Controller
chat.php
<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
class Chat extends CI_Controller {
/* The default function that gets called when visiting the page */
public function index() {
$this->load->view('chat-view');
}
public function get_chats() {
/* Connect to the mySQL database - config values can be found at:
/application/config/database.php */
$dbconnect = $this->load->database();
/* Load the database model:
/application/models/simple_model.php */
$this->load->model('Chat_model');
/* Create a table if it doesn't exist already */
$this->Chat_model->create_table();
echo json_encode($this->Chat_model->get_chat_after($_REQUEST["time"]));
}
public function insert_chat() {
/* Connect to the mySQL database - config values can be found at:
/application/config/database.php */
$dbconnect = $this->load->database();
/* Load the database model:
/application/models/simple_model.php */
$this->load->model('Chat_model');
/* Create a table if it doesn't exist already */
$this->Chat_model->create_table();
$this->Chat_model->insert_message($_REQUEST["message"]);
}
public function time() {
echo "[{\"time\":" + time() + "}]";
}
}?>
Models chat_model.php
class Chat_model extends CI_Model {
function __construct()
{
/* Call the Model constructor */
parent::__construct();
}
function get_last_item()
{
$this->db->order_by('id', 'DESC');
$query = $this->db->get('Chats', 1);
return $query->result();
}
function insert_message($message)
{
$this->message = $message;
$this-> time = time();
$this->db->insert('Chats', $this);
}
function get_chat_after($time)
{
$this->db->where('time >', $time)->order_by('time', 'DESC')->limit(10);
$query = $this->db->get('Chats');
$results = array();
foreach ($query->result() as $row)
{
$results[] = array($row->message,$row->time);
}
return array_reverse($results);
}
function create_table()
{
/* Load db_forge - used to create databases and tables */
$this->load->dbforge();
/* Specify the table schema */
$fields = array(
'id' => array(
'type' => 'INT',
'constraint' => 5,
'unsigned' => TRUE,
'auto_increment' => TRUE
),
'message' => array(
'type' => 'TEXT'
),
'time' => array(
'type' => 'INT'
)
);
/* Add the field before creating the table */
$this->dbforge->add_field($fields);
/* Specify the primary key to the 'id' field */
$this->dbforge->add_key('id', TRUE);
/* Create the table (if it doesn't already exist) */
$this->dbforge->create_table('Chats', TRUE);
}
}
Views chat-view.php
<html>
<head>
<title> Chat Exmaples! </title>
<script src="//ajax.googleapis.com/ajax/libs/jquery/2.0.0/jquery.min.js"></script>
<script>
var time = 0;
var updateTime = function (cb) {
$.getJSON("index.php/chat/time", function (data) {
cb(~~data);
});
};
var sendChat = function (message, cb) {
$.getJSON("index.php/chat/insert_chat?message=" + message, function (data){
cb();
});
}
var addDataToReceived = function (arrayOfData) {
arrayOfData.forEach(function (data) {
$("#received").val($("#received").val() + "\n" + data[0]);
});
}
var getNewChats = function () {
$.getJSON("index.php/chat/get_chats?time=" + time, function (data){
addDataToReceived(data);
// reset scroll height
setTimeout(function(){
$('#received').scrollTop($('#received')[0].scrollHeight);
}, 0);
time = data[data.length-1][1];
});
}
// using JQUERY's ready method to know when all dom elements are rendered
$( document ).ready ( function () {
// set an on click on the button
$("form").submit(function (evt) {
evt.preventDefault();
var data = $("#text").val();
$("#text").val('');
// get the time if clicked via a ajax get queury
sendChat(data, function (){
alert("dane");
});
});
setInterval(function (){
getNewChats(0);
},1500);
});
</script>
</head>
<body>
<h1> Chat Example on Codeigniter </h1>
<textarea id="received" rows="10" cols="50">
</textarea>
<form>
<input id="text" type="text" name="user">
<input type="submit" value="Send">
</form>
</body>
</html>
