ardon-compound/calculate.js

"use strict";
//Licensed under the Apache License 2.0. See license file for information.
// Ardon Compound Interest Calculator v1.0.0 Alpha
// Written by Josh Mudge
// Ad Mejorem Dei Glorium

function calculate() {
  var numReg = /^\d+$/;
  var final = 0;
  var i = 0;

  // Get user input

  var amount = document.getElementById("amount").value;
  var time = document.getElementById("time").value;
  var rate = document.getElementById("rate").value;
  var contribution = document.getElementById("contribution").value;

  if (amount.match(numReg))
  {
    //Do nothing.
  }
  else
  {
    //Tells them to enter only numbers.

    alert("Please enter only numbers in this field.");
  }

  var rate = rate * 0.01
  console.log(rate)
  var interest = amount * rate
  console.log(interest)
  var final = amount;

  for (i = 0; i < time; i++) {
      var final = +final + (+final * +rate)
      console.log(final)
}
console.log("Test")
console.log(final)

  //Show result
  alert("You final investment amount is $" + final);
  document.getElementById("interest").innerHTML = "Your final investment amount is $" + final;

}