How to add prices in JS?

Question

JavaScript

There are multiple select s , choosing different ones so that the number changes. In short, you need to make a price counter for VDS specifications. To choose RAM, SSD, CPU and the price automatically changed. How to do this? I am a complete zero in JS.

Answer 1

If js is completely zero and you don’t want to understand, then you are on a freelance exchange, and if you want it yourself:
(example on jQuery, but you can still do it on pure js)

function sumSel() {
  var sel=[],
    sum=0;
  sel[1]=$('.sel1').val();
  sel[2]=$('.sel2').val();
  sel[3]=$('.sel3').val();
  for (var key in sel) sum+=parseInt(sel[key]);
  return sum;
}
$(document).on('change', 'select', function() {
  alert(sumSel());
})

Didn't check, but everything seems to be correct. The algorithm is simple: we create a function where we declare variables, an array for selects and a sum. We assign the values ​​of the selects to the array, loop through the array summing up the values, and return the sum.
Below we bind the function to the select event.
This is certainly not a perfect code, but how you can quickly solve your problem.

Answer 2

knockout.js - examples are googled.

Answer 3

Order on the freelance exchange. They will write in flight, for a penny.

Answer 4

For 200-300 rubles I think they will write. There's really nothing complicated. Everything is simple. You can see the documentation for how to do it yourself.