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

Placing markers on the map


The fourth feature is about placing markers on the map for the selected addresses. To implement this feature, we will:

  • Update the address model to hold the marker

  • Create a method to place a marker on the map

  • Create a method to remove an existing marker

  • Register subscribers to trigger removal of the existing markers when an address changes

  • Update the module to add a marker to the map

Let's get started by updating the address model. Open the MapsApplication module and locate the AddressModel variable. Add an observable to this model to hold the marker:

/* generic model for address */
var AddressModel = function() {
  this.marker = ko.observable();
  this.location = ko.observable();
  this.streetNumber = ko.observable();
  this.streetName = ko.observable();
  this.city = ko.observable();
  this.state = ko.observable();
  this.postCode = ko.observable();
  this.country = ko.observable();
};

Next, we will create a method that will create and place the marker on the map. This...