AgeGate

Limit access to your app with an age gate that requests and validates your user's date of birth. For alcohol-related uses, it can also populate a <select> with countries, in order to validate against the local legal drinking age.

The package is designed for modularity and therefore makes zero assumptions about your frontend; You're responsible for the markup, style and any pre or post-validation action. Create the HTML and supply the <form> element to the AgeGate on intialization (along with desired options), and handle success/failure via the callback function.

100% pure JavaScript, and no dependencies.

Demo

izolate.github.io/agegate

Installation

Available on npm and is UMD-compatible.

$ npm i --save agegate

Usage

HTML

The maximum amount of markup you'll need is as follows. Keep the same name attributes:

<form name='agegate'>
  <input type='number' name='year'>
  <input type='number' name='month'>
  <input type='number' name='day'>

  <select name='country'></select>

  <input type='checkbox' name='remember' checked>

  <button type='submit'>Enter</button>
</form>

Description

<input type='number' name='year|month|day'>
Only year is required, but you can add the others to increase accuracy at the cost of your user's speed.

<input type='checkbox' name='remember'>
Lets your users decide whether to save the cookie to your desired expiration, the length of which you specify in the options. Left unchecked, the default behaviour will create a cookie that expires at the end of the session.

<select name='country'>
Only required if you set countries: true in the options. It will be populated with a list of countries to choose from.

JavaScript

import AgeGate from 'agegate';

let options = {
  form: document.querySelector('form'),
  countries: true,
  expiry: Infinity
}

let gate = new AgeGate(options, (err) => {
  if (err) throw new Error('You shall not pass');
  else console.log('Fly, you fools');
})

API

AgeGate(options, callback)

Create a new instance of the class, passing in the options object as first parameter and specifying a callback function as the second.

Instantiate it wherever appropriate (e.g. DOM ready) to start the age gate. An event listener will be added to the submit event for the specified form, and the <select> element will be populated with country data when required.

Options

Pass an Object as the first paramter, containing your desired options.

Name	Type	Default	Required	Description
age	number	18		Custom legal age to verify against. Overridden if countries is set to true
form	Element		✓	<form> DOM element
formValidation	boolean	false		Enable/disable JavaScript form field date validation
countries	boolean	false		For alcohol-related apps, validates age against minimum legal drinking age in selected country. Setting true enables the <select> list of countries to choose from
data	Array			Override the default and populate the <select> with your own data in the required data structure [1]
cookieExpiry	number, Infinity, Date	0		Sets the expiration of the cookie in seconds. 0 is session-only. Infinity is forever. Supply a Date object for any custom length of time
cookieDomain	String	null		Cookie path
cookieName	String	old_enough		Cookie name

[1] Format each country's data in an Object, and set the country order in the enclosing Array. For example:

data = [
  {
    name: 'Country X',
    code: 'XX', // two-letter ISO 3166-1 code
    age: 18 // legal drinking age
  },{
    name: 'Country Y',
    code: 'YY',
    age: 21
  }
];

Callback(err)

Pass a callback function as the second parameter. This will be called after the form submit event. The parameter err will return null if age verification succeeds, otherwise it will be an Error type. This is where you would typically write your action based on the response, e.g. redirect to a new URL, or hide the age gate view.