Events

HTML

<script src="https://github.com/downloads/SteveSanderson/knockout/knockout-2.0.0.js"></script>
<script src="https://github.com/downloads/ericmbarnard/Knockout-Validation/knockout.validation.min.v0.9.js"></script>
Enter number:
<input data-bind = "value: numberValue " />

JavaScript

var viewModel = {
    numberValue: ko.observable().extend({ number: true })
}

ko.applyBindings(viewModel);