Pen Settings

HTML

CSS

CSS Base

Vendor Prefixing

Add External Stylesheets/Pens

Any URL's added here will be added as <link>s in order, and before the CSS in the editor. If you link to another Pen, it will include the CSS from that Pen. If the preprocessor matches, it will attempt to combine them before processing.

+ add another resource

JavaScript

Babel is required to process package imports. If you need a different preprocessor remove all packages first.

Add External Scripts/Pens

Any URL's added here will be added as <script>s in order, and run before the JavaScript in the editor. You can use the URL of any other Pen and it will include the JavaScript from that Pen.

+ add another resource

Behavior

Save Automatically?

If active, Pens will autosave every 30 seconds after being saved once.

Auto-Updating Preview

If enabled, the preview panel updates automatically as you code. If disabled, use the "Run" button to update.

Format on Save

If enabled, your code will be formatted when you actively save your Pen. Note: your code becomes un-folded during formatting.

Editor Settings

Code Indentation

Want to change your Syntax Highlighting theme, Fonts and more?

Visit your global Editor Settings.

HTML

              
                
<html lang="ja">
  <head>
    <meta charset="utf-8">
    <title>JavaScript example</title>
  </head>
  <body>
<label for="weather">今日の天気を選択してください: </label>
<select id="weather">
  <option value="">--選択してください--</option>
  <option value="sunny">晴れ</option>
  <option value="rainy">雨</option>
  <option value="snowing">雪</option>
  <option value="overcast">曇り</option>
</select>

<p></p>
              
            
!

CSS

              
                
              
            
!

JS

              
                
var select = document.querySelector('select');
var para = document.querySelector('p');

select.addEventListener('change', setWeather);

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

  if (choice === 'sunny') {
    para.textContent = '今日はとてもいい天気です。短いパンツをはいて、砂浜や公園に出かけ、アイスクリームを食べましょう!';
  } else if (choice === 'rainy') {
    para.textContent = '雨が降っています。レインコートと傘を忘れないようにして、できる限り室内で過ごしましょう。';
  } else if (choice === 'snowing') {
    para.textContent = '雪が降ってとても寒いです!室内でホットチョコレートを飲むか、雪だるまを作るのがよいでしょう。';
  } else if (choice === 'overcast') {
    para.textContent = '雨は降っていませんが、空はとても暗くなっています。万が一に備えレインコートを持ちましょう。';
  } else {
    para.textContent = '';
  }
}

              
            
!
999px

Console