I am using Knockout as a View Model to fill values of my view template, It is working fine for all except one function getConvertedTotal is returning NaN.

],function (ko, Component, urlBuilder,storage,quote) 
    'use strict';
    return Component.extend({
        defaults: {template: 'Ishaq_CheckoutTotal/custom-block-order-summary',},
        initialize: function(config) {
            var currencyRate = config.currencyRate;
            var currencySymbol = config.currencySymbol;
        getSubtotal: function() {
            var totals = quote.totals();
            return (totals ? totals : quote)['subtotal'];
        getGrandTotal: function() {
            var totals = quote.totals();
            return (totals ? totals : quote)['grand_total'] ;            
        getConvertedTotal: function() {
            var totals = quote.totals();
            var temp = (totals ? totals : quote)['grand_total'] ;
            return (temp*this.currencyRate);

2 Answers 2


This means one of your values are not a number, either temp or this.currencyRate. My guess is that this.currencyRate is not returning a number (probably undefined).

In that case you need to change:

var currencyRate = config.currencyRate


this.currencyRate = config.currencyRate

It's obvious from the code that this.currencyRate is undefined

  • Inside getConvertedTotal function unable to get value it is undefined, however inside initialize: function(config) I am able to get data using console.log
    – ishaq
    Feb 5, 2021 at 5:07
  • 1
    I really hope you spend your time to learn some basic about javascript, this will save you alot of time when learning Magento or any other framework/library
    – Jimmy
    Feb 5, 2021 at 7:37
  • 1
    @ishaq That is because your currencySymbol variable is only available within the initialize function. You need to change it to this.currencyRate = config.currencyRate
    – Ben Crook
    Feb 5, 2021 at 9:40

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