Question

I am trying to write a basic progress bar with jQuery. I got al the parts that will display the progress in percentages, just need to debug my math.

So, if I start with 130 questions, every time the question is answered I need to recalculate and show the progress.

So here’s what I do

var questID // is current question ID, from 1 to 130

var startCount = 130;
var currentCount = startCount - questID;
var progress = Math.floor(currentCount / startCount * 100);
$("#progressBar").width(progress);

I think I get something backwards as when I test I get 99% after the first question… probably need more caffeine.

Answer 1

Your currentCount logic is wrong. If you have answered 1 question then:

var currentCount = 130 - 1 = 129.

Then 129/130 will give you the 99%. You just need 1/130. Therefore you can use questID:

var questID // is current question ID, from 1 to 130

var startCount = 130;
var progress = Math.floor(questID / startCount * 100);
$("#progressBar").width(progress);