在没有jQuery AJAX的情况下在React中提交表单

我正试图在我使用React构建的静态站点中使用Formspree提交表单。我已经接近了，但现在完全迷路了。

I'm trying to submit my form using formspree in a static site I'm building with React. I've gotten close, but now completely lost.

我正在尝试使用ES6 Promise函数，但不知道如何完成。

I'm trying to use ES6 Promise function but don't know how to complete it.

这里是我当前的代码：

import React from 'react';
import { Link } from 'react-router';


import { prefixLink } from 'gatsby-helpers';
import { config } from 'config';

import Headroom from 'react-headroom';

import Nav from './nav.js';

import '../css/main.scss';

import Modal from 'boron/DropModal';

import {Input, Label,Textarea, Button} from 're-bulma';

const modalStyle = {
  minHeight: '500px',
  backgroundColor: '#303841'
};

const backdropStyle = {
  backgroundColor: '#F6C90E'
};

const contentStyle = {
  backgroundColor: '#303841',
  padding: '3rem'
};

const gotcha = {
  display: 'none'
};

const email = 'https://formspree.io/dillonraphael@gmail.com';




export default class RootTemplate extends React.Component {
  static propTypes = {
    location: React.PropTypes.object.isRequired,
    children: React.PropTypes.object.isRequired,
  }

  static contextTypes = {
    router: React.PropTypes.object.isRequired,
  }

  constructor() {
    super();
    this.showModal = this.showModal.bind(this);
  }

  showModal () {
    this.refs.modal.show();
  }

  formSubmit(e) {
    e.preventDefault();
    let data = {
      name: this.refs.name.value,
      email: this.refs.email.value,
      message: this.refs.message.value
    }
    return new Promise((resolve, reject) => {
      const req = new XMLHttpRequest();
      req.open('POST', email);
    });
    console.log(data);
  }

  render() {
    return (
      <div>
        <Headroom>
          <Nav showModal={this.showModal}/>
        </Headroom>
        <Modal ref="modal" modalStyle={modalStyle} contentStyle={contentStyle} backdropStyle={backdropStyle}>
          <form ref='contact_form' onSubmit={::this.formSubmit}>
            <Label>Name:</Label>
            <Input ref="name" />
            <Label>Email:</Label>
            <Input ref="email" type="email"/>
            <Label>Message:</Label>
            <Textarea ref="message" />
            <Input type="text" name="_gotcha" style={gotcha}/>
            <Button buttonStyle="isOutlined" color="isWarning">Submit</Button>
          </form>
        </Modal>
        {this.props.children}
      </div>
    );
  }
}

我目前也收到此错误：

Object {name: undefined, email: undefined, message: undefined}

任何帮助将不胜感激。

Any help would be greatly appreciated. Really trying to learn.