Knockoutjs.com - Click counter example

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

by ernestohs

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'> 
    
    <div>You've clicked <span data-bind='text: numberOfClicks'>&nbsp;</span> times</div> 
    
    <button data-bind='click: registerClick, enable: !hasClickedTooManyTimes()'>Click me</button> 
    
    <div data-bind='visible: hasClickedTooManyTimes'> 
        That's too many clicks! Please stop before you wear out your fingers.
        <button data-bind='click: function() { numberOfClicks(0) }'>Reset clicks</button> 
    </div> 
    
</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; }

JavaScript

var clickCounterViewModel = function() {
    this.numberOfClicks = ko.observable(0);

    this.registerClick = function() {
        this.numberOfClicks(this.numberOfClicks() + 1);
    }

    this.hasClickedTooManyTimes = ko.dependentObservable(function() {
        return this.numberOfClicks() >= 3;
    }, this);
};

ko.applyBindings(new clickCounterViewModel());