JavaScriptでのフォーム操作

電子フォームとその中での移動に関するJavaScriptの完全かつ包括的な解説記事を以下に示します。

電子フォームとその中での移動に関するJavaScriptの完全なガイド

電子フォームは、ウェブサイトやアプリケーションでユーザーから情報を収集するための重要なツールです。フォームに入力されたデータを効率的に管理し、必要な操作を自動化するためには、JavaScriptを駆使することが非常に有効です。この記事では、電子フォームに関連する要素、フォーム間の移動、そしてJavaScriptを使ったフォーム操作の方法について、完全かつ包括的に解説します。

1. フォーム要素の理解

電子フォームにはさまざまな入力要素があります。代表的なものには以下が含まれます。

• テキスト入力フィールド（）
• パスワード入力フィールド（）
• ラジオボタン（）
• チェックボックス（）
• セレクトボックス（）
  テキストエリア（</code>）</li> </ul> <p data-start="570" data-end="675">これらの要素は、それぞれ異なるユーザー入力の方法を提供します。JavaScriptを使って、ユーザーがどのようにこれらの要素にデータを入力したかを確認したり、動的にフォームの内容を変更したりすることができます。</p> <h3 data-start="677" data-end="697"><span class="ez-toc-section" id="2_%E3%83%95%E3%82%A9%E3%83%BC%E3%83%A0%E5%86%85%E3%81%AE%E7%A7%BB%E5%8B%95%E3%82%92%E5%88%B6%E5%BE%A1%E3%81%99%E3%82%8B"></span>2. フォーム内の移動を制御する<span class="ez-toc-section-end"></span></h3> <p data-start="699" data-end="821">フォーム内でユーザーがどの入力フィールドに移動するかを制御することは、ユーザー体験を向上させるために非常に重要です。JavaScriptを使用して、特定の条件に基づいてユーザーが入力を終えた後に自動的に次のフィールドへ移動させることができます。</p> <h4 data-start="823" data-end="843"><span class="ez-toc-section" id="21_%E8%87%AA%E5%8B%95%E3%83%95%E3%82%A9%E3%83%BC%E3%82%AB%E3%82%B9%E3%81%AE%E8%A8%AD%E5%AE%9A"></span>2.1. 自動フォーカスの設定<span class="ez-toc-section-end"></span></h4> <p data-start="845" data-end="951"><code data-start="845" data-end="854">focus()</code>メソッドを使うことで、特定の入力フィールドに自動的にカーソルを移動させることができます。例えば、ページが読み込まれたときに最初の入力フィールドにフォーカスを当てたい場合、以下のように記述します。</p> <pre class="!overflow-visible" data-start="953" data-end="1017"><div class="contain-inline-size rounded-md border-[0.5px] border-token-border-medium relative bg-token-sidebar-surface-primary"><div class="flex items-center text-token-text-secondary px-4 py-2 text-xs font-sans justify-between h-9 bg-token-sidebar-surface-primary dark:bg-token-main-surface-secondary select-none rounded-t-[5px]">javascript</div><div class="sticky top-9"><div class="absolute bottom-0 right-0 flex h-9 items-center pr-2"><div class="flex items-center rounded bg-token-sidebar-surface-primary px-2 font-sans text-xs text-token-text-secondary dark:bg-token-main-surface-secondary"><span class="" data-state="closed"><button class="flex gap-1 items-center select-none px-4 py-1" aria-label="Copy"><svg width="24" height="24" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg" class="icon-xs"><path fill-rule="evenodd" clip-rule="evenodd" d="M7 5C7 3.34315 8.34315 2 10 2H19C20.6569 2 22 3.34315 22 5V14C22 15.6569 20.6569 17 19 17H17V19C17 20.6569 15.6569 22 14 22H5C3.34315 22 2 20.6569 2 19V10C2 8.34315 3.34315 7 5 7H7V5ZM9 7H14C15.6569 7 17 8.34315 17 10V15H19C19.5523 15 20 14.5523 20 14V5C20 4.44772 19.5523 4 19 4H10C9.44772 4 9 4.44772 9 5V7ZM5 9C4.44772 9 4 9.44772 4 10V19C4 19.5523 4.44772 20 5 20H14C14.5523 20 15 19.5523 15 19V10C15 9.44772 14.5523 9 14 9H5Z" fill="currentColor"></path></svg>Copy</button></span><span class="" data-state="closed"><button class="flex select-none items-center gap-1 px-4 py-1"><svg width="24" height="24" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg" class="icon-xs"><path d="M2.5 5.5C4.3 5.2 5.2 4 5.5 2.5C5.8 4 6.7 5.2 8.5 5.5C6.7 5.8 5.8 7 5.5 8.5C5.2 7 4.3 5.8 2.5 5.5Z" fill="currentColor" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"></path><path d="M5.66282 16.5231L5.18413 19.3952C5.12203 19.7678 5.09098 19.9541 5.14876 20.0888C5.19933 20.2067 5.29328 20.3007 5.41118 20.3512C5.54589 20.409 5.73218 20.378 6.10476 20.3159L8.97693 19.8372C9.72813 19.712 10.1037 19.6494 10.4542 19.521C10.7652 19.407 11.0608 19.2549 11.3343 19.068C11.6425 18.8575 11.9118 18.5882 12.4503 18.0497L20 10.5C21.3807 9.11929 21.3807 6.88071 20 5.5C18.6193 4.11929 16.3807 4.11929 15 5.5L7.45026 13.0497C6.91175 13.5882 6.6425 13.8575 6.43197 14.1657C6.24513 14.4392 6.09299 14.7348 5.97903 15.0458C5.85062 15.3963 5.78802 15.7719 5.66282 16.5231Z" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"></path><path d="M14.5 7L18.5 11" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"></path></svg>Edit</button></span></div></div></div><div class="overflow-y-auto p-4" dir="ltr"><code class="!whitespace-pre language-javascript"><span><span><span class="hljs-variable language_">document</span></span><span>.</span><span><span class="hljs-title function_">getElementById</span></span><span>(</span><span><span class="hljs-string">"firstInput"</span></span><span>).</span><span><span class="hljs-title function_">focus</span></span><span>(); </span></span></code></div></div></pre> <p data-start="1019" data-end="1073">これにより、<code data-start="1025" data-end="1042">id="firstInput"</code>というIDを持つ入力フィールドに自動的にカーソルが移動します。</p> <h4 data-start="1075" data-end="1093"><span class="ez-toc-section" id="22_%E5%85%A5%E5%8A%9B%E5%BE%8C%E3%81%AE%E8%87%AA%E5%8B%95%E7%A7%BB%E5%8B%95"></span>2.2. 入力後の自動移動<span class="ez-toc-section-end"></span></h4> <p data-start="1095" data-end="1194">ユーザーがある入力フィールドを終えた後、自動的に次のフィールドに移動する機能を実装することができます。例えば、テキスト入力が完了したら次のラジオボタンに移動する場合、以下のコードのように記述します。</p> <pre class="!overflow-visible" data-start="1196" data-end="1408"><div class="contain-inline-size rounded-md border-[0.5px] border-token-border-medium relative bg-token-sidebar-surface-primary"><div class="flex items-center text-token-text-secondary px-4 py-2 text-xs font-sans justify-between h-9 bg-token-sidebar-surface-primary dark:bg-token-main-surface-secondary select-none rounded-t-[5px]">javascript</div><div class="sticky top-9"><div class="absolute bottom-0 right-0 flex h-9 items-center pr-2"><div class="flex items-center rounded bg-token-sidebar-surface-primary px-2 font-sans text-xs text-token-text-secondary dark:bg-token-main-surface-secondary"><span class="" data-state="closed"><button class="flex gap-1 items-center select-none px-4 py-1" aria-label="Copy"><svg width="24" height="24" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg" class="icon-xs"><path fill-rule="evenodd" clip-rule="evenodd" d="M7 5C7 3.34315 8.34315 2 10 2H19C20.6569 2 22 3.34315 22 5V14C22 15.6569 20.6569 17 19 17H17V19C17 20.6569 15.6569 22 14 22H5C3.34315 22 2 20.6569 2 19V10C2 8.34315 3.34315 7 5 7H7V5ZM9 7H14C15.6569 7 17 8.34315 17 10V15H19C19.5523 15 20 14.5523 20 14V5C20 4.44772 19.5523 4 19 4H10C9.44772 4 9 4.44772 9 5V7ZM5 9C4.44772 9 4 9.44772 4 10V19C4 19.5523 4.44772 20 5 20H14C14.5523 20 15 19.5523 15 19V10C15 9.44772 14.5523 9 14 9H5Z" fill="currentColor"></path></svg>Copy</button></span><span class="" data-state="closed"><button class="flex select-none items-center gap-1 px-4 py-1"><svg width="24" height="24" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg" class="icon-xs"><path d="M2.5 5.5C4.3 5.2 5.2 4 5.5 2.5C5.8 4 6.7 5.2 8.5 5.5C6.7 5.8 5.8 7 5.5 8.5C5.2 7 4.3 5.8 2.5 5.5Z" fill="currentColor" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"></path><path d="M5.66282 16.5231L5.18413 19.3952C5.12203 19.7678 5.09098 19.9541 5.14876 20.0888C5.19933 20.2067 5.29328 20.3007 5.41118 20.3512C5.54589 20.409 5.73218 20.378 6.10476 20.3159L8.97693 19.8372C9.72813 19.712 10.1037 19.6494 10.4542 19.521C10.7652 19.407 11.0608 19.2549 11.3343 19.068C11.6425 18.8575 11.9118 18.5882 12.4503 18.0497L20 10.5C21.3807 9.11929 21.3807 6.88071 20 5.5C18.6193 4.11929 16.3807 4.11929 15 5.5L7.45026 13.0497C6.91175 13.5882 6.6425 13.8575 6.43197 14.1657C6.24513 14.4392 6.09299 14.7348 5.97903 15.0458C5.85062 15.3963 5.78802 15.7719 5.66282 16.5231Z" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"></path><path d="M14.5 7L18.5 11" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"></path></svg>Edit</button></span></div></div></div><div class="overflow-y-auto p-4" dir="ltr"><code class="!whitespace-pre language-javascript"><span><span><span class="hljs-variable language_">document</span></span><span>.</span><span><span class="hljs-title function_">getElementById</span></span><span>(</span><span><span class="hljs-string">"firstInput"</span></span><span>).</span><span><span class="hljs-title function_">addEventListener</span></span><span>(</span><span><span class="hljs-string">"input"</span></span><span>, </span><span><span class="hljs-keyword">function</span></span><span>(</span><span><span class="hljs-params"></span></span><span>) { </span><span><span class="hljs-keyword">if</span></span><span> (</span><span><span class="hljs-variable language_">this</span></span><span>.</span><span><span class="hljs-property">value</span></span><span>.</span><span><span class="hljs-property">length</span></span><span> === </span><span><span class="hljs-variable language_">this</span></span><span>.</span><span><span class="hljs-property">maxLength</span></span><span>) { </span><span><span class="hljs-variable language_">document</span></span><span>.</span><span><span class="hljs-title function_">getElementById</span></span><span>(</span><span><span class="hljs-string">"nextRadioButton"</span></span><span>).</span><span><span class="hljs-title function_">focus</span></span><span>(); } }); </span></span></code></div></div></pre> <p data-start="1410" data-end="1509">ここでは、<code data-start="1415" data-end="1427">firstInput</code>のテキスト入力フィールドに何かを入力すると、指定した最大文字数に達した時点で、次のラジオボタン（<code data-start="1475" data-end="1492">nextRadioButton</code>）にフォーカスを移動させています。</p> <h4 data-start="1511" data-end="1531"><span class="ez-toc-section" id="23_%E3%83%95%E3%82%A9%E3%83%BC%E3%83%A0%E5%86%85%E3%81%AE%E3%82%BF%E3%83%96%E7%A7%BB%E5%8B%95"></span>2.3. フォーム内のタブ移動<span class="ez-toc-section-end"></span></h4> <p data-start="1533" data-end="1642">ユーザーが<code data-start="1538" data-end="1543">Tab</code>キーを押して次の入力フィールドに移動する際、JavaScriptを使ってその順番をカスタマイズすることもできます。例えば、次のフィールドにフォーカスを移動するカスタムタブ順を設定することができます。</p> <pre class="!overflow-visible" data-start="1644" data-end="1921"><div class="contain-inline-size rounded-md border-[0.5px] border-token-border-medium relative bg-token-sidebar-surface-primary"><div class="flex items-center text-token-text-secondary px-4 py-2 text-xs font-sans justify-between h-9 bg-token-sidebar-surface-primary dark:bg-token-main-surface-secondary select-none rounded-t-[5px]">javascript</div><div class="sticky top-9"><div class="absolute bottom-0 right-0 flex h-9 items-center pr-2"><div class="flex items-center rounded bg-token-sidebar-surface-primary px-2 font-sans text-xs text-token-text-secondary dark:bg-token-main-surface-secondary"><span class="" data-state="closed"><button class="flex gap-1 items-center select-none px-4 py-1" aria-label="Copy"><svg width="24" height="24" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg" class="icon-xs"><path fill-rule="evenodd" clip-rule="evenodd" d="M7 5C7 3.34315 8.34315 2 10 2H19C20.6569 2 22 3.34315 22 5V14C22 15.6569 20.6569 17 19 17H17V19C17 20.6569 15.6569 22 14 22H5C3.34315 22 2 20.6569 2 19V10C2 8.34315 3.34315 7 5 7H7V5ZM9 7H14C15.6569 7 17 8.34315 17 10V15H19C19.5523 15 20 14.5523 20 14V5C20 4.44772 19.5523 4 19 4H10C9.44772 4 9 4.44772 9 5V7ZM5 9C4.44772 9 4 9.44772 4 10V19C4 19.5523 4.44772 20 5 20H14C14.5523 20 15 19.5523 15 19V10C15 9.44772 14.5523 9 14 9H5Z" fill="currentColor"></path></svg>Copy</button></span><span class="" data-state="closed"><button class="flex select-none items-center gap-1 px-4 py-1"><svg width="24" height="24" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg" class="icon-xs"><path d="M2.5 5.5C4.3 5.2 5.2 4 5.5 2.5C5.8 4 6.7 5.2 8.5 5.5C6.7 5.8 5.8 7 5.5 8.5C5.2 7 4.3 5.8 2.5 5.5Z" fill="currentColor" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"></path><path d="M5.66282 16.5231L5.18413 19.3952C5.12203 19.7678 5.09098 19.9541 5.14876 20.0888C5.19933 20.2067 5.29328 20.3007 5.41118 20.3512C5.54589 20.409 5.73218 20.378 6.10476 20.3159L8.97693 19.8372C9.72813 19.712 10.1037 19.6494 10.4542 19.521C10.7652 19.407 11.0608 19.2549 11.3343 19.068C11.6425 18.8575 11.9118 18.5882 12.4503 18.0497L20 10.5C21.3807 9.11929 21.3807 6.88071 20 5.5C18.6193 4.11929 16.3807 4.11929 15 5.5L7.45026 13.0497C6.91175 13.5882 6.6425 13.8575 6.43197 14.1657C6.24513 14.4392 6.09299 14.7348 5.97903 15.0458C5.85062 15.3963 5.78802 15.7719 5.66282 16.5231Z" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"></path><path d="M14.5 7L18.5 11" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"></path></svg>Edit</button></span></div></div></div><div class="overflow-y-auto p-4" dir="ltr"><code class="!whitespace-pre language-javascript"><span><span><span class="hljs-variable language_">document</span></span><span>.</span><span><span class="hljs-title function_">addEventListener</span></span><span>(</span><span><span class="hljs-string">"keydown"</span></span><span>, </span><span><span class="hljs-keyword">function</span></span><span>(</span><span><span class="hljs-params">event</span></span><span>) { </span><span><span class="hljs-keyword">if</span></span><span> (event.</span><span><span class="hljs-property">key</span></span><span> === </span><span><span class="hljs-string">"Tab"</span></span><span>) { </span><span><span class="hljs-keyword">if</span></span><span> (</span><span><span class="hljs-variable language_">document</span></span><span>.</span><span><span class="hljs-property">activeElement</span></span><span>.</span><span><span class="hljs-property">id</span></span><span> === </span><span><span class="hljs-string">"firstInput"</span></span><span>) { </span><span><span class="hljs-variable language_">document</span></span><span>.</span><span><span class="hljs-title function_">getElementById</span></span><span>(</span><span><span class="hljs-string">"secondInput"</span></span><span>).</span><span><span class="hljs-title function_">focus</span></span><span>(); event.</span><span><span class="hljs-title function_">preventDefault</span></span><span>(); } } }); </span></span></code></div></div></pre> <p data-start="1923" data-end="2046">このコードでは、<code data-start="1931" data-end="1936">Tab</code>キーが押された際に、<code data-start="1946" data-end="1958">firstInput</code>フィールドから<code data-start="1965" data-end="1978">secondInput</code>フィールドに移動するように制御しています。<code data-start="1999" data-end="2023">event.preventDefault()</code>を使って、デフォルトのタブ移動を防いでいます。</p> <h3 data-start="2048" data-end="2068"><span class="ez-toc-section" id="3_%E3%83%90%E3%83%AA%E3%83%87%E3%83%BC%E3%82%B7%E3%83%A7%E3%83%B3%E3%81%A8%E3%82%A8%E3%83%A9%E3%83%BC%E8%A1%A8%E7%A4%BA"></span>3. バリデーションとエラー表示<span class="ez-toc-section-end"></span></h3> <p data-start="2070" data-end="2176">フォームを送信する前に、入力データが正しいかを確認するためのバリデーションを実行することが重要です。JavaScriptを使って、ユーザーが間違ったデータを入力した場合にエラーメッセージを表示することができます。</p> <h4 data-start="2178" data-end="2198"><span class="ez-toc-section" id="31_%E5%9F%BA%E6%9C%AC%E7%9A%84%E3%81%AA%E5%85%A5%E5%8A%9B%E3%83%81%E3%82%A7%E3%83%83%E3%82%AF"></span>3.1. 基本的な入力チェック<span class="ez-toc-section-end"></span></h4> <p data-start="2200" data-end="2243">以下の例では、メールアドレスが正しい形式で入力されているかどうかをチェックしています。</p> <pre class="!overflow-visible" data-start="2245" data-end="2781"><div class="contain-inline-size rounded-md border-[0.5px] border-token-border-medium relative bg-token-sidebar-surface-primary"><div class="flex items-center text-token-text-secondary px-4 py-2 text-xs font-sans justify-between h-9 bg-token-sidebar-surface-primary dark:bg-token-main-surface-secondary select-none rounded-t-[5px]">javascript</div><div class="sticky top-9"><div class="absolute bottom-0 right-0 flex h-9 items-center pr-2"><div class="flex items-center rounded bg-token-sidebar-surface-primary px-2 font-sans text-xs text-token-text-secondary dark:bg-token-main-surface-secondary"><span class="" data-state="closed"><button class="flex gap-1 items-center select-none px-4 py-1" aria-label="Copy"><svg width="24" height="24" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg" class="icon-xs"><path fill-rule="evenodd" clip-rule="evenodd" d="M7 5C7 3.34315 8.34315 2 10 2H19C20.6569 2 22 3.34315 22 5V14C22 15.6569 20.6569 17 19 17H17V19C17 20.6569 15.6569 22 14 22H5C3.34315 22 2 20.6569 2 19V10C2 8.34315 3.34315 7 5 7H7V5ZM9 7H14C15.6569 7 17 8.34315 17 10V15H19C19.5523 15 20 14.5523 20 14V5C20 4.44772 19.5523 4 19 4H10C9.44772 4 9 4.44772 9 5V7ZM5 9C4.44772 9 4 9.44772 4 10V19C4 19.5523 4.44772 20 5 20H14C14.5523 20 15 19.5523 15 19V10C15 9.44772 14.5523 9 14 9H5Z" fill="currentColor"></path></svg>Copy</button></span><span class="" data-state="closed"><button class="flex select-none items-center gap-1 px-4 py-1"><svg width="24" height="24" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg" class="icon-xs"><path d="M2.5 5.5C4.3 5.2 5.2 4 5.5 2.5C5.8 4 6.7 5.2 8.5 5.5C6.7 5.8 5.8 7 5.5 8.5C5.2 7 4.3 5.8 2.5 5.5Z" fill="currentColor" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"></path><path d="M5.66282 16.5231L5.18413 19.3952C5.12203 19.7678 5.09098 19.9541 5.14876 20.0888C5.19933 20.2067 5.29328 20.3007 5.41118 20.3512C5.54589 20.409 5.73218 20.378 6.10476 20.3159L8.97693 19.8372C9.72813 19.712 10.1037 19.6494 10.4542 19.521C10.7652 19.407 11.0608 19.2549 11.3343 19.068C11.6425 18.8575 11.9118 18.5882 12.4503 18.0497L20 10.5C21.3807 9.11929 21.3807 6.88071 20 5.5C18.6193 4.11929 16.3807 4.11929 15 5.5L7.45026 13.0497C6.91175 13.5882 6.6425 13.8575 6.43197 14.1657C6.24513 14.4392 6.09299 14.7348 5.97903 15.0458C5.85062 15.3963 5.78802 15.7719 5.66282 16.5231Z" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"></path><path d="M14.5 7L18.5 11" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"></path></svg>Edit</button></span></div></div></div><div class="overflow-y-auto p-4" dir="ltr"><code class="!whitespace-pre language-javascript"><span><span><span class="hljs-keyword">function</span></span><span> </span><span><span class="hljs-title function_">validateEmail</span></span><span>(</span><span><span class="hljs-params"></span></span><span>) { </span><span><span class="hljs-keyword">var</span></span><span> email = </span><span><span class="hljs-variable language_">document</span></span><span>.</span><span><span class="hljs-title function_">getElementById</span></span><span>(</span><span><span class="hljs-string">"emailInput"</span></span><span>).</span><span><span class="hljs-property">value</span></span><span>; </span><span><span class="hljs-keyword">var</span></span><span> regex = </span><span><span class="hljs-regexp">/^[^\s@]+@[^\s@]+\.[^\s@]+$/</span></span><span>; </span><span><span class="hljs-keyword">if</span></span><span> (!regex.</span><span><span class="hljs-title function_">test</span></span><span>(email)) { </span><span><span class="hljs-variable language_">document</span></span><span>.</span><span><span class="hljs-title function_">getElementById</span></span><span>(</span><span><span class="hljs-string">"emailError"</span></span><span>).</span><span><span class="hljs-property">innerText</span></span><span> = </span><span><span class="hljs-string">"無効なメールアドレスです"</span></span><span>; </span><span><span class="hljs-keyword">return</span></span><span> </span><span><span class="hljs-literal">false</span></span><span>; } </span><span><span class="hljs-keyword">else</span></span><span> { </span><span><span class="hljs-variable language_">document</span></span><span>.</span><span><span class="hljs-title function_">getElementById</span></span><span>(</span><span><span class="hljs-string">"emailError"</span></span><span>).</span><span><span class="hljs-property">innerText</span></span><span> = </span><span><span class="hljs-string">""</span></span><span>; </span><span><span class="hljs-keyword">return</span></span><span> </span><span><span class="hljs-literal">true</span></span><span>; } } </span><span><span class="hljs-variable language_">document</span></span><span>.</span><span><span class="hljs-title function_">getElementById</span></span><span>(</span><span><span class="hljs-string">"submitButton"</span></span><span>).</span><span><span class="hljs-title function_">addEventListener</span></span><span>(</span><span><span class="hljs-string">"click"</span></span><span>, </span><span><span class="hljs-keyword">function</span></span><span>(</span><span><span class="hljs-params">event</span></span><span>) { </span><span><span class="hljs-keyword">if</span></span><span> (!</span><span><span class="hljs-title function_">validateEmail</span></span><span>()) { event.</span><span><span class="hljs-title function_">preventDefault</span></span><span>(); } }); </span></span></code></div></div></pre> <p data-start="2783" data-end="2893">このコードでは、ユーザーがメールアドレスを入力した際、その形式が正しいかどうかをチェックし、間違っていればエラーメッセージを表示します。<code data-start="2851" data-end="2865">submitButton</code>がクリックされた際に、エラーがある場合は送信を防ぎます。</p> <h4 data-start="2895" data-end="2919"><span class="ez-toc-section" id="32_%E3%83%95%E3%82%A3%E3%83%BC%E3%83%AB%E3%83%89%E3%81%AE%E5%BF%85%E9%A0%88%E5%85%A5%E5%8A%9B%E3%83%81%E3%82%A7%E3%83%83%E3%82%AF"></span>3.2. フィールドの必須入力チェック<span class="ez-toc-section-end"></span></h4> <p data-start="2921" data-end="2970">特定の入力フィールドが必須である場合、以下のようにチェックを行い、未入力の場合は警告を表示します。</p> <pre class="!overflow-visible" data-start="2972" data-end="3481"><div class="contain-inline-size rounded-md border-[0.5px] border-token-border-medium relative bg-token-sidebar-surface-primary"><div class="flex items-center text-token-text-secondary px-4 py-2 text-xs font-sans justify-between h-9 bg-token-sidebar-surface-primary dark:bg-token-main-surface-secondary select-none rounded-t-[5px]">javascript</div><div class="sticky top-9"><div class="absolute bottom-0 right-0 flex h-9 items-center pr-2"><div class="flex items-center rounded bg-token-sidebar-surface-primary px-2 font-sans text-xs text-token-text-secondary dark:bg-token-main-surface-secondary"><span class="" data-state="closed"><button class="flex gap-1 items-center select-none px-4 py-1" aria-label="Copy"><svg width="24" height="24" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg" class="icon-xs"><path fill-rule="evenodd" clip-rule="evenodd" d="M7 5C7 3.34315 8.34315 2 10 2H19C20.6569 2 22 3.34315 22 5V14C22 15.6569 20.6569 17 19 17H17V19C17 20.6569 15.6569 22 14 22H5C3.34315 22 2 20.6569 2 19V10C2 8.34315 3.34315 7 5 7H7V5ZM9 7H14C15.6569 7 17 8.34315 17 10V15H19C19.5523 15 20 14.5523 20 14V5C20 4.44772 19.5523 4 19 4H10C9.44772 4 9 4.44772 9 5V7ZM5 9C4.44772 9 4 9.44772 4 10V19C4 19.5523 4.44772 20 5 20H14C14.5523 20 15 19.5523 15 19V10C15 9.44772 14.5523 9 14 9H5Z" fill="currentColor"></path></svg>Copy</button></span><span class="" data-state="closed"><button class="flex select-none items-center gap-1 px-4 py-1"><svg width="24" height="24" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg" class="icon-xs"><path d="M2.5 5.5C4.3 5.2 5.2 4 5.5 2.5C5.8 4 6.7 5.2 8.5 5.5C6.7 5.8 5.8 7 5.5 8.5C5.2 7 4.3 5.8 2.5 5.5Z" fill="currentColor" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"></path><path d="M5.66282 16.5231L5.18413 19.3952C5.12203 19.7678 5.09098 19.9541 5.14876 20.0888C5.19933 20.2067 5.29328 20.3007 5.41118 20.3512C5.54589 20.409 5.73218 20.378 6.10476 20.3159L8.97693 19.8372C9.72813 19.712 10.1037 19.6494 10.4542 19.521C10.7652 19.407 11.0608 19.2549 11.3343 19.068C11.6425 18.8575 11.9118 18.5882 12.4503 18.0497L20 10.5C21.3807 9.11929 21.3807 6.88071 20 5.5C18.6193 4.11929 16.3807 4.11929 15 5.5L7.45026 13.0497C6.91175 13.5882 6.6425 13.8575 6.43197 14.1657C6.24513 14.4392 6.09299 14.7348 5.97903 15.0458C5.85062 15.3963 5.78802 15.7719 5.66282 16.5231Z" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"></path><path d="M14.5 7L18.5 11" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"></path></svg>Edit</button></span></div></div></div><div class="overflow-y-auto p-4" dir="ltr"><code class="!whitespace-pre language-javascript"><span><span><span class="hljs-keyword">function</span></span><span> </span><span><span class="hljs-title function_">validateRequiredField</span></span><span>(</span><span><span class="hljs-params"></span></span><span>) { </span><span><span class="hljs-keyword">var</span></span><span> input = </span><span><span class="hljs-variable language_">document</span></span><span>.</span><span><span class="hljs-title function_">getElementById</span></span><span>(</span><span><span class="hljs-string">"requiredInput"</span></span><span>).</span><span><span class="hljs-property">value</span></span><span>; </span><span><span class="hljs-keyword">if</span></span><span> (input === </span><span><span class="hljs-string">""</span></span><span>) { </span><span><span class="hljs-variable language_">document</span></span><span>.</span><span><span class="hljs-title function_">getElementById</span></span><span>(</span><span><span class="hljs-string">"requiredError"</span></span><span>).</span><span><span class="hljs-property">innerText</span></span><span> = </span><span><span class="hljs-string">"このフィールドは必須です"</span></span><span>; </span><span><span class="hljs-keyword">return</span></span><span> </span><span><span class="hljs-literal">false</span></span><span>; } </span><span><span class="hljs-keyword">else</span></span><span> { </span><span><span class="hljs-variable language_">document</span></span><span>.</span><span><span class="hljs-title function_">getElementById</span></span><span>(</span><span><span class="hljs-string">"requiredError"</span></span><span>).</span><span><span class="hljs-property">innerText</span></span><span> = </span><span><span class="hljs-string">""</span></span><span>; </span><span><span class="hljs-keyword">return</span></span><span> </span><span><span class="hljs-literal">true</span></span><span>; } } </span><span><span class="hljs-variable language_">document</span></span><span>.</span><span><span class="hljs-title function_">getElementById</span></span><span>(</span><span><span class="hljs-string">"submitButton"</span></span><span>).</span><span><span class="hljs-title function_">addEventListener</span></span><span>(</span><span><span class="hljs-string">"click"</span></span><span>, </span><span><span class="hljs-keyword">function</span></span><span>(</span><span><span class="hljs-params">event</span></span><span>) { </span><span><span class="hljs-keyword">if</span></span><span> (!</span><span><span class="hljs-title function_">validateRequiredField</span></span><span>()) { event.</span><span><span class="hljs-title function_">preventDefault</span></span><span>(); } }); </span></span></code></div></div></pre> <p data-start="3483" data-end="3550">このコードでは、<code data-start="3491" data-end="3506">requiredInput</code>というIDを持つフィールドが空でないかを確認し、空であればエラーメッセージを表示します。</p> <h3 data-start="3552" data-end="3568"><span class="ez-toc-section" id="4_%E3%83%95%E3%82%A9%E3%83%BC%E3%83%A0%E9%80%81%E4%BF%A1%E3%81%AE%E5%88%B6%E5%BE%A1"></span>4. フォーム送信の制御<span class="ez-toc-section-end"></span></h3> <p data-start="3570" data-end="3672">フォーム送信時にJavaScriptを使って処理をカスタマイズすることも可能です。例えば、送信ボタンがクリックされたときに、特定の条件が満たされている場合にのみ送信を許可するように制御することができます。</p> <pre class="!overflow-visible" data-start="3674" data-end="3905"><div class="contain-inline-size rounded-md border-[0.5px] border-token-border-medium relative bg-token-sidebar-surface-primary"><div class="flex items-center text-token-text-secondary px-4 py-2 text-xs font-sans justify-between h-9 bg-token-sidebar-surface-primary dark:bg-token-main-surface-secondary select-none rounded-t-[5px]">javascript</div><div class="sticky top-9"><div class="absolute bottom-0 right-0 flex h-9 items-center pr-2"><div class="flex items-center rounded bg-token-sidebar-surface-primary px-2 font-sans text-xs text-token-text-secondary dark:bg-token-main-surface-secondary"><span class="" data-state="closed"><button class="flex gap-1 items-center select-none px-4 py-1" aria-label="Copy"><svg width="24" height="24" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg" class="icon-xs"><path fill-rule="evenodd" clip-rule="evenodd" d="M7 5C7 3.34315 8.34315 2 10 2H19C20.6569 2 22 3.34315 22 5V14C22 15.6569 20.6569 17 19 17H17V19C17 20.6569 15.6569 22 14 22H5C3.34315 22 2 20.6569 2 19V10C2 8.34315 3.34315 7 5 7H7V5ZM9 7H14C15.6569 7 17 8.34315 17 10V15H19C19.5523 15 20 14.5523 20 14V5C20 4.44772 19.5523 4 19 4H10C9.44772 4 9 4.44772 9 5V7ZM5 9C4.44772 9 4 9.44772 4 10V19C4 19.5523 4.44772 20 5 20H14C14.5523 20 15 19.5523 15 19V10C15 9.44772 14.5523 9 14 9H5Z" fill="currentColor"></path></svg>Copy</button></span><span class="" data-state="closed"><button class="flex select-none items-center gap-1 px-4 py-1"><svg width="24" height="24" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg" class="icon-xs"><path d="M2.5 5.5C4.3 5.2 5.2 4 5.5 2.5C5.8 4 6.7 5.2 8.5 5.5C6.7 5.8 5.8 7 5.5 8.5C5.2 7 4.3 5.8 2.5 5.5Z" fill="currentColor" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"></path><path d="M5.66282 16.5231L5.18413 19.3952C5.12203 19.7678 5.09098 19.9541 5.14876 20.0888C5.19933 20.2067 5.29328 20.3007 5.41118 20.3512C5.54589 20.409 5.73218 20.378 6.10476 20.3159L8.97693 19.8372C9.72813 19.712 10.1037 19.6494 10.4542 19.521C10.7652 19.407 11.0608 19.2549 11.3343 19.068C11.6425 18.8575 11.9118 18.5882 12.4503 18.0497L20 10.5C21.3807 9.11929 21.3807 6.88071 20 5.5C18.6193 4.11929 16.3807 4.11929 15 5.5L7.45026 13.0497C6.91175 13.5882 6.6425 13.8575 6.43197 14.1657C6.24513 14.4392 6.09299 14.7348 5.97903 15.0458C5.85062 15.3963 5.78802 15.7719 5.66282 16.5231Z" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"></path><path d="M14.5 7L18.5 11" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"></path></svg>Edit</button></span></div></div></div><div class="overflow-y-auto p-4" dir="ltr"><code class="!whitespace-pre language-javascript"><span><span><span class="hljs-variable language_">document</span></span><span>.</span><span><span class="hljs-title function_">getElementById</span></span><span>(</span><span><span class="hljs-string">"submitButton"</span></span><span>).</span><span><span class="hljs-title function_">addEventListener</span></span><span>(</span><span><span class="hljs-string">"click"</span></span><span>, </span><span><span class="hljs-keyword">function</span></span><span>(</span><span><span class="hljs-params">event</span></span><span>) { </span><span><span class="hljs-keyword">if</span></span><span> (!</span><span><span class="hljs-title function_">validateEmail</span></span><span>() || !</span><span><span class="hljs-title function_">validateRequiredField</span></span><span>()) { event.</span><span><span class="hljs-title function_">preventDefault</span></span><span>(); </span><span><span class="hljs-title function_">alert</span></span><span>(</span><span><span class="hljs-string">"フォームにエラーがあります"</span></span><span>); } }); </span></span></code></div></div></pre> <p data-start="3907" data-end="3969">このコードでは、送信ボタンがクリックされる前にバリデーションが実行され、もしエラーがあれば送信を防いでアラートを表示します。</p> <h3 data-start="3971" data-end="3981"><span class="ez-toc-section" id="5_%E3%81%BE%E3%81%A8%E3%82%81"></span>5. まとめ<span class="ez-toc-section-end"></span></h3> <p data-start="3983" data-end="4169" data-is-only-node="">JavaScriptを使用することで、電子フォームの操作性を大幅に向上させることができます。ユーザーがフォームを快適に利用できるように、入力フィールドの移動、バリデーション、エラー表示、送信の制御など、さまざまな要素を組み合わせて、より効率的で効果的なフォームを作成できます。このような技術を駆使することで、ユーザー体験を高め、よりスムーズなフォーム操作が可能になります。</p> </div> </div> </div> </p> </div><!-- .entry-content /--> <div id="post-extra-info"> <div class="theiaStickySidebar"> <div class="single-post-meta post-meta clearfix"><span class="meta-item last-updated">Last Updated: 19/03/2025</span><div class="tie-alignright"><span class="meta-views meta-item "><span class="tie-icon-fire" aria-hidden="true"></span> 9 </span><span class="meta-reading-time meta-item"><span class="tie-icon-bookmark" aria-hidden="true"></span> 1 minute read</span> </div></div><!-- .post-meta --> <div id="share-buttons-top" class="share-buttons share-buttons-top"> <div class="share-links share-centered icons-only share-rounded"> <a href="https://www.facebook.com/sharer.php?u=https://bunkao.com/javascript%e3%81%a7%e3%81%ae%e3%83%95%e3%82%a9%e3%83%bc%e3%83%a0%e6%93%8d%e4%bd%9c/" rel="external noopener nofollow" title="Facebook" target="_blank" class="facebook-share-btn " data-raw="https://www.facebook.com/sharer.php?u={post_link}"> <span class="share-btn-icon tie-icon-facebook"></span> <span class="screen-reader-text">Facebook</span> </a> <a 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}\n});\n\n\u3053\u306e\u30b3\u30fc\u30c9\u3067\u306f\u3001Tab\u30ad\u30fc\u304c\u62bc\u3055\u308c\u305f\u969b\u306b\u3001firstInput\u30d5\u30a3\u30fc\u30eb\u30c9\u304b\u3089secondInput\u30d5\u30a3\u30fc\u30eb\u30c9\u306b\u79fb\u52d5\u3059\u308b\u3088\u3046\u306b\u5236\u5fa1\u3057\u3066\u3044\u307e\u3059\u3002event.preventDefault()\u3092\u4f7f\u3063\u3066\u3001\u30c7\u30d5\u30a9\u30eb\u30c8\u306e\u30bf\u30d6\u79fb\u52d5\u3092\u9632\u3044\u3067\u3044\u307e\u3059\u3002\n3. \u30d0\u30ea\u30c7\u30fc\u30b7\u30e7\u30f3\u3068\u30a8\u30e9\u30fc\u8868\u793a\n\u30d5\u30a9\u30fc\u30e0\u3092\u9001\u4fe1\u3059\u308b\u524d\u306b\u3001\u5165\u529b\u30c7\u30fc\u30bf\u304c\u6b63\u3057\u3044\u304b\u3092\u78ba\u8a8d\u3059\u308b\u305f\u3081\u306e\u30d0\u30ea\u30c7\u30fc\u30b7\u30e7\u30f3\u3092\u5b9f\u884c\u3059\u308b\u3053\u3068\u304c\u91cd\u8981\u3067\u3059\u3002JavaScript\u3092\u4f7f\u3063\u3066\u3001\u30e6\u30fc\u30b6\u30fc\u304c\u9593\u9055\u3063\u305f\u30c7\u30fc\u30bf\u3092\u5165\u529b\u3057\u305f\u5834\u5408\u306b\u30a8\u30e9\u30fc\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u8868\u793a\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\n3.1. \u57fa\u672c\u7684\u306a\u5165\u529b\u30c1\u30a7\u30c3\u30af\n\u4ee5\u4e0b\u306e\u4f8b\u3067\u306f\u3001\u30e1\u30fc\u30eb\u30a2\u30c9\u30ec\u30b9\u304c\u6b63\u3057\u3044\u5f62\u5f0f\u3067\u5165\u529b\u3055\u308c\u3066\u3044\u308b\u304b\u3069\u3046\u304b\u3092\u30c1\u30a7\u30c3\u30af\u3057\u3066\u3044\u307e\u3059\u3002\njavascriptCopyEditfunction validateEmail() {\n var email = document.getElementById(\"emailInput\").value;\n var regex = \/^[^\\s@]+@[^\\s@]+\\.[^\\s@]+$\/;\n if (!regex.test(email)) {\n document.getElementById(\"emailError\").innerText = \"\u7121\u52b9\u306a\u30e1\u30fc\u30eb\u30a2\u30c9\u30ec\u30b9\u3067\u3059\";\n return false;\n } else {\n document.getElementById(\"emailError\").innerText = \"\";\n return true;\n }\n}\n\ndocument.getElementById(\"submitButton\").addEventListener(\"click\", function(event) {\n if (!validateEmail()) {\n event.preventDefault();\n }\n});\n\n\u3053\u306e\u30b3\u30fc\u30c9\u3067\u306f\u3001\u30e6\u30fc\u30b6\u30fc\u304c\u30e1\u30fc\u30eb\u30a2\u30c9\u30ec\u30b9\u3092\u5165\u529b\u3057\u305f\u969b\u3001\u305d\u306e\u5f62\u5f0f\u304c\u6b63\u3057\u3044\u304b\u3069\u3046\u304b\u3092\u30c1\u30a7\u30c3\u30af\u3057\u3001\u9593\u9055\u3063\u3066\u3044\u308c\u3070\u30a8\u30e9\u30fc\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u8868\u793a\u3057\u307e\u3059\u3002submitButton\u304c\u30af\u30ea\u30c3\u30af\u3055\u308c\u305f\u969b\u306b\u3001\u30a8\u30e9\u30fc\u304c\u3042\u308b\u5834\u5408\u306f\u9001\u4fe1\u3092\u9632\u304e\u307e\u3059\u3002\n3.2. \u30d5\u30a3\u30fc\u30eb\u30c9\u306e\u5fc5\u9808\u5165\u529b\u30c1\u30a7\u30c3\u30af\n\u7279\u5b9a\u306e\u5165\u529b\u30d5\u30a3\u30fc\u30eb\u30c9\u304c\u5fc5\u9808\u3067\u3042\u308b\u5834\u5408\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u30c1\u30a7\u30c3\u30af\u3092\u884c\u3044\u3001\u672a\u5165\u529b\u306e\u5834\u5408\u306f\u8b66\u544a\u3092\u8868\u793a\u3057\u307e\u3059\u3002\njavascriptCopyEditfunction validateRequiredField() {\n var input = document.getElementById(\"requiredInput\").value;\n if (input === \"\") {\n document.getElementById(\"requiredError\").innerText = \"\u3053\u306e\u30d5\u30a3\u30fc\u30eb\u30c9\u306f\u5fc5\u9808\u3067\u3059\";\n return false;\n } else {\n document.getElementById(\"requiredError\").innerText = \"\";\n return true;\n }\n}\n\ndocument.getElementById(\"submitButton\").addEventListener(\"click\", function(event) {\n if (!validateRequiredField()) {\n event.preventDefault();\n }\n});\n\n\u3053\u306e\u30b3\u30fc\u30c9\u3067\u306f\u3001requiredInput\u3068\u3044\u3046ID\u3092\u6301\u3064\u30d5\u30a3\u30fc\u30eb\u30c9\u304c\u7a7a\u3067\u306a\u3044\u304b\u3092\u78ba\u8a8d\u3057\u3001\u7a7a\u3067\u3042\u308c\u3070\u30a8\u30e9\u30fc\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u8868\u793a\u3057\u307e\u3059\u3002\n4. \u30d5\u30a9\u30fc\u30e0\u9001\u4fe1\u306e\u5236\u5fa1\n\u30d5\u30a9\u30fc\u30e0\u9001\u4fe1\u6642\u306bJavaScript\u3092\u4f7f\u3063\u3066\u51e6\u7406\u3092\u30ab\u30b9\u30bf\u30de\u30a4\u30ba\u3059\u308b\u3053\u3068\u3082\u53ef\u80fd\u3067\u3059\u3002\u4f8b\u3048\u3070\u3001\u9001\u4fe1\u30dc\u30bf\u30f3\u304c\u30af\u30ea\u30c3\u30af\u3055\u308c\u305f\u3068\u304d\u306b\u3001\u7279\u5b9a\u306e\u6761\u4ef6\u304c\u6e80\u305f\u3055\u308c\u3066\u3044\u308b\u5834\u5408\u306b\u306e\u307f\u9001\u4fe1\u3092\u8a31\u53ef\u3059\u308b\u3088\u3046\u306b\u5236\u5fa1\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\njavascriptCopyEditdocument.getElementById(\"submitButton\").addEventListener(\"click\", function(event) {\n if (!validateEmail() || !validateRequiredField()) {\n event.preventDefault();\n alert(\"\u30d5\u30a9\u30fc\u30e0\u306b\u30a8\u30e9\u30fc\u304c\u3042\u308a\u307e\u3059\");\n }\n});\n\n\u3053\u306e\u30b3\u30fc\u30c9\u3067\u306f\u3001\u9001\u4fe1\u30dc\u30bf\u30f3\u304c\u30af\u30ea\u30c3\u30af\u3055\u308c\u308b\u524d\u306b\u30d0\u30ea\u30c7\u30fc\u30b7\u30e7\u30f3\u304c\u5b9f\u884c\u3055\u308c\u3001\u3082\u3057\u30a8\u30e9\u30fc\u304c\u3042\u308c\u3070\u9001\u4fe1\u3092\u9632\u3044\u3067\u30a2\u30e9\u30fc\u30c8\u3092\u8868\u793a\u3057\u307e\u3059\u3002\n5. \u307e\u3068\u3081\nJavaScript\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u96fb\u5b50\u30d5\u30a9\u30fc\u30e0\u306e\u64cd\u4f5c\u6027\u3092\u5927\u5e45\u306b\u5411\u4e0a\u3055\u305b\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u30e6\u30fc\u30b6\u30fc\u304c\u30d5\u30a9\u30fc\u30e0\u3092\u5feb\u9069\u306b\u5229\u7528\u3067\u304d\u308b\u3088\u3046\u306b\u3001\u5165\u529b\u30d5\u30a3\u30fc\u30eb\u30c9\u306e\u79fb\u52d5\u3001\u30d0\u30ea\u30c7\u30fc\u30b7\u30e7\u30f3\u3001\u30a8\u30e9\u30fc\u8868\u793a\u3001\u9001\u4fe1\u306e\u5236\u5fa1\u306a\u3069\u3001\u3055\u307e\u3056\u307e\u306a\u8981\u7d20\u3092\u7d44\u307f\u5408\u308f\u305b\u3066\u3001\u3088\u308a\u52b9\u7387\u7684\u3067\u52b9\u679c\u7684\u306a\u30d5\u30a9\u30fc\u30e0\u3092\u4f5c\u6210\u3067\u304d\u307e\u3059\u3002\u3053\u306e\u3088\u3046\u306a\u6280\u8853\u3092\u99c6\u4f7f\u3059\u308b\u3053\u3068\u3067\u3001\u30e6\u30fc\u30b6\u30fc\u4f53\u9a13\u3092\u9ad8\u3081\u3001\u3088\u308a\u30b9\u30e0\u30fc\u30ba\u306a\u30d5\u30a9\u30fc\u30e0\u64cd\u4f5c\u304c\u53ef\u80fd\u306b\u306a\u308a\u307e\u3059\u3002","publisher":{"@id":"#Publisher","@type":"Organization","name":"\u6587\u5316","logo":{"@type":"ImageObject","url":"https:\/\/bunkao.com\/wp-content\/uploads\/2025\/11\/logo_bunkao123.png"}},"sourceOrganization":{"@id":"#Publisher"},"copyrightHolder":{"@id":"#Publisher"},"mainEntityOfPage":{"@type":"WebPage","@id":"https:\/\/bunkao.com\/javascript%e3%81%a7%e3%81%ae%e3%83%95%e3%82%a9%e3%83%bc%e3%83%a0%e6%93%8d%e4%bd%9c\/","breadcrumb":{"@id":"#Breadcrumb"}},"author":{"@type":"Person","name":"admin","url":"https:\/\/bunkao.com\/author\/admin\/"},"image":{"@type":"ImageObject","url":"https:\/\/bunkao.com\/wp-content\/uploads\/2025\/11\/logo.png","width":1200,"height":1004}}</script> 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