knockoutjs：Using built-in bindings：Working with form fields：selectedOptions

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<title>knockoutjs：Using built-in bindings：Working with form fields：selectedOptions</title>
<script type="text/javascript" src="jquery-1.5.1.min.js"></script>
<script type="text/javascript" src="knockout-2.1.0beta.js"></script>
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<p>
Choose some countries you'd like to visit:
<select data-bind="options: availableCountries, selectedOptions: chosenCountries" size="5" multiple="true"></select>
</p>
<script type="text/javascript">
var viewModel = {
availableCountries : ko.observableArray(['France', 'Germany', 'Spain']),
chosenCountries : ko.observableArray(['Germany']) // Initially, only Germany is selected
};
// ... then later ...
// Now France is selected too
viewModel.chosenCountries.push('France');
ko.applyBindings(viewModel);
</script>
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