JSFiddle - React, Tailwind, and code Playground

HTML

<script src="http://cloud.github.com/downloads/SteveSanderson/knockout/knockout-1.2.1.debug.js"></script>
<p> 
    <input type='checkbox' data-bind="checked: hasCellphone" /> 
    I have a cellphone 
</p> 
<p> 
    Your cellphone number: 
    <input type='text' data-bind="value: cellphoneNumber, enable: 
hasCellphone" /> 
    
    <a href="#" data-bind="enable: hasCellphone"> AAA</a>
</p>

JavaScript

var viewModel = { 
    hasCellphone : ko.observable(false), 
    cellphoneNumber: "" 
};

$(function () {
    ko.applyBindings(viewModel);
});