JavaScript addEventListener() avec exemples
Le Méthode addEventListener() de l'interface EventTarget configure une fonction qui sera appelée chaque fois que l'événement spécifié est transmis à la cible. Cette méthode autorise plusieurs gestionnaires d'événements sur un élément, permettant une gestion dynamique et flexible des interactions au sein des applications Web.
Syntaxe:
element.addEventListener(event, listener, useCapture);
Paramètres:
- événement: event peut être n’importe quel événement JavaScript valide. Les événements sont utilisés sans préfixes on, comme utiliser click au lieu de onclick ou mousedown au lieu de onmousedown.
- écouteur (fonction de gestionnaire): Il peut s'agir d'une fonction JavaScript qui répond à l'événement qui se produit.
- utiliserCapture : Il s'agit d'un paramètre facultatif utilisé pour contrôler la propagation des événements. Une valeur booléenne est passée là où vrai désigne la phase de capture et FAUX désigne la phase de bouillonnement.
Exemple 1: Dans cet exemple, nous afficherons du texte sur la page Web après avoir cliqué sur le bouton.
HTML Titre du document> tête> <body> <button id='try'>Cliquez icibouton> <h1 id='text'>h1> <script>document.getElementById('try').addEventListener('click', function () { document.getElementById('text').innerText = 'techcodeview.com'; }); script> corps> html> </pre> </code> <p dir='ltr'> <b> <strong>Sortir: </strong> </b> <span> </span> </p> <img src='//techcodeview.com/img/javascript-methods/82/javascript-addeventlistener-with-examples.webp' alt='JavaScript addEventListener() avec exemples'> <p>JavaScript addEventListener() avec exemples </p> <p dir='ltr'> <br> <b> <strong>Exemple 2 : </strong> </b> <span>Dans cet exemple, deux événements mouseover et mouseout sont ajoutés au même élément. Si le texte est survolé, l'événement mouseover se produit et la fonction RespondMouseOver est invoquée, de même pour l'événement mouseout, la fonction RespondMouseOut est invoquée. </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>Titre du document> tête> <body> <button id='clickIt'>Cliquez icibouton> <p id='hoverPara'>Passez la souris sur ce texte !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> corps> html> </pre> </code> <p dir='ltr'> <b> <strong>Sortir: </strong> </b> <span> </span> </p> <img src='//techcodeview.com/img/javascript-methods/82/javascript-addeventlistener-with-examples-2.webp' alt='JavaScript addEventListener() avec exemples'> <p>JavaScript addEventListener() avec exemples </p> <br> <br>
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