Defining JavaScript class in Knockout

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Information about Defining JavaScript class in Knockout
Technology

Published on April 23, 2014

Author: PrasannaPattam

Source: slideshare.net

Description

We all know how to write a class in traditional languages such as C#, Java etc. With more trend towards Single Page Applications we are all moving towards writing JavaScript classes. In this blog I will present my preferential way of writing a JavaScript class while using Knockout. The approach is generic enough you can use this with another framework

Defining JavaScript class in Knockout We all know how to write a class in traditional languages such as C#, Java etc. With more trend towards Single Page Applications we are all moving towards writing JavaScript classes. In this blog I will present my preferential way of writing a JavaScript class while using Knockout. The approach is generic enough you can use this with another framework Here is my typical structure: define([], function () { var title = ko.observable(); varvm = { activate: activate, title: title }; returnvm; function activate() { returntrue; } }); There are 4 sections in this structure. Here are the details of each section 1. At the top I am using AMD module loaders such as RequireJS to load all the dependencies. This is like include files. define([], function () { // Your class code }); 2. Once all the dependencies are loaded. I define all my private variables. var title = ko.observable(); 3. This is the most important piece. This section contains the public properties our javascript class exposes. This like an interface in C#. Using this we can restrict what the consumer can access our object. varvm = { activate: activate, title: title }; returnvm; As you see I am allowing consumers to access activate method and the property title. 4. In this last section we can define all our functions (both public and private)

function activate() { returntrue; } As you see with this structure you can get the feel of a traditional class in JavaScript.

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