JavaScript addEventListener() cu exemple
The metoda addEventListener(). al interfeței EventTarget setează o funcție care va fi apelată ori de câte ori evenimentul specificat este livrat țintei. Această metodă permite gestionarea mai multor evenimente pe un element, permițând gestionarea interacțiunii dinamice și flexibile în cadrul aplicațiilor web.
Sintaxă:
element.addEventListener(event, listener, useCapture);
Parametri:
- eveniment: evenimentul poate fi orice eveniment JavaScript valid. Evenimentele sunt folosite fără prefixe, cum ar fi folosirea click în loc de onclick sau mousedown în loc de onmousedown.
- ascultător (funcție de gestionare): Poate fi o funcție JavaScript care răspunde la evenimentul care are loc.
- useCapture: Este un parametru opțional utilizat pentru a controla propagarea evenimentului. O valoare booleană este transmisă unde Adevărat denota faza de captare si fals denotă faza de barbotare.
Exemplul 1: În acest exemplu, vom afișa text pe pagina web după ce facem clic pe butonul.
HTML Titlu document> cap> <body> <button id='try'>Faceți clic aicibutton> <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>Ieșire: </strong> </b> <span> </span> </p> <img src='//techcodeview.com/img/javascript-methods/82/javascript-addeventlistener-with-examples.webp' alt='JavaScript addEventListener() cu exemple'> <p>JavaScript addEventListener() cu exemple </p> <p dir='ltr'> <br> <b> <strong>Exemplul 2: </strong> </b> <span>În acest exemplu, două evenimente mouseover și mouseout sunt adăugate la același element. Dacă textul este trecut cu mouse-ul, apare evenimentul mouseover și funcția RespondMouseOver este invocată, în mod similar pentru evenimentul mouseout, funcția RespondMouseOut este invocată. </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>Titlu document> cap> <body> <button id='clickIt'>Faceți clic aicibutton> <p id='hoverPara'>Plasați cursorul peste acest text !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('efect').innerHTML += 'MouseOver Event' + ' '; } function RespondMouseOut() { document.getElementById('efect').innerHTML += 'MouseOut Event' + ' '; } function RespondClick() { document.getElementById('efect').innerHTML += 'Click Event' + ' '; } script> body> html>> </pre> </code> <p dir='ltr'> <b> <strong>Ieșire: </strong> </b> <span> </span> </p> <img src='//techcodeview.com/img/javascript-methods/82/javascript-addeventlistener-with-examples-2.webp' alt='JavaScript addEventListener() cu exemple'> <p>JavaScript addEventListener() cu exemple </p> <br> <br>
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