<select>
元素可以具有 multiple
属性,在这种情况下它将填充数组而不是选择单个值。
¥A <select>
element can have a multiple
attribute, in which case it will populate an array rather than selecting a single value.
用 <select multiple>
替换复选框:
¥Replace the checkboxes with a <select multiple>
:
App
<h2>Flavours</h2>
<select multiple bind:value={flavours}>
{#each ['cookies and cream', 'mint choc chip', 'raspberry ripple'] as flavour}
<option>{flavour}</option>
{/each}
</select>
请注意,我们可以省略 <option>
上的 value
属性,因为该值与元素的内容相同。
¥Note that we’re able to omit the value
attribute on the <option>
, since the value is identical to the element’s contents.
按住
control
键(或 MacOS 上的command
键)可选择多个选项。¥[!NOTE] Press and hold the
control
key (or thecommand
key on MacOS) to select multiple options.
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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}
bind:group={scoops}
/>
{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}
bind:group={flavours}
/>
{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}