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outline: deep
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# Vben Form

`Vben Form` is the shared form abstraction used across different UI-library variants such as `Ant Design Vue`, `Element Plus`, `Naive UI`, and other adapters added inside this repository.

> If some details are not obvious from the docs, check the live demos as well.

## Adapter Setup

Each app keeps its own adapter layer under `src/adapter/form.ts` and `src/adapter/component/index.ts`.

The current adapter pattern is:

- initialize the shared component adapter first
- call `setupVbenForm(...)`
- map special `v-model:*` prop names through `modelPropNameMap`
- keep the form empty state aligned with the actual UI library behavior

### Form Adapter Example

```ts
import type {
  VbenFormSchema as FormSchema,
  VbenFormProps,
} from '@vben/common-ui';

import type { ComponentType } from './component';

import { setupVbenForm, useVbenForm as useForm, z } from '@vben/common-ui';
import { $t } from '@vben/locales';

import { initComponentAdapter } from './component';

initComponentAdapter();
setupVbenForm<ComponentType>({
  config: {
    baseModelPropName: 'value',
    emptyStateValue: null,
    modelPropNameMap: {
      Checkbox: 'checked',
      Radio: 'checked',
      Switch: 'checked',
      Upload: 'fileList',
    },
  },
  defineRules: {
    required: (value, _params, ctx) => {
      if (value === undefined || value === null || value.length === 0) {
        return $t('ui.formRules.required', [ctx.label]);
      }
      return true;
    },
    selectRequired: (value, _params, ctx) => {
      if (value === undefined || value === null) {
        return $t('ui.formRules.selectRequired', [ctx.label]);
      }
      return true;
    },
  },
});

const useVbenForm = useForm<ComponentType>;

export { useVbenForm, z };
export type VbenFormSchema = FormSchema<ComponentType>;
export type { VbenFormProps };
```

### Component Adapter Example

```ts
import type { Component, SetupContext } from 'vue';

import type { BaseFormComponentType } from '@vben/common-ui';

import { h } from 'vue';

import { globalShareState } from '@vben/common-ui';
import { $t } from '@vben/locales';
import {
  AutoComplete,
  Button,
  Checkbox,
  CheckboxGroup,
  DatePicker,
  Divider,
  Input,
  InputNumber,
  InputPassword,
  Mentions,
  notification,
  Radio,
  RadioGroup,
  RangePicker,
  Rate,
  Select,
  Space,
  Switch,
  Textarea,
  TimePicker,
  TreeSelect,
  Upload,
} from 'ant-design-vue';

const withDefaultPlaceholder = <T extends Component>(
  component: T,
  type: 'input' | 'select',
) => {
  return (props: any, { attrs, slots }: Omit<SetupContext, 'expose'>) => {
    const placeholder = props?.placeholder || $t(`ui.placeholder.${type}`);
    return h(component, { ...props, ...attrs, placeholder }, slots);
  };
};

export type ComponentType =
  | 'AutoComplete'
  | 'Checkbox'
  | 'CheckboxGroup'
  | 'DatePicker'
  | 'DefaultButton'
  | 'Divider'
  | 'Input'
  | 'InputNumber'
  | 'InputPassword'
  | 'Mentions'
  | 'PrimaryButton'
  | 'Radio'
  | 'RadioGroup'
  | 'RangePicker'
  | 'Rate'
  | 'Select'
  | 'Space'
  | 'Switch'
  | 'Textarea'
  | 'TimePicker'
  | 'TreeSelect'
  | 'Upload'
  | BaseFormComponentType;

async function initComponentAdapter() {
  const components: Partial<Record<ComponentType, Component>> = {
    AutoComplete,
    Checkbox,
    CheckboxGroup,
    DatePicker,
    DefaultButton: (props, { attrs, slots }) => {
      return h(Button, { ...props, attrs, type: 'default' }, slots);
    },
    Divider,
    Input: withDefaultPlaceholder(Input, 'input'),
    InputNumber: withDefaultPlaceholder(InputNumber, 'input'),
    InputPassword: withDefaultPlaceholder(InputPassword, 'input'),
    Mentions: withDefaultPlaceholder(Mentions, 'input'),
    PrimaryButton: (props, { attrs, slots }) => {
      return h(Button, { ...props, attrs, type: 'primary' }, slots);
    },
    Radio,
    RadioGroup,
    RangePicker,
    Rate,
    Select: withDefaultPlaceholder(Select, 'select'),
    Space,
    Switch,
    Textarea: withDefaultPlaceholder(Textarea, 'input'),
    TimePicker,
    TreeSelect: withDefaultPlaceholder(TreeSelect, 'select'),
    Upload,
  };

  globalShareState.setComponents(components);
  globalShareState.defineMessage({
    copyPreferencesSuccess: (title, content) => {
      notification.success({
        description: content,
        message: title,
        placement: 'bottomRight',
      });
    },
  });
}

export { initComponentAdapter };
```

## Basic Usage

Create the form through `useVbenForm`:

<DemoPreview dir="demos/vben-form/basic" />

## Key API Notes

- `useVbenForm` returns `[Form, formApi]`
- `formApi.getFieldComponentRef()` and `formApi.getFocusedField()` are available in current versions
- `handleValuesChange(values, fieldsChanged)` includes the second parameter in newer versions
- `fieldMappingTime` and `scrollToFirstError` are part of the current form props

## Reference

For the complete Chinese API tables and more examples, see the Chinese component page if you need the full parameter matrix.