JavaScript addEventListener() con ejemplos
El método addEventListener() de la interfaz EventTarget configura una función que se llamará cada vez que el evento especificado se entregue al objetivo. Este método permite múltiples controladores de eventos en un elemento, lo que permite una gestión de interacción dinámica y flexible dentro de las aplicaciones web.
Sintaxis:
element.addEventListener(event, listener, useCapture);
Parámetros:
- evento: El evento puede ser cualquier evento de JavaScript válido. Los eventos se usan sin prefijos, como usar click en lugar de onclick o mousedown en lugar de onmousedown.
- oyente (función de controlador): Puede ser una función de JavaScript que responde al evento que ocurre.
- utilizarCaptura: Es un parámetro opcional que se utiliza para controlar la propagación de eventos. Se pasa un valor booleano donde verdadero denota la fase de captura y FALSO denota la fase de burbujeo.
Ejemplo 1: En este ejemplo, mostraremos texto en la página web después de hacer clic en el botón.
HTML Título del documento> encabezado> <body> <button id='try'>Haga clic aquí botón> <h1 id='text'>h1> <script>document.getElementById('try').addEventListener('click', function () { document.getElementById('text').innerText = 'techcodeview.com'; }); secuencia de comandos> cuerpo> html> </pre> </code> <p dir='ltr'> <b> <strong>Producción: </strong> </b> <span> </span> </p> <img src='//techcodeview.com/img/javascript-methods/82/javascript-addeventlistener-with-examples.webp' alt='JavaScript addEventListener() con ejemplos'> <p>JavaScript addEventListener() con ejemplos </p> <p dir='ltr'> <br> <b> <strong>Ejemplo 2: </strong> </b> <span>En este ejemplo, se agregan dos eventos mouseover y mouseout al mismo elemento. Si se pasa el cursor sobre el texto, se produce el evento de mouseover y se invoca la función RespondMouseOver, de manera similar, para el evento de mouseout, se invoca la función 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>Título del documento> encabezado> <body> <button id='clickIt'>Haga clic aquí botón> <p id='hoverPara'>Pase el cursor sobre este texto!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); función RespondMouseOver() { document.getElementById('effect').innerHTML += 'MouseOver Event' + ' '; } función RespondMouseOut() { document.getElementById('effect').innerHTML += 'MouseOut Event' + ' '; } function RespondClick() { document.getElementById('effect').innerHTML += 'Evento de clic' + ' '; } script> cuerpo> html> </pre> </code> <p dir='ltr'> <b> <strong>Producción: </strong> </b> <span> </span> </p> <img src='//techcodeview.com/img/javascript-methods/82/javascript-addeventlistener-with-examples-2.webp' alt='JavaScript addEventListener() con ejemplos'> <p>JavaScript addEventListener() con ejemplos </p> <br> <br>
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