Twitter bootstrap 3 Modal with knockout

bootstrap modal provided events, you just need to hook up event ‘hidden.bs.modal’.

BTW, do proper disposal too.
http://jsfiddle.net/C8w8v/377/

ko.bindingHandlers.modal = {
    init: function (element, valueAccessor) {
        $(element).modal({
            show: false
        });

        var value = valueAccessor();
        if (ko.isObservable(value)) {
            // Update 28/02/2018
            // Thank @HeyJude for fixing a bug on
            // double "hide.bs.modal" event firing.
            // Use "hidden.bs.modal" event to avoid
            // bootstrap running internal modal.hide() twice.
            $(element).on('hidden.bs.modal', function() {
               value(false);
            });
        }

        // Update 13/07/2016
        // based on @Richard's finding,
        // don't need to destroy modal explicitly in latest bootstrap.
        // modal('destroy') doesn't exist in latest bootstrap.
        // ko.utils.domNodeDisposal.addDisposeCallback(element, function () {
        //    $(element).modal("destroy");
        // });

    },
    update: function (element, valueAccessor) {
        var value = valueAccessor();
        if (ko.utils.unwrapObservable(value)) {
            $(element).modal('show');
        } else {
            $(element).modal('hide');
        }
    }
}