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prompt-checkbox

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# prompt-checkbox [![NPM version](https://img.shields.io/npm/v/prompt-checkbox.svg?style=flat)](https://www.npmjs.com/package/prompt-checkbox) [![NPM monthly downloads](https://img.shields.io/npm/dm/prompt-checkbox.svg?style=flat)](https://npmjs.org/package/prompt-checkbox) [![NPM total downloads](https://img.shields.io/npm/dt/prompt-checkbox.svg?style=flat)](https://npmjs.org/package/prompt-checkbox) [![Linux Build Status](https://img.shields.io/travis/enquirer/prompt-checkbox.svg?style=flat&label=Travis)](https://travis-ci.org/enquirer/prompt-checkbox)

> Multiple-choice/checkbox prompt. Can be used standalone or with a prompt system like [Enquirer](http://enquirer.io).

![prompt-checkbox example](https://raw.githubusercontent.com/enquirer/prompt-checkbox/master/docs/example.gif)

## Install

Install with [npm](https://www.npmjs.com/):

```sh
$ npm install --save prompt-checkbox
```

## Usage

```js
var Prompt = require('prompt-checkbox');
var prompt = new Prompt({
  name: 'colors',
  message: 'What are your favorite colors?',
  choices: [
    'red',
    'blue',
    'yellow'
  ]
});

// promises
prompt.run()
  .then(function(answers) {
    console.log(answers)
  })
  .catch(function(err) {
    console.log(err)
  })

// async
prompt.ask(function(answers) {
  console.log(answers)
});
```

## Special features

Features you won't find with other prompts!

### Choices function

Define choices as a function. This allows you to dynamically generate the choices when the question is asked.

```js
var prompt = new Prompt({
  name: 'colors',
  message: 'What are your favorite colors?',
  choices: function() {
    // dynamically build choices 
    return ['red', 'blue', 'green'];
  }
});
```

### Choice groups

![Choices groups](https://raw.githubusercontent.com/enquirer/prompt-checkbox/master/docs/choice-groups.gif)

**Easy to configure!**

Just pass an object of arrays on `choices`, and each key in the object will be used as the group "toggle":

```js
var Prompt = require('prompt-checkbox');
var prompt = new Prompt({
  name: 'install',
  message: 'Which packages do you want to install?',
  choices: {
    dependencies: ['generate', 'micromatch'],
    devDependencies: ['mocha', 'kind-of']
  }
});
```

### Radio choices

Adds `all` and `none` choices, which select or deselect all choices, respectively. Named "radio choices" since it acts like a hybrid between checkboxes and radio buttons.

<br>

![radio choices](https://raw.githubusercontent.com/enquirer/prompt-checkbox/master/docs/radio-choices.gif)

**Code example**

```js
var Prompt = require('prompt-checkbox');
var prompt = new Prompt({
  name: 'install',
  message: 'Which packages do you want to install?',
  radio: true,
  choices: ['foo', 'bar', 'baz']
});
```

### Radio groups

Use "radio" choices with choice groups.

<br>

![radio groups](https://raw.githubusercontent.com/enquirer/prompt-checkbox/master/docs/radio-groups.gif)

```js
var Prompt = require('prompt-checkbox');
var prompt = new Prompt({
  name: 'install',
  message: 'Which packages do you want to install?',
  radio: true,
  choices: {
    dependencies: ['generate', 'micromatch'],
    devDependencies: ['mocha', 'kind-of']
  }
});
```

## options

The following options are either specific to prompt-checkbox, or have behavior that differs in some way from the built-in options from [prompt-base](https://github.com/enquirer/prompt-base). _(Any other options from [prompt-base](https://github.com/enquirer/prompt-base) may be used as well.)_

### options.default

**Type**: `string|number|array`

**Default**: `undefined`

Specify the "default" choices to check when the prompt is initialized. Default can be a choice name (string), index (number), or an array of choice names or indices.

**Examples**

Specify default as a string (choice name):

```js
var prompt = new Prompt({
  name: 'colors',
  message: 'Best flavor?',
  default: 'chocolate',
  choices: ['chocolate'] // <= hmm, I wonder what they'll choose?
});
```

Specify an array of defaults (choice names or indices):

```js
var prompt = new Prompt({
  name: 'colors',
  message: 'Favorite colors?',
  default: [1, 'blue'],
  choices: ['red', 'blue', 'yellow']
});
```

### options.radio

**Type**: `boolean`

**Default**: `undefined`

Enable hybrid radio-checkbox support, which adds `all` and `none` radio options for toggling all options on and off.

```js
var Prompt = require('prompt-checkbox');
var prompt = new Prompt({
  name: 'colors',
  message: 'What are your favorite colors?',
  radio: true,
  choices: [
    'red',
    'blue',
    'yellow'
  ]
});
```

### options.transform

**Type**: `function`

**Default**: `undefined`

Modify answer values before they're returned.

**Example**

Use `options.transform` and the `prompt.choices.get()` method to convert answers (checked choices) to an array of objects (versus of an array of strings).

```js
var Prompt = require('prompt-checkbox');
var prompt = new Prompt({
  name: 'colors',
  message: 'What are your favorite colors?',
  choices: ['red', 'blue', 'yellow'],
  transform: function(answer) {
    // - "this" is the prompt instance
    // - "this.choices.get()" returns the choice object for each choice
    return answer ? answer.map(this.choices.get.bind(this.choices)) : [];
  }
});
```

## Keypresses

In addition to the keypresses that are supported by [prompt-base](https://github.com/enquirer/prompt-base), the following keypress offer different behavior that is specific to checklists:

* <kbd>down</kbd> - move the pointer (cursor) down one row for each keypress
* <kbd>up</kbd> - move the pointer (cursor) up one row for each keypress
* <kbd>i</kbd> - toggle all choices to the opposite of their current state.
* <kbd>a</kbd> - enable or disable all choices
* <kbd>space</kbd> - toggle a choice
* <kbd>number</kbd> - toggle the choice at the given index (starting at 1)

## Usage with [enquirer](http://enquirer.io)

Register the prompt with enquirer:

```js
var Enquirer = require('enquirer');
var enquirer = new Enquirer();

enquirer.register('checkbox', require('prompt-checkbox'));
```

### Enquirer examples

For formatting questions, [enquirer](http://enquirer.io) supports either:

* declarative, inquirer-style question format
* functional format using the `.question` method.

**Inquirer-style questions**

Declarative questions format, similar to `inquirer`.

```js
var questions = [
  {
    name: 'color',
    message: 'What is your favorite color?',
    type: 'checkbox',
    default: 'blue',
    choices: ['red', 'yellow', 'blue']
  }
];

enquirer.prompt(questions)
  .then(function(answers) {
    console.log(answers)
  });
```

Or:

```js
enquirer.prompt({
    name: 'color',
    message: 'What is your favorite color?',
    type: 'checkbox',
    default: 'blue',
    choices: ['red', 'yellow', 'blue']
  })
  .then(function(answers) {
    console.log(answers)
  });
```

**Functional-style questions**

Use the `.question` method to pre-register questions, so they can be called later. Also, the `message` may be passed as the second argument, or as a property on the question options.

```js
enquirer.question('letter', 'What are your favorite letters?', {
  type: 'checkbox', //<= specify the prompt type
  choices: ['a', 'b', 'c']
});

enquirer.question('numbers', {
  type: 'checkbox', //<= specify the prompt type
  message: 'What are your favorite numbers?',
  choices: ['1', '2', '3']
});

// pass the name(s) or questions to ask
enquirer.prompt(['letters', 'numbers'])
  .then(function(answers) {
    console.log(answers)
  });
```

## About

### Related projects

* [enquirer](https://www.npmjs.com/package/enquirer): Intuitive, plugin-based prompt system for node.js. | [homepage](http://enquirer.io "Intuitive, plugin-based prompt system for node.js.")
* [prompt-base](https://www.npmjs.com/package/prompt-base): Base prompt module used for creating custom prompts. | [homepage](https://github.com/enquirer/prompt-base "Base prompt module used for creating custom prompts.")
* [prompt-choices](https://www.npmjs.com/package/prompt-choices): Create an array of multiple choice objects for use in prompts. | [homepage](https://github.com/enquirer/prompt-choices "Create an array of multiple choice objects for use in prompts.")
* [prompt-question](https://www.npmjs.com/package/prompt-question): Question object, used by Enquirer and prompt plugins. | [homepage](https://github.com/enquirer/prompt-question "Question object, used by Enquirer and prompt plugins.")

### Contributing

Pull requests and stars are always welcome. For bugs and feature requests, [please create an issue](../../issues/new).

### Running tests

Running and reviewing unit tests is a great way to get familiarized with a library and its API. You can install dependencies and run tests with the following command:

```sh
$ npm install && npm test
```

### Author

**Jon Schlinkert**

* [github/jonschlinkert](https://github.com/jonschlinkert)
* [twitter/jonschlinkert](https://twitter.com/jonschlinkert)

### License

***

_This file was generated by [verb-generate-readme](https://github.com/verbose/verb-generate-readme), v0.6.0, on July 08, 2017._

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