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JavaScript DOM

Last updated at Posted at 2023-11-20

DOMって何?

JavaScriptから、HTMLを操作できる

DOMでHTML要素を書き換えよう

dom.html

<!DOCTYPE html>
<html lang="ja">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>ブログ</title>
</head>
<body>
  <h1 id="dom">ブログ</h1>
  <form id="post-form">
    <label for="title">タイトル:</label><br>
    <input type="text" id="title" name="title"><br>
    <label for="content">本文:</label><br>
    <textarea id="content" name="content"></textarea><br>
    <input type="submit" value="Submit">
  </form>
  <div id="posts"></div>
  <script src="dom.js"></script>
</body>
</html>

dom.js

var dom = document.getElementById('dom');
dom.innerHTML = "シンプルブログ";

これは、
dom.htmlのh1(ブログ)をh1(シンプルブログ)に変更している

イベントハンドラを設定してみよう 〜なんか凄そう〜

dom/html

<!DOCTYPE html>
<html lang="ja">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>ブログ</title>
</head>
<body>
  <h1 id="dom">ブログ</h1>
  <form id="post-form">
    <label for="title">タイトル:</label><br>
    <input type="text" id="title" name="title"><br>
    <label for="content">本文:</label><br>
    <textarea id="content" name="content"></textarea><br>
    <input type="submit" value="Submit" id="submit">
  </form>
  <div id="posts"></div>
  <script src="dom.js"></script>
</body>
</html>

dom.js

document.getElementById('post-form').addEventListener('submit', function() {

  // タイトルと本文を取得
  const title = document.getElementById('title').value;
  const content = document.getElementById('content').value;

  // コンソールに出力
  console.log(title);
  console.log(content);
});

このコードは、
送信ボタンをクリックすると、
タイトルとコンテンツの文章をコンソールに出力する

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