javascript set variable conditional in initialize

Question

Simple question, but i'm stucked...

I want to set the plusmin on initialisation dependant on the defaultQty.

So is the defaultQty = 1 (of an other whole number like 2 or 3) then the plusmin has to be 1.

If it's not a whole integer (like 0.5) the plusmin has to be 0.1

define([
    'ko',
    'uiComponent'
], function (ko, Component) {
    'use strict';

    return Component.extend({
        initialize: function () {
            //initialize parent Component
            this._super();
            this.qty = ko.observable(this.defaultQty);
            this.plusmin = 0.1;
        },

        decreaseQty: function() {
            var newQty = this.qty() - this.plusmin;
            if (newQty < this.defaultQty) {
                newQty = this.defaultQty;
            }
            this.qty(newQty);
        },

        increaseQty: function() {
            var newQty = this.qty() + this.plusmin;
            this.qty(newQty);
        }

    });
});

this.plusmin = ( this.qty == Math.floor(this.qty) ) ? 1 : 0.1 — flowtron
– flowtron, Commented Nov 14, 2016 at 14:58

andi · Accepted Answer · 2016-11-14 15:00:43Z

3

this.plusmin = (this.defaultQty % 1 === 0) ? 1 : 0.1;

answered Nov 14, 2016 at 15:00

andi

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3 Comments

Jilco Tigchelaar Over a year ago

Yep! This is it! in 4 minutes i can accept the answer. But when i go to 0.8 in some way 0,7999999999999999 appears in the input field. Is there a way to (conditional) round the number to 0,8 when it is not a whole number?

andi Over a year ago

Not sure exactly what you need here. JavaScript gets funny with number precision in ways such as the above, but it shouldn't affect the answer to this question. If that's an entirely new issue, then just ask it as a new question.

Jilco Tigchelaar Over a year ago

Used var newQty = Math.round((this.qty() - this.plusmin) * 100) / 100; to do the job :-)

Rounin · Accepted Answer · 2016-11-14 15:02:13Z

0

You can use the modulus operator (%) which returns the remainder after dividing:

(defaultQty % 1) > 0 ? plusmin = 0.1 : plusmin = 1;

answered Nov 14, 2016 at 15:02

Rounin

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