# Menus

1.  [Options](#options)
2.  [Overview](#overview)
3.  [onClick and isDisabled](#onclick-and-isdisabled)

## Options

| Name       | Description                                                |
| ---------- | ---------------------------------------------------------- |
| id         | A unique identifier, used to indicate selection            |
| label      | A user friendly label to show in the menu UI               |
| onClick    | Optionally, executed when an item is clicked               |
| isDisabled | A predicate to determine if a menu item should be disabled |

## Overview

Colonel Kurtz gives each block a menu. By default this menu allows a
user to change the position of a block or remove it.

Additional menu items can be added. This is handled within the
component definition for a block type. The following example
demonstrates how to add menu items; an additional example can be
found at `./example/blockTypes/Section.jsx`:

```javascript
import React from 'react'

export default class MenuExample extends React.Component {
  getMenuItems() {
    return [
      {
        id: 'hello-world',
        label: 'Hello World',
        onClick: (editor, block, menuItem) => alert('Hello, world!')
      }
    ]
  }

  render() {
    return <div>{this.props.children}</div>
  }
}
```

There are several things going on here:

1.  The UI for new menu items is described in the `getMenuItems` method
2.  Whenever a menu item is clicked, it will execute the `onClick` option

## onClick, label, and isDisabled

Menu items can also define an `onClick` and `isDisabled` field. Both
of these should be functions and are passed the specific editor and
block for the menu:

```javascript
getMenuItems() {
  return [{
    id         : 'hello-world',
    label      : 'Hello World',
    label      : (editor, block, menuItem) => `My special block ${block.id}`,
    onClick    : (editor, block, menuItem) => alert(`My block is ${ block.id }`),
    isDisabled : (editor, block, menuItem) => false
  }]
}
```

Another example:

```javascript
getMenuItems() {
  return [{
    id      : 'hello-world',
    label   : () => `Toggle position: ${this.positionLabel()}`
    onClick : () => this.togglePosition()
  }]
}
```