通过Mailchimp的电子邮件提交返回错误,Javascript和php

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我希望这是一个简单的问题.我正在使用Mailchimp API从我的网站提交一个简单的电子邮件注册表单.我现在正在尝试学习JavaScript,因此我尝试在没有jQuery的情况下进行httprequest和回调.基本上,我正在尝试将在线找到的jQuery示例转换为Vanilla Javascript.但是我的JavaScript出现了一些我不理解的问题(几件事？).

编辑：提交表单后,我被带到email-validate.php页面,并显示MailChimp返回的以下错误对象.

{"type":"http://developer.mailchimp.com/documentation/mailchimp/guides/error-glossary/","title":"Invalid Resource","status":400,"detail":"The resource submitted could not be validated. For field-specific details, see the 'errors' array.","instance":"","errors":[{"field":"","message":"Required fields were not provided: email_address"},{"field":"email_address","message":"Schema describes string, NULL found instead"}]}

jQuery的

Found here(实际上抛出ajax(…).成功不是控制台中的函数错误,但仍提交表单FWIW)

$('document').ready(function(){
  $('.mc-form').submit(function(e){

    //prevent the form from submitting via the browser redirect
    e.preventDefault();

    //grab attributes and values out of the form
    var data = {email: $('#mc-email').val()};
    var endpoint = $(this).attr('action');

    //make the ajax request
    $.ajax({
      method: 'POST',
      dataType: "json",
      url: endpoint,
      data: data
    }).success(function(data){
      if(data.id){
        //successful adds will have an id attribute on the object
        alert('thanks for signing up');
      } else if (data.title == 'Member Exists') {
        //MC wil send back an error object with "Member Exists" as the title
        alert('thanks, but you are alredy signed up');
      } else {
        //something went wrong with the API call
        alert('oh no, there has been a problem');
      }
    }).error(function(){
      //the AJAX function returned a non-200, probably a server problem
      alert('oh no, there has been a problem');
    });
  });
});

我的Javascript(无效)

document.addEventListener("DOMContentLoaded", function() {
    document.getElementById("mc-form", function submit(e){
        e.preventDefault();

        var data = {"email": document.getElementById("mc-email").value};
        var endpoint = document.getElementById("mc-form").getAttribute('action');

        function formSubmit(callback){
            var request = new XMLHttpRequest();

                request.onreadystatechange = function() {
                    if (request.readyState === 4) {
                      if (request.status === 200) {
                        //Parse returned string into an object, then pass the object to the callback function.
                        var response = JSON.parse(request.responseText);
                        callback(response);
                      } else {
                   console.log('JSON request error');
                        }
                    }
                }
            request.open("POST", endpoint , true);
            request.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
            request.send(data);
        }
        function formResponse(response){
            if(response.id){
            //successful adds will have an id attribute on the object
            alert('Thank you for signing up for Launch Alerts!');
          } else if (response.title == 'Member Exists') {
            //MC wil send back an error object with "Member Exists" as the title
            alert('You are already signed up for Launch Alerts!');
          } else {
            //something went wrong with the API call
            alert('Something went wrong. Please resubmit the form!');
          }
        }
        formSubmit(formResponse);
    })
});

我的HTML

<form class="mc-form" method="POST" action="./email-validate.php">
    <h2 class="launch-alerts">Never miss a launch with Launch Alerts</h2>
    <label for="mc-email">Email Address:</label>
    <input type="email" id="mc-email" name="mc-email" autofocus="true" required/>
    <input type="text" value="pending" id="status" name="status" hidden/>
    <input type="submit" value="Submit">
</form>

如上链接所示,它使用php文件来验证并提交表单.使用jQuery脚本而不是我的javascript时,html和php可以提交表单,这意味着我的脚本有问题,但是我对javascript太陌生,无法完全理解我要做什么.我做错了.

谢谢！

编辑2：

PHP代码(直接从here复制)

<?php
//fill in these values for with your own information
$api_key = 'xxxxxxxxxxxxxxxxxxxxxxxx';
$datacenter = 'xxxxx';
$list_id = 'xxxxxxxxx';
$email = $_POST['email'];
$status = 'pending';
if(!empty($_POST['status'])){
    $status = $_POST['status'];
}
$url = 'https://'.$datacenter.'.api.mailchimp.com/3.0/lists/'.$list_id.'/members/';
$username = 'apikey';
$password = $api_key;
$data = array("email_address" => $email,"status" => $status);
$data_string = json_encode($data);
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL,$url);
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS, $data_string);
curl_setopt($ch, CURLOPT_RETURNTRANSFER,1);
curl_setopt($ch, CURLOPT_HTTPAUTH, CURLAUTH_BASIC);
curl_setopt($ch, CURLOPT_USERPWD, "$username:$api_key");
curl_setopt($ch, CURLOPT_HTTPHEADER, array(
    'Content-Type: application/json',
    'Content-Length: ' . strlen($data_string))
);
$result=curl_exec ($ch);
curl_close ($ch);
echo $result;
?>

解决方法:

request.send()的数据参数必须是URL编码的字符串,您正在传递一个对象. jQuery会自动为您执行此转换；当你自己做的时候,你也必须自己做.

var data = "email=" + encodeURIComponent(document.getElementById("mc-email").value);

您也没有将提交功能正确添加到表单的Submit事件中.它应该是：

document.getElementById("mc-form").addEventListener("submit", function submit(e){

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