A PDO Example Using SQLite and simple AJAX
From Hashphp.org
<?php
// Connect to the DB.
// In this case we're using sqlite, with a file path of /temp/barcodes.sqlite
$db = new PDO('sqlite:/temp/barcodes.sqlite');
// Create the table if it doesn't exist (you wouldn't have this on mysql or such)
$db->query('
CREATE TABLE IF NOT EXISTS Barcodes
(
id INTEGER PRIMARY KEY AUTOINCREMENT,
Barcode VARCHAR(255)
)
');
// If a barcode has been submitted
if(!empty($_POST['barcode']))
{
// Create a statement to insert the barcode into the database
$stmt = $db->prepare('INSERT INTO Barcodes (Barcode) VALUES (:barcode)');
// Execute the statement using the submitted barcode
$stmt->execute(array($_POST['barcode']));
// Output the saved barcode to show in response
echo htmlentities($_POST['barcode']);
// End the script here
die();
}
?><!doctype html>
<html>
<head>
<title>Barcode Scanner</title>
<script src="http://code.jquery.com/jquery-1.4.2.min.js"></script>
<script type="text/javascript">
$(function() {
// Fetch a handle to the Barcode text field and the Form that contains it
var barcode = $('#barcode');
var barcodeForm = $('#barcodeForm');
// Create a new function for the KeyDown event on the Barcode field
barcode.keydown(function(e) {
// If the keycode of the key pressed is 13 (enter)
if(e.which == 13) {
// Make a new AJAX form post
$.post(
barcodeForm.action, // Use the action from HTML form
barcodeForm.serialize(), // Use the data from the HTML form
function(data){ // When the form submission is complete, run this function
// Add the new barcode entry to the list of barcodes
$('ul').prepend('<li>' + data + '</li>');
// Empty out the Barcode textbox to be ready for the next submission
barcode.val('');
});
// Return false to prevent the browser from processing the enter keypress
return false;
}
});
});
</script>
</head>
<body>
<form method="post" action="#" id="barcodeForm">
<label for="barcode">Barcode:</label>
<input type="text" name="barcode" id="barcode"/>
<input type="submit" value="Send"/>
</form>
<ul>
<?php
// Get ALL barcodes from the database, ordered from last to first
$stmt = $db->query('SELECT Barcode FROM Barcodes ORDER BY ID DESC');
// Fetch all the returned rows into an array
$rows = $stmt->fetchAll();
// Loop over the array of rows
foreach($rows as $row) {
// Output each barcode as a list item
echo "<li>{$row['Barcode']}</li>";
}
?>
</ul>
</body>
</html>
