JavaScript addEventListener() amb exemples
El mètode addEventListener(). de la interfície EventTarget configura una funció que es cridarà sempre que l'esdeveniment especificat s'entregui a l'objectiu. Aquest mètode permet gestionar múltiples esdeveniments en un element, permetent una gestió de la interacció dinàmica i flexible dins de les aplicacions web.
Sintaxi:
element.addEventListener(event, listener, useCapture);
Paràmetres:
- esdeveniment: L'esdeveniment pot ser qualsevol esdeveniment JavaScript vàlid. Els esdeveniments s'utilitzen sense prefixos com ara fer clic en lloc d'onclick o amb el ratolí cap avall en lloc d'onmousedown.
- oient (funció de gestor): Pot ser una funció JavaScript que respongui a l'esdeveniment que es produeix.
- useCapture: És un paràmetre opcional utilitzat per controlar la propagació d'esdeveniments. Es passa un valor booleà on veritat denota la fase de captura i fals indica la fase de bombolla.
Exemple 1: En aquest exemple, mostrarem text a la pàgina web després de fer clic al botó.
HTML Títol del document> capçalera> <body> <button id='try'>Feu clic aquíbotó> <h1 id='text'>h1> <script>document.getElementById('try').addEventListener('clic', funció () { document.getElementById('text').innerText = 'techcodeview.com'; }); script> body> html>> </pre> </code> <p dir='ltr'> <b> <strong>Sortida: </strong> </b> <span> </span> </p> <img src='//techcodeview.com/img/javascript-methods/82/javascript-addeventlistener-with-examples.webp' alt='JavaScript addEventListener() amb exemples'> <p>JavaScript addEventListener() amb exemples </p> <p dir='ltr'> <br> <b> <strong>Exemple 2: </strong> </b> <span>En aquest exemple, s'afegeixen dos esdeveniments sobre el ratolí i el pas del ratolí al mateix element. Si es passa el ratolí per sobre, es produeix l'esdeveniment mouseover i s'invoca la funció RespondMouseOver, de la mateixa manera per a l'esdeveniment mouseout s'invoca la funció 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>Títol del document> capçalera> <body> <button id='clickIt'>Feu clic aquíbotó> <p id='hoverPara'>Passeu el cursor per sobre d'aquest text !p> <b id='effect'>b> <script>const x = document.getElementById('clickIt'); const y = document.getElementById('hoverPara'); x.addEventListener('clic', RespondClick); y.addEventListener('mouseover', RespondMouseOver); y.addEventListener('mouseout', RespondMouseOut); function RespondMouseOver() { document.getElementById('effect').innerHTML += 'Esdeveniment MouseOver' + ' '; } function RespondMouseOut() { document.getElementById('effect').innerHTML += 'Esdeveniment MouseOut' + ' '; } function RespondClick() { document.getElementById('effect').innerHTML += 'Click Event' + ' '; } script> body> html>> </pre> </code> <p dir='ltr'> <b> <strong>Sortida: </strong> </b> <span> </span> </p> <img src='//techcodeview.com/img/javascript-methods/82/javascript-addeventlistener-with-examples-2.webp' alt='JavaScript addEventListener() amb exemples'> <p>JavaScript addEventListener() amb exemples </p> <br> <br>
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