crossDomain.js

//= require _jquery-1.9.1.min

window.crossDomainPost = function crossDomainPost(success) {
    var uniqueString = "CHANGE_THIS_TO_SOME_UNIQUE_STRING",
        $iframe      = $('<iframe name=' + uniqueString + '>'),
        $form        = $('<form>'),
        fields       = [
            'email',
            'first_name',
            'last_name',
            'password'
        ];

    $('body').append($iframe);
    $('iframe').load(success);

    // construct a form with hidden inputs, targeting the iframe
    $form.attr('target', uniqueString);
    $form.attr('action', "http://dev.unc-mba-prtl-bnadler.2u.com:8080/portal/users");
    $form.attr('method', "POST");

    //copy parameters from visible form
    $.each(fields, function (index, field) {
        var $input = $("<input>");
        $input.attr('type', "hidden");
        $input.attr('name', field);
        $input.attr('value', $("input[name=" + field + "]").val());
        $form.append($input);
    });

    $('body').append($form);
    $form.submit();
}

$(document).ready(function () {
    $("#signup").submit(function () {
        crossDomainPost(function () {
            window.location = "http://dev.unc-mba-prtl-bnadler.2u.com:8080/#/apply"
        });
        return false;
    });
});