Co znamená javascript:void(0)?
V JavaScriptu je javascript:void(0) pseudo-URL, která po kliknutí nedělá nic. Běžně se používá jako zástupný symbol v atributech href, aby se zabránilo prohlížeči v navigaci na novou stránku a přitom stále spouští kód JavaScript.
Použití # v kotevní značce
Při psaní následujícího kódu v editoru se webová stránka po zobrazení výstražné zprávy obnoví.
Příklad:
html techcodeview.comtitle> <style>h1 { barva: zelená; } styl> hlava> <body> <h1>techcodeview.comh1> <h3>bez JavaScriptu:void(0)h3> <a href='#' ondblclick='alert('Welcome to Geeks for Geeks')'>Dvakrát klikněte na mě a> <a href='#' ondblclick='geeks()'>Dvakrát klikněte na mě a> <script>function geeks() { document.getElementById('gfg').innerHTML = 'Vítejte na techcodeview.com'; } skript> <p id='gfg'>p> body> html> </pre> </code> <p dir='ltr'> <b> <strong>Výstup: </strong> </b> <span> </span> </p> <img src='//techcodeview.com/img/javascript-questions/07/what-does-javascript.webp' alt='Co znamená javascript:void(0)?'> <p>Co znamená javascript:void(0)? </p> <h2> <b> <strong>Použití javascript:void(0); v kotevní značce </strong> </b> </h2> <p dir='ltr'> <span>Zápis javascript:void(0); v kotevní značce může zabránit opětovnému načtení stránky a funkce JavaScriptu lze snadno volat jediným nebo dvojitým kliknutím. </span> </p> <p dir='ltr'> <b> <strong>Příklad: </strong> </b> <span> </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>techcodeview.comtitle> <style>h1 { barva: zelená; } styl> hlava> <body> <h1>techcodeview.comh1> <h3>JavaScript:void(0)h3> <a href='javascript:void(0);' ondblclick='geek()'>Dvakrát klikněte na mě a> <p id='gfg'>p> <script>function geek() { document.getElementById('gfg').innerHTML = 'Vítejte na techcodeview.com'; } skript> tělo> html> </pre> </code> <p dir='ltr'> <b> <strong>Výstup: </strong> </b> <span> </span> </p> <img src='//techcodeview.com/img/javascript-questions/07/what-does-javascript-2.webp' alt='Co znamená javascript:void(0)?'> <p>Co znamená javascript:void(0)? </p> <br>
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