JavaScript addEventListener() s příklady
The metoda addEventListener(). rozhraní EventTarget nastaví funkci, která bude volána vždy, když je zadaná událost doručena do cíle. Tato metoda umožňuje více obslužných rutin událostí na prvku, což umožňuje dynamickou a flexibilní správu interakcí v rámci webových aplikací.
Syntax:
element.addEventListener(event, listener, useCapture);
Parametry:
- událost: událost může být jakákoli platná událost JavaScriptu. Události se používají bez předpon, jako je použití click namísto onclick nebo mousedown místo onmousedown.
- posluchač (funkce obsluhy): Může to být funkce JavaScriptu, která reaguje na nastalou událost.
- použít Capture: Je to volitelný parametr používaný k řízení šíření událostí. Kde je předána booleovská hodnota skutečný označuje fázi zachycení a Nepravdivé označuje fázi bublání.
Příklad 1: V tomto příkladu zobrazíme text na webové stránce po kliknutí na tlačítko.
HTML Název dokumentu> hlava> <body> <button id='try'>Klikněte zdetlačítko> <h1 id='text'>h1> <script>document.getElementById('try').addEventListener('kliknutí', funkce () { document.getElementById('text').innerText = 'techcodeview.com'; }); skript> tělo> html> </pre> </code> <p dir='ltr'> <b> <strong>Výstup: </strong> </b> <span> </span> </p> <img src='//techcodeview.com/img/javascript-methods/82/javascript-addeventlistener-with-examples.webp' alt='JavaScript addEventListener() s příklady'> <p>JavaScript addEventListener() s příklady </p> <p dir='ltr'> <br> <b> <strong>Příklad 2: </strong> </b> <span>V tomto příkladu jsou ke stejnému prvku přidány dvě události mouseover a mouseout. Pokud je text umístěn nad textem, dojde k události mouseover a vyvolá se funkce RespondMouseOver, podobně pro událost mouseout je vyvolána funkce 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>Název dokumentu> hlava> <body> <button id='clickIt'>Klikněte zdetlačítko> <p id='hoverPara'>Najeďte myší na tento 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('effect').innerHTML += 'MouseOver Event' + ' '; } function RespondMouseOut() { document.getElementById('effect').innerHTML += 'MouseOut Event' + ' '; } function RespondClick() { document.getElementById('effect').innerHTML += 'Událost kliknutí' + ' '; } skript> tělo> html> </pre> </code> <p dir='ltr'> <b> <strong>Výstup: </strong> </b> <span> </span> </p> <img src='//techcodeview.com/img/javascript-methods/82/javascript-addeventlistener-with-examples-2.webp' alt='JavaScript addEventListener() s příklady'> <p>JavaScript addEventListener() s příklady </p> <br> <br>
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