Knockout binding use Numeral.js to format money. It is a requirejs module, the paths of the numeral and the knockout must be defined in the requirejs config.

knockout-numeral

define(['knockout','numeral'],function(ko,numeral){
    ko.bindingHandlers.money = {
            update: function (element, valueAccessor,allBindingsAccessor) {
            	var format = allBindingsAccessor().format || "00,000";
                var value = ko.utils.unwrapObservable(valueAccessor());
                $(element).text(numeral(value).format(format));
            }
        };
});




//for example:   <span data-bind="money: myobservable, format:'00,000' "  ></span>