knockoutjs：Example 1: hasfocusの基本型：hasfocus binding

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<title>knockoutjs：Example 1: hasfocusの基本型：hasfocus binding</title>
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<h1>knockoutjs：Example 1: hasfocusの基本型：hasfocus binding</h1>
<input data-bind="hasfocus: isSelected" />
<button data-bind="click: setIsSelected">Focus programmatically</button>
<span data-bind="visible: isSelected">The textbox has focus</span>
<script type="text/javascript">
var viewModel = {
isSelected: ko.observable(false),
setIsSelected: function() { this.isSelected(true) }
};
ko.applyBindings(viewModel);
</script>
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