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@italia/rating

v1.0.0-alpha.6

Published

Web component it-rating del Design system .italia

Readme

<it-rating>

npm version

Web component per la valutazione con stelle (rating) del Design System Italia basato su Bootstrap Italia.

Installazione

npm install @italia/rating

Utilizzo Base

<script type="module">
  import '@italia/rating';
</script>

<it-rating name="rating" value="3">
  <span slot="legend">Valuta questo servizio</span>
</it-rating>

Con Label

<it-rating name="rating" value="4" label="Valutazione">
</it-rating>

Sola Lettura

<it-rating name="rating" value="4" read-only>
</it-rating>

Disabilitato

<it-rating name="rating" value="3" disabled>
  <span slot="legend">Valutazione</span>
</it-rating>

Obbligatorio

<form>
  <it-rating name="rating" required>
    <span slot="legend">Valuta questo contenuto (obbligatorio)</span>
  </it-rating>
  <button type="submit">Invia</button>
</form>

Proprietà

| Proprietà | Tipo | Default | Descrizione | |-----------|------|---------|-------------| | name | string | '' | Nome del campo per l'invio del form | | value | number | 0 | Valore corrente della valutazione (1-5) | | label | string | '' | Etichetta del rating | | disabled | boolean | false | Se il rating è disabilitato | | read-only | boolean | false | Se il rating è in sola lettura (non interattivo) | | required | boolean | false | Se la selezione è obbligatoria | | max-stars | number | 5 | Numero massimo di stelle |

Eventi

change

Emesso quando cambia il valore della valutazione.

const rating = document.querySelector('it-rating');
rating.addEventListener('change', (event) => {
  console.log('Nuovo valore:', event.detail.value);
});

Slot

legend

Contenuto della legend del fieldset (label del rating).

<it-rating name="rating">
  <span slot="legend">Valuta questo servizio</span>
</it-rating>

Accessibilità

Il componente implementa le best practice di accessibilità:

  • Utilizza role="radiogroup" per il gruppo di stelle
  • Ogni stella ha role="radio" (quando interattivo) o role="img" (quando read-only)
  • Supporto completo per la navigazione da tastiera:
    • Tab: entra/esce dal rating
    • Frecce: naviga tra le stelle
    • Home: vai alla prima stella
    • End: vai all'ultima stella
    • Spazio/Enter: seleziona la stella corrente
  • Etichette aria-label appropriate per ogni stella
  • Supporto per screen reader con testo nascosto visualmente

Integrazione con Form

Il componente si integra nativamente con i form HTML:

<form id="reviewForm">
  <it-rating name="rating" value="3" required>
    <span slot="legend">Valutazione</span>
  </it-rating>
  
  <button type="submit">Invia recensione</button>
</form>

<script>
  document.getElementById('reviewForm').addEventListener('submit', (e) => {
    e.preventDefault();
    const formData = new FormData(e.target);
    console.log('Rating:', formData.get('rating'));
  });
</script>

Validazione

Il componente supporta la validazione HTML5:

const rating = document.querySelector('it-rating');

// Verifica validità
if (rating.checkValidity()) {
  console.log('Rating valido');
}

// Mostra errori di validazione
rating.reportValidity();

Personalizzazione CSS

it-rating {
  --rating-star-size: 1.5rem;
  --rating-star-color: #ffc107;
  --rating-star-empty-color: #e0e0e0;
}

Browser Support

  • Chrome/Edge (ultimo + 1 versione precedente)
  • Firefox (ultimo + 1 versione precedente)
  • Safari (ultimo + 1 versione precedente)

Licenza

BSD-3-Clause © Presidenza del Consiglio dei Ministri