My simple and usefull knockout binding handlers I always use

knockout.bindings.js

// Requires BlockUI
ko.bindingHandlers.blockUI = {
    update: function (element, valueAccessor, allBindings, viewModel, bindingContext) {
        var isEnabled = ko.unwrap(valueAccessor()) || false;
        if (isEnabled) {
            $(element).block();
        }
        else {
            $(element).unblock();
        }
    }
};

ko.bindingHandlers.href = {
    update: function(element, valueAccessor, allBindings, data, context) {
        ko.bindingHandlers.attr.update(element, function() {
            return { href: valueAccessor() }
        });
    }
};

// Requires accounting.js
ko.bindingHandlers.currency = {
    update: function (element, valueAccessor, allBindings) {
        ko.bindingHandlers.text.update(element, function() {
            return accounting.formatMoney(valueAccessor());
        });
    }
};

// Requires Bootstrap Switch
ko.bindingHandlers.bsSwitch = {
    init: function (element, valueAccessor, allBindings, viewModel, bindingContext) {
        $(element).on('switchChange.bootstrapSwitch', function (e, state) {
            var value = valueAccessor();
            value(state);
        });

        ko.utils.domNodeDisposal.addDisposeCallback(element, function () {
            $(element).bootstrapSwitch("destroy");
        });

        ko.bindingHandlers.checked.init(element, valueAccessor);
    },
    update: function (element, valueAccessor, allBindings, viewModel, bindingContext) {
        var currentValue = ko.unwrap(valueAccessor());
        $(element).bootstrapSwitch('state', currentValue, true);
    }
};


/*http://eonasdan.github.io/bootstrap-datetimepicker*/
ko.bindingHandlers.bsDatePicker = {
    init: function (element, valueAccessor, allBindings, viewModel, bindingContext) {
        var options = ko.unwrap(valueAccessor());
        $.extend(options, { pickTime: false });

        var dateValueObserver = allBindings().dateValue;

        $(element).datetimepicker(options);
        $(element).on('dp.change', function (e) {
            $(element).data("DateTimePicker").hide();
            dateValueObserver(moment(e.date).format(options.format));
        });

        ko.utils.domNodeDisposal.addDisposeCallback(element, function() {
            $(element).datetimepicker("destroy");
        });
    }
};

/*http://eonasdan.github.io/bootstrap-datetimepicker*/
ko.bindingHandlers.bsTimePicker = {
    init: function (element, valueAccessor, allBindings, viewModel, bindingContext) {
        var options = ko.unwrap(valueAccessor());
        $.extend(options, { pickDate: false, useStrict: true, useSeconds: false });

        var timeValueObserver = allBindings().timeValue;

        $(element).datetimepicker(options);
        $(element).on('dp.change', function (e) {
            $(element).data("DateTimePicker").hide();
            timeValueObserver(moment(e.date).format(options.format));
        });

        ko.utils.domNodeDisposal.addDisposeCallback(element, function () {
            $(element).datetimepicker("destroy");
        });
    }
};

ko.bindingHandlers.bsTooltip = {
    init: function(element, valueAccessor, allBindings, viewModel, bindingContext) {
        var local = ko.utils.unwrapObservable(valueAccessor()),
            options = {};

        ko.utils.extend(options, ko.bindingHandlers.bsTooltip.options);
        ko.utils.extend(options, local);

        $(element).tooltip(options);

        ko.utils.domNodeDisposal.addDisposeCallback(element, function () {
            $(element).tooltip("destroy");
        });
    },
    options: {
        placement: "right"
    }
};

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

        var value = valueAccessor();
        if (ko.isObservable(value)) {
            $(element).on('hide.bs.modal', function () {
                value(false);
            });
        }

        ko.utils.domNodeDisposal.addDisposeCallback(element, function () {
            $(element).modal("destroy");
        });
    },
    update: function (element, valueAccessor) {
        var show = ko.unwrap(valueAccessor());
        $(element).modal(show ? 'show' : 'hide');
    }
};