JavaScript addEventListener() z przykładami
The metoda addEventListener(). interfejsu EventTarget konfiguruje funkcję, która będzie wywoływana za każdym razem, gdy określone zdarzenie zostanie dostarczone do celu. Ta metoda umożliwia obsługę wielu zdarzeń w elemencie, umożliwiając dynamiczne i elastyczne zarządzanie interakcjami w aplikacjach internetowych.
Składnia:
element.addEventListener(event, listener, useCapture);
Parametry:
- wydarzenie: zdarzenie może być dowolnym prawidłowym zdarzeniem JavaScript. Zdarzenia są używane bez przedrostków on, np. przy użyciu kliknięcia zamiast onclick lub myszy w dół zamiast onmousedown.
- słuchacz (funkcja obsługi): Może to być funkcja JavaScript reagująca na zachodzące zdarzenie.
- użyjPrzechwytywania: Jest to opcjonalny parametr używany do kontrolowania propagacji zdarzeń. Gdzie przekazywana jest wartość logiczna PRAWDA oznacza fazę przechwytywania i FAŁSZ oznacza fazę bulgotania.
Przykład 1: W tym przykładzie po kliknięciu w przycisk wyświetlimy tekst na stronie.
HTML Tytuł dokumentu> głowa> <body> <button id='try'>Kliknij tutajprzycisk> <h1 id='text'>h1> <script>document.getElementById('try').addEventListener('click', funkcja () { document.getElementById('text').innerText = 'techcodeview.com'; }); skrypt> treść> html> </pre> </code> <p dir='ltr'> <b> <strong>Wyjście: </strong> </b> <span> </span> </p> <img src='//techcodeview.com/img/javascript-methods/82/javascript-addeventlistener-with-examples.webp' alt='JavaScript addEventListener() z przykładami'> <p>JavaScript addEventListener() z przykładami </p> <p dir='ltr'> <br> <b> <strong>Przykład 2: </strong> </b> <span>W tym przykładzie do tego samego elementu dodano dwa zdarzenia Mouseover i Mouseout. Po najechaniu na tekst następuje zdarzenie najechania myszką i wywołana zostaje funkcja RespondMouseOver, analogicznie w przypadku zdarzenia Mouseout wywoływana jest funkcja RespondMouseOut. </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>Tytuł dokumentu> głowa> <body> <button id='clickIt'>Kliknij tutajprzycisk> <p id='hoverPara'>Najedź kursorem na ten tekst!p> <b id='effect'>b> <script>const x = document.getElementById('clickIt'); const y = document.getElementById('hoverPara'); x.addEventListener('kliknięcie', RespondClick); y.addEventListener('mouseover', RespondMouseOver); y.addEventListener('mouseout', RespondMouseOut); funkcja RespondMouseOver() { document.getElementById('effect').innerHTML += 'MouseOver Event' + ' '; } funkcja RespondMouseOut() { document.getElementById('effect').innerHTML += 'MouseOut Event' + ' '; } funkcja RespondClick() { document.getElementById('effect').innerHTML += 'Zdarzenie kliknięcia' + ' '; } skrypt> treść> html> </pre> </code> <p dir='ltr'> <b> <strong>Wyjście: </strong> </b> <span> </span> </p> <img src='//techcodeview.com/img/javascript-methods/82/javascript-addeventlistener-with-examples-2.webp' alt='JavaScript addEventListener() z przykładami'> <p>JavaScript addEventListener() z przykładami </p> <br> <br>
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