amis/docs/zh-CN/components/form/radios.md

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---
title: Radios 单选框
description:
type: 0
group: null
menuName: Radios 单选框
icon:
order: 36
---
用于实现单选。
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## 基本用法
```schema: scope="body"
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{
"type": "form",
"body": [
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{
"name": "radios",
"type": "radios",
"label": "radios",
"options": [
{
"label": "OptionA",
"value": "a"
},
{
"label": "OptionB",
"value": "b"
},
{
"label": "OptionC",
"value": "c"
},
{
"label": "OptionD",
"value": "d"
}
]
}
]
}
```
## 列显示
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设置 `inline` 可以纵向显示,用于显示列很多的情况
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```schema: scope="body"
{
"type": "form",
"body": [
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{
"name": "radios",
"type": "radios",
"label": "radios",
"inline": false,
"options": [
{
"label": "OptionA",
"value": "a"
},
{
"label": "OptionB",
"value": "b"
},
{
"label": "OptionC",
"value": "c"
},
{
"label": "OptionD",
"value": "d"
}
]
}
]
}
```
## 控制列显示的分裂
通过 columnsCount 来设置列显示的列数,比如下面例子是两列。
```schema: scope="body"
{
"type": "form",
"body": [
{
"name": "radios",
"type": "radios",
"label": "radios",
"inline": false,
"columnsCount": 2,
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"options": [
{
"label": "OptionA",
"value": "a"
},
{
"label": "OptionB",
"value": "b"
},
{
"label": "OptionC",
"value": "c"
},
{
"label": "OptionD",
"value": "d"
}
]
}
]
}
```
## 默认选择第一个
通过 `selectFirst` 属性配置
```schema: scope="body"
{
"type": "form",
"body": [
{
"name": "radios",
"type": "radios",
"label": "radios",
"selectFirst": true,
"options": [
{
"label": "OptionA",
"value": "a"
},
{
"label": "OptionB",
"value": "b"
},
{
"label": "OptionC",
"value": "c"
},
{
"label": "OptionD",
"value": "d"
}
]
}
]
}
```
## 动态选项
可以配置 `source` 来从上下文或远程 api 拉取选项数据
```schema: scope="body"
{
"type": "page",
"body": {
"type": "form",
"data": {
"items": [
{
"label": "A",
"value": "a"
},
{
"label": "B",
"value": "b"
},
{
"label": "C",
"value": "c"
}
]
},
"body": [
{
"label": "选项",
"type": "radios",
"name": "radios",
"source": "${items}"
}
]
}
}
```
远程 api
```schema: scope="body"
{
"type": "page",
"body": {
"type": "form",
"body": [
{
"label": "选项",
"type": "radios",
"name": "radios",
"source": "/api/mock2/form/getOptions?waitSeconds=1"
}
]
}
}
```
api 返回内容需要包含 options 字段
```json
{
"status": 0,
"msg": "",
"data": {
"value": "b", // 可选,如果返回就会自动选中 b 选项
// 必须用 options 作为选项组的 key 值
"options": [
{
"label": "A",
"value": "a"
},
{
"label": "B",
"value": "b"
},
{
"label": "C",
"value": "c"
}
]
}
}
```
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## 属性表
当做选择器表单项使用时,除了支持 [普通表单项属性表](./formitem#%E5%B1%9E%E6%80%A7%E8%A1%A8) 中的配置以外,还支持下面一些配置
| 属性名 | 类型 | 默认值 | 说明 |
| ------------ | ----------------------------------------- | --------- | ------------------------------------------------------------------------------------------- |
| options | `Array<object>`或`Array<string>` | | [选项组](./options#%E9%9D%99%E6%80%81%E9%80%89%E9%A1%B9%E7%BB%84-options) |
| source | `string`或 [API](../../../docs/types/api) | | [动态选项组](./options#%E5%8A%A8%E6%80%81%E9%80%89%E9%A1%B9%E7%BB%84-source) |
| labelField | `boolean` | `"label"` | [选项标签字段](./options#%E9%80%89%E9%A1%B9%E6%A0%87%E7%AD%BE%E5%AD%97%E6%AE%B5-labelfield) |
| valueField | `boolean` | `"value"` | [选项值字段](./options#%E9%80%89%E9%A1%B9%E5%80%BC%E5%AD%97%E6%AE%B5-valuefield) |
| columnsCount | `number` | `1` | 选项按几列显示,默认为一列 |
| inline | `boolean` | `true` | 是否显示为一行 |
| selectFirst | `boolean` | `false` | 是否默认选中第一个 |
| autoFill | `object` | | [自动填充](./options#%E8%87%AA%E5%8A%A8%E5%A1%AB%E5%85%85-autofill) |
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## 事件表
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当前组件会对外派发以下事件,可以通过`onEvent`来监听这些事件,并通过`actions`来配置执行的动作,在`actions`中可以通过`event.data.xxx`事件参数变量来获取事件产生的数据,详细请查看[事件动作](../../docs/concepts/event-action)。
| 事件名称 | 事件参数 | 说明 |
| -------- | --------------------------------- | ---------------- |
| change | `event.data.value: string` 选中值 | 选中值变化时触发 |
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## 动作表
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当前组件对外暴露以下特性动作,其他组件可以通过指定`actionType: 动作名称`、`componentId: 该组件id`来触发这些动作,动作配置可以通过`args: {动作配置项名称: xxx}`来配置具体的参数,详细请查看[事件动作](../../docs/concepts/event-action#触发其他组件的动作)。
| 动作名称 | 动作配置 | 说明 |
| -------- | ------------------------ | ------------------------------------------------------- |
| clear | - | 清空 |
| reset | - | 将值重置为`resetValue`,若没有配置`resetValue`,则清空 |
| reload | - | 重新加载,调用 `source`,刷新数据域数据刷新(重新加载) |
| setValue | `value: string` 更新的值 | 更新数据 |