ethics-canvas/canvas/php/get-typing.php

<?php
    require_once("../../php/db_utils.php");
    
    try {
        // Connect to the database
        $database = db_connect();
        
        // Incoming data
        $canvasId = $_POST["canvas_id"];
        $username = $_POST["username"];
        
        // Declare query
        $query = 'SELECT user.name, collaborators.typing_id
                  FROM collaborators
                  INNER JOIN user ON collaborators.collaborator = user.username
                  AND collaborators.canvas_id = "' . $canvasId . '"
                  AND NOT collaborators.typing_id = ""
                  AND NOT collaborators.collaborator = "' . $username . '";';
                    
        // Run query
        $recordSet = db_query_return($database, $query);
        
        // Get typing ID
        $typing = Array();
        
        // Declare index
        $index = 0;
        
        // For every collaborator that is currently typing
        while($record = $recordSet->fetch_assoc()) {
            // Declare the collaborator
            $typing[$index]["name"] = $record["name"];
            // Declare the idea that is being typed in
            $typing[$index]["typingId"] = $record["typing_id"];
            
            // Increment index
            $index++;
        }
        
        mysqli_free_result($recordSet);
        
        echo(json_encode($typing));
        
        // Close the connection to the database
        db_close($database);
    }
    catch(Exception $e) {
        $errorMsg = $e->getMessage();
        print_r($errorMsg);
    }
?>