<h1 data-bind="text: city"> </h1>
<p data-bind="with: coords">
Latitude: <span data-bind="text: latitude"> </span>,
Longitude: <span data-bind="text: longitude"> </span>
</p>
<script type="text/javascript">
ko.applyBindings({
city: "London",
coords: {
latitude: 51.5001524,
longitude: -0.1262362
}
});
</script>

<form data-bind="submit: getTweets">
Twitter account:
<input data-bind="value: twitterName" />
<button type="submit">Get tweets</button>
</form>
<div data-bind="with: resultData">
<h3>Recent tweets fetched at <span data-bind="text: retrievalDate"> </span></h3>
<ol data-bind="foreach: topTweets">
<li data-bind="text: text"></li>
</ol>
<button data-bind="click: $parent.clearResults">Clear tweets</button>
</div>

function AppViewModel() {
var self = this;
self.twitterName = ko.observable('@example');
self.resultData = ko.observable(); // No initial value
self.getTweets = function() {
var name = self.twitterName(),
simulatedResults = [
{ text: name + ' What a nice day.' },
{ text: name + ' Building some cool apps.' },
{ text: name + ' Just saw a famous celebrity eating lard. Yum.' }
];
self.resultData({ retrievalDate: new Date(), topTweets: simulatedResults });
}
self.clearResults = function() {
self.resultData(undefined);
}
}
ko.applyBindings(new AppViewModel());

<ul>
<li>Header element</li>
<!-- ko with: outboundFlight -->
...
<!-- /ko -->
<!-- ko with: inboundFlight -->
...
<!-- /ko -->
</ul>