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knockoutjs：Example 2: 親で指定したものを子・孫に使う：The custom binding Control descendant bindings

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<title>knockoutjs：Example 2: 親で指定したものを子・孫に使う：The custom binding Control descendant bindings</title>
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<h1>Example 2: 親で指定したものを子・孫に使う：The custom binding Control descendant bindings</h1>
<div data-bind="withProperties: { emotion: 'happy' }">
Today I feel <span data-bind="text: emotion"></span>.
</div>
<div data-bind="withProperties: { emotion: 'whimsical' }">
Today I feel <span data-bind="text: emotion"></span>.
</div>
<script type="text/javascript">
ko.bindingHandlers.withProperties = {
init: function(element, valueAccessor, allBindingsAccessor, viewModel, bindingContext) {
// Make a modified binding context, with a extra properties, and apply it to descendant elements
var newProperties = valueAccessor(),
innerBindingContext = bindingContext.extend(newProperties);
ko.applyBindingsToDescendants(innerBindingContext, element);
// Also tell KO *not* to bind the descendants itself, otherwise they will be bound twice
return { controlsDescendantBindings: true };
}
};
var viewModel = {};
ko.applyBindings(viewModel);
</script>
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