JavaScript addEventListener() ar piemēriem

JavaScript addEventListener() ar piemēriem

The metodi addEventListener(). no EventTarget saskarnes iestata funkciju, kas tiks izsaukta ikreiz, kad norādītais notikums tiks piegādāts mērķim. Šī metode ļauj elementā izmantot vairākus notikumu apdarinātājus, nodrošinot dinamisku un elastīgu mijiedarbības pārvaldību tīmekļa lietojumprogrammās.

Sintakse:

element.addEventListener(event, listener, useCapture); 

Parametri:

  • pasākums: notikums var būt jebkurš derīgs JavaScript notikums. Notikumi tiek izmantoti bez prefiksiem, piemēram, izmantojot klikšķi, nevis onclick vai mousedown, nevis onmousedown.
  • klausītājs (apdarinātāja funkcija): Tā var būt JavaScript funkcija, kas reaģē uz notiekošo notikumu.
  • useCapture: Tas ir izvēles parametrs, ko izmanto, lai kontrolētu notikumu izplatību. Būla vērtība tiek nodota kur taisnība apzīmē uztveršanas fāzi un viltus apzīmē burbuļošanas fāzi.

1. piemērs: Šajā piemērā mēs parādīsim tekstu tīmekļa lapā pēc noklikšķināšanas uz pogas.

HTML Documenttitle> head> <body> <button id='try'>Noklikšķiniet šeit pogas> <h1 id='text'>h1> <script>document.getElementById('try').addEventListener('click', function () { document.getElementById('text').innerText = 'techcodeview.com'; }); skripts> body> html>>> </tag> <p dir='ltr'> <b> <strong>Izvade: </strong> </b> <span> </span> </p> <img src='//techcodeview.com/img/javascript-methods/82/javascript-addeventlistener-with-examples.webp' alt='JavaScript addEventListener() ar piemēriem'> <p>JavaScript addEventListener() ar piemēriem </p> <p dir='ltr'> <br> <b> <strong>2. piemērs: </strong> </b> <span>Šajā piemērā vienam un tam pašam elementam ir pievienoti divi notikumi, kas novieto kursoru un novieto kursoru. Ja teksts tiek virzīts virs kursora, notiek peles novietošanas notikums un tiek izsaukta funkcija RespondMouseOver, līdzīgi kā peles izņemšanas notikumam tiek izsaukta funkcija RespondMouseOut. </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>Documenttitle> head> <body> <button id='clickIt'>Noklikšķiniet šeit pogas> <p id='hoverPara'>Virziet kursoru virs šī teksta !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' + ' '; 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