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MASTERING KNOCKOUTJS

You're reading from   MASTERING KNOCKOUTJS Use and extend Knockout to deliver feature-rich, modern web applications

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Product type Paperback
Published in Nov 2014
Publisher
ISBN-13 9781783981007
Length 270 pages
Edition 1st Edition
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Author (1):
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Timothy Moran Timothy Moran
Author Profile Icon Timothy Moran
Timothy Moran
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Toc

Table of Contents (11) Chapters Close

Preface 1. Knockout Essentials 2. Extending Knockout with Custom Binding Handlers FREE CHAPTER 3. Extending Knockout with Preprocessors and Providers 4. Application Development with Components and Modules 5. Durandal – the Knockout Framework 6. Advanced Durandal 7. Best Practices 8. Plugins and Other Knockout Libraries 9. Under the Hood Index

Knockout-ES5


Knockout-ES5 is a plugin for Knockout that uses JavaScript getters and setters to hide observables behind object properties, allowing your application code to use standard syntax to work with them. Basically, it gets rid of the observable parentheses:

Take a look at the following code:

var latestOrder = this.orders()[this.orders().length - 1];
latestOrder.isShipped(true);

The preceding code becomes this:

var latestOrder = this.orders[this.orders.length - 1];
latestOrder.isShipped = true;

If you remember the Durandal observable plugin, it's very similar; they even came out around the same time. The biggest difference between the two is that Durandal's observable plugin performs deep object conversion, and Knockout ES5 performs shallow conversion.

To convert a viewmodel's properties to observables, call ko.track:

function Person(init) {
   var self = this,
      data = init || {};

   self.name = data.name || '';
   self.age = data.age || '';
self.alive = data.alive !== undefined ? data...
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