HIsheR
27 lines
1.7 KiB
TypeScript
27 lines
1.7 KiB
TypeScript
import { effect, h } from '@ui-arch/frame';
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import { addonWrap } from './addons.js';
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import type { TextareaProps } from './types.js';
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/*** 多行输入：value 信号双向绑定，disabled 支持布尔或信号禁用，onInput 为输入回调；prefix/suffix 包纵向附加组，maxCount 显示字数统计 ***/
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export function textarea(props: TextareaProps): HTMLElement {
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const el = h('textarea', { class: 'ua-textarea', rows: props.rows ?? 3, placeholder: props.placeholder ?? '', disabled: props.disabled }) as HTMLTextAreaElement; // false/undefined 移除属性，Signal 走响应式
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if (props.value) {
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const signal = props.value;
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el.addEventListener('input', () => signal(el.value)); // 用户输入写回信号
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effect(() => {
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if (el.value !== signal()) el.value = signal(); // 外部变化写回输入框
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});
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}
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if (props.onInput) el.addEventListener('input', () => props.onInput!(el.value));
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let counter: HTMLElement | null = null; // 字数统计块；maxCount 未传不创建
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if (props.maxCount) {
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el.setAttribute('maxlength', String(props.maxCount)); // 原生拦截超限输入
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counter = h('span', { class: 'ua-textarea-count' });
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const syncCount = (): void => { counter!.textContent = `${el.value.length}/${props.maxCount}`; }; // 实时 n/limit
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el.addEventListener('input', syncCount); // 用户输入时同步
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effect(() => { if (props.value) props.value(); syncCount(); }); // 初始与外部写回时同步（读信号建依赖）
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}
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const suffix = counter ? h('span', { class: 'ua-textarea-count-group' }, counter, props.suffix ?? null) : props.suffix; // 计数并入下方附加组
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return addonWrap(el, props.prefix, suffix, true);
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}
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