ngp-submit.js

// <form class="small-signup js-ngp-form" action="https://api.myngp.com/v2/Forms/-22033861227691015168" method="post" target="_blank">

//     <input id="Version" name="Version" type="hidden" value="AAAAA3iOF2A=" />
//     <input id="id" name="id" type="hidden" value="-22033823117691015168" />
//     <input id="ObfuscatedMailingId" name="ObfuscatedMailingId" type="hidden" value="" />
//     <input id="TenantName" name="TenantName" type="hidden" value="lfjeld" />
//     <input id="SourceCodeIds" name="SourceCodeIds" type="hidden" value="" />
//     <input id="MarketSource" name="MarketSource" type="hidden" value="" />
//     <input id="formType" name="formType" type="hidden" value="SignupForm" />

//     <input type="email" placeholder="Email" class="email input-text" name='EmailAddress'>
//     <div class="clearFix">
//         <input type="text" placeholder="Zip code" class="zip input-text" name='PostalCode'>
//         <input type="submit" value="Submit" class="submit">
//     </div>
// </form>


(function($) {
    'use strict';

    // grab form id from URL (https://act.myngp.com/Forms/-2203386117123015168)
    // e.g. "-2203386112341015168"

    var NGPformId = "-220338611769235168",
        $NGPform = $('.js-ngp-form'),
        share = function(message) {
            if (typeof console == "object") {
                console.log(message);
            }
        };

    $NGPform.on('submit', function(e) {
        var $this = $(this);
        e.preventDefault();

        $.post("https://api.myngp.com/v2/Forms/" + NGPformId, $this.serialize())
            .done(function(data) {
                if (!data.errors.length) {
                    $this.html('<p class="ngp-success">Thanks for signing up!</p>');
                } else {
                    var errorMessage = "Whoops! There were a few errors submitting the form. ";
                        errors = data.errors,

                    $.each(errors, function(index, value) {
                        errorMessage += "\n -";
                        errorMessage += value.text;
                    });

                    alert(errorMessage);

                }
                share('NGP form was submitted successfully.');
            })
            .fail(function() {
                alert('There was an error submitting this form!');
            })
            .always(function() {
                share('NGP form was submitted.');
            });

    });


}(jQuery));