Basic Observable Example

HTML

<script src="//cdnjs.cloudflare.com/ajax/libs/knockout/2.3.0/knockout-min.js"></script>
<div>
    <label>Please enter your name:</label>
    <input type="text" data-bind="value: name" />
</div>
Welcome, <span data-bind="text: name">guest</span>!

JavaScript

var viewModel = {};
viewModel.name = ko.observable();

// viewModel.name("Mr. Falcon");

ko.applyBindings( viewModel );