使用Codeigniter Email发送新聊天消息的提醒

Question

我使用Alasdair Boyd教程（here）在Codeigniter中创建聊天服务。每次用户输入新消息时，都会将其提交到数据库，并且消息会在屏幕上快速显示，并显示所有其他消息。

在我尝试引入codeigniter电子邮件功能之前，一切正常。当运行发送功能（运行codeigniter电子邮件）时，会发送一封电子邮件，但快速更新屏幕上消息的功能会消失。

因此，在我看来，如果我使用codeigniter电子邮件代码，它会停止在chat.js中运行以下代码行

$(document).ready(function() {
        setInterval(function (){get_chat_messages();},2500);

（...）

但是，我不明白为什么。下面我提交所有代码。提前感谢您的帮助。

我的观点：

<div id = "chat_viewport"></div>

<div id="chat_input">
<input id = "chat_message" name = "chat_message" type = "text" value = "" tabindex = "1"/>
    <?php echo anchor('email','Say it', array('title'=> 'Send this chat message', 'id'=>'submit_message'));?>
    <div class = "clearer"></div>
</div>

我的控制器

<?php
class Email extends CI_Controller{
    public function index(){

        if(!$this->session->userdata('logged_in')){
            redirect('frontpage');
        }
        $id = $this->session->userdata('user_id');
        $data['chat_id'] = "1";
        $this->session->set_userdata('last_chat_message_id_'.$data['chat_id'],0);

        $data['user_id'] = $this->session->userdata('user_id');
        $data['first_name'] = $this->User_model->get_name($id );
        $data['main_content'] = 'email';
        $this->load->view('layouts/main', $data);

    }

    function ajax_add_chat_message()
    {

        $chat_id = $this->input->post('chat_id');
        $user_id = $this->input->post('user_id');
        $chat_message_content = $this->input->post('chat_message_content',TRUE);
        $this->send($chat_message_content);
        $this->Email_model->add_chat_messages($chat_id, $user_id, $chat_message_content);

        //grab and return all messages
        echo $this->_get_chat_messages($chat_id);
    }

    function ajax_get_chat_messages(){
        $chat_id = $this->input->post('chat_id');
        echo $this->_get_chat_messages($chat_id);
    }
    function _get_chat_messages ($chat_id){
        $last_chat_message_id = (int)$this->session->userdata('last_chat_message_id_'.$chat_id);
        $chat_messages = $this->Email_model->get_chat_messages ($chat_id,$last_chat_message_id);

        if ($chat_messages->num_rows()>0){

            //store the last chat message id
            $last_chat_message_id = $chat_messages ->row($chat_messages->num_rows() - 1)->chat_message_id;
            $this->session->set_userdata('last_chat_message_id_'.$chat_id,$last_chat_message_id);
            //We have some chat
            $chat_messages_html = '<ul>';

            foreach($chat_messages->result() as $chat_message)
            {
                $li_class = ($this->session->userdata('user_id')==$chat_message->user_id)? 'class = "by_current_user"' : '';
                $chat_messages_html .= '<li ' . $li_class .'>'.'<span class = "chat_message_header">'. $chat_message->chat_message_timestamp .' by '. $chat_message->name . '</span><p class = "message_content">'. $chat_message->chat_message_content.'</p></li>';
            }
            $chat_messages_html .= '</ul>';

            $result = array('status' => 'ok', 'content' => $chat_messages_html);

            return json_encode($result);
        }else{
            $result = array('status' => 'ok', 'content' => '');

            return json_encode($result);
            exit();
        }
    }   

    function send($message = null){

                $config = array(
                    'protocol' => 'smtp', 
                    'smtp_host'=> 'ssl://smtp.googlemail.com',
                    'smtp_port' => 465,
                    'smtp_user' =>'patient@gmail.com',
                    'smtp_pass' => '12345'
                    );

                    $this->load->library('email',$config);
                    $this->email->set_newline("\r\n");

                    $this->email->from  ('patient@gmail.com','Mike');
                    $this->email->to ('hospital@gmail.com');
                    $this->email->subject('This is an email test');
                    $this->email->message($message);
                    if($this->email->send())
                    {
                        echo 'Your email was sent.';
                    }
                    else
                    {
                     show_error($this->email->print_debugger());
                     }

                return false;
            }

}

我的模特

        <?php
    class Email_model extends CI_Model{

        function add_chat_messages ($chat_id, $user_id, $chat_message_content)
        {
            /* $query_str = "INSERT INTO chat_messages (chat_id, user_id, chat_message_content) VALUES(?,?,?)";
            $this->db->query($query_str, array($chat_id,$user_id, $chat_message_content)); */
            $data = array(
               'chat_id' => $chat_id,
               'user_id' => $user_id ,
               'chat_message_content' => $chat_message_content,);


    $this->db->insert('chat_messages', $data); 

        }

        function get_chat_messages ($chat_id,$last_chat_message_id=0){

            $query_str = "SELECT cm.user_id, cm.chat_message_content, cm.chat_message_id,
                            DATE_FORMAT(cm.create_date,'%D of %M %Y at %H:%i:%s') as chat_message_timestamp,u.name
                            FROM chat_messages cm
                            JOIN person u ON cm.user_id = u.id
                            WHERE cm.chat_id = ?
                            and cm.chat_message_id > ?
                            ORDER BY cm.chat_message_id ASC";


            $result = $this->db->query($query_str,array($chat_id,$last_chat_message_id));
            return $result;

        }

    }

Javascript文件Chat.js

$(document).ready(function() {
        setInterval(function (){get_chat_messages();},2500);

        $("input#chat_message").keypress(function(e){
            if(e.which==13){
                $("a#submit_message").click();
                return false;
            }
        });

        $("a#submit_message").click(function(){
            var chat_message_content = $("input#chat_message").val();       
             if(chat_message_content == ""){return false;} 

            $.post(base_url + "email/ajax_add_chat_message",{chat_message_content : chat_message_content, chat_id : chat_id, user_id : user_id}, function(data) {
                if (data.status == 'ok'){
                    var current_content = $("div#chat_viewport").html();
                    $("div#chat_viewport").html(current_content + data.content);
                }else {
                    //there eas an error
                }
            }, "json");

            $("input#chat_message").val(""); 
            return false; 
        });

         function get_chat_messages(){
            $.post(base_url + "email/ajax_get_chat_messages",{chat_id:chat_id}, function(data) {
                if (data.status == 'ok'){
                    var current_content = $("div#chat_viewport").html();
                    $("div#chat_viewport").html(current_content + data.content);
                }else {
                    //there eas an error
                }
            }, "json");
        }
    get_chat_messages();  
});