JavaScript addEventListener() mit Beispielen
Der addEventListener()-Methode der EventTarget-Schnittstelle richtet eine Funktion ein, die immer dann aufgerufen wird, wenn das angegebene Ereignis an das Ziel übermittelt wird. Diese Methode ermöglicht mehrere Event-Handler für ein Element und ermöglicht so ein dynamisches und flexibles Interaktionsmanagement innerhalb von Webanwendungen.
Syntax:
element.addEventListener(event, listener, useCapture);
Parameter:
- Ereignis: Ereignis kann jedes gültige JavaScript-Ereignis sein. Ereignisse werden ohne On-Präfixe verwendet, z. B. mit click anstelle von onclick oder mit mousedown anstelle von onmousedown.
- Listener (Handlerfunktion): Es kann sich um eine JavaScript-Funktion handeln, die auf das auftretende Ereignis reagiert.
- useCapture: Es handelt sich um einen optionalen Parameter, der zur Steuerung der Ereignisweitergabe verwendet wird. Wo wird ein boolescher Wert übergeben WAHR bezeichnet die Erfassungsphase und FALSCH bezeichnet die Blasenphase.
Beispiel 1: In diesem Beispiel zeigen wir Text auf der Webseite an, nachdem wir auf die Schaltfläche geklickt haben.
HTML Dokumenttitel> Kopf> <body> <button id='try'>Klicken Sie hierSchaltfläche> <h1 id='text'>h1> <script>document.getElementById('try').addEventListener('click', function () { document.getElementById('text').innerText = 'techcodeview.com'; }); script> body> html> </pre> </code> <p dir='ltr'> <b> <strong>Ausgabe: </strong> </b> <span> </span> </p> <img src='//techcodeview.com/img/javascript-methods/82/javascript-addeventlistener-with-examples.webp' alt='JavaScript addEventListener() mit Beispielen'> <p>JavaScript addEventListener() mit Beispielen </p> <p dir='ltr'> <br> <b> <strong>Beispiel 2: </strong> </b> <span>In diesem Beispiel werden zwei Ereignisse „Mouseover“ und „Mouseout“ zum selben Element hinzugefügt. Wenn der Mauszeiger über den Text bewegt wird, tritt ein Mouseover-Ereignis auf und die RespondMouseOver-Funktion wird aufgerufen, ebenso wird für das Mouseout-Ereignis die RespondMouseOut-Funktion aufgerufen. </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>Dokumenttitel> Kopf> <body> <button id='clickIt'>Klicken Sie hierSchaltfläche> <p id='hoverPara'>Bewegen Sie den Mauszeiger über diesen Text !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 += 'Click Event' + ' '; } script> body> html> </pre> </code> <p dir='ltr'> <b> <strong>Ausgabe: </strong> </b> <span> </span> </p> <img src='//techcodeview.com/img/javascript-methods/82/javascript-addeventlistener-with-examples-2.webp' alt='JavaScript addEventListener() mit Beispielen'> <p>JavaScript addEventListener() mit Beispielen </p> <br> <br>
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