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Highlights

Install

npm install @rc-component/form

The package was formerly documented as rc-field-form; use @rc-component/form for new installs.

Usage

import Form, { Field } from '@rc-component/form';

const Input = ({ value = '', ...props }) => <input value={value} {...props} />;

const Demo = () => {
  return (
    <Form
      onFinish={values => {
        console.log('Finish:', values);
      }}
    >
      <Field name="username">
        <Input placeholder="Username" />
      </Field>
      <Field name="password">
        <Input placeholder="Password" />
      </Field>

      <button>Submit</button>
    </Form>
  );
};

export default Demo;

Examples

Run the local dumi site:

npm install
npm start

Then open http://localhost:8000.

API

We use typescript to create the Type definition. You can view directly in IDE. But you can still check the type definition here.

Form

Field

List

useForm

Form creates a form instance with Form.useForm by default. You can also create the instance yourself and pass it to Form to call methods directly.

const Demo = () => {
  const [form] = Form.useForm();
  return <Form form={form} />;
};

For class components, use ref to get the form instance:

class Demo extends React.Component {
  setRef = form => {
    // Form instance here
  };
  render() {
    return <Form ref={this.setRef} />;
  }
}

FormProvider

Interface

NamePath

FieldData

Rule

validator

To keep sync with rc-form legacy usage of validator, we still provides callback to trigger validate finished. But in rc-field-form, we strongly recommend to return a Promise instead.

ListOperations

ValidateMessages

Validate Messages provides a list of error template. You can ref here for fully default templates.

Different with rc-form

rc-field-form is try to keep sync with rc-form in api level, but there still have something to change:

1. Field will not keep snyc with initialValues when un-touched

In rc-form, field value will get from initialValues if user not operate on it. It's a bug but user use as a feature which makes fixing will be a breaking change and we have to keep it. In Field Form, this bug will not exist anymore. If you want to change a field value, use setFieldsValue instead.

2. Remove Field will not clean up related value

We do lots of logic to clean up the value when Field removed before. But with user feedback, remove exist value increase the additional work to keep value back with conditional field.

3. Nest name use array instead of string

In rc-form, we support like user.name to be a name and convert value to { user: { name: 'Bamboo' } }. This makes '.' always be the route of variable, this makes developer have to do additional work if name is real contains a point like app.config.start to be app_config_start and parse back to point when submit.

Field Form will only trade ['user', 'name'] to be { user: { name: 'Bamboo' } }, and user.name to be { ['user.name']: 'Bamboo' }.

4. Remove validateFieldsAndScroll

Since findDomNode is marked as warning in StrictMode. It seems over control of Form component. We decide to remove validateFieldsAndScroll method and you should handle it with you own logic:

<Form>
  <Field name="username">
    <input ref={this.inputRef} />
  </Field>
</Form>

5. getFieldsError always return array

rc-form returns null when no error happen. This makes user have to do some additional code like:

(form.getFieldsError('fieldName') || []).forEach(() => {
  // Do something...
});

Now getFieldsError will return [] if no errors.

6. Remove callback with validateFields

Since ES8 is support async/await, that's no reason not to use it. Now you can easily handle your validate logic:

async function() {
  try {
    const values = await form.validateFields();
    console.log(values);
  } catch (errorList) {
    errorList.forEach(({ name, errors }) => {
      // Do something...
    });
  }
}

Notice: Now if your validator return an Error(message), not need to get error by e => e.message. FieldForm will handle this.

7. preserve is default to false

In rc-form you should use preserve to keep a value cause Form will auto remove a value from Field removed. Field Form will always keep the value in the Form whatever Field removed. But you can still use preserve=false to disable value keeping since 1.5.0.

8. setFields not trigger onFieldsChange and setFieldsValue not trigger onValuesChange

In rc-form, we hope to help user auto trigger change event by setting to make redux dispatch easier, but it's not good design since it makes code logic couping.

Additionally, user control update trigger onFieldsChange & onValuesChange event has potential dead loop risk.

Development

npm install
npm start
npm test
npm run lint
npm run tsc
npm run compile
npm run build

The dumi site runs at http://localhost:8000 by default.

Release

npm run prepublishOnly

The release flow is handled by @rc-component/np through the rc-np command after the package build.

License

@rc-component/form is released under the MIT license.