Knockoutjs.com - Hello World Example

http://knockoutjs.com/examples/helloWorld.html

by studgeek

HTML

<script src="http://knockoutjs.com/js/jquery.tmpl.js"></script>
<script src="http://knockoutjs.com/js/knockout-1.2.1.js"></script>
<div class='liveExample'>   
    <p>First name: <input id="firstName" data-bind='value: firstName' /></p> 
    <p>Last name: <input data-bind='value: lastName' /></p> 
    <h2>Hello, <span data-bind='text: fullName'> </span>!</h2>  
</div>

CSS

body { font-family: arial; font-size: 14px; }
.liveExample { padding: 1em; background-color: #EEEEDD; border: 1px solid #CCC; max-width: 655px; }
.liveExample input { font-family: Arial; }
.liveExample b { font-weight: bold; }
.liveExample p { margin-top: 0.9em; margin-bottom: 0.9em; }
.liveExample select[multiple] { width: 100%; height: 8em; }
.liveExample h2 { margin-top: 0.4em; font-weight: bold; font-size: 1.2em; }

JavaScript

// Here's my data model
var viewModel = {
    firstName: ko.observable("Planet"),
    lastName: ko.observable("Earth")
};
viewModel.fullName = ko.dependentObservable(function() {
    // Knockout tracks dependencies automatically. It knows that fullName depends on firstName and lastName, because these get called when evaluating fullName.
    return viewModel.firstName() + " " + viewModel.lastName();
});

ko.applyBindings(viewModel); // This makes Knockout get to work

$("#firstName").change(function() {
    alert("changed!");
});