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JSX (JavaScript)
part 1/2 Β· 7.0 KB total
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JSX (JavaScript Syntax Extension oder gelegentlich JavaScript XML) ist eine Syntax-Erweiterung fΓΌr JavaScript (Syntaktischer Zucker).cite-ref-4[4] JSX wurde fΓΌr das Framework React entwickelt und wird als Auszeichnungssprache fΓΌr Komponenten verwendet.
Contents
β’ Syntax
β’ Attribute
β’ Sicherheit (XSS)
β’ Props in JSX
β’ Vue
β’ TSX
β’ Siehe auch
β’ Einzelnachweise
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Syntax
JSX ist in seiner Syntax Γ€hnlich zu Hypertext Markup Language, wie das folgende Beispiel zeigt:cite-ref-5[5]
const user = "Max Mustermann";
const element = (
<div>
<h1 className="greeting">Hallo, {user}</h1>
<a href="https://www.reactjs.org">link</a>
</div>
);
Beim Γbersetzen von JSX wird daraus der folgende React-JavaScript-Code mit erzeugt:cite-ref-6[6]
const user = "Max Mustermann";
const element = React.createElement("div", {}, [
React.createElement("h1", { className: "greeting" }, ["Hallo, ", user]),
React.createElement("a", { href: "https://www.reactjs.org" }, ["link"])
]);
const name = 'Max Mustermann';
const element = <h1>Hallo, {name}</h1>;
ReactDOM.render(
element,
document.getElementById('root')
);
Attribute
Man benutzt meistens AnfΓΌhrungszeichen um string-Literale als Attribute zu verwenden:
const element = <a href="https://www.wikipedia.org"> link </a>;
Ebenfalls kann man geschweifte Klammern verwenden, um JavaScript-AusdrΓΌcke in ein Attribut einzubinden:
const element = <img src={user.avatarUrl}></img>;
Sicherheit (XSS)
JSX verhindert Injection-Attacken wie Cross-Site-Scripting (XSS). Es ist sicher, Benutzereingaben wie diese einzubetten:
const title = response.potentiallyMaliciousInput;
// Dies ist sicher:
const element = <h1>{title}</h1>;
StandardmΓ€Γig entschlΓΌsselt React DOM alle in JSX eingebetteten Werte, bevor sie gerendert werden. Alles wird in eine Zeichenkette konvertiert, bevor es gerendert wird.cite-ref-10[10]
Props in JSX
Man kann einen beliebigen JavaScript-Ausdruck als Prop ΓΌbergeben, indem man ihn mit {} umgibt. Zum Beispiel in diesem Code:
<MyComponent foo={1 + 2 + 3 + 4} />
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