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

Rendering the map


The third feature is to about rendering the map in the view. To implement this feature, we will:

  • Retrieve user location from the browser

  • Create a custom binding handler for maps panel

  • Update the view to display the map

Let's start by creating a method to retrieve the user location form the browser. The current user location information will be used to initialize the map. We will use the getCurrentPosition method of the Geolocation class provided by the browser to get the user's current location.

Tip

The Geolocation class provides methods to obtain the location of the device. The location information can be used to provide a customized experience to the user. The API reference for Geolocation class can be found at https://developer.mozilla.org/en-US/docs/Web/API/Geolocation.

Define an attribute to hold the user's current location, call it localLocation. Initialize this attribute with your local longitude and latitude:

var localLocation = {lat: -37.810432, lng: 144.96616};

The initial...