javascript/building-blocks/simple-switch.html

<!DOCTYPE html>
<html lang="en-US">
  <head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width">
    <title>Simple switch example</title>
  </head>
  <body>
    <label for="weather">Select the weather type today: </label>
    <select id="weather">
      <option value="">--Make a choice--</option>
      <option value="sunny">Sunny</option>
      <option value="rainy">Rainy</option>
      <option value="snowing">Snowing</option>
      <option value="overcast">Overcast</option>
    </select>

    <p></p>

    <script>
      const select = document.querySelector('select');
      const para = document.querySelector('p');

      select.addEventListener("change", setWeather);

      function setWeather() {
        const choice = select.value;

        switch(choice) {
          case 'sunny':
            para.textContent = 'It is nice and sunny outside today. Wear shorts! Go to the beach, or the park, and get an ice cream.';
            break;
          case 'rainy':
            para.textContent = 'Rain is falling outside; take a rain coat and a brolly, and don\'t stay out for too long.';
            break;
          case 'snowing':
            para.textContent = 'The snow is coming down — it is freezing! Best to stay in with a cup of hot chocolate, or go build a snowman.';
            break;
          case 'overcast':
            para.textContent = 'It isn\'t raining, but the sky is grey and gloomy; it could turn any minute, so take a rain coat just in case.';
            break;
          default:
            para.textContent = '';
        }
      }
    </script>
  </body>
</html>