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Intervals, Database and Registry

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Durisvk edited this page Dec 18, 2016 · 1 revision

Intervals, Database and Registry:

Let's create something more advanced. We will create the chat application with the login information.

First let's create our login view.

app/view/chat/chatLogin.php:

<!DOCTYPE html>
<html>
<head>
    <title>EOSS Introduction</title>
</head>
<body>
<div id="error" style="color: red"></div>
<input type="text" id="username" /><br>
<input type="password" id="password" /><br>
<input type="button" id="next" value="Next" />
</body>
</html>

Inside the #error we will print the Invalid credentials when the user enters wrong username or password.

Now let's create indexEOSS.

app/controller/indexEOSS.php:

<?php

use \EOSS\EOSS;

class indexEOSS extends EOSS
{
    public function load()
    {
        $this->csi->setFile("chat/chatLogin.php");
    }

    public function bind()
    {
        $this->csi->next->onclick[] = "next";
    }


    public function next($sender) {
        $database = new \Database\PDOWrapper('localhost', 'username', 'password', 'testdatabase');

        if($row = $database->prepareExecuteAndFetch("SELECT * FROM users WHERE username = ? AND password = ?", $this->csi->username->value, $this->csi->password->value)) {
            $this->csi->error->html = "";
            \EOSS\Registry::getInstance()->username = $this->csi->username->value;
            $this->redirect("chatEOSS");
        } else {
            $this->csi->error->html = "Invalid credentials.";
        }
    }


}

We will pass the username into the chatEOSS through the Registry which is the Singleton pattern and is stored inside Sessions.

Let's create a chat view.

app/view/chat/chat.php:

<!DOCTYPE html>
<html>
<head>
    <title>EOSS Introduction</title>
</head>
<body>
<div id="chat"><?= isset($chat) ? $chat : "" ?></div>
<input type="text" id="message">
<input type="button" id="send" value="Send">
<input type="button" id="back" value="Back" />
</body>
</html>

Now we need to create a ChatModel which will look like this:

app/models/ChatModel.php:

<?php

class ChatModel
{

    /**
     * @var \Database\PDOWrapper
     */
    private $database;

    public function __construct() {
        $this->database = new \Database\PDOWrapper('localhost', 'username', 'password', 'testdatabase');
    }

    public function getChatMessagesFormatted() {
        $chat = "";
        if($row = $this->database->queryAndFetchAll("SELECT * FROM chat LIMIT 10")) {
            foreach($row as $r) {
                $chat .= "<b>" . $r["username"] . "</b>: " . $r["message"] . "<br>";
            }
        }
        return $chat;
    }

    public function sendMessage($username, $message) {
        $this->database->prepareAndExecute("INSERT INTO chat(username, message) VALUES(?, ?)", $username, $message);
    }

}

Now let's create

Now we can finally create our chatEOSS.

app/controller/chatEOSS.php:

<?php
use \EOSS\EOSS;

class chatEOSS extends EOSS
{

    /**
     * @var ChatModel|null
     */
    private $chatModel = NULL;

    public function load()
    {
        $this->chatModel = new ChatModel();

        $this->csi->setFile("chat/chat.php");

        $this->csi->params->chat = $this->chatModel->getChatMessagesFormatted();
    }


    public function bind()
    {
        $this->csi->send->onclick[] = "sendMsg";
        $this->csi->back->onclick[] = "back";
        $this->csi->intervals["reloadPosts"] = 500;
    }

    public function reloadPosts() {
        $this->csi->chat->html = $this->chatModel->getChatMessagesFormatted();
    }

    public function sendMsg($sender) {
        $this->chatModel->sendMessage(\EOSS\Registry::getInstance()->username, $this->csi->message->value);
        $this->csi->message->value = "";
    }

    public function back($sender) {
        $this->redirect("chatLoginEOSS");
    }



}

We've set the interval to call reloadPosts every 500 ms. The syntax is $this->csi->intervals["functionYouWantToCall"] = 500.

And now we're done...

Welcome to EOSS, we are glad to see you here.

We are looking for contributors, come and join us, write me an email on [email protected] or post something on a http://eoss.wz.sk .

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