Parsing values in JSON - php

Question

I am trying to pass some values to my PHP page and return JSON but for some reason I am getting the error "Unknown error parsererror". Below is my code. Note that if I alert the params I get the correct value.
function displaybookmarks()
{
var bookmarks = new String();
for(var i=0;i<window.localStorage.length;i++)
{
var keyName = window.localStorage.key(i);
var value = window.localStorage.getItem(keyName);
bookmarks = bookmarks+" "+value;
}
getbookmarks(bookmarks);
}
function getbookmarks(bookmarks){
//var surl = "http://www.webapp-testing.com/includes/getbookmarks.php";
var surl = "http://localhost/Outlish Online/includes/getbookmarks.php";
var id = 1;
$.ajax({
type: "GET",
url: surl,
data: "&Bookmarks="+bookmarks,
dataType: "jsonp",
cache : false,
jsonp : "onJSONPLoad",
jsonpCallback: "getbookmarkscallback",
crossDomain: "true",
success: function(response) {
alert("Success");
},
error: function (xhr, status) {
alert('Unknown error ' + status);
}
});
}
function getbookmarkscallback(rtndata)
{
$('#pagetitle').html("Favourites");
var data = "<ul class='table-view table-action'>";
for(j=0;j<window.localStorage.length;j++)
{
data = data + "<li>" + rtndata[j].title + "</li>";
}
data = data + "</ul>";
$('#listarticles').html(data);
}
Below is my PHP page:
<?php
$id = $_REQUEST['Bookmarks'];
$articles = explode(" ", $id);
$link = mysql_connect("localhost","root","") or die('Could not connect to mysql server' . mysql_error());
mysql_select_db('joomla15',$link) or die('Cannot select the DB');
/* grab the posts from the db */
$query = "SELECT * FROM jos_content where id='$articles[$i]'";
$result = mysql_query($query,$link) or die('Errant query: '.$query);
/* create one master array of the records */
$posts = array();
for($i = 0; $i < count($articles); $i++)
{
if(mysql_num_rows($result)) {
while($post = mysql_fetch_assoc($result)) {
$posts[] = $post;
}
}
}
header('Content-type: application/json');
echo $_GET['onJSONPLoad']. '('. json_encode($posts) . ')';
#mysql_close($link);
?>
Any idea why I am getting this error?

Answer 1

This is not json
"&Bookmarks="+bookmarks,

Answer 2

You're not sending JSON to the server in your $.ajax(). You need to change your code to this:
$.ajax({
...
data: {
Bookmarks: bookmarks
},
...
});
Only then will $_REQUEST['Bookmarks'] have your id.
As a sidenote, you should not use alert() in your jQuery for debugging. Instead, use console.log(), which can take multiple, comma-separated values. Modern browsers like Chrome have a console that makes debugging far simpler.