Math

Description

HTML

<script src="//cdnjs.cloudflare.com/ajax/libs/knockout/3.1.0/knockout-min.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/knockout.mapping/2.4.1/knockout.mapping.js"></script>
<div data-bind="text: popIncrease"></div>
<input type="text" data-bind="value: userInput,  valueUpdate: 'afterkeydown'" />

JavaScript

var ViewModel = function () {
    var _self = this;
    _self.userInput = ko.observable();
    //   _self.population = ko.observable(54556239);

    _self.popIncrease = ko.computed(function () {
      
            return parseFloat((Math.floor(_self.userInput() * 100) / 100)).toFixed(2);
        

    });
};

ko.applyBindings(new ViewModel());