JavaScript addEventListener() と例
の addEventListener() メソッド EventTarget インターフェイスの関数は、指定されたイベントがターゲットに配信されるたびに呼び出される関数を設定します。この方法では、要素上で複数のイベント ハンドラーが可能になり、Web アプリケーション内で動的かつ柔軟な対話管理が可能になります。
構文：
element.addEventListener(event, listener, useCapture);
パラメーター：
- イベント： イベントには、任意の有効な JavaScript イベントを指定できます。イベントは、onclick の代わりに click を使用したり、onmousedown の代わりに Mousedown を使用したりするなど、on プレフィックスなしで使用されます。
- リスナー(ハンドラー関数): これは、発生したイベントに応答する JavaScript 関数にすることができます。
- 使用キャプチャ: これは、イベントの伝播を制御するために使用されるオプションのパラメーターです。ブール値が渡されます。 真実 はキャプチャフェーズを示し、 間違い はバブリング段階を示します。
例 1: この例では、ボタンをクリックした後に Web ページにテキストを表示します。
HTML ドキュメントのタイトル> 見出し> <body> <button id='try'>ここをクリックボタン> <h1 id='text'>h1> <script>document.getElementById('try').addEventListener('click', function () { document.getElementById('text').innerText = 'techcodeview.com'; }); スクリプト>本文>html>> </pre> </code> <p dir='ltr'> <b> <strong>出力： </strong> </b> <span> </span> </p> <img src='//techcodeview.com/img/javascript-methods/82/javascript-addeventlistener-with-examples.webp' alt='JavaScript addEventListener() と例'> <p>JavaScript addEventListener() と例 </p> <p dir='ltr'> <br> <b> <strong>例 2: </strong> </b> <span>この例では、mouseover と Mouseout という 2 つのイベントが同じ要素に追加されます。テキストがマウスオーバーされると、mouseover イベントが発生して RespondMouseOver 関数が呼び出されます。同様に、マウスアウト イベントの場合は RespondMouseOut 関数が呼び出されます。 </span> </p>HTML <code> <pre> <html lang='en'> <head> <meta charset='UTF-8'> <meta name='viewport' content='width=device-width, initial-scale=1.0'> <title>ドキュメントのタイトル> 見出し> <body> <button id='clickIt'>ここをクリックボタン> <p id='hoverPara'>このテキストの上にマウスを移動します !p> <b id='effect'>b> <script>const x = document.getElementById('clickIt'); const y = document.getElementById('hoverPara'); x.addEventListener('click', RespondClick); y.addEventListener('mouseover', RespondMouseOver); y.addEventListener('mouseout', RespondMouseOut); function RespondMouseOver() { document.getElementById('effect').innerHTML += 'MouseOver Event' + ' '; } function RespondMouseOut() { document.getElementById('effect').innerHTML += 'MouseOut Event' + ' '; } function RespondClick() { document.getElementById('effect').innerHTML += 'クリック イベント' + ' '; } スクリプト>本体>html>> </pre> </code> <p dir='ltr'> <b> <strong>出力： </strong> </b> <span> </span> </p> <img src='//techcodeview.com/img/javascript-methods/82/javascript-addeventlistener-with-examples-2.webp' alt='JavaScript addEventListener() と例'> <p>JavaScript addEventListener() と例 </p> <br> <br>
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