JavaScript addEventListener() med eksempler
De addEventListener()-metoden av EventTarget-grensesnittet setter opp en funksjon som vil bli kalt når den angitte hendelsen leveres til målet. Denne metoden tillater flere hendelsesbehandlere på et element, noe som muliggjør dynamisk og fleksibel interaksjonsadministrasjon i webapplikasjoner.
Syntaks:
element.addEventListener(event, listener, useCapture);
Parametere:
- begivenhet: hendelse kan være en hvilken som helst gyldig JavaScript-hendelse. Hendelser brukes uten på prefikser som å bruke klikk i stedet for onclick eller mousedown i stedet for onmousedown.
- lytter (behandlerfunksjon): Det kan være en JavaScript-funksjon som reagerer på hendelsen som inntreffer.
- useCapture: Det er en valgfri parameter som brukes til å kontrollere utbredelse av hendelser. En boolsk verdi sendes hvor ekte betegner fangstfasen og falsk betegner boblefasen.
Eksempel 1: I dette eksemplet vil vi vise tekst på nettsiden etter å ha klikket på knappen.
HTML Dokumenttittel> hode> <body> <button id='try'>Klikk her-knappen> <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>Produksjon: </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 eksemplet legges to hendelser mouseover og mouseout til det samme elementet. Hvis teksten holdes over, oppstår mouseover-hendelse og RespondMouseOver-funksjonen påkalles, på samme måte for mouseout-hendelse. RespondMouseOut-funksjonen påkalles. </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>Dokumenttittel> hode> <body> <button id='clickIt'>Klikk her-knappen> <p id='hoverPara'>Hold markøren over denne teksten !p> <b id='effect'>b> <script>const x = document.getElementById('clickIt'); const y = document.getElementById('hoverPara'); x.addEventListener('klikk', RespondClick); y.addEventListener('mouseover', RespondMouseOver); y.addEventListener('mouseout', RespondMouseOut); function RespondMouseOver() { document.getElementById('effect').innerHTML += 'MouseOver Event' + ' '; } funksjonen RespondMouseOut() { document.getElementById('effect').innerHTML += 'MouseOut Event' + ' '; } funksjonen RespondClick() { document.getElementById('effect').innerHTML += 'Klikk Event' + ' '; } script> body> html> </pre> </code> <p dir='ltr'> <b> <strong>Produksjon: </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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