Summernote binding

ko.bindingHandlers.wysiwyg = {
    init: function (element, valueAccessor, allBindingsAccessor, viewModel, bindingContext) {
        var value = ko.unwrap(valueAccessor());
        var allBindings = ko.unwrap(allBindingsAccessor());
        var optionsBinding = allBindings.wysiwygOptions || {};
        var $element = $(element);
        var options = $.extend({}, optionsBinding);

        var updateObservable = function (e) {
            valueAccessor()($element.summernote('code'));
           return true;
        };

        options.callbacks = {};
        options.callbacks.onBlur = updateObservable;

        $element.html(value).summernote(options);
    },
    update: function (element, valueAccessor, allBindingsAccessor) {
        $(element).summernote('code', ko.utils.unwrapObservable(valueAccessor()));
    }
};