# Radio buttons

[Radio buttons](https://www.google.com/design/spec/components/selection-controls.html#selection-controls-radio-button) allow the user to select one option from a set. Use radio buttons for exclusive selection if you think that the user needs to see all available options side-by-side. Otherwise, consider a dropdown, which uses less space than displaying all options. They should always be used along with `RadioGroup`.

<!-- example -->
```jsx
import { RadioGroup, RadioButton } from 'react-toolbox';

const RadioTest = () => (
  <RadioGroup ref='group' name='comic' value='vvendetta'>
    <RadioButton label='The Walking Dead' value='thewalkingdead'/>
    <RadioButton label='From Hell' value='fromhell' disabled/>
    <RadioButton label='V for a Vendetta' value='vvendetta'/>
    <RadioButton label='Watchmen' value='watchmen'/>
  </RadioGroup>
);
```

## Radio Group

A radio selector is mean to get a value from a set of choices, that's why a radio group is needed. It can take some properties and actions that will be transferred to the children, but they also can behave independently.

| Name              | Type          | Default         | Description|
|:-----|:-----|:-----|:-----|
| `className`   | `String`    |  `''`    | Set a class to give custom styles to the group.| 
| `disabled`   | `Boolean`    |  `false`    | If true, the group will be displayed as disabled.| 
| `name`    | `String`    |  | Name for the input element group. |
| `onChange`    | `Function`    |   | Callback function that will be invoked when the value changes. |
| `value`    | `Any`    |  | Default value selected in the radio group. |

This component has state to keep the currently selected value and that's why it exposes to methods to work from the code with it:
- `getValue` used to retrieve the currently selected value.
- `setValue` used to set a new value.

## Radio Button

The inner component to compose radio selectors. They will be rendered as radio input elements of HTML transferring the given properties that concerns to them.

| Name              | Type          | Default         | Description|
|:-----|:-----|:-----|:-----|
| `checked`   | `Boolean`    |  `false`    | If true, the input element will be selected by default. Transferred from the parent. | 
| `className`   | `String`    |  `''`    | Set a class to give custom styles to the radio button.| 
| `disabled`   | `Boolean`    |  `false`    | If true, the item will be displayed as disabled.| 
| `name`    | `String`    |  | Name for the input element. |
| `onBlur`    | `Function`    |   | Callback function that will be invoked when the input is blurred. |
| `onChange`    | `Function`    |   | Callback function that will be invoked when the value changes. |
| `onFocus`    | `Function`    |   | Callback function that will be invoked when the input is focused. |
| `value`    | `Any`    |  | Value for the radio button. |