Fixed non static method call & Added query string support

application/Controller/SongsController.php

@@ -18,6 +18,23 @@
 
 class SongsController
 {
+
+    /** @var object Query String (Key: Value pairs)
+     * Example: /Controller/action/?artist=Singer who Sings&track=Song of Awesomeness&link=http://example.com
+     */
+    private $query_string = null;
+
+    /**
+     * Class Constructor
+     * Accepts a $query_string object as a parameter or if none
+     * defaults it to null. Then assigns the object to the private
+     * $query_string variable.
+     */
+    function __construct($query_string = null)
+    {
+      $this->query_string = $query_string;
+    }
+
     /**
      * PAGE: index
      * This method handles what happens when you move to http://yourproject/songs/index
@@ -58,6 +75,24 @@ public function addSong()
         header('location: ' . URL . 'songs/index');
     }
 
+    /**
+     * ACTION: addSongFromQueryString
+     * This method handles what happens when you move to http://yourproject/songs/addsongFromQueryString
+     * IMPORTANT: This is not a normal page, it's an ACTION. This is where the "add a song (Using Ajax with Query String)" form on songs/index
+     * directs the ajax request. This method handles all the POST data from the query string
+     * This is an example of how to handle a POST request via JavaScript using Query Strings.
+     */
+    public function addSongFromQueryString()
+    {
+        // if we have POST data to create a new song entry
+        if (!empty((array)$this->query_string)) {
+            // Instance new Model (Song)
+            $Song = new Song();
+            // do addSong() in model/model.php
+            $Song->addSong($this->query_string->artist, $this->query_string->track, $this->query_string->link);
+        }
+    }
+
     /**
      * ACTION: deleteSong
      * This method handles what happens when you move to http://yourproject/songs/deletesong

application/Core/Application.php

@@ -2,6 +2,8 @@
 /** For more info about namespaces plase @see http://php.net/manual/en/language.namespaces.importing.php */
 namespace Mini\Core;
 
+require APP . 'Core/CoreFunctions.php';
+
 class Application
 {
     /** @var null The controller */
@@ -13,6 +15,11 @@ class Application
     /** @var array URL parameters */
     private $url_params = array();
 
+    /** @var object Query String (Key: Value pairs)
+     * Example: \Controller\action\?artist=Singer&track=Song&link=http://example.com
+     */
+    private $query_string = null;
+
     /**
      * "Start" the application:
      * Analyze the URL elements and calls the according controller/method or the fallback
@@ -34,7 +41,10 @@ public function __construct()
             // if so, then load this file and create this controller
             // like \Mini\Controller\CarController
             $controller = "\\Mini\\Controller\\" . ucfirst($this->url_controller) . 'Controller';
-            $this->url_controller = new $controller();
+
+            // Construct the requested controller and pass in the $query_string variable as a parameter
+            // to the class constructor.
+            $this->url_controller = new $controller($this->query_string);
 
             // check for method: does such a method exist in the controller ?
             if (method_exists($this->url_controller, $this->url_action)) {
@@ -84,6 +94,22 @@ private function splitUrl()
             // Rebase array keys and store the URL params
             $this->url_params = array_values($url);
 
+            if (isset($_SERVER['QUERY_STRING'])) {
+                // Parse the query string to retreive an array containing
+                // the URL and query string and assign it to a variable.
+                parse_str($_SERVER['QUERY_STRING'], $data);
+
+                // Remove the URL index from the array.
+                unset($data['url']);
+
+                // If the array is empty, no query string is present.
+                // Otherwise convert the array to an object and assign
+                // it to the $query_string variable.
+                if (!empty($data)) {
+                $this->query_string = (object) $data;
+                }
+            }
+
             // for debugging. uncomment this if you have problems with the URL
             //echo 'Controller: ' . $this->url_controller . '<br>';
             //echo 'Action: ' . $this->url_action . '<br>';

application/Core/CoreFunctions.php

@@ -0,0 +1,16 @@
+<?php
+
+namespace Mini\Controller;
+
+function view($path, $data = [])
+{
+    foreach ($data as $k => $v) {
+        $$k = $v;
+    }
+    require APP . "view/{$path}";
+}
+
+
+function redirect($path) {
+    header('location: ' . URL . $path);
+}

application/Core/Model.php

@@ -17,7 +17,7 @@ class Model
     function __construct()
     {
         try {
-            self::openDatabaseConnection();
+            $this->openDatabaseConnection();
         } catch (\PDOException $e) {
             exit('Database connection could not be established.');
         }
@@ -34,6 +34,13 @@ private function openDatabaseConnection()
         // @see http://www.php.net/manual/en/pdostatement.fetch.php
         $options = array(PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_OBJ, PDO::ATTR_ERRMODE => PDO::ERRMODE_WARNING);
 
+        // setting the encoding is different when using PostgreSQL
+        if (DB_TYPE == "pgsql") {
+            $databaseEncodingenc = " options='--client_encoding=" . DB_CHARSET . "'";
+        } else {
+            $databaseEncodingenc = "; charset=" . DB_CHARSET;
+        }
+
         // generate a database connection, using the PDO connector
         // @see http://net.tutsplus.com/tutorials/php/why-you-should-be-using-phps-pdo-for-database-access/
         $this->db = new PDO(DB_TYPE . ':host=' . DB_HOST . ';dbname=' . DB_NAME . ';charset=' . DB_CHARSET, DB_USER, DB_PASS, $options);

application/view/songs/index.php

@@ -13,6 +13,16 @@
             <input type="text" name="link" value="" />
             <input type="submit" name="submit_add_song" value="Submit" />
         </form>
+        <h3>Add a song (Using Ajax with Query String)</h3>
+        <form>
+            <label>Artist</label>
+            <input type="text" name="artist" id="artist" value="" required />
+            <label>Track</label>
+            <input type="text" name="track" id="track" value="" required />
+            <label>Link</label>
+            <input type="text" name="link" id="link" value="" />
+            <button type="button" name="submit_add_song_button" id="submit_add_song_button">Submit</button>
+        </form>
     </div>
     <!-- main content output -->
     <div class="box">

public/js/application.js

@@ -36,4 +36,29 @@ $(function() {
         });
     }
 
+
+    // if #submit_add_song_button exists
+    if ($('#submit_add_song_button').length !== 0) {
+
+        $('#submit_add_song_button').on('click', () => {
+            let artist = document.getElementById('artist')
+            let track = document.getElementById('track')
+            let link = document.getElementById('link')
+
+            // send an ajax-request to this URL: current-server.com/songs/ajaxGetStats
+            // "url" is defined in views/_templates/footer.php
+            $.ajax({
+                url: `${url}/songs/addSongFromQueryString/?artist=${artist.value}&track=${track.value}&link=${link.value}`,
+                success: () => {
+                    console.log('Ajax request succeeded.')
+
+                    // Reload the page on success
+                    window.location.reload()
+                },
+                fail: () => {
+                    console.log('Some error handling.')
+                }
+            })
+        });
+    }
 });