Mailcheck.js - Reduce user-misspelled email addresses

Mailcheck.js is a Javascript library and jQuery plugin that suggests a right domain when your users misspell it in an email address.

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Source: github.com

1. INCLUDE JS FILES

<script src="jquery.min.js"></script>
<script src="mailcheck.min.js"></script>

2. HTML

<input id="email" name="email" type="email" />

3. JAVASCRIPT

var domains = ['hotmail.com', 'gmail.com', 'aol.com'];
var topLevelDomains = ["com", "net", "org"];

var superStringDistance = function(string1, string2) {
  // a string distance algorithm of your choosing
}

$('#email').on('blur', function() {
  $(this).mailcheck({
    domains: domains,                       // optional
    topLevelDomains: topLevelDomains,       // optional
    distanceFunction: superStringDistance,  // optional
    suggested: function(element, suggestion) {
      // callback code
    },
    empty: function(element) {
      // callback code
    }
  });
});

Mailcheck takes in two callbacks, suggested and empty. We recommend you supply both.

suggested is called when there's a suggestion. Mailcheck passes in the target element and the suggestion. The suggestion is an object with the following members:

{
  address: 'test',          // the address; part before the @ sign
  domain: 'hotmail.com',    // the suggested domain
  topLevelDomain: 'com',    // the suggested top level domain
  full: '[email protected]'  // the full suggested email
}

Mailcheck does not want to get in the way of how you can show suggestions. Use the suggestion object to display suggestions in your preferred manner.

empty is called when there's no suggestion. Mailcheck just passes in the target element. It is a good idea to use this callback to clear an existing suggestion.