amis2/docs/zh-CN/components/form/combo.md

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---
title: Combo 组合
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description:
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type: 0
group: null
menuName: Combo
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icon:
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order: 12
---
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用于将多个表单项组合到一起,实现深层结构的数据编辑。
比如想提交 `user.name` 这样的数据结构,有两种方法:一种是将表单项的 name 设置为`user.name`,另一种就是使用 combo。
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## 基本使用
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配置`items`属性,组合多个表单项
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```schema: scope="body"
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{
"type": "form",
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"debug": true,
"api": "/api/mock2/form/saveForm",
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"body": [
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{
"type": "combo",
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"name": "user",
"label": "用户",
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"items": [
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{
"name": "text",
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"label": "名字",
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"type": "input-text"
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},
{
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"name": "gender",
"label": "性别",
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"type": "select",
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"options": ["男", "女"]
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}
]
}
]
}
```
## 多行展示模式
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默认combo 内表单项是横着展示一排,如果想换行展示,可以配置`"multiLine": true`
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```schema: scope="body"
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{
"type": "form",
"mode": "horizontal",
"api": "/api/mock2/form/saveForm",
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"body": [
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{
"type": "combo",
"name": "combo1",
"label": "Combo 单行展示",
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"items": [
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{
"name": "text",
"label": "文本",
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"type": "input-text"
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},
{
"name": "select",
"label": "选项",
"type": "select",
"options": ["a", "b", "c"]
}
]
},
{
"type": "divider"
},
{
"type": "combo",
"name": "combo2",
"label": "Combo 多行展示",
"multiLine": true,
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"items": [
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{
"name": "text",
"label": "文本",
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"type": "input-text"
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},
{
"name": "select",
"label": "选项",
"type": "select",
"options": ["a", "b", "c"]
}
]
}
]
}
```
## 多选模式
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默认combo 为单选模式,可以配置`"multiple": true`实现多选模式。
这时提交的将会是对象数组。
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```schema: scope="body"
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{
"type": "form",
"mode": "horizontal",
"api": "/api/mock2/form/saveForm",
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"debug": true,
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"body": [
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{
"type": "combo",
"name": "combo1",
"label": "Combo 单选展示",
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"items": [
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{
"name": "text",
"label": "文本",
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"type": "input-text"
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},
{
"name": "select",
"label": "选项",
"type": "select",
"options": ["a", "b", "c"]
}
]
},
{
"type": "divider"
},
{
"type": "combo",
"name": "combo2",
"label": "Combo 多选展示",
"multiple": true,
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"items": [
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{
"name": "text",
"label": "文本",
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"type": "input-text"
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},
{
"name": "select",
"label": "选项",
"type": "select",
"options": ["a", "b", "c"]
}
]
}
]
}
```
## 限制个数
多选模式下,可以配置`minLength`和`maxLength`配置该 Combo 可添加的条数
```schema: scope="body"
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{
"type": "form",
"mode": "horizontal",
"api": "/api/mock2/form/saveForm",
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"body": [
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{
"type": "combo",
"name": "combo1",
"label": "最少添加1条",
"multiple": true,
"minLength": 1,
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"items": [
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{
"name": "text",
"label": "文本",
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"type": "input-text"
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},
{
"name": "select",
"label": "选项",
"type": "select",
"options": ["a", "b", "c"]
}
]
},
{
"type": "combo",
"name": "combo2",
"label": "最多添加3条",
"multiple": true,
"maxLength": 3,
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"items": [
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{
"name": "text",
"label": "文本",
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"type": "input-text"
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},
{
"name": "select",
"label": "选项",
"type": "select",
"options": ["a", "b", "c"]
}
]
}
]
}
```
## 值格式
观察下例中表单数据域值的变化,可以发现:
- 单选模式时,**数据格式为对象**
- 多选模式时,**数据格式为数组,数组成员是对象**
```schema: scope="body"
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{
"type": "form",
"debug": true,
"mode": "horizontal",
"api": "/api/mock2/form/saveForm",
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"body": [
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{
"type": "combo",
"name": "combo1",
"label": "Combo 单选展示",
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"items": [
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{
"name": "text",
"label": "文本",
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"type": "input-text"
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},
{
"name": "select",
"label": "选项",
"type": "select",
"options": ["a", "b", "c"]
}
]
},
{
"type": "divider"
},
{
"type": "combo",
"name": "combo2",
"label": "Combo 多选展示",
"multiple": true,
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"items": [
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{
"name": "text",
"label": "文本",
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"type": "input-text"
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},
{
"name": "select",
"label": "选项",
"type": "select",
"options": ["a", "b", "c"]
}
]
}
]
}
```
### 打平值
默认多选模式下,数据格式是对象数组的形式,当你配置的组合中只有一个表单项时,可以配置`"flat": true`,将值进行打平处理。
```schema: scope="body"
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{
"type": "form",
"debug": true,
"mode": "horizontal",
"api": "/api/mock2/form/saveForm",
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"body": [
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{
"type": "combo",
"name": "combo1",
"label": "默认模式",
"multiple": true,
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"items": [
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{
"name": "text",
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"type": "input-text"
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}
]
},
{
"type": "divider"
},
{
"type": "combo",
"name": "combo2",
"label": "打平模式",
"multiple": true,
"flat": true,
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"items": [
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{
"name": "text",
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"type": "input-text"
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}
]
}
]
}
```
查看上例表单数据域,可以看到打平后数据格式如下:
```json
{
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"combo2": ["aaa", "bbb"]
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}
```
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## 增加层级
combo 还有一个作用是增加层级,比如返回的数据是一个深层对象
```json
{
"a": {
"b": "data"
}
}
```
如果要用文本框显示name 必须是 `a.b`,但使用 combo 创建层级后name 就可以只是 `b`
```json
{
"name": "a",
"type": "combo",
"label": "",
"noBorder": true,
"multiLine": true,
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"items": [
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{
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"type": "input-text",
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"name": "b"
}
]
}
```
这样就能结合 [definitions](../../../docs/types/definitions#树形结构) 实现无限层级结构。
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## 唯一验证
可以在配置的`body`项上,配置`"unique": true`,指定当前表单项不可重复
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```schema: scope="body"
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{
"type": "form",
"debug": true,
"mode": "horizontal",
"api": "/api/mock2/form/saveForm",
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"body": [
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{
"type": "combo",
"name": "combo666",
"label": "唯一",
"multiple": true,
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"items": [
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{
"name": "text",
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"type": "input-text",
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"placeholder": "文本",
"unique": true
},
{
"name": "select",
"type": "select",
"options": [
"a",
"b",
"c"
],
"unique": true
}
]
}
]
}
```
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上例中,`text`和`select`都配置了`"unique": true`,新增多条 combo在任意两个`text`输入框的值相同时,提交时都会报错`"当前值不唯一"`,而`select`选择框也不可选择重复的选项
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> 暂不支持 `Nested-Select` 组件
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## 拖拽排序
多选模式下,可以配置`"draggable": true`实现拖拽调整排序
```schema: scope="body"
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{
"type": "form",
"debug": true,
"mode": "horizontal",
"api": "/api/mock2/form/saveForm",
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"body": [
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{
"type": "combo",
"name": "combo",
"label": "拖拽排序",
"multiple": true,
"value": [
{
"text": "1",
"select": "a"
},
{
"text": "2",
"select": "b"
}
],
"draggable": true,
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"items": [
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{
"name": "text",
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"type": "input-text"
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},
{
"name": "select",
"type": "select",
"options": [
"a",
"b",
"c"
]
}
]
}
]
}
```
## 条件分支
默认 Combo 渲染的成员是固定表单项的,成员的类型时一致,如果不一致怎么办?这里可以设置条件分支来给不同的成员设置不同的表单项。
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如下面的例子,定义了两种类型:文本和数字,用户新增的时候可以选择是新增文本还是数字。区分是文字和数字的方式是根据成员数据中的 type 字段来决定。
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```schema: scope="form-item2"
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{
"type": "combo",
"name": "combo-conditions2",
"label": "多选",
"value": [
{
"type": "text"
}
],
"multiLine": true,
"multiple": true,
"typeSwitchable": false,
"conditions": [
{
"label": "文本",
"test": "this.type === \"text\"",
"scaffold": {
"type": "text",
"label": "文本",
"name": ""
},
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"items": [
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{
"label": "名称",
"name": "label",
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"type": "input-text"
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},
{
"label": "字段名",
"name": "name",
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"type": "input-text"
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}
]
},
{
"label": "数字",
"test": "this.type === \"number\"",
"scaffold": {
"type": "number",
"label": "数字",
"name": ""
},
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"items": [
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{
"label": "名称",
"name": "label",
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"type": "input-text"
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},
{
"label": "字段名",
"name": "name",
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"type": "input-text"
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},
{
"label": "最小值",
"name": "min",
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"type": "input-number"
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},
{
"label": "最大值",
"name": "max",
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"type": "input-number"
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},
{
"label": "步长",
"name": "step",
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"type": "input-number"
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}
]
}
]
}
```
- `conditions` Array<Condition> 数组,每个成员是一种类型
- `conditions[x].label` 类型名称
- `conditions[x].test` 表达式,目标成员数据是否属于这个类型?
- `conditions[x].scaffold` 初始数据,当新增的时候直接使用此数据。
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- `conditions[x].items` 该类型的表单设置。
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- `typeSwitchable` 类型是否允许切换,如果设置成 true 会多一个类型切换的按钮。
## Tabs 模式
默认成员是一个一个排列的,如果数据比较多有点让人眼花缭乱。所以 Combo 支持了 tabs 的排列方式。
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```schema: scope="form-item2"
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{
"type": "combo",
"name": "combo101",
"label": "组合多条多行",
"multiple": true,
"multiLine": true,
"value": [
{}
],
"tabsMode": true,
"tabsStyle": "card",
"maxLength": 3,
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"items": [
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{
"name": "a",
"label": "文本",
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"type": "input-text",
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"placeholder": "文本",
"value": "",
"size": "full"
},
{
"name": "b",
"label": "选项",
"type": "select",
"options": [
"a",
"b",
"c"
],
"size": "full"
}
]
}
```
- `tabsMode` boolean 用来开启此模式
- `tabsStyle` string 样式,可选:`line`、`card` 或者 `radio`.
- `tabsLabelTpl` 用来生成标题的模板,默认为:`成员 ${index|plus}`
注意:这是新引入的功能,目前还不支持拖拽组合使用。且此模式只有多选时才能生效。
## 获取父级数据
默认情况下Combo 内表达项无法获取父级数据域的数据,如下,我们添加 Combo 表单项时,尽管 Combo 内的文本框的`name`与父级数据域中的`super_text`变量同名,但是没有自动映射值。
```schema: scope="body"
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{
"type": "form",
"debug": true,
"mode": "horizontal",
"api": "/api/mock2/form/saveForm",
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"body": [
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{
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"type": "input-text",
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"label": "父级文本框",
"name": "super_text",
"value": "123"
},
{
"type": "combo",
"name": "combo1",
"label": "不可获取父级数据",
"multiple": true,
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"items": [
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{
"name": "super_text",
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"type": "input-text"
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}
]
}
]
}
```
可以配置`"canAccessSuperData": true`开启此特性,如下,配置了该配置项后,添加 Combo 的`text`表单项会自动映射父级数据域的同名变量
```schema: scope="body"
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{
"type": "form",
"debug": true,
"mode": "horizontal",
"api": "/api/mock2/form/saveForm",
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"body": [
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{
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"type": "input-text",
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"label": "父级文本框",
"name": "super_text",
"value": "123"
},
{
"type": "combo",
"name": "combo2",
"label": "可获取父级数据",
"multiple": true,
"canAccessSuperData": true,
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"items": [
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{
"name": "super_text",
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"type": "input-text"
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}
]
}
]
}
```
## 同步更新内部表单项
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配置`canAccessSuperData`可以获取父级数据域值,但是为了效率,在父级数据域变化的时候,默认 combo 内部是不会进行同步的
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如下,添加一组 combo然后可以看到默认会映射父级变量值`123`,但是当你在更改父级数据域`super_text`文本框值后combo 内部文本框并没有同步更新
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```schema: scope="body"
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{
"type": "form",
"debug": true,
"mode": "horizontal",
"api": "/api/mock2/form/saveForm",
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"body": [
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{
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"type": "input-text",
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"label": "父级文本框",
"name": "super_text",
"value": "123"
},
{
"type": "combo",
"name": "combo2",
"label": "可获取父级数据",
"multiple": true,
"canAccessSuperData": true,
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"items": [
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{
"name": "super_text",
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"type": "input-text"
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}
]
}
]
}
```
如果想实现内部同步更新,需要如下配置:
- 配置`"strictMode": false`
- 配置`syncFields`字符串数组,数组项是需要同步的变量名
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以上面为例,我们在 combo 上配置`"strictMode": false`和`"syncFields": ["super_text"]`,即可实现同步
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```schema: scope="body"
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{
"type": "form",
"debug": true,
"mode": "horizontal",
"api": "/api/mock2/form/saveForm",
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"body": [
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{
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"type": "input-text",
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"label": "父级文本框",
"name": "super_text",
"value": "123"
},
{
"type": "combo",
"name": "combo2",
"label": "可获取父级数据",
"multiple": true,
"canAccessSuperData": true,
"strictMode": false,
"syncFields": ["super_text"],
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"items": [
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{
"name": "super_text",
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"type": "input-text"
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}
]
}
]
}
```
## 设置序号
默认 Combo 数据域中,每一项会有一个隐藏变量`index`,可以利用 Tpl 组件,显示当前项序号
```schema: scope="body"
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{
"type": "form",
"debug": true,
"mode": "horizontal",
"api": "/api/mock2/form/saveForm",
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"body": [
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{
"type": "combo",
"name": "combo",
"label": "显示序号",
"multiple": true,
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"items": [
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{
"type": "tpl",
"tpl": "<%= this.index + 1%>",
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"className": "p-t-xs",
"mode": "inline"
},
{
"name": "text",
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"type": "input-text"
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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
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| 属性名 | 类型 | 默认值 | 说明 |
| ------------------------ | ------------------------------ | ---------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| formClassName | `string` | | 单组表单项的类名 |
| addButtonClassName | `string` | | 新增按钮 CSS 类名 |
| items | Array<[表单项](./formitem)> | | 组合展示的表单项 |
| items[x].columnClassName | `string` | | 列的类名,可以用它配置列宽度。默认平均分配。 |
| items[x].unique | `boolean` | | 设置当前列值是否唯一,即不允许重复选择。 |
| noBorder | `boolean` | `false` | 单组表单项是否显示边框 |
| scaffold | `object` | `{}` | 单组表单项初始值 |
| multiple | `boolean` | `false` | 是否多选 |
| multiLine | `boolean` | `false` | 默认是横着展示一排,设置以后竖着展示 |
| minLength | `number` | | 最少添加的条数 |
| maxLength | `number` | | 最多添加的条数 |
| flat | `boolean` | `false` | 是否将结果扁平化(去掉 name),只有当 items 的 length 为 1 且 multiple 为 true 的时候才有效。 |
| joinValues | `boolean` | `true` | 默认为 `true` 当扁平化开启的时候,是否用分隔符的形式发送给后端,否则采用 array 的方式。 |
| delimiter | `string` | `false` | 当扁平化开启并且 joinValues 为 true 时,用什么分隔符。 |
| addable | `boolean` | `false` | 是否可新增 |
| addButtonText | `string` | `"新增"` | 新增按钮文字 |
| removable | `boolean` | `false` | 是否可删除 |
| deleteApi | [API](../../../docs/types/api) | | 如果配置了,则删除前会发送一个 api请求成功才完成删除 |
| deleteConfirmText | `string` | `"确认要删除?"` | 当配置 `deleteApi` 才生效!删除时用来做用户确认 |
| draggable | `boolean` | `false` | 是否可以拖动排序, 需要注意的是当启用拖动排序的时候,会多一个\$id 字段 |
| draggableTip | `string` | `"可通过拖动每行中的【交换】按钮进行顺序调整"` | 可拖拽的提示文字 |
| subFormMode | `string` | `"normal"` | 可选`normal`、`horizontal`、`inline` |
| placeholder | `string` | `` | 没有成员时显示。 |
| canAccessSuperData | `boolean` | `false` | 指定是否可以自动获取上层的数据并映射到表单项上 |
| conditions | `object` | | 数组的形式包含所有条件的渲染类型,单个数组内的`test` 为判断条件,数组内的`items`为符合该条件后渲染的`schema` |
| typeSwitchable | `boolean` | `false` | 是否可切换条件,配合`conditions`使用 |
| strictMode | `boolean` | `true` | 默认为严格模式,设置为 false 时,当其他表单项更新是,里面的表单项也可以及时获取,否则不会。 |
| syncFields | `Array<string>` | `[]` | 配置同步字段。只有 `strictMode``false` 时有效。如果 Combo 层级比较深,底层的获取外层的数据可能不同步。但是给 combo 配置这个属性就能同步下来。输入格式:`["os"]` |
| nullable | `boolean` | `false` | 允许为空,如果子表单项里面配置验证器,且又是单条模式。可以允许用户选择清空(不填)。 |