mailgun_validator.js for email validation

$.fn.mailgun_validator = function(options) {

    return this.each(function() {
        $(this).focusout(function() {

            run_validator($(this).val(), options);
        });

    });
};

function run_validator(address_text, options) {
    // don't run validator without input

    if (!address_text) {
        return;

    }
    // length check

    if (address_text.length > 512) {
        error_message = 'Stream exceeds maxiumum allowable length of 512.';

        if (options && options.error) {
           options.error(error_message);

        }
        else {

            console.log(error_message);
        }

        return;
    }


    // validator is in progress

    if (options && options.in_progress) {
        options.in_progress();

    }
    // require api key

    if (options && options.api_key == undefined) {
        console.log('Please pass in api_key to mailgun_validator.')

    }
    var success = false;


    // make ajax call to get validation results

    $.ajax({
        type: "GET",

        url: 'https://api.mailgun.net/v2/address/validate?callback=?',
        data: { address: address_text, api_key: options.api_key },

        dataType: "jsonp",
        crossDomain: true,

        success: function(data, status_text) {
           success = true;

            if (options && options.success) {
                options.success(data);

            }
        },

        error: function(request, status_text, error) {
            success = true;

            error_message = 'Error occurred, unable to validate address.';
            if (options && options.error) {

                options.error(error_message);
            }

            else {
               console.log(error_message);

            }
        }

    });
    // timeout incase of some kind of internal server error

    setTimeout(function() {
        error_message = 'Error occurred, unable to validate address.';

        if (!success) {
            if (options && options.error) {

                options.error(error_message);
            }

            else {
                console.log(error_message);

            }
        }

    }, 30000);
}