference of operating system. After downloading, extract the binaries to any folder you desire. That's it! Your PhantomJS binary is ready to be used.
Tip
Add PhantomJS to PATH
Add the /bin folder of PhantomJS into your $PATH OS to make it easier when calling PhantomJS main binary. This allows us to call the binary anywhere without specifying the full path.
