JavaScript addEventListener() med eksempler
Det addEventListener() metode af EventTarget-grænsefladen opsætter en funktion, der vil blive kaldt, når den angivne hændelse leveres til målet. Denne metode tillader flere hændelseshandlere på et element, hvilket muliggør dynamisk og fleksibel interaktionsstyring inden for webapplikationer.
Syntaks:
element.addEventListener(event, listener, useCapture);
Parametre:
- begivenhed: begivenhed kan være enhver gyldig JavaScript-begivenhed. Hændelser bruges uden på præfikser som at bruge klik i stedet for onclick eller mousedown i stedet for onmousedown.
- lytter(handlerfunktion): Det kan være en JavaScript-funktion, der reagerer på hændelsen.
- useCapture: Det er en valgfri parameter, der bruges til at styre hændelsesudbredelse. En boolesk værdi sendes hvor rigtigt betegner indfangningsfasen og falsk betegner boblende fase.
Eksempel 1: I dette eksempel vil vi vise tekst på websiden efter at have klikket på knappen.
HTML Dokumenttitel> hoved> <body> <button id='try'>Klik her knap> <h1 id='text'>h1> <script>document.getElementById('try').addEventListener('klik', funktion () { document.getElementById('text').innerText = 'techcodeview.com'; }); script> body> html> </pre> </code> <p dir='ltr'> <b> <strong>Produktion: </strong> </b> <span> </span> </p> <img src='//techcodeview.com/img/javascript-methods/82/javascript-addeventlistener-with-examples.webp' alt='JavaScript addEventListener() med eksempler'> <p>JavaScript addEventListener() med eksempler </p> <p dir='ltr'> <br> <b> <strong>Eksempel 2: </strong> </b> <span>I dette eksempel føjes to begivenheder mouseover og mouseout til det samme element. Hvis teksten holdes over, opstår mouseover-hændelsen, og funktionen RespondMouseOver påkaldes, på samme måde for mouseout-hændelsen. </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> hoved> <body> <button id='clickIt'>Klik her knap> <p id='hoverPara'>Hold markøren over denne tekst !p> <b id='effect'>b> <script>const x = document.getElementById('klik på det'); const y = document.getElementById('hoverPara'); x.addEventListener('klik', RespondClick); y.addEventListener('mouseover', RespondMouseOver); y.addEventListener('mouseout', RespondMouseOut); function RespondMouseOver() { document.getElementById('effect').innerHTML += 'MouseOver Event' + ' '; } funktion RespondMouseOut() { document.getElementById('effect').innerHTML += 'MouseOut Event' + ' '; } funktion RespondClick() { document.getElementById('effect').innerHTML += 'Click Event' + ' '; } script> body> html> </pre> </code> <p dir='ltr'> <b> <strong>Produktion: </strong> </b> <span> </span> </p> <img src='//techcodeview.com/img/javascript-methods/82/javascript-addeventlistener-with-examples-2.webp' alt='JavaScript addEventListener() med eksempler'> <p>JavaScript addEventListener() med eksempler </p> <br> <br>
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