Book Image

KnockoutJS by Example

By : Adnan Jaswal
Book Image

KnockoutJS by Example

By: Adnan Jaswal

Overview of this book

KnockoutJS By Example is a project-based guide that introduces the key features and concepts of knockout.js. It helps you create an application skeleton and a Hello World application. You will develop a To-Do list application that aims to show the basic features of knockout.js in action, such as data binding and observables, following which you will develop a dynamic online customer registration form that captures and validates customer information. This book will further walk you through developing a customer banking portal, which demonstrates the use of knockout.js with components such as navigation bars, tabs, carousels, master details view, panels, forms, and wizards. You will also discover how to use token-based authentication and authorization to secure the customer banking portal, and move on to creating an editable products grid with CRUD operations. Finally, you will explore how to use the Google Maps API with knockout.js. KnockoutJS By Example will not only leave you with a basic understanding of knockout.js fundamentals but also take you through some of the advanced features. It will help you get a web application up and ready instantly.
Table of Contents (17 chapters)
KnockoutJS by Example
Credits
About the Author
Acknowledgment
About the Reviewers
www.PacktPub.com
Preface
Index

Logging out of the application


In this user story, we will give the users the ability to be able to log out of the application. To implement the logout feature, we will:

  • Add a method to the authenticator module to send a logout request to the server and reload the application

  • Update the view to display the logout link

Let's start by adding a method to the authenticator module. We will name this method logout. This method should send a logout request to the server, clear the token stored in the session, and reload the application. The server invalidates the token on the logout request. Reloading the application will clear it from any data stored about the user. Add this method to the return statement of the authenticator module. Our implementation looks similar to this:

/* logout out of the application */
var logout = function() {
  server.logout(authenticationToken());
  sessionStorage.clear();
  document.location.reload(true);
};

Now we can update the view and add the logout link. We will modify...