Java-script-course/09-dom-projects.html at main · Dev-Soft-tech/Java-script-course · GitHub

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<!DOCTYPE html>
<html>
  <head>
    <title>Dom project</title>
  </head>
  <body>
    <p>Youtube subscribe button</p>
    <button onclick="subscribe()" class="js-subscribe-button">Subscribe</button>
    <p>Amazon Shipping Calculator</p>
    <input placeholder="cost of order" class="js-cost-input" onkeydown="
      handleCostKeydown(event)">
    <button onclick="CalculateTotal();">Calculate</button>
    <p class="js-total-cost"></p>
    <script>
      function handleCostKeydown(event) {
        if (event.key === 'Enter') {
          CalculateTotal();
        }
      }
      function CalculateTotal() {
        const inputElement = document.querySelector('.js-cost-input');
        let cost = Number(inputElement.value);
        if (cost < 40) {
          cost = cost + 10;
        }
        document.querySelector('.js-total-cost')
          .innerHTML = `$${cost}`;
      }
      function subscribe() {
        const buttonElement = document.querySelector('.js-subscribe-button');
        if (buttonElement.innerText === 'Subscribe') {
          buttonElement.innerHTML = 'Subscribed';
        } else {
          buttonElement.innerHTML = 'Subscribe';
        }
      }
    </script>
  </body>
</html>