如何使用php jquery ajax上传文件和插入数据

我无法通过ajax发送到ajax的php文件上传和数据. This my code just send file upload.数据无法发送到我的PHP代码.我创建表单，并使用ajax在php上单击发送函数. I'm using codeigniter

I cannot send via ajax to php file upload and data with ajax. This my code just send file upload. data not send to my php code. I create form and the function send on click using ajax to post on php. I'm using codeigniter

这是我的表格:

<form action="<?php echo site_url('home/send_chat');?>" method="post" enctype="multipart/form-data">
  <input name="message" id="message" type="text" class="form-control input-sm" />
  <input type="file" id="file" name="file" />
  <br />
  <span class="input-group btn">
    <button type="submit" class="btn btn-info btn-sm" id="submit">Enkripsi</button>
  </span>
</form>

此javascript使用ajax在php上发送帖子:

This javascript to send post on php using ajax:

$('#submit').on('click', function(){
  var message = $('#message').val();

  var fd = new FormData(this);
  fd.append('file',$('#file')[0].files[0]);

  $.ajax({
    method:"POST",
    url:"<?php echo site_url('home/send_chat');?>",    
    data: {fd,message:message},  
    cache: false,
    contentType: false,
    processData: false,   
    success: function(data){                 
      alert(data);
    },
    error: function(xhr, status, error) {
      alert(xhr.responseText);
    }  
  });
});

我已经尝试使用$_POST['message'];和$this->input->post("message");，但两者均不起作用 此php处理代码:

I'm already try using $_POST['message']; and $this->input->post("message"); its not work both This php to proces code:

<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
class Home extends CI_Controller {
  public function send_chat()
  {
    $name    = $_FILES['file']['name'];
    $error   = $_FILES['file']['error'];
    $size    = $_FILES['file']['size'];


    // $message = $_POST['message'];
    $message = $this->input->post("message");

    $user    = $this->session->userdata('username');
    $iduser  = $this->session->userdata('userID');



    $insert="insert into chat (user,message,id_user,fileupload) VALUES ('$user','$message','$userid','$name')";
    $this->db->query($insert);
  }
}

在数据库中，我只是发送名称文件upload.user，消息和iduser而不发送.

In database i'm just send name file upload.user, message, and iduser its not send.