JavaScript addEventListener() ja esimerkkejä
The addEventListener() -menetelmä EventTarget-rajapinnassa määrittää toiminnon, jota kutsutaan aina, kun määritetty tapahtuma toimitetaan kohteeseen. Tämä menetelmä sallii useita tapahtumakäsittelijöitä elementissä, mikä mahdollistaa dynaamisen ja joustavan vuorovaikutuksen hallinnan verkkosovelluksissa.
Syntaksi:
element.addEventListener(event, listener, useCapture);
Parametrit:
- tapahtuma: tapahtuma voi olla mikä tahansa kelvollinen JavaScript-tapahtuma. Tapahtumia käytetään ilman etuliitteitä, kuten klikkaus onclickin sijaan tai mousedown onmousedown sijaan.
- kuuntelija (käsittelijätoiminto): Se voi olla JavaScript-funktio, joka reagoi tapahtuvaan tapahtumaan.
- useCapture: Se on valinnainen parametri, jota käytetään ohjaamaan tapahtuman etenemistä. Boolen arvo välitetään missä totta tarkoittaa sieppausvaihetta ja väärä tarkoittaa kuplimisvaihetta.
Esimerkki 1: Tässä esimerkissä näytämme tekstiä verkkosivulla painikkeen napsautuksen jälkeen.
HTML Asiakirjan nimi> head> <body> <button id='try'>Napsauta tästäpainiketta> <h1 id='text'>h1> <script>document.getElementById('try').addEventListener('click', function () { document.getElementById('text').innerText = 'techcodeview.com'; }); script> body> html>>> </tag> <p dir='ltr'> <b> <strong>Lähtö: </strong> </b> <span> </span> </p> <img src='//techcodeview.com/img/javascript-methods/82/javascript-addeventlistener-with-examples.webp' alt='JavaScript addEventListener() ja esimerkkejä'> <p>JavaScript addEventListener() ja esimerkkejä </p> <p dir='ltr'> <br> <b> <strong>Esimerkki 2: </strong> </b> <span>Tässä esimerkissä samaan elementtiin lisätään kaksi tapahtumaa hiiren osoitin ja hiiri pois. Jos teksti viedään hiiren päälle, tapahtuu hiiren siirtotapahtuma ja RespondMouseOver-toiminto kutsutaan, samoin mouseout-tapahtumalle RespondMouseOut-toiminto. </span> </p>HTML <tag data-text-1=' <html lang='en'> <head> <meta charset='UTF-8'> <meta name='viewport' content='width=device-width, initial-scale=1.0'> <title>Asiakirjan nimi> head> <body> <button id='clickIt'>Napsauta tästäpainiketta> <p id='hoverPara'>Vie hiiri tämän tekstin päälle !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 += 'Klikkaustapahtuma' + ' '; } script> body> html> </pre> </code> <p dir='ltr'> <b> <strong>Lähtö: </strong> </b> <span> </span> </p> <img src='//techcodeview.com/img/javascript-methods/82/javascript-addeventlistener-with-examples-2.webp' alt='JavaScript addEventListener() ja esimerkkejä'> <p>JavaScript addEventListener() ja esimerkkejä </p> <br> <br>
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