amis2/docs/zh-CN/components/each.md

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---
title: Each 循环渲染器
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description:
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type: 0
group: ⚙ 组件
menuName: Each 循环渲染器
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icon:
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order: 45
---
## 基本用法
```schema: scope="page"
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{
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"type": "page",
"data": {
"arr": ["A", "B", "C"]
},
"body": {
"type": "each",
"name": "arr",
"items": {
"type": "tpl",
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"tpl": "<span class='label label-default m-l-sm'><%= data.item %></span> "
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}
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}
}
```
### 如果是对象数组
如果数组中的数据是对象,可以直接使用 data.xxx 来获取,另外能用 data.index 来获取数组索引,但如果对象本身也有名字为 index 的字段就会覆盖到,获取不到索引了。
```schema:height="160" scope="page"
{
"type": "page",
"data": {
"arr": [{"name": "a"}, {"name": "b"}, {"name": "c"}]
},
"body": {
"type": "each",
"name": "arr",
"items": {
"type": "tpl",
"tpl": "<span class='label label-default m-l-sm'><%= data.name %>:<%= data.index %></span> "
}
}
}
```
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## 用作 Field 时
当用在 Table 的列配置 Column、List 的内容、Card 卡片的内容和表单的 Static-XXX 中时,可以设置`name`属性,映射同名变量,然后用可以通过 `item` 变量获取单项值
### Table 中的列类型
```schema: scope="body"
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{
"type": "table",
"data": {
"items": [
{
"id": "1",
"each": ["A1", "B1", "C1"]
},
{
"id": "2",
"each": ["A2", "B2", "C2"]
},
{
"id": "3",
"each": []
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}
]
},
"columns": [
{
"name": "id",
"label": "Id"
},
{
"name": "each",
"label": "循环",
"type": "each",
"placeholder": "暂无内容",
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"items": {
"type": "tpl",
"tpl": "<span class='label label-info m-l-sm'><%= this.item %></span>"
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}
}
]
}
```
List 的内容、Card 卡片的内容配置同上
### Form 中静态展示
```schema: scope="body"
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{
"type": "form",
"data": {
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"each": ["A", "B", "C"]
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},
"body": [
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{
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"type": "each",
"label": "静态展示each",
"name": "each",
"items": {
"type": "tpl",
"tpl": "<span class='label label-info m-l-sm'><%= this.item %></span>"
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}
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}
]
}
```
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## 使用数据映射
```schema: scope="page"
{
"type": "page",
"data": {
"arr": ["A", "B", "C"]
},
"body": {
"type": "each",
"source": "${arr}",
"items": {
"type": "tpl",
"tpl": "<span class='label label-default m-l-sm'><%= data.item %></span> "
}
}
}
```
`name` 的优先级会比 `source` 更高
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## 属性表
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| 属性名 | 类型 | 默认值 | 说明 |
| ----------- | -------- | -------- | -------------------------------------------------------------------- |
| type | `string` | `"each"` | 指定为 Each 组件 |
| value | `array` | `[]` | 用于循环的值 |
| name | `string` | | 获取数据域中变量 |
| source | `string` | | 获取数据域中变量, 支持 [数据映射](../../docs/concepts/data-mapping) |
| items | `object` | | 使用`value`中的数据,循环输出渲染器。 |
| placeholder | `string` | | 当 `value` 值不存在或为空数组时的占位文本 |