prompt-checkbox

prompt-checkbox

Multiple-choice/checkbox prompt. Can be used standalone or with a prompt system like Enquirer.

Install

Install with npm:

$ npm install --save prompt-checkbox

Usage

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.

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

Choice groups

Easy to configure!

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

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.

Code example

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.

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. (Any other options from 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):

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):

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.

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).

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, the following keypress offer different behavior that is specific to checklists:

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

Usage with enquirer

Register the prompt with enquirer:

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

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

Enquirer examples

For formatting questions, enquirer supports either:

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

Inquirer-style questions

Declarative questions format, similar to inquirer.

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:

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.

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: Intuitive, plugin-based prompt system for node.js. | homepage
• prompt-base: Base prompt module used for creating custom prompts. | homepage
• prompt-choices: Create an array of multiple choice objects for use in prompts. | homepage
• prompt-question: Question object, used by Enquirer and prompt plugins. | homepage

Contributing

Pull requests and stars are always welcome. For bugs and feature requests, please create an issue.

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:

$ npm install && npm test

Author

Jon Schlinkert

• github/jonschlinkert
• twitter/jonschlinkert

License

Copyright © 2017, Jon Schlinkert. Released under the MIT License.

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