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---
title: Textarea 多行文本框
description: 用于多行文本信息输入。
spline: form
isComponent: true
---
<span class="coverages-badge" style="margin-right: 10px"><img src="https://img.shields.io/badge/coverages%3A%20lines-100%25-blue" /></span><span class="coverages-badge" style="margin-right: 10px"><img src="https://img.shields.io/badge/coverages%3A%20functions-100%25-blue" /></span><span class="coverages-badge" style="margin-right: 10px"><img src="https://img.shields.io/badge/coverages%3A%20statements-100%25-blue" /></span><span class="coverages-badge" style="margin-right: 10px"><img src="https://img.shields.io/badge/coverages%3A%20branches-92%25-blue" /></span>
## 引入
全局引入，在 miniprogram 根目录下的`app.json`中配置，局部引入，在需要引入的页面或组件的`index.json`中配置。
```json
"usingComponents": {
"t-textarea": "tdesign-miniprogram/textarea/textarea"
}
```
## 代码演示
### 基础多行文本框
<img src="https://tdesign.gtimg.com/miniprogram/readme/input-2.png" width="375px" height="50%">
{{ base }}
### 带标题多行文本框
{{ label }}
### 自动增高多行文本框
{{ autoSize }}
### 禁用多行文本框
{{ disabled }}
### 设置最大字符个数
{{ maxlength }}
### 设置最大字符个数，一个汉字表示两个字符
{{ maxcharacter }}
## 提示
- 如果需要在页面中调整 `textarea` 中 `placeholder` 样式，请使用名称为`t-textarea__placeholder`的Class选择器，直接覆盖组件内部样式（注意权重）。
## API
### Textarea Props
名称 | 类型 | 默认值 | 说明 | 必传
-- | -- | -- | -- | --
adjust-position | Boolean | true | 键盘弹起时，是否自动上推页面 | N
autofocus | Boolean | false | 自动聚焦，拉起键盘 | N
autosize | Boolean | false | 是否自动增高，值为 autosize 时，style.height 不生效 | N
confirm-hold | Boolean | false | 点击键盘右下角按钮时是否保持键盘不收起点 | N
confirm-type | String | done | 设置键盘右下角按钮的文字，仅在 type='text'时生效。可选项：send/search/next/go/done/return。TS 类型：`'send' | 'search' | 'next' | 'go' | 'done' | 'return'` | N
disabled | Boolean | false | 是否禁用文本框 | N
external-classes | Array | - | 组件类名，分别用于表示组件外层元素、输入框、占位符、标签名等元素类名。`['t-class', 't-class-textarea', 't-class-label']` | N
focus | Boolean | false | 自动聚焦 | N
label | String / Slot | - | 左侧文本 | N
maxcharacter | Number | - | 用户最多可以输入的字符个数，一个中文汉字表示两个字符长度 | N
maxlength | Number | - | 用户最多可以输入的字符个数 | N
placeholder | String | undefined | 占位符 | N
value | String | - | 文本框值 | N
cursor-spacing | Number | - | 0 | 指定光标与键盘的距离。取textarea距离底部的距离和cursor-spacing指定的距离的最小值作为光标与键盘的距离 | N |
### Textarea Events
名称 | 参数 | 描述
-- | -- | --
blur | `(value: TextareaValue)` | 失去焦点时触发
change | `(value: TextareaValue)` | 输入内容变化时触发
enter | `(value: TextareaValue)` | 点击完成时触发
focus | `(value: TextareaValue)` | 获得焦点时触发
line-change | `(value: TextareaValue)` | 行高发生变化时触发

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import { TdTextareaProps } from './type';
declare const props: TdTextareaProps;
export default props;

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const props = {
adjustPosition: {
type: Boolean,
value: true,
},
autofocus: {
type: Boolean,
value: false,
},
autosize: {
type: Boolean,
value: false,
},
confirmHold: {
type: Boolean,
value: false,
},
confirmType: {
type: String,
value: 'done',
},
disabled: {
type: Boolean,
value: false,
},
externalClasses: {
type: Array,
},
focus: {
type: Boolean,
value: false,
},
label: {
type: String,
},
maxcharacter: {
type: Number,
},
maxlength: {
type: Number,
},
placeholder: {
type: String,
value: undefined,
},
value: {
type: String,
value: null,
},
};
export default props;

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import { SuperComponent } from '../common/src/index';
export default class Textarea extends SuperComponent {
options: {
multipleSlots: boolean;
};
behaviors: string[];
externalClasses: string[];
properties: {
cursorSpacing: {
type: NumberConstructor;
value: number;
};
adjustPosition?: {
type: BooleanConstructor;
value?: boolean;
required?: boolean;
};
autofocus?: {
type: BooleanConstructor;
value?: boolean;
required?: boolean;
};
autosize?: {
type: BooleanConstructor;
value?: boolean;
required?: boolean;
};
confirmHold?: {
type: BooleanConstructor;
value?: boolean;
required?: boolean;
};
confirmType?: {
type: StringConstructor;
value?: "send" | "search" | "next" | "go" | "done";
required?: boolean;
};
disabled?: {
type: BooleanConstructor;
value?: boolean;
required?: boolean;
};
externalClasses?: {
type: ArrayConstructor;
value?: ["t-class", "t-class-textarea", "t-class-placeholder", "t-class-name"];
required?: boolean;
};
focus?: {
type: BooleanConstructor;
value?: boolean;
required?: boolean;
};
label?: {
type: StringConstructor;
value?: string;
required?: boolean;
};
maxcharacter?: {
type: NumberConstructor;
value?: number;
required?: boolean;
};
maxlength?: {
type: NumberConstructor;
value?: number;
required?: boolean;
};
placeholder?: {
type: StringConstructor;
value?: string;
required?: boolean;
};
value?: {
type: StringConstructor;
value?: string;
required?: boolean;
};
};
data: {
prefix: string;
classPrefix: string;
count: number;
};
lifetimes: {
ready(): void;
};
methods: {
updateValue(value: any): void;
onInput(event: any): void;
onFocus(event: any): void;
onBlur(event: any): void;
onConfirm(event: any): void;
onLineChange(event: any): void;
};
}

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var __decorate = (this && this.__decorate) || function (decorators, target, key, desc) {
var c = arguments.length, r = c < 3 ? target : desc === null ? desc = Object.getOwnPropertyDescriptor(target, key) : desc, d;
if (typeof Reflect === "object" && typeof Reflect.decorate === "function") r = Reflect.decorate(decorators, target, key, desc);
else for (var i = decorators.length - 1; i >= 0; i--) if (d = decorators[i]) r = (c < 3 ? d(r) : c > 3 ? d(target, key, r) : d(target, key)) || r;
return c > 3 && r && Object.defineProperty(target, key, r), r;
};
import { SuperComponent, wxComponent } from '../common/src/index';
import config from '../common/config';
import props from './props';
import { getCharacterLength } from '../common/utils';
const { prefix } = config;
const name = `${prefix}-textarea`;
let Textarea = class Textarea extends SuperComponent {
constructor() {
super(...arguments);
this.options = {
multipleSlots: true,
};
this.behaviors = ['wx://form-field'];
this.externalClasses = [`${prefix}-class`, `${prefix}-class-textarea`, `${prefix}-class-label`];
this.properties = Object.assign(Object.assign({}, props), { cursorSpacing: {
type: Number,
value: 0,
} });
this.data = {
prefix,
classPrefix: name,
count: 0,
};
this.lifetimes = {
ready() {
const { value } = this.properties;
this.updateValue(value);
},
};
this.methods = {
updateValue(value) {
const { maxcharacter, maxlength } = this.properties;
if (maxcharacter > 0 && !Number.isNaN(maxcharacter)) {
const { length, characters } = getCharacterLength('maxcharacter', value, maxcharacter);
this.setData({
value: characters,
count: length,
});
}
else if (maxlength > 0 && !Number.isNaN(maxlength)) {
const { length, characters } = getCharacterLength('maxlength', value, maxlength);
this.setData({
value: characters,
count: length,
});
}
else {
this.setData({
value,
count: value ? String(value).length : 0,
});
}
},
onInput(event) {
const { value } = event.detail;
this.updateValue(value);
this.triggerEvent('change', { value: this.data.value });
},
onFocus(event) {
this.triggerEvent('focus', Object.assign({}, event.detail));
},
onBlur(event) {
this.triggerEvent('blur', Object.assign({}, event.detail));
},
onConfirm(event) {
this.triggerEvent('enter', Object.assign({}, event.detail));
},
onLineChange(event) {
this.triggerEvent('lineChange', Object.assign({}, event.detail));
},
};
}
};
Textarea = __decorate([
wxComponent()
], Textarea);
export default Textarea;

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{
"component": true,
"usingComponents": {}
}

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<view class="{{classPrefix}} {{prefix}}-class">
<view class="{{classPrefix}}__name {{prefix}}-class-label">
<view wx:if="{{ label && label.length > 0 }}">{{ label }}</view>
<slot wx:else name="label" />
</view>
<view class="{{classPrefix}}__wrapper">
<textarea
disabled="{{disabled}}"
placeholder="{{placeholder}}"
class="{{classPrefix}}__wrapper-textarea {{prefix}}-class-textarea"
placeholder-class="{{classPrefix}}__placeholder"
value="{{value}}"
auto-focus="{{autofocus}}"
focus="{{focus}}"
cursor-spacing="{{cursorSpacing}}"
auto-height="{{autosize}}"
adjust-position="{{adjustPosition}}"
confirm-type="{{confirmType}}"
confirm-hold="{{confirmHold}}"
bindinput="onInput"
bindfocus="onFocus"
bindblur="onBlur"
bindconfirm="onConfirm"
bindlinechange="onLineChange"
/>
<view wx:if="{{maxcharacter || maxlength}}" class="{{classPrefix}}__count">
{{count }} / {{maxcharacter || maxlength}}
</view>
</view>
</view>

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.t-float-left {
float: left;
}
.t-float-right {
float: right;
}
@keyframes tdesign-fade-out {
from {
opacity: 1;
}
to {
opacity: 0;
}
}
.hotspot-expanded.relative {
position: relative;
}
.hotspot-expanded::after {
content: '';
display: block;
position: absolute;
left: 0;
top: 0;
right: 0;
bottom: 0;
transform: scale(1.5);
}
.t-textarea {
position: relative;
background-color: #fff;
}
.t-textarea__name:not(:empty) {
position: relative;
padding: 24rpx 32rpx;
font-size: 32rpx;
color: #000000;
overflow: hidden;
white-space: nowrap;
text-overflow: ellipsis;
}
.t-textarea__name:not(:empty)::after {
position: absolute;
box-sizing: border-box;
content: ' ';
pointer-events: none;
right: 0;
left: 0;
bottom: 0;
border-bottom: 1px solid #e6e6e6;
transform: scaleY(0.5);
left: 32rpx;
}
.t-textarea__wrapper {
padding: 24rpx 32rpx;
font-size: 32rpx;
color: #000000;
}
.t-textarea__wrapper-textarea {
display: block;
box-sizing: border-box;
width: 100%;
min-width: 0;
margin: 0;
padding: 0;
text-align: left;
background-color: transparent;
border: 0;
resize: none;
font-size: 32rpx;
line-height: 48rpx;
}
.t-textarea__placeholder,
.t-textarea__count {
color: #888888;
font-size: 32rpx;
line-height: 48rpx;
}
.t-textarea__count {
font-size: 24rpx;
text-align: right;
}

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export interface TdTextareaProps {
adjustPosition?: {
type: BooleanConstructor;
value?: boolean;
required?: boolean;
};
autofocus?: {
type: BooleanConstructor;
value?: boolean;
required?: boolean;
};
autosize?: {
type: BooleanConstructor;
value?: boolean;
required?: boolean;
};
confirmHold?: {
type: BooleanConstructor;
value?: boolean;
required?: boolean;
};
confirmType?: {
type: StringConstructor;
value?: 'send' | 'search' | 'next' | 'go' | 'done';
required?: boolean;
};
disabled?: {
type: BooleanConstructor;
value?: boolean;
required?: boolean;
};
externalClasses?: {
type: ArrayConstructor;
value?: ['t-class', 't-class-textarea', 't-class-placeholder', 't-class-name'];
required?: boolean;
};
focus?: {
type: BooleanConstructor;
value?: boolean;
required?: boolean;
};
label?: {
type: StringConstructor;
value?: string;
required?: boolean;
};
maxcharacter?: {
type: NumberConstructor;
value?: number;
required?: boolean;
};
maxlength?: {
type: NumberConstructor;
value?: number;
required?: boolean;
};
placeholder?: {
type: StringConstructor;
value?: string;
required?: boolean;
};
value?: {
type: StringConstructor;
value?: string;
required?: boolean;
};
}

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export {};