May 2012
Intermediate to advanced
280 pages
5h 36m
German
Content preview from HTML5 & CSS3 (Prags)Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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11.6 Clientseitige Formularvalidierung
Die HTML-Spezifikation sieht mehrere Attribute vor, über die wir clientseitig Benutzereingaben validieren können. Auf diese Weise können wir einfache Eingabefehler abfangen, bevor der Benutzer die Anfrage an den Server schickt. Mit JavaScript geht das schon seit Jahren, aber in HTML5-Formularen können wir jetzt neue Attribute verwenden, um das gewünschte Verhalten festzulegen.
Mit dem Attribut required können wir sicherstellen, dass Benutzer erforderliche Formularfelder ausfüllen:
html5validation/index.html
<label for="name">Name</label> <input type="text" name="name" autofocus required id="name">
Falls das Feld leer ist, kann der Browser die Übermittlung des Formulars verhindern und eine hübsche Fehlermeldung ...
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