knockoutjs：Example 1: 条件によってCSS指定：The css binding

<!DOCTYPE html>
<html lang="ja">
<head>
<meta charset="UTF-8">
<title>knockoutjs：Example 1: 条件によってCSS指定：The css binding</title>
<script type="text/javascript" src="knockout-2.1.0beta.js"></script>
<style type="text/css">
.profitWarning{
color:red;
}
</style>
</head>
<body>
<h1>knockoutjs：Example 1: 条件によってCSS指定：The css binding</h1>
<div data-bind="css: { profitWarning: currentProfit() < 0 }">
Profit Information
</div>
<script type="text/javascript">
var viewModel = {
currentProfit: ko.observable(150000) // Positive value, so initially we don't apply the "profitWarning" class
};
viewModel.currentProfit(-50); // Causes the "profitWarning" class to be applied
ko.applyBindings(viewModel);
</script>
<div style="font-size:10pt;text-align:right;margin-top:0.5em;">
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</div>
<div style="font-size:10pt;text-align:center;margin-top:0.5em;padding:0.5em;border-top:1px solid #ccc;">
</div>
</body>
</html>