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

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---
title: Mapping 映射
description:
type: 0
group: ⚙ 组件
menuName: Mapping 映射
icon:
order: 57
---
## 基本用法
```schema
{
"type": "page",
"body": {
"type": "mapping",
"value": "1",
"map": {
"1": "第一",
"2": "第二",
"3": "第三",
"*": "其他"
}
}
}
```
## 渲染 HTML
```schema
{
"type": "page",
"body": {
"type": "mapping",
"value": "2",
"map": {
"1": "<span class='label label-info'>漂亮</span>",
"2": "<span class='label label-success'>开心</span>",
"3": "<span class='label label-danger'>惊吓</span>",
"4": "<span class='label label-warning'>紧张</span>",
"*": "<span class='label label-default'>其他:${type}</span>"
}
}
}
```
## 渲染其它组件
映射的值也可以是 amis schema渲染其它组件
> 配置了`itemSchema`后,映射值不会再作为`schema`渲染
```schema
{
"type": "page",
"body": {
"type": "mapping",
"value": "1",
"map": {
"1": {
"type": "tag",
"label": "#4096ff",
"displayMode": "rounded",
"color": "#4096ff"
},
"2": {
"type": "tpl",
"tpl": "2"
},
"*": "其他"
}
}
}
```
## 渲染 自定义模板
> since 2.5.2
可配置`itemSchema` 渲染自定义模板,支持`HTML`或`schema`
当映射值是`非object`时,可使用`${item}`获取映射值;
### html 或字符串模板
使用`${item}` 获取映射值
```schema
{
"type": "page",
"body": {
"type": "mapping",
"value": "1",
"map": {
"1": "第一",
"2": "第二",
"3": "第三",
"*": "其他"
},
"itemSchema": "自定义模板:<span style='color: red'>${item}</span>"
}
}
```
### SchemaNode 模板
```schema
{
"type": "page",
"body": {
"type": "mapping",
"value": "1",
"map": {
"1": "第一",
"2": "第二",
"3": "第三",
"*": "其他"
},
"itemSchema": {
"type": "tag",
"label": "${item}"
}
}
}
```
### 在模板中渲染数据
- 当映射值是`object`时,使用模板语法可获取`object`属性值
- 当映射值是`非object`时,使用`${item}` 获取映射值
- 也可以获取数据域中的其他数据
```schema
{
"type": "page",
"data": {
"myName": "cat"
},
"body": {
"type": "mapping",
"value": "1",
"map": {
"1": {
"label": "开心",
"color": "red"
},
"2": {
"label": "伤心",
"color": "blue"
},
"3": {
"label": "冷漠",
"color": "gray"
},
"*": "其他"
},
"itemSchema": {
"type": "tag",
"label": "${myName} ${label}",
"color": "${color}"
}
}
}
```
## 映射展示多个
> 1.5.0 及以上版本
如果返回值是数组会显示为多个
```schema
{
"type": "page",
"body": {
"type": "mapping",
"value": ["1", "2", "3", "4", "5"],
"map": {
"1": "<span class='label label-info'>漂亮</span>",
"2": "<span class='label label-success'>开心</span>",
"3": "<span class='label label-danger'>惊吓</span>",
"4": "<span class='label label-warning'>紧张</span>",
"*": "<span class='label label-default'>其他</span>"
}
}
}
```
## map 映射源
### k-v 对象
```json
{
"type": "mapping",
"value": "1",
"map": {
"1": "第一",
"2": "第二",
"3": "第三",
"*": "其他"
}
}
```
### 对象数组
> since 2.5.2
#### 简单对象数组
```json
{
"type": "mapping",
"value": "1",
"map": [{"1": "第一"}, {"2": "第二"}, {"3": "第三"}, {"*": "其他"}]
}
```
#### 多 key 对象数组
当映射值有多个 key 时,需要使用`valueField`指定字段作为`mapping`的`key`, 也就是用来匹配`value`的值
可使用`labelField`指定展示字段,不配置时,默认为`label`
**注意:**配置`labelField`后,映射值无法再作为`schema`渲染
```json
{
"type": "mapping",
"value": "happy",
"valueField": "name",
"map": [
{
"name": "happy",
"label": "开心"
},
{
"name": "sad",
"label": "悲伤"
},
{
"name": "*",
"label": "其他"
}
]
}
```
```schema
{
"type": "page",
"body": {
"type": "mapping",
"value": "happy",
"valueField": "name",
"labelField": "label",
"map": [
{
"name": "happy",
"label": "开心",
"color": "red"
},
{
"name": "sad",
"label": "悲伤",
"color": "blue"
},
{
"name": "*",
"label": "其他",
"color": "gray"
}
]
}
}
```
## 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
### Table 中的列类型
```schema: scope="body"
{
"type": "table",
"data": {
"items": [
{
"id": "1",
"type": "1"
},
{
"id": "2",
"type": "2"
},
{
"id": "3",
"type": "3"
}
]
},
"columns": [
{
"name": "id",
"label": "Id"
},
{
"name": "type",
"label": "映射",
"type": "mapping",
"map": {
"1": "<span class='label label-info'>漂亮</span>",
"2": "<span class='label label-success'>开心</span>",
"3": "<span class='label label-danger'>惊吓</span>",
"4": "<span class='label label-warning'>紧张</span>",
"*": "其他:${type}"
}
}
]
}
```
List 的内容、Card 卡片的内容配置同上
### Form 中静态展示
```schema: scope="body"
{
"type": "form",
"data": {
"type": "2"
},
"body": [
{
"type": "static-mapping",
"name": "type",
"label": "映射",
"map": {
"1": "<span class='label label-info'>漂亮</span>",
"2": "<span class='label label-success'>开心</span>",
"3": "<span class='label label-danger'>惊吓</span>",
"4": "<span class='label label-warning'>紧张</span>",
"*": "其他:${type}"
}
}
]
}
```
### 布尔值映射
```schema: scope="body"
{
"type": "form",
"data": {
"type": true
},
"body": [
{
"type": "static-mapping",
"name": "type",
"label": "映射",
"map": {
"1": "<span class='label label-info'></span>",
"0": "<span class='label label-default'></span>"
}
}
]
}
```
或者
```schema: scope="body"
{
"type": "form",
"data": {
"type": true
},
"body": [
{
"type": "static-mapping",
"name": "type",
"label": "映射",
"map": {
"true": "<span class='label label-info'>开</span>",
"false": "<span class='label label-default'>关</span>"
}
}
]
}
```
### 远程拉取字典
> since 1.1.6
通过配置 `source` 接口来实现,接口返回字典对象即可,数据格式参考 map 配置。
```schema: scope="body"
{
"type": "form",
"data": {
"type": "2"
},
"body": [
{
"type": "mapping",
"name": "type",
"label": "映射",
"source": "/api/mapping"
}
]
}
```
> 默认 source 是有 30s 缓存的,通常字典数据不长变更。如果想修改,请参考 [API](../../../docs/types/api) 文档配置缓存。
### 关联上下文变量
> since 1.1.6
同样通过配置 `source` 来实现,只是格式是取变量。
> 注意:当数据域里的变量值为`$$`时, 表示将所有接口返回的`data`字段值整体赋值到对应的 key 中
```schema: scope="body"
{
"type": "form",
"initApi": {
"url": "/api/mapping",
"method": "get",
"responseData": {
"zidian": "$$$$",
"type": "2"
}
},
"body": [
{
"type": "mapping",
"name": "type",
"label": "映射",
"source": "$${zidian}"
}
]
}
```
## 占位文本
通过 `placeholder` 可以控制数据不存在时的展现
```schema
{
"type": "page",
"body": {
"type": "mapping",
"placeholder": "数据不存在",
"map": {
"1": "第一",
"2": "第二",
"3": "第三",
"*": "其他"
}
}
}
```
## 属性表
| 属性名 | 类型 | 默认值 | 说明 |
| ----------- | --------------------------------------------------- | ------ | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| className | `string` | | 外层 CSS 类名 |
| placeholder | `string` | | 占位文本 |
| map | `object`或`Array<object>` | | 映射配置 |
| source | `string` or `API` | | [API](../../../docs/types/api) 或 [数据映射](../../../docs/concepts/data-mapping) |
| valueField | `string` | value | `2.5.2` map 或 source 为`Array<object>`时,用来匹配映射的字段名 |
| labelField | `string` | label | `2.5.2` map 或 source 为`Array<object>`时,用来展示的字段名<br />注:配置后映射值无法作为`schema`组件渲染 |
| itemSchema | `string`或[SchemaNode](../../docs/types/schemanode) | | `2.5.2` 自定义渲染模板,支持`html`或`schemaNode`<br /> 当映射值是`非object`时,可使用`${item}`获取映射值;<br />当映射值是`object`时,可使用映射语法: `${xxx}`获取`object`的值;<br /> 也可使用数据映射语法:`${xxx}`获取数据域中变量值。 |