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Home > Web Development > Front End Web Development > KnockoutJS by Example
KnockoutJS by Example
KnockoutJS by Example

KnockoutJS by Example: Develop rich, interactive, and real-world web applications using knockout.js

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KnockoutJS by Example

Chapter 2. Creating a To-do List Application

In the previous chapter, we built a simple address book application and introduced the skeleton we will be using in this book to develop more complex applications. This chapter will walk you through building a more complex application, a to-do list. This application will build and enhance the concepts learned in the previous chapter.

In this chapter, you will learn how to:

  • Work with lists using observable arrays
  • Bind input elements such as text fields and dropdown to our model
  • Use the foreach flow control with templating to render a table
  • Control text using the text data binding
  • Control appearance using the css data binding
  • Use visible binding to show or hide components
  • Sort the list using the sort method of the observable arrays
  • Filter the list using the arrayFilter method of the ko.utils package
  • Use computed observables to display dynamically changing data

The to-do list application allows the user to create and manage tasks. The application...

Creating the skeleton

We need to create the skeleton before we can start building the application features. Follow the steps given to create the skeleton. You should be familiar with these steps from the previous chapter.

Create the folder structure for development by following these steps.

  1. Create the ToDoList folder. This is the main folder that houses our to-do list application.
  2. Add a WebContent folder under the ToDoList folder. This folder holds the content that gets published to the web.
  3. Add a javascript folder under the WebContent folder. As the folder name suggests, this folder will contain all our JavaScript files.
  4. Add bootstrap folder under the WebContent folder. This folder will contain the Bootstrap files.

Now that we have the folder structure in place, let's add the files to our folders by following these steps:

  1. Add the Knockout library to the javascript folder.
  2. Add the JQuery library to the javascript folder.
  3. Add Bootstrap to the bootstrap folder.
  4. Create the file todolist.js under...

Adding and viewing tasks

The first feature of our to-do application is to give the users the ability to create and view tasks. The information we need to capture about a task is the name and description. We need to add this as a model to our ToDoList module. Add the task model. It should look similar to this:

/* the task */
var task = {
  name: ko.observable(),
  description: ko.observable()
};

We need to capture the tasks in an array. Add the tasks array to the module. It should look similar to this:

/* array of tasks */
var tasks = ko.observableArray();

Tip

Observable array is an observable, which holds a JavaScript array object as the underlying data structure. You can retrieve the JavaScript array object by invoking the observable array as a function, similar to normal observables.

Now that we have defined our model, let's create an add task method in our module. This method should create a new task, based on the name and description from the task object, and add it to our tasks array...

Deleting a task

The second feature of our to-do application is to give the users the ability to delete a task. We will do this by adding an Actions column to our tasks table and providing a Delete button for each task in the Actions column. The task will be removed from the tasks array when the Delete button for that task is clicked upon.

Add the Actions column to the tasks table by adding the column header to the thead element:

<th>Actions</th>

Add this code after <th>Description</th>. Now add the column body with a button for deleting the task. The new column goes after the Description column. It should look similar to the following code:

<td><button class="btn btn-danger" data-bind="click: ToDoList.deleteTask">Delete</button></td>

The preceding code renders a button with the label, Delete, for each of the tasks in our tasks table. The click of the buttons are bound to the deleteTask method in our ToDoList module.

Let&apos...

Completing a task

The third feature of our to-do application is to give the users the ability to complete a task. We will do this by adding a Complete button for each task in the Actions column we created while implementing the delete task feature. The task will be marked as complete by highlighting the row of the tasks that are complete. The Complete button will not appear for the tasks that have been completed.

Let's start by adding a new attribute to the task in our tasks array that tracks whether the task is complete or not. We will call this attribute, status. The status will be set to new for the newly created tasks and complete for the completed tasks. Add the status attribute to the task we create and push to the tasks array. The code should look similar to this:

//add the task to the tasks array
tasks.push({
  name: task.name(),
  description: task.description(),
  status: 'new'
});

Now let's add a button to our Actions column to change the status of a task to...

Setting priority for a task

The fourth feature of our to-do application is to give the users the ability to set priority for tasks. We will do this by adding a dropdown with options for priority. The user will be able to select the appropriate priority when creating a task. The priority of the task will be displayed in a new column in our tasks table. The options for the priority will be 1, 2, and 3.

Let's start by adding the priority attribute to our task model. Open the ToDoList module in the todolist.js file and add the attribute to capture the priority of the task. This attribute must be an observable for two-way data binding to work. Your task model should look similar to this:

/* the task */
var task =   {
      name: ko.observable(),
      description: ko.observable(),
      priority: ko.observable()
    };

We also need to add this attribute to the task object we create and push to the tasks array in our addTask method. The priority attribute in the task object we create for the...

Sorting tasks by priority and name

The fifth feature of our to-do application is to give users the ability to sort our list of tasks by priority and name. We will do this by adding the buttons, which will sort the tasks when clicked upon. This feature will demonstrate the built-in sort function of Knockout.

We will use the sort function of the observable array to sort our tasks. The following is the simplest example of using the sort function:

observableArray.sort();

This will sort observableArray alphabetically. This simple sort function is ideal for arrays of strings or numbers, but for an array of objects, such as our tasks array, we need to tell the sort function how it should compare objects. To do this, we pass a function to the sort function that accepts two objects and returns either a 0, 1, or -1. It should return a 0 if the two objects are equal, 1 if the second object is smaller, and -1 if the first object is smaller. Here is an example which sorts an array of person object by their...

Creating the skeleton

We need to create the skeleton before we can start building the application features. Follow the steps given to create the skeleton. You should be familiar with these steps from the previous chapter.

Create the folder structure for development by following these steps.

  1. Create the ToDoList folder. This is the main folder that houses our to-do list application.

  2. Add a WebContent folder under the ToDoList folder. This folder holds the content that gets published to the web.

  3. Add a javascript folder under the WebContent folder. As the folder name suggests, this folder will contain all our JavaScript files.

  4. Add bootstrap folder under the WebContent folder. This folder will contain the Bootstrap files.

Now that we have the folder structure in place, let's add the files to our folders by following these steps:

  1. Add the Knockout library to the javascript folder.

  2. Add the JQuery library to the javascript folder.

  3. Add Bootstrap to the bootstrap folder.

  4. Create the file todolist.js under the...

Adding and viewing tasks

The first feature of our to-do application is to give the users the ability to create and view tasks. The information we need to capture about a task is the name and description. We need to add this as a model to our ToDoList module. Add the task model. It should look similar to this:

/* the task */
var task = {
  name: ko.observable(),
  description: ko.observable()
};

We need to capture the tasks in an array. Add the tasks array to the module. It should look similar to this:

/* array of tasks */
var tasks = ko.observableArray();

Tip

Observable array is an observable, which holds a JavaScript array object as the underlying data structure. You can retrieve the JavaScript array object by invoking the observable array as a function, similar to normal observables.

Now that we have defined our model, let's create an add task method in our module. This method should create a new task, based on the name and description from the task object, and add it to our tasks array. We...

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Description

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.

Who is this book for?

This book is intended for designers and developers who want to learn how to use Knockout to develop rich, interactive, and modular web applications. The book assumes no prior knowledge of the Knockout library but basic familiarity with HTML, CSS, and JavaScript would be helpful.

What you will learn

  • • Explore the basic concept behind the Model-View-View Model (MVVM) design pattern and how it is implemented by knockout.js
  • • Develop a modular application skeleton based on the Module Pattern that can be used as a template for your projects
  • • Use knockout.js with other libraries and APIs, such as JQuery, Bootstrap, and the Google Maps API, to give your users a richer experience
  • • Create real-world dynamic web forms to capture user information and learn how knockout.js makes it easier to capture, validate, and submit form data
  • • Develop and use dynamic UI components such as grids, tabs, master details view, and wizards
  • • Extend knockout.js to add custom extenders, binding handlers, subscribers, and observables
  • • Secure your single page application using token-based authentication
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Publication date, Length, Edition, Language, ISBN-13
Publication date : Sep 30, 2015
Length: 268 pages
Edition : 1st
Language : English
ISBN-13 : 9781785288548
Category :
Web Development
Languages :
JavaScript
Concepts :
Front End Web Development
Tools :
KnockoutJS

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Product Details

Publication date : Sep 30, 2015
Length: 268 pages
Edition : 1st
Language : English
ISBN-13 : 9781785288548
Category :
Web Development
Languages :
JavaScript
Concepts :
Front End Web Development
Tools :
KnockoutJS

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KnockoutJS by Example
KnockoutJS by Example
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Sep 2015 268 pages
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MASTERING KNOCKOUTJS
MASTERING KNOCKOUTJS
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KnockoutJS Web Development
KnockoutJS Web Development
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KnockoutJS by Example
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MASTERING KNOCKOUTJS
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Table of Contents

10 Chapters
1. Getting Started Chevron down icon Chevron up icon
1. Getting Started
Understanding the MVVM design pattern
The key features of Knockout
Understanding the module pattern and its use with Knockout
Building the address book application
Resources
Summary
2. Creating a To-do List Application Chevron down icon Chevron up icon
2. Creating a To-do List Application
Creating the skeleton
Adding and viewing tasks
Deleting a task
Completing a task
Setting priority for a task
Sorting tasks by priority and name
Viewing the number of total and completed tasks
Summary
3. Creating an Online Customer Registration Form Chevron down icon Chevron up icon
3. Creating an Online Customer Registration Form
Getting started
Capturing personal information
Capturing contact details
Capturing residential and postal addresses
Capturing credit card details
Capturing interests
Clearing the registration form
Summary
4. Adding Validation to the Customer Registration Form Chevron down icon Chevron up icon
4. Adding Validation to the Customer Registration Form
Validating the model using Knockout extenders
Validating model using the Knockout validation plugin
Summary
5. Creating a Customer Banking Portal Chevron down icon Chevron up icon
5. Creating a Customer Banking Portal
Creating the skeleton
Navigating between application features
Viewing contact details and information about the bank
Viewing accounts
Viewing transactions for an account
Viewing personal information
Summary
6. Enhancing the Customer Banking Portal Chevron down icon Chevron up icon
6. Enhancing the Customer Banking Portal
Updating personal information
Cancel updating the personal information
Validating personal information
Transferring funds between accounts
Summary
7. Securing the Customer Banking Portal Chevron down icon Chevron up icon
7. Securing the Customer Banking Portal
Authentication mechanisms
Logging in to the application
Validating the login form
Handling the authentication error
Displaying the logged in user
Logging out of the application
Summary
8. Building an Editable Products Grid with CRUD Operations Chevron down icon Chevron up icon
8. Building an Editable Products Grid with CRUD Operations
A word on REST
Installing and running the sever
Creating the skeleton
Displaying the list of products
Deleting a product
Adding a product
Updating a product
Summary
9. Using Google Maps APIs with Knockout Chevron down icon Chevron up icon
9. Using Google Maps APIs with Knockout
Creating the skeleton
Capturing address using autocomplete
Displaying address details
Rendering the map
Placing markers on the map
Displaying route between markers
Summary
Index Chevron down icon Chevron up icon
Index

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Adnan Jaswal
https://www.linkedin.com/pub/adnan-jaswal/20/a07/580
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Cancellation Policy for Published Printed Books:

You can cancel any order within 1 hour of placing the order. Simply contact customercare@packt.com with your order details or payment transaction id. If your order has already started the shipment process, we will do our best to stop it. However, if it is already on the way to you then when you receive it, you can contact us at customercare@packt.com using the returns and refund process.

Please understand that Packt Publishing cannot provide refunds or cancel any order except for the cases described in our Return Policy (i.e. Packt Publishing agrees to replace your printed book because it arrives damaged or material defect in book), Packt Publishing will not accept returns.

What is your returns and refunds policy? Chevron down icon Chevron up icon

Return Policy:

We want you to be happy with your purchase from Packtpub.com. We will not hassle you with returning print books to us. If the print book you receive from us is incorrect, damaged, doesn't work or is unacceptably late, please contact Customer Relations Team on customercare@packt.com with the order number and issue details as explained below:

  1. If you ordered (eBook, Video or Print Book) incorrectly or accidentally, please contact Customer Relations Team on customercare@packt.com within one hour of placing the order and we will replace/refund you the item cost.
  2. Sadly, if your eBook or Video file is faulty or a fault occurs during the eBook or Video being made available to you, i.e. during download then you should contact Customer Relations Team within 14 days of purchase on customercare@packt.com who will be able to resolve this issue for you.
  3. You will have a choice of replacement or refund of the problem items.(damaged, defective or incorrect)
  4. Once Customer Care Team confirms that you will be refunded, you should receive the refund within 10 to 12 working days.
  5. If you are only requesting a refund of one book from a multiple order, then we will refund you the appropriate single item.
  6. Where the items were shipped under a free shipping offer, there will be no shipping costs to refund.

On the off chance your printed book arrives damaged, with book material defect, contact our Customer Relation Team on customercare@packt.com within 14 days of receipt of the book with appropriate evidence of damage and we will work with you to secure a replacement copy, if necessary. Please note that each printed book you order from us is individually made by Packt's professional book-printing partner which is on a print-on-demand basis.

What tax is charged? Chevron down icon Chevron up icon

Currently, no tax is charged on the purchase of any print book (subject to change based on the laws and regulations). A localized VAT fee is charged only to our European and UK customers on eBooks, Video and subscriptions that they buy. GST is charged to Indian customers for eBooks and video purchases.

What payment methods can I use? Chevron down icon Chevron up icon

You can pay with the following card types:

  1. Visa Debit
  2. Visa Credit
  3. MasterCard
  4. PayPal
What is the delivery time and cost of print books? Chevron down icon Chevron up icon

Shipping Details

USA:

'

Economy: Delivery to most addresses in the US within 10-15 business days

Premium: Trackable Delivery to most addresses in the US within 3-8 business days

UK:

Economy: Delivery to most addresses in the U.K. within 7-9 business days.
Shipments are not trackable

Premium: Trackable delivery to most addresses in the U.K. within 3-4 business days!
Add one extra business day for deliveries to Northern Ireland and Scottish Highlands and islands

EU:

Premium: Trackable delivery to most EU destinations within 4-9 business days.

Australia:

Economy: Can deliver to P. O. Boxes and private residences.
Trackable service with delivery to addresses in Australia only.
Delivery time ranges from 7-9 business days for VIC and 8-10 business days for Interstate metro
Delivery time is up to 15 business days for remote areas of WA, NT & QLD.

Premium: Delivery to addresses in Australia only
Trackable delivery to most P. O. Boxes and private residences in Australia within 4-5 days based on the distance to a destination following dispatch.

India:

Premium: Delivery to most Indian addresses within 5-6 business days

Rest of the World:

Premium: Countries in the American continent: Trackable delivery to most countries within 4-7 business days

Asia:

Premium: Delivery to most Asian addresses within 5-9 business days

Disclaimer:
All orders received before 5 PM U.K time would start printing from the next business day. So the estimated delivery times start from the next day as well. Orders received after 5 PM U.K time (in our internal systems) on a business day or anytime on the weekend will begin printing the second to next business day. For example, an order placed at 11 AM today will begin printing tomorrow, whereas an order placed at 9 PM tonight will begin printing the day after tomorrow.


Unfortunately, due to several restrictions, we are unable to ship to the following countries:

  1. Afghanistan
  2. American Samoa
  3. Belarus
  4. Brunei Darussalam
  5. Central African Republic
  6. The Democratic Republic of Congo
  7. Eritrea
  8. Guinea-bissau
  9. Iran
  10. Lebanon
  11. Libiya Arab Jamahriya
  12. Somalia
  13. Sudan
  14. Russian Federation
  15. Syrian Arab Republic
  16. Ukraine
  17. Venezuela
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