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https://github.com/ericvaladas/react-uncontrolled-form
A 2kb library for building forms and validation with uncontrolled fields in React.
https://github.com/ericvaladas/react-uncontrolled-form
fields form react uncontrolled validation
Last synced: about 1 month ago
JSON representation
A 2kb library for building forms and validation with uncontrolled fields in React.
- Host: GitHub
- URL: https://github.com/ericvaladas/react-uncontrolled-form
- Owner: ericvaladas
- License: mit
- Created: 2016-08-30T01:24:49.000Z (almost 8 years ago)
- Default Branch: master
- Last Pushed: 2023-01-03T16:34:58.000Z (over 1 year ago)
- Last Synced: 2024-05-09T06:57:59.460Z (about 2 months ago)
- Topics: fields, form, react, uncontrolled, validation
- Language: JavaScript
- Homepage:
- Size: 813 KB
- Stars: 6
- Watchers: 1
- Forks: 1
- Open Issues: 17
-
Metadata Files:
- Readme: README.md
- License: LICENSE
Lists
- awesome-react-render-props - react-uncontrolled-form
- awesome-react-render-props - react-uncontrolled-form
README
# React Uncontrolled Form
A 2kb library for building forms and validation with uncontrolled fields in React.
[](https://badge.fury.io/js/react-uncontrolled-form)
[](https://travis-ci.org/ericvaladas/react-uncontrolled-form)
[](https://coveralls.io/github/ericvaladas/react-uncontrolled-form?branch=master)
[](https://david-dm.org/ericvaladas/react-uncontrolled-form)
[](https://david-dm.org/ericvaladas/react-uncontrolled-form?type=dev)
[](https://unpkg.com/react-uncontrolled-form/dist/react-uncontrolled-form.min.js)
## Usage
Install the package with npm.
```sh
npm install --save react-uncontrolled-form
```
Import the `Field` and `Form` components.
```js
import { Field, Form } from 'react-uncontrolled-form';
```
### Example
```js
class MyForm extends React.Component {
handleSubmit(form) {
}
render() {
return (
this.handleSubmit(form)}>
{() =>
}
{state =>
{state.message}
}
Submit
);
}
}
```
### CodeSandbox Examples
- [Field Validation](https://codesandbox.io/s/vvryvlrn95)
- [Form Validation](https://codesandbox.io/s/o9085ml0y9)
- [Inital Values](https://codesandbox.io/s/48w9noq1lx)
### Field Component
The `Field` component requires its children to be a function that returns JSX. When a `Field` renders it will call the children function, passing `state` and `validate` as arguments, and render the output. During the render, if an element with a `name` attribute is found, it will be registered with the `Form` and have the necessary props passed to it.
### Form Component
The `Form` component will render a `` element and validate its `Field` components on submission. A `form` prop, containing essential field registration functions, is automatically passed to all child components to be used by the `Field` component. If you nest a `Field` component inside another component, you must pass along the `form` prop to it.
### Form Submission
When a form is submitted, all fields will have their validators run. The `onSubmit` event handler is passed an object containing the form's validity, values, and invalid fields.
```js
class MyForm extends React.Component {
handleSubmit(form) {
if (form.valid) {
console.log('Form values:', form.values);
}
},
render() {
return (
this.handleSubmit(form)}>
{() =>
}
Submit
);
}
}
```
### Initial Values
You can pass initial values to your fields by adding the `values` prop to the `Form`.
```js
class MyForm extends React.Component {
render() {
const values = {
firstName: 'Eric',
lastName: 'Valadas'
};
return (
{() =>
}
{() =>
}
);
}
}
```
### Validators
Validators are simply functions that return an error message.
```js
function minLength(length) {
return value => {
if (!value || value.length < length) {
return `Must be at least ${length} characters`;
}
};
}
class MyForm extends React.Component {
render() {
return (
{state =>
{state.message}
}
);
}
}
```
The validation message will be passed to your Field component via `state.message`. If a validator does not return a message, the field is considered valid.
```js
class MyForm extends React.Component {
render() {
return (
{state =>
Username
{state.message}
}
);
}
};
```
### Validation
All fields have a `validate` function that will call each validator in the `validators` prop. By default, `validate` is only called when the form is submitted. However, this function is passed to the render prop and can be called whenever you like. Here's an example of validating a field as you type.
```js
class MyForm extends React.Component {
render() {
return (
{(state, validate) =>
{state.message}
}
);
}
}
```
You can also add field messages to your form which can be useful for things like server-side validation errors after submitting the form.
```js
class MyForm extends React.Component {
constructor(props) {
super(props);
this.state = {messages: {}};
}
handleSubmit() {
this.setState({
messages: {username: 'Username already exists'}
});
},
render() {
return (
this.handleSubmit(form)}>
{state =>
{state.message}
}
);
}
}
```
#### Field Dependant Validation
If you need access to another field's value for validation, you can do so by adding a `ref` to your form. To retrieve the value, call the form's `values` function.
```js
function match(compareValue, fieldName) {
return value => {
if (compareValue() !== value) {
return fieldName + ' does not match';
}
};
}
class MyForm extends React.Component {
render() {
return (
this.form = form}>
{() =>
}
this.form.values().email, 'Email')]}
exclude={true}
>
{state =>
{state.message}
}
);
}
}
```
### Nested Components
The `Form` component uses a `form` prop to provide field registration functions, initial values, and messages to its child components. If you want to nest a `Field` component inside another component, you will need to pass the `form` prop manually.
```js
class MyComponent extends React.Component {
render() {
return (
{() =>
}
);
}
}
class MyForm extends React.Component {
render() {
}
}
```
### Transform
The value of any field can be transformed by passing a `transform` prop to the `Field` component. For example, a checkbox input will have the value `"on"` if no value is provided, but it can be changed to a boolean value if that is preferred.
```js
class MyForm extends React.Component {
render() {
return (
Boolean(value)}>
{() =>
I agree to the terms
}
);
}
}
```
### Custom Change Events
If you create a custom input, or use a component like [react-select](https://github.com/JedWatson/react-select), which passes a custom value to the `onChange` handler, the `Field` component will still register the value. The field's value will be set to the argument passed to `onChange`. The `Field` component passes an `onChange` prop to the child with a `name` attribute, so you do not need to set one yourself.
#### React-Select
With the use of a couple optional props, react-select works just as you'd expect. In this example, `simpleValue` and `multi` set to `true` will produce a value of `"one,two"`. Using this in combination with the `transform` prop on the `Field`, a value of `["one", "two"]` can be achieved.
```js
class MyForm extends React.Component {
render() {
value.split(',')}>
{state =>
}
}
}
```
### Form Props
| Prop | Description |
| --- | --- |
| [`onSubmit`](#form-submission) | A callback function
`onSubmit({valid: [bool], values: {...}, invalidFields: {...}}` |
| [`values`](#initial-values) | An object that will provide values to the form's fields |
| [`messages`](#validation) | An object that will provide messages to the form's fields |
### Field Props
| Prop | Description |
| --- | --- |
| `form` | An object containing the form's registration functions, initial values, and messages |
| `validators` | An array containing the field's [validators](#validators) |
| `exclude` | A boolean that, when set to `true`, will exclude this field from the form's values |
| [`transform`](#transform) | A function to transform the field's value |