JavaScript addEventListener() med exempel
De addEventListener() metod i EventTarget-gränssnittet ställer in en funktion som kommer att anropas när den angivna händelsen levereras till målet. Denna metod tillåter flera händelsehanterare på ett element, vilket möjliggör dynamisk och flexibel interaktionshantering inom webbapplikationer.
Syntax:
element.addEventListener(event, listener, useCapture);
Parametrar:
- händelse: händelse kan vara vilken som helst giltig JavaScript-händelse. Händelser används utan på prefix som att använda klicka istället för onclick eller mousedown istället för onmousedown.
- lyssnare (hanterarfunktion): Det kan vara en JavaScript-funktion som svarar på händelsen som inträffar.
- useCapture: Det är en valfri parameter som används för att kontrollera händelseutbredning. Ett booleskt värde skickas där Sann betecknar fångstfasen och falsk betecknar bubblingsfasen.
Exempel 1: I det här exemplet kommer vi att visa text på webbsidan efter att ha klickat på knappen.
HTML Documenttitle> head> <body> <button id='try'>Klicka här 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>Produktion: </strong> </b> <span> </span> </p> <img src='//techcodeview.com/img/javascript-methods/82/javascript-addeventlistener-with-examples.webp' alt='JavaScript addEventListener() med exempel'> <p>JavaScript addEventListener() med exempel </p> <p dir='ltr'> <br> <b> <strong>Exempel 2: </strong> </b> <span>I det här exemplet läggs två händelser mouseover och mouseout till samma element. Om texten hålls över inträffar mouseover-händelse och funktionen RespondMouseOver anropas, på samma sätt för mouseout-händelse funktionen RespondMouseOut anropas. </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>Documenttitle> head> <body> <button id='clickIt'>Klicka här knappen> <p id='hoverPara'>Håll muspekaren över denna text !p> <b id='effect'>b> <script>const x = document.getElementById('clickIt'); const y = document.getElementById('hoverPara'); x.addEventListener('klick', 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('effekt').innerHTML += 'Klickhändelse' + ' '; } 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 exempel'> <p>JavaScript addEventListener() med exempel </p> <br> <br>
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