除了內建的click, value之外，
knockout.js 也可以自行建立新的綁定。

ko.bindingHandlers.slideVisible = {
    update: function(element, valueAccessor, allBindingsAccessor) {
        // First get the latest data that we're bound to
        var value = valueAccessor(), allBindings = allBindingsAccessor();
         
        // Next, whether or not the supplied model property is observable, get its current value
        var valueUnwrapped = ko.utils.unwrapObservable(value); 
         
        // Grab some more data from another binding property
        var duration = allBindings.slideDuration || 400; // 400ms is default duration unless otherwise specified
         
        // Now manipulate the DOM element
        if (valueUnwrapped == true) 
            $(element).slideDown(duration); // Make the element visible
        else
            $(element).slideUp(duration);   // Make the element invisible
    }
};




<div data-bind="slideVisible: giftWrap, slideDuration:600">You have selected the option</div>
<label><input type="checkbox" data-bind="checked: giftWrap" /> Gift wrap</label>
 
<script type="text/javascript">
    var viewModel = {
        giftWrap: ko.observable(true)
    };
    ko.applyBindings(viewModel);
</script>

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