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copied!<p>It should be like</p> <p>Your <strong>HTML Page</strong></p> <pre><code><html> <body> <script> function checkIfUserCanBeSaved(){ var userRegData = $('#registration').serialize(); $.ajax({ type: 'POST', data: userRegData, url: 'http://www.somedomain.com/php/userregistration.php', success: function(data){ if(response==1){ alert('user found'); } else { alert('user saved') } }, error: function(e){ console.log('There was an error'); $.mobile.loading ('hide'); } }); return false; } </script> <form id="registration"> <input type="text" name="username"> <input type="text" name="password"> <input type="button" onclick="checkIfUserCanBeSaved()" value="submit"> </form> </body> </html> </code></pre> <p>Your <strong>PHP Page</strong></p> <pre><code>$db = new PDO('mysql:host=' . $config['db']['host'] . ';dbname=' . $config['db']['dbname'], $config['db']['username'], $config['db']['password']); $db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION); $username = $_POST['username']; $password = $_POST['password']; try { $db->beginTransaction(); try { $query = $db->prepare("SELECT user.Username FROM user WHERE user.Username = :username LIMIT 1"); $query->bindValue(':username', $username, PDO::PARAM_STR); $query->execute(); if ( $query->rowCount() > 0 ) { $response=1; echo $response; } else { $response=0; $query = $db->prepare("INSERT INTO user ( username, password ) VALUES ( :username, :password )" ); $query->bindValue(':username', $username, PDO::PARAM_STR); $query->bindValue(':password', $password, PDO::PARAM_STR); $query->execute(); echo $response; $db->commit(); } } catch (PDOException $e) { die ($e->getMessage()); } } catch (PDOException $e) { $db->rollBack(); die ($e->getMessage()); } </code></pre>

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