JavaScript for Modern Web Development Building a Web Application Using HTML, CSS, and JavaScript by Alok Ranjan Abhilasha Sinha Ranjit Battewad FIRST EDITION 2020 Copyright © BPB Publications, India ISBN: 978-93-89328-721 All Rights Reserved. No part of this publication may be reproduced or distributed in any form or by any means or stored in a database or retrieval system, without the prior written permission of the publisher with the exception to the program listings which may be entered, stored and executed in a computer system, but they can not be reproduced by the means of publication. LIMITS OF LIABILITY AND DISCLAIMER OF WARRANTY The information contained in this book is true to correct and the best of author’s & publisher’s knowledge. The author has made every effort to ensure the accuracy of these publications, but cannot be held responsible for any loss or damage arising from any information in this book. All trademarks referred to in the book are acknowledged as properties of their respective owners. Distributors: BPB PUBLICATIONS 20, Ansari Road, Darya Ganj New Delhi-110002 Ph: 23254990/23254991 MICRO MEDIA Shop No. 5, Mahendra Chambers, 150 DN Rd. Next to Capital Cinema, V.T. (C.S.T.) Station, MUMBAI-400 001 Ph: 22078296/22078297 DECCAN AGENCIES 4-3-329, Bank Street, Hyderabad-500195 Ph: 24756967/24756400 BPB BOOK CENTRE 376 Old Lajpat Rai Market, Delhi-110006 Ph: 23861747 Published by Manish Jain for BPB Publications, 20 Ansari Road, Darya Ganj, New Delhi-110002 and Printed by him at Repro India Ltd, Mumbai Dedicated to Our Parents who gave us roots to stay grounded and wings to fly high Late Shri Arun Kumar Thakur and Smt. Nilu Thakur Shri Ajit Kumar and Smt. Usha Sinha Shri Narayan Battewad and Late Smt. Suwarna Battewad About the Authors Alok Ranjan is a B.Tech in Computer Science and Engineering from IIT Delhi. After graduating in 2001, Alok worked with companies like Newgen, Virtusa, and Convergys before starting his entrepreneurial journey. He co- founded an IT Services Company, Walking Tree, in 2008, which specializes in cross-platform web/mobile application development, digital transformation and data-driven decisions. He has been involved in defining and shaping technology products which have had a meaningful and measurable impact. When he is not working with customers, he spends time exploring technologies and building team. Useful Links: https://www.linkedin.com/in/alok-ranjan-b36a103/ https://walkingtree.tech/author/wtalok/ https://github.com/wtcalok Abhilasha Sinha is BE Computer Science from Osmania University. After completing her graduation in 2003, she started her career as a Software Engineer with Infosys. She went on to be Senior Technology Architect in a long and fulfilling association of 12 years. She started as a Java developer, later moved to Oracle applications and also worked on middleware technologies like BPEL and OSB. She joined Walking Tree in 2016, where she continues to explore new technologies and deliver end-to-end custom web applications for enterprises using the latest technologies and frameworks like React.js, Angular and Node.js. She is also involved in training in Modern Web Frameworks like React and Angular. When not exploring something new, the mother of two boys loves spending time with her family. Useful Links: https://www.linkedin.com/in/abhilasha-sinha-0b795020/ https://skillgaze.com/ https://walkingtree.tech/author/abhilasha-sinha/ Ranjit Battewad has 9+ years of full-stack web and mobile application development experience. Associated with WalkingTree Technologies from last 8+ years and playing the role of a senior technical lead, he has exposure to complex application architecture design and development. His core expertise areas are Ext JS, Sencha Touch, HTML, CSS, JavaScript, NodeJS, MongoDB, PostgreSQL, Blockchain - Ethereum, Cordova, ReactJS, Java. He has proven skills in developing and providing simple solutions for high complexity applications & development problems. He has a strong knowledge of databases, such as PostgreSQL and MySQL and is responsible for the complete life cycle of the project with exceptional project and team management skills. Useful Links: https://www.linkedin.com/in/ranjitbattewad/ https://walkingtree.tech/author/branjit/ https://github.com/ranjit-battewad About the Reviewers Suhail Abdul Rehman Chougule, Developed AI/ML Application, Linux, IBM Power AI Servers, Web Services, Apache Axis2 1.2, SOAP, Django, MS SQL Server, Ajax, Html, Multithreading,, LDAP (OpenDS), MySQL, CSS, Object-Oriented JavaScript, jQuery, jQuery UI, SVN, Circle CI (For Continuous Integration), Bugzilla, SSH. He Leads a team of 14 developers to develop and launch the AI-based Clinical App called Doctor App. Doctor App is a Web application and was implemented using MVC architectural pattern. Suhail Abdul Rehman Chougule, Designed and implemented UAE based entities BI (Business Intelligence) dashboard which used Angular JS, Django, backend MS SQL Server deployed on CISCO Servers. He Evaluated new technologies. Added jQuery and jQuery UI as new technologies to be used in different projects. He Implemented a large part of the UI dynamic functionalities using CSS, jQuery, jQuery UI, Ajax, JSON, and XML. He Developed back end and front-end parts of Doctor App. Acknowledgements First and foremost, we would like to thank the Almighty for giving us the strength and capability to contribute to the field of knowledge. We would like to thank everyone at BPB Publications for giving us the opportunity to publish this book. We would like to thank our parents and spouse for all the support system, so we were able to focus on the book, besides our regular work. Special mention to our children Aayush, Akshar and Vaidik - their energy, positivity and curiosity, brightens our days and inspires us to keep going always. Last but not least, we would like to thank Pradeep, Suman and the entire team of Walking Tree Technologies for all their timely support. – Alok Ranjan – Abhilasha Sinha – Ranjit Battewad