JavaScript addEventListener() s príkladmi
The metóda addEventListener(). rozhrania EventTarget nastaví funkciu, ktorá sa bude volať vždy, keď je určená udalosť doručená do cieľa. Táto metóda umožňuje viacero obsluhovačov udalostí na prvku, čo umožňuje dynamickú a flexibilnú správu interakcií v rámci webových aplikácií.
Syntax:
element.addEventListener(event, listener, useCapture);
Parametre:
- udalosť: udalosť môže byť akákoľvek platná udalosť JavaScript. Udalosti sa používajú bez predpon, ako je použitie kliknutia namiesto onclick alebo mousedown namiesto onmousedown.
- poslucháč (funkcia obsluhy): Môže to byť funkcia JavaScript, ktorá reaguje na udalosť.
- použiť Capture: Je to voliteľný parameter používaný na riadenie šírenia udalosti. Kde sa odovzdá boolovská hodnota pravda označuje fázu zachytávania a falošné označuje fázu bublania.
Príklad 1: V tomto príklade zobrazíme text na webovej stránke po kliknutí na tlačidlo.
HTML Názov dokumentu> hlava> <body> <button id='try'>Kliknite semtlačidlo> <h1 id='text'>h1> <script>document.getElementById('try').addEventListener('kliknutie', funkcia () { document.getElementById('text').innerText = 'techcodeview.com'; }); script> body> html> </pre> </code> <p dir='ltr'> <b> <strong>Výkon: </strong> </b> <span> </span> </p> <img src='//techcodeview.com/img/javascript-methods/82/javascript-addeventlistener-with-examples.webp' alt='JavaScript addEventListener() s príkladmi'> <p>JavaScript addEventListener() s príkladmi </p> <p dir='ltr'> <br> <b> <strong>Príklad 2: </strong> </b> <span>V tomto príklade sa k tomu istému prvku pridajú dve udalosti prejdenia myšou a prejdenia myšou. Ak nad textom umiestnite kurzor myši, dôjde k udalosti prejdenia myšou a vyvolá sa funkcia RespondMouseOver, podobne ako pri udalosti ukončenia myšou sa vyvolá funkcia RespondMouseOut. </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>Názov dokumentu> hlava> <body> <button id='clickIt'>Kliknite semtlačidlo> <p id='hoverPara'>Umiestnite kurzor myši na tento text !p> <b id='effect'>b> <script>const x = document.getElementById('clickIt'); const y = document.getElementById('hoverPara'); x.addEventListener('kliknutie', 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 += 'Udalosť kliknutia' + ' '; } skript> telo> html> </pre> </code> <p dir='ltr'> <b> <strong>Výkon: </strong> </b> <span> </span> </p> <img src='//techcodeview.com/img/javascript-methods/82/javascript-addeventlistener-with-examples-2.webp' alt='JavaScript addEventListener() s príkladmi'> <p>JavaScript addEventListener() s príkladmi </p> <br> <br>
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