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POCheck if user exists
 

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    <blockquote> <p><strong>Possible Duplicate:</strong><br> <a href="https://stackoverflow.com/questions/14024815/phonegap-load-values-from-database-based-on-a-user-id">Phonegap - Load Values from Database based on a user ID</a> </p> </blockquote> <p>I am creating a Phonegap application that requires user registration. I am doing this through a PHP Script acting as a web service to a MySQL database and using the AJAX POST/Get method.</p> <p>For some reason LogCat is always giving me <code>"There was an error"</code> (falls in the error function of the post) . </p> <p><strong>UPDATED:</strong> From the logs of MySQL I am getting this error:<br> PHP Fatal error: Call to a member function <code>bindValue()</code> on a non-object <br> It points to this line: <code>$username = $_POST['username']</code>;</p> <p>Here is a snippet of my JS code:</p> <pre><code>var u = $("#username").val(); var p = $("#password").val(); var userRegData = $('#registration').serialize(); $.ajax({ type: 'POST', data: userRegData, dataType: 'JSONp', url: 'http://www.somedomain.com/php/userregistration.php', success: function(data){ if(response==1){ // User can be saved } else { // User exsts already } }, error: function(e){ console.log('There was an error'); $.mobile.loading ('hide'); } }); return false; </code></pre> <p>And here is a snippet of my PHP code. I am using PDO.</p> <pre><code>$db = new PDO('mysql:host=' . $config['db']['host'] . ';dbname=' . $config['db']['dbname'], $config['db']['username'], $config['db']['password']); $db-&gt;setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION); $username = $_POST['username']; $password = $_POST['password']; $query-&gt;bindValue(':username', $username, PDO::PARAM_STR); $query-&gt;bindValue(':password', $password, PDO::PARAM_STR); try { $db-&gt;beginTransaction(); $db-&gt;query("SELECT `user`.`Username` FROM `user` WHERE `user`.`Username` = :username LIMIT 1"); try { if ( $query-&gt;rowCount() &gt; 0 ) { $response=1; echo $response; } else { $response=0; $db-&gt;query("INSERT INTO `user` (`user`.`Username`, `user`.`Password`) VALUES :username, :password"); echo $response; $db-&gt;commit(); } } catch (PDOException $e) { die ($e-&gt;getMessage()); } } catch (PDOException $e) { $db-&gt;rollBack(); die ($e-&gt;getMessage()); } </code></pre>
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    1. COYou should check your browser's XHR (Ajax) console what the back-end returns. The error must be in the back-end and not in the front-end. The other way of debugging this is hard-coding the POST values in the back-end and see what the error is.
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    2. COError is only thrown if your request fails, (404, 403, 500 errors). I would check to make sure your page actually returns a result.
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    3. COMake sure you're using JSONP
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      1. USjacktheripper
 

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