Exchange Rate Project with JavaScript, HTML and CSS

In this tutorial, we will learn how to develop Exchange Rate Project with plain JavaScript, HTML, and CSS.

Exchange Rate

Select countries to get the exchange rate for a specific amount.

Project Specifications

  • Display UI with 2 select lists for countries and 2 inputs for amounts
  • Fetch exchange rates from API (https://api.exchangerate-api.com)
  • Display the values for both countries
  • Update values on amount change
  • Swap country rates

JavaScript Breakout Game Development

Create a folder called exchange-rate as the project workspace and we will create all the project files inside this folder.

1. index.html

Let's create index.html and add the following code to it:

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta http-equiv="X-UA-Compatible" content="ie=edge" />
    <title>Exchange Rate Calculator</title>
    <link rel="stylesheet" href="style.css" />
  </head>
  <body>
    <img src="img/money.png" alt="" class="money-img" />
    <h1>Exchange Rate Calculator</h1>
    <p>Choose the currency and the amounts to get the exchange rate</p>

    <div class="container">
      <div class="currency">
        <select id="currency-one">
          <option value="AED">AED</option>
          <option value="ARS">ARS</option>
          <option value="AUD">AUD</option>
          <option value="BGN">BGN</option>
          <option value="BRL">BRL</option>
          <option value="BSD">BSD</option>
          <option value="CAD">CAD</option>
          <option value="CHF">CHF</option>
          <option value="CLP">CLP</option>
          <option value="CNY">CNY</option>
          <option value="COP">COP</option>
          <option value="CZK">CZK</option>
          <option value="DKK">DKK</option>
          <option value="DOP">DOP</option>
          <option value="EGP">EGP</option>
          <option value="EUR">EUR</option>
          <option value="FJD">FJD</option>
          <option value="GBP">GBP</option>
          <option value="GTQ">GTQ</option>
          <option value="HKD">HKD</option>
          <option value="HRK">HRK</option>
          <option value="HUF">HUF</option>
          <option value="IDR">IDR</option>
          <option value="ILS">ILS</option>
          <option value="INR">INR</option>
          <option value="ISK">ISK</option>
          <option value="JPY">JPY</option>
          <option value="KRW">KRW</option>
          <option value="KZT">KZT</option>
          <option value="MXN">MXN</option>
          <option value="MYR">MYR</option>
          <option value="NOK">NOK</option>
          <option value="NZD">NZD</option>
          <option value="PAB">PAB</option>
          <option value="PEN">PEN</option>
          <option value="PHP">PHP</option>
          <option value="PKR">PKR</option>
          <option value="PLN">PLN</option>
          <option value="PYG">PYG</option>
          <option value="RON">RON</option>
          <option value="RUB">RUB</option>
          <option value="SAR">SAR</option>
          <option value="SEK">SEK</option>
          <option value="SGD">SGD</option>
          <option value="THB">THB</option>
          <option value="TRY">TRY</option>
          <option value="TWD">TWD</option>
          <option value="UAH">UAH</option>
          <option value="USD" selected>USD</option>
          <option value="UYU">UYU</option>
          <option value="VND">VND</option>
          <option value="ZAR">ZAR</option>
        </select>
        <input type="number" id="amount-one" placeholder="0" value="1" />
      </div>

      <div class="swap-rate-container">
        <button class="btn" id="swap">
          Swap
        </button>
        <div class="rate" id="rate"></div>
      </div>

      <div class="currency">
        <select id="currency-two">
          <option value="AED">AED</option>
          <option value="ARS">ARS</option>
          <option value="AUD">AUD</option>
          <option value="BGN">BGN</option>
          <option value="BRL">BRL</option>
          <option value="BSD">BSD</option>
          <option value="CAD">CAD</option>
          <option value="CHF">CHF</option>
          <option value="CLP">CLP</option>
          <option value="CNY">CNY</option>
          <option value="COP">COP</option>
          <option value="CZK">CZK</option>
          <option value="DKK">DKK</option>
          <option value="DOP">DOP</option>
          <option value="EGP">EGP</option>
          <option value="EUR" selected>EUR</option>
          <option value="FJD">FJD</option>
          <option value="GBP">GBP</option>
          <option value="GTQ">GTQ</option>
          <option value="HKD">HKD</option>
          <option value="HRK">HRK</option>
          <option value="HUF">HUF</option>
          <option value="IDR">IDR</option>
          <option value="ILS">ILS</option>
          <option value="INR">INR</option>
          <option value="ISK">ISK</option>
          <option value="JPY">JPY</option>
          <option value="KRW">KRW</option>
          <option value="KZT">KZT</option>
          <option value="MXN">MXN</option>
          <option value="MYR">MYR</option>
          <option value="NOK">NOK</option>
          <option value="NZD">NZD</option>
          <option value="PAB">PAB</option>
          <option value="PEN">PEN</option>
          <option value="PHP">PHP</option>
          <option value="PKR">PKR</option>
          <option value="PLN">PLN</option>
          <option value="PYG">PYG</option>
          <option value="RON">RON</option>
          <option value="RUB">RUB</option>
          <option value="SAR">SAR</option>
          <option value="SEK">SEK</option>
          <option value="SGD">SGD</option>
          <option value="THB">THB</option>
          <option value="TRY">TRY</option>
          <option value="TWD">TWD</option>
          <option value="UAH">UAH</option>
          <option value="USD">USD</option>
          <option value="UYU">UYU</option>
          <option value="VND">VND</option>
          <option value="ZAR">ZAR</option>
        </select>
        <input type="number" id="amount-two" placeholder="0" />
      </div>
    </div>

    <script src="script.js"></script>
  </body>
</html>

2. script.js

Let's create a JavaScript file named script.js and add the following JavaScript code to it:

const currencyEl_one = document.getElementById('currency-one');
const amountEl_one = document.getElementById('amount-one');
const currencyEl_two = document.getElementById('currency-two');
const amountEl_two = document.getElementById('amount-two');

const rateEl = document.getElementById('rate');
const swap = document.getElementById('swap');

// Fetch exchange rates and update the DOM
function calculate() {
  const currency_one = currencyEl_one.value;
  const currency_two = currencyEl_two.value;

  fetch(`https://api.exchangerate-api.com/v4/latest/${currency_one}`)
    .then(res => res.json())
    .then(data => {
      // console.log(data);
      const rate = data.rates[currency_two];

      rateEl.innerText = `1 ${currency_one} = ${rate} ${currency_two}`;

      amountEl_two.value = (amountEl_one.value * rate).toFixed(2);
    });
}

// Event listeners
currencyEl_one.addEventListener('change', calculate);
amountEl_one.addEventListener('input', calculate);
currencyEl_two.addEventListener('change', calculate);
amountEl_two.addEventListener('input', calculate);

swap.addEventListener('click', () => {
  const temp = currencyEl_one.value;
  currencyEl_one.value = currencyEl_two.value;
  currencyEl_two.value = temp;
  calculate();
});

calculate();

3. style.css

Let's create a CSS file named style.css and add the following CSS code to it:

:root {
  --primary-color: #5fbaa7;
}

* {
  box-sizing: border-box;
}

body {
  background-color: #f4f4f4;
  font-family: Arial, Helvetica, sans-serif;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100vh;
  margin: 0;
  padding: 20px;
}

h1 {
  color: var(--primary-color);
}

p {
  text-align: center;
}

.btn {
  color: #fff;
  background: var(--primary-color);
  cursor: pointer;
  border-radius: 5px;
  font-size: 12px;
  padding: 5px 12px;
}

.money-img {
  width: 150px;
}

.currency {
  padding: 40px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.currency select {
  padding: 10px 20px 10px 10px;
  -moz-appearance: none;
  -webkit-appearance: none;
  appearance: none;
  border: 1px solid #dedede;
  font-size: 16px;
  /*  You may not need these following lines. The arrow did not show for me on MacOS/Chrome so I added it. Just remove it if you would like  */
  background: transparent;
  background-image: url('data:image/svg+xml;charset=US-ASCII,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20width%3D%22292.4%22%20height%3D%22292.4%22%3E%3Cpath%20fill%3D%22%20000002%22%20d%3D%22M287%2069.4a17.6%2017.6%200%200%200-13-5.4H18.4c-5%200-9.3%201.8-12.9%205.4A17.6%2017.6%200%200%200%200%2082.2c0%205%201.8%209.3%205.4%2012.9l128%20127.9c3.6%203.6%207.8%205.4%2012.8%205.4s9.2-1.8%2012.8-5.4L287%2095c3.5-3.5%205.4-7.8%205.4-12.8%200-5-1.9-9.2-5.5-12.8z%22%2F%3E%3C%2Fsvg%3E');
  background-position: right 10px top 50%, 0, 0;
  background-size: 12px auto, 100%;
  background-repeat: no-repeat;
}

.currency input {
  border: 0;
  background: transparent;
  font-size: 30px;
  text-align: right;
}

.swap-rate-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.rate {
  color: var(--primary-color);
  font-size: 14px;
  padding: 0 10px;
}

select:focus,
input:focus,
button:focus {
  outline: 0;
}

@media (max-width: 600px) {
  .currency input {
    width: 200px;
  }
}

Open index.html in Browser

Let's open the index.html file in the browser and you will be able to see the following screen:

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