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copied!<p>Thanks guys, initial problem was as you suggested with me forgetting to wait for the dom to load before executing the script. Second problem was some small bracket and syntax errors in the script.</p> <p>Final code is below</p> <p>HTML / Jquery</p> <pre><code><script src="//ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js"></script> <script type="text/javascript"> $(function () { $("#weight_tracker_form").submit(function() { $.ajax({ type: "POST", url: "weight_tracker_process.php", data: { weight: $("#weight").val() }, success: function(){ alert("success"); }, error: function(){ alert("error"); } }); return false; }); }); </script> <h2>Weight Tracker</h2> <form id="weight_tracker_form" method="post"> Date: <input autofocus id="date" name="date" type="date"/> Weight: <input id="weight" name="weight" type="text"/> Kg <input type="submit" value="Submit Weight"> </form> <a href="logout.php">Log Out</a> </code></pre> <p>PHP</p> <pre><code><?php // configuration require("includes/config.php"); // if form was submitted if ($_SERVER["REQUEST_METHOD"] == "POST") { if ($_POST["weight"] == NULL) { echo "Error"; } $weight = mysql_real_escape_string($_POST["weight"]); if (query("INSERT INTO weight (user_id, weight_measurement) VALUES(?, ?)", $_SESSION["id"], $weight) == false){ echo "Update Error"; } else { echo "Success"; } } else { // else render form printf("error"); } ?> </code></pre>

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