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## API
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### Form
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| Property | Description | Type | Default Value |
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| -------- | ----------- | ---- | ------------- |
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| form | Decorated by `Form.create()` will be automatically set `this.form` property, so just pass to form. If you use the template syntax, you can use `this.$form.createForm(this, options)` | object | n/a |
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| hideRequiredMark | Hide required mark of all form items | Boolean | false |
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| layout | Define form layout | 'horizontal'\|'vertical'\|'inline' | 'horizontal' |
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| autoFormCreate(deprecated) | Automate Form.create, Recommended for use under the `template` component, and cannot be used with `Form.create()`. You should use `$form.createForm` to instead it after 1.1.9. |Function(form)| |
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| options(deprecated) | The `options` corresponding to `Form.create(options)`. You should use `$form.createForm` to instead it after 1.1.9. | Object | {} |
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### Events
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| Events Name | Description | Arguments |
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| --- | --- | --- |
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| submit | Defines a function will be called if form data validation is successful. | Function(e:Event) |
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### Form.create(options) \| this.$form.createForm(this, options)
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How to use：
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#### Used in jsx, the usage is consistent with the React version of antd
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```jsx
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const CustomizedForm = {}
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CustomizedForm = Form.create({})(CustomizedForm);
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```
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Maintain an ref for wrapped component instance, use `wrappedComponentRef`.
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#### Single file template usage
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````html
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<template>
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<a-form :form="form" />
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</template>
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<script>
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export default {
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beforeCreate () {
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this.form = this.$form.createForm(this, options)
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},
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}
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</script>
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````
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The following `options` are available:
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| Property | Description | Type |
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| -------- | ----------- | ---- |
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| props | Only supports the use of Form.create({})(CustomizedForm). declare props on form(和[like vue props]( https://vuejs.org/v2/api/#props)) | {} |
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| mapPropsToFields | Convert props to field value(e.g. reading the values from Redux store). And you must mark returned fields with [`Form.createFormField`](#Form.createFormField). If you use `$form.createForm` to create a collector, you can map any data to the Field without being bound by the parent component. | (props) => Object{ fieldName: FormField { value } } |
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| validateMessages | Default validate message. And its format is similar with [newMessages](https://github.com/yiminghe/async-validator/blob/master/src/messages.js)'s returned value | Object { [nested.path]: String } |
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| onFieldsChange | Specify a function that will be called when the value a `Form.Item` gets changed. Usage example: saving the field's value to Redux store. | Function(props, fields) |
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| onValuesChange | A handler while value of any field is changed | (props, values) => void |
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If the form has been decorated by `Form.create` then it has `this.form` property. `this.form` provides some APIs as follows:
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> Note: Before using `getFieldsValue` `getFieldValue` `setFieldsValue` and so on, please make sure that corresponding field had been registered with `getFieldDecorator`.
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| Method | Description | Type |
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| ------ | ----------- | ---- |
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| getFieldDecorator | Two-way binding for form, single file template can be bound using the directive `v-decorator`. please read below for details. | |
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| getFieldError | Get the error of a field. | Function(name) |
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| getFieldsError | Get the specified fields' error. If you don't specify a parameter, you will get all fields' error. | Function(\[names: string\[]]) |
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| getFieldsValue | Get the specified fields' values. If you don't specify a parameter, you will get all fields' values. | Function(\[fieldNames: string\[]]) |
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| getFieldValue | Get the value of a field. | Function(fieldName: string) |
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| isFieldsTouched | Check whether any of fields is touched by `getFieldDecorator`'s `options.trigger` event | (names?: string\[]) => boolean |
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| isFieldTouched | Check whether a field is touched by `getFieldDecorator`'s `options.trigger` event | (name: string) => boolean |
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| isFieldValidating | Check if the specified field is being validated. | Function(name) |
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| resetFields | Reset the specified fields' value(to `initialValue`) and status. If you don't specify a parameter, all the fields will be reset. | Function(\[names: string\[]]) |
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| setFields | Set value and error state of fields. | ({<br /> \[fieldName\]: {value: any, errors: \[Error\] }<br />}) => void |
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| setFieldsValue | Set the value of a field. | Function({ [fieldName]: value } |
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| validateFields | Validate the specified fields and get theirs values and errors. If you don't specify the parameter of fieldNames, you will validate all fields. | (<br /> \[fieldNames: string\[]],<br /> \[options: object\],<br /> callback(errors, values)<br />) => void |
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| validateFieldsAndScroll | This function is similar to `validateFields`, but after validation, if the target field is not in visible area of form, form will be automatically scrolled to the target field area. | same as `validateFields` |
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### validateFields/validateFieldsAndScroll
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```jsx
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const { form: { validateFields } } = this;
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validateFields((errors, values) => {
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// ...
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});
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validateFields(['field1', 'field2'], (errors, values) => {
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// ...
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});
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validateFields(['field1', 'field2'], options, (errors, values) => {
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// ...
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});
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```
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| Method | Description | Type | Default |
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| ------ | ----------- | ---- | ------- |
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| options.first | If `true`, every field will stop validation at first failed rule | boolean | false |
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| options.firstFields | Those fields will stop validation at first failed rule | String\[] | \[] |
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| options.force | Should validate validated field again when `validateTrigger` is been triggered again | boolean | false |
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| options.scroll | Config scroll behavior of `validateFieldsAndScroll`, more: [dom-scroll-into-view's config](https://github.com/yiminghe/dom-scroll-into-view#function-parameter) | Object | {} |
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#### Callback arguments example of validateFields
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- `errors`:
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```js
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{
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"userName": {
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"errors": [
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{
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"message": "Please input your username!",
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"field": "userName"
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}
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]
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},
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"password": {
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"errors": [
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{
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"message": "Please input your Password!",
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"field": "password"
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}
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]
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}
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}
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```
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- `values`:
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```js
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{
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"userName": "username",
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"password": "password",
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}
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```
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### Form.createFormField
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To mark the returned fields data in `mapPropsToFields`, [demo](#components-form-demo-global-state).
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### this.form.getFieldDecorator(id, options) and v-decorator="[id, options]"
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After wrapped by `getFieldDecorator` or `v-decorator`, `value`(or other property defined by `valuePropName`) `onChange`(or other property defined by `trigger`) props will be added to form controls，the flow of form data will be handled by Form which will cause:
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1. You shouldn't use `onChange` to collect data, but you still can listen to `onChange`(and so on) events.
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2. You cannot set value of form control via `value` `defaultValue` prop, and you should set default value with `initialValue` in `getFieldDecorator` instead.
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3. You shouldn't call `v-model` manually, please use `this.form.setFieldsValue` to change value programmatically.
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#### Special attention
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1. `getFieldDecorator` and `v-decorator` can not be used to decorate stateless component.
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2. you can't use `getFieldDecorator` and `v-decorator` in stateless component: <https://vuejs.org/v2/api/#functional>
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#### getFieldDecorator(id, options) and v-decorator="[id, options]" parameters
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| Property | Description | Type | Default Value |
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| -------- | ----------- | ---- | ------------- |
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| id | The unique identifier is required. support [nested fields format](https://github.com/react-component/form/pull/48). | string | |
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| options.getValueFromEvent | Specify how to get value from event or other onChange arguments | function(..args) | [reference](https://github.com/react-component/form#option-object) |
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| options.getValueProps | Get the component props according to field value. | function(value): any | [reference](https://github.com/react-component/form#option-object)
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| options.initialValue | You can specify initial value, type, optional value of children node. (Note: Because `Form` will test equality with `===` internally, we recommend to use variable as `initialValue`, instead of literal) | | n/a |
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| options.normalize | Normalize value to form component, [a select-all example](https://codesandbox.io/s/kw4l2vqqmv) | function(value, prevValue, allValues): any | - |
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| options.preserve | Keep the field even if field removed | boolean | false |
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| options.rules | Includes validation rules. Please refer to "Validation Rules" part for details. | object\[] | n/a |
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| options.trigger | When to collect the value of children node | string | 'change' |
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| options.validateFirst | Whether stop validate on first rule of error for this field. | boolean | false |
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| options.validateTrigger | When to validate the value of children node. | string\|string\[] | 'change' |
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| options.valuePropName | Props of children node, for example, the prop of Switch is 'checked'. | string | 'value' |
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### Form.Item
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Note: If Form.Item has multiple children that had been decorated by `getFieldDecorator` or `v-decorator`, `help` and `required` and `validateStatus` can't be generated automatically.
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| Property | Description | Type | Default Value |
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| colon | Used with `label`, whether to display `:` after label text. | boolean | true |
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| extra | The extra prompt message. It is similar to help. Usage example: to display error message and prompt message at the same time. | string\|slot | |
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| hasFeedback | Used with `validateStatus`, this option specifies the validation status icon. Recommended to be used only with `Input`. | boolean | false |
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| help | The prompt message. If not provided, the prompt message will be generated by the validation rule. | string\|slot | |
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| label | Label text | string\|slot | |
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| labelCol | The layout of label. You can set `span` `offset` to something like `{span: 3, offset: 12}` or `sm: {span: 3, offset: 12}` same as with `<Col>` | [object](/ant-design-vue/components/grid/#Col) | |
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| required | Whether provided or not, it will be generated by the validation rule. | boolean | false |
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| validateStatus | The validation status. If not provided, it will be generated by validation rule. options: 'success' 'warning' 'error' 'validating' | string | |
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| wrapperCol | The layout for input controls, same as `labelCol` | [object](/ant-design-vue/components/grid/#Col) | |
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### Validation Rules
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| Property | Description | Type | Default Value |
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| enum | validate a value from a list of possible values | string | - |
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| len | validate an exact length of a field | number | - |
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| max | validate a max length of a field | number | - |
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| message | validation error message | string | - |
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| min | validate a min length of a field | number | - |
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| pattern | validate from a regular expression | RegExp | - |
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| required | indicates whether field is required | boolean | `false` |
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| transform | transform a value before validation | function(value) => transformedValue:any | - |
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| type | built-in validation type, [available options](https://github.com/yiminghe/async-validator#type) | string | 'string' |
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| validator | custom validate function (Note: [callback must be called](https://github.com/ant-design/ant-design/issues/5155)) | function(rule, value, callback) | - |
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| whitespace | treat required fields that only contain whitespace as errors | boolean | `false` |
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See more advanced usage at [async-validator](https://github.com/yiminghe/async-validator).
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