feat: 添加可定制的下拉选择组件

This commit is contained in:
seahi committed 2026-08-06 12:31:00 +08:00
1 parent caef609fc8
commit bbbc5c07a2
1 file changed
+267
@@ -0,0 +1,267 @@
<script lang="ts">
type SelectValue = string | number;
type SelectOption = {
value: SelectValue;
label: string;
};
type Props = {
name: string;
label: string;
options: SelectOption[];
value?: SelectValue;
emptyLabel?: string;
};
let {
name,
label,
options,
value = $bindable<SelectValue>(''),
emptyLabel = '-- 无 --'
}: Props = $props();
let isOpen = $state(false);
let triggerElement = $state<HTMLButtonElement>();
let menuElement = $state<HTMLDivElement>();
let selectedOption = $derived(options.find((option) => String(option.value) === String(value)));
let selectedLabel = $derived(selectedOption?.label ?? emptyLabel);
function menuOptions() {
return Array.from(menuElement?.querySelectorAll<HTMLButtonElement>('[role="option"]') ?? []);
}
function focusOption(preferLast = false) {
requestAnimationFrame(() => {
const items = menuOptions();
const selectedIndex = items.findIndex(
(item) => item.getAttribute('aria-selected') === 'true'
);
items[selectedIndex >= 0 ? selectedIndex : preferLast ? items.length - 1 : 0]?.focus();
});
}
function openMenu(preferLast = false) {
isOpen = true;
focusOption(preferLast);
}
function closeMenu(restoreFocus = false) {
isOpen = false;
if (restoreFocus) triggerElement?.focus();
}
function selectOption(nextValue: SelectValue) {
value = nextValue;
closeMenu(true);
}
function handleTriggerKeydown(event: KeyboardEvent) {
if (event.key === 'ArrowDown' || event.key === 'ArrowUp') {
event.preventDefault();
openMenu(event.key === 'ArrowUp');
}
}
function handleMenuKeydown(event: KeyboardEvent) {
const items = menuOptions();
const currentIndex = items.indexOf(document.activeElement as HTMLButtonElement);
if (event.key === 'Escape') {
event.preventDefault();
closeMenu(true);
return;
}
if (event.key === 'Tab') {
closeMenu();
return;
}
let nextIndex: number | undefined;
if (event.key === 'ArrowDown') nextIndex = (currentIndex + 1) % items.length;
if (event.key === 'ArrowUp') nextIndex = (currentIndex - 1 + items.length) % items.length;
if (event.key === 'Home') nextIndex = 0;
if (event.key === 'End') nextIndex = items.length - 1;
if (nextIndex !== undefined) {
event.preventDefault();
items[nextIndex]?.focus();
}
}
</script>
<div class="select-dropdown">
<input type="hidden" {name} {value} />
<button
type="button"
class="select-dropdown-trigger"
class:open={isOpen}
bind:this={triggerElement}
aria-label={label}
aria-haspopup="listbox"
aria-expanded={isOpen}
aria-controls={`${name}-menu`}
onclick={() => (isOpen ? closeMenu() : openMenu())}
onkeydown={handleTriggerKeydown}
>
<span>{selectedLabel}</span>
<svg viewBox="0 0 24 24" aria-hidden="true">
<polyline points="6 9 12 15 18 9"></polyline>
</svg>
</button>
{#if isOpen}
<button
type="button"
class="select-dropdown-overlay"
aria-label={`关闭${label}菜单`}
tabindex="-1"
onclick={() => closeMenu()}
></button>
<div
class="select-dropdown-menu"
id={`${name}-menu`}
role="listbox"
aria-label={label}
tabindex="-1"
bind:this={menuElement}
onkeydown={handleMenuKeydown}
>
<button
type="button"
class="select-dropdown-item"
class:selected={value === ''}
role="option"
aria-selected={value === ''}
onclick={() => selectOption('')}
>
{emptyLabel}
</button>
{#each options as option (option.value)}
<button
type="button"
class="select-dropdown-item"
class:selected={String(option.value) === String(value)}
role="option"
aria-selected={String(option.value) === String(value)}
onclick={() => selectOption(option.value)}
>
{option.label}
</button>
{/each}
</div>
{/if}
</div>
<style>
.select-dropdown {
position: relative;
width: 100%;
}
.select-dropdown-trigger {
position: relative;
z-index: 50;
display: flex;
align-items: center;
justify-content: space-between;
width: 100%;
padding: 10px 0;
border: none;
border-bottom: 2px solid rgba(0, 0, 0, 0.1);
background: transparent;
color: var(--text-color);
font-family: inherit;
font-size: 1rem;
text-align: left;
cursor: pointer;
transition:
border-color 0.2s ease,
color 0.2s ease;
}
.select-dropdown-trigger:hover,
.select-dropdown-trigger:focus-visible,
.select-dropdown-trigger.open {
outline: none;
border-bottom-color: var(--accent-color, #419b38);
}
.select-dropdown-trigger svg {
width: 17px;
height: 17px;
margin-left: 12px;
fill: none;
stroke: currentColor;
stroke-width: 1.8;
stroke-linecap: round;
stroke-linejoin: round;
transition: transform 0.2s ease;
}
.select-dropdown-trigger.open svg {
transform: rotate(180deg);
}
.select-dropdown-overlay {
position: fixed;
inset: 0;
z-index: 49;
margin: 0;
padding: 0;
border: none;
background: transparent;
cursor: default;
}
.select-dropdown-menu {
position: absolute;
top: 100%;
left: 0;
right: 0;
z-index: 51;
display: flex;
flex-direction: column;
max-height: 240px;
margin-top: 4px;
overflow-y: auto;
border: 1px solid var(--text-color);
background: var(--bg-color, #ffffff);
box-shadow: 2px 2px 0 rgba(0, 0, 0, 0.15);
}
.select-dropdown-item {
flex: 0 0 auto;
padding: 8px 12px;
border: none;
border-bottom: 1px solid rgba(0, 0, 0, 0.1);
background: transparent;
color: var(--text-color);
font-family: inherit;
font-size: 0.85rem;
font-weight: 600;
text-align: left;
cursor: pointer;
transition:
background-color 0.2s ease,
color 0.2s ease;
}
.select-dropdown-item:last-child {
border-bottom: none;
}
.select-dropdown-item:hover,
.select-dropdown-item:focus-visible {
outline: none;
background: var(--text-color);
color: var(--bg-color, #ffffff);
}
.select-dropdown-item.selected:not(:hover):not(:focus-visible) {
color: var(--accent-color, #419b38);
}
</style>