If you have multiple type="radio"
or type="checkbox"
inputs relating to the same value, you can use bind:group
along with the value
attribute. Radio inputs in the same group are mutually exclusive; checkbox inputs in the same group form an array of selected values.
Add bind:group={scoops}
to the radio inputs...
App
<input
type="radio"
name="scoops"
value={number}
bind:group={scoops}
/>
...and bind:group={flavours}
to the checkbox inputs:
App
<input
type="checkbox"
name="flavours"
value={flavour}
bind:group={flavours}
/>
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<script>
let scoops = $state(1);
let flavours = $state([]);
const formatter = new Intl.ListFormat('en', { style: 'long', type: 'conjunction' });
</script>
<h2>Size</h2>
{#each [1, 2, 3] as number}
<label>
<input
type="radio"
name="scoops"
value={number}
/>
{number} {number === 1 ? 'scoop' : 'scoops'}
</label>
{/each}
<h2>Flavours</h2>
{#each ['cookies and cream', 'mint choc chip', 'raspberry ripple'] as flavour}
<label>
<input
type="checkbox"
name="flavours"
value={flavour}
/>
{flavour}
</label>
{/each}
{#if flavours.length === 0}
<p>Please select at least one flavour</p>
{:else if flavours.length > scoops}
<p>Can't order more flavours than scoops!</p>
{:else}
<p>
You ordered {scoops} {scoops === 1 ? 'scoop' : 'scoops'}
of {formatter.format(flavours)}
</p>
{/if}