Runs php code from JavaScript in impact engine

Question

I have created a game in using impact game engine called Staroids.

I have created a database to store the highscores.

I have done what it says on this previous answer and looked at a few other solutions, but it doesn't seem to work!

I am trying to run a php file which contains the following code:

<?php

    $connect = mysql_connect('localhost', 'root', 'password');
    mysql_select_db('staroids', $connect);

    $sql = 'INSERT INTO staroids (score) VALUES ("'.$_POST['score'].'")';
    $result = mysql_query($sql);

?>

Here is the code that I run in the JavaScript file:

$.post('scripts/register.php', {score: score}, function(){}).error(function(){
    alert('error... ohh no!');
});

It comes up with the following error in console when it reaches this code:

Uncaught ReferenceError: $ is not defined 

Answer 1

I solved it with the help from the comments above and using a lot of trial and error, here is the working code:

<script type="text/javascript" src="http://code.jquery.com/jquery-1.10.2.js"></script>
//make sure you run this otherwise the $post request wont work!

Then where in the JavaScript function where I wanted to run the code I put:

$.post('register.php', {score: this.score}, function(){}).error(function(){
    alert('error... ohh no!');
});
//this runs the php file parsing through the score variable

Here is the PHP code which I then run to add the parsed through variable to the table in the database:

<?php

    $score = $_POST['score'];
    mysql_connect("localhost", "root", "password");
    mysql_select_db("staroids");
    mysql_query("INSERT INTO scores (score) VALUES ('$score')");

?>

Answer 2

You're probably not loading jQuery into your page correctly. Make sure you have the script tag in the head that loads jQuery and troubleshoot to make sure it's actually loading jQuery at all.