Unknown issue with JSON string formatting - fullcalendar

Question

I'm passing data to my implementation of the FullCalendar via JSON.
My feed looks ok, but for some reason the calendar doesn't display any data.
Here is an example of my JSON feed:
[{
"title":"Resourse for Paths ",
"start":"2011-11-08T07:30:00Z",
"end":"2011-11-08T10:30:00Z",
"allDay":false
}]
According to the FullCalendar manual, everything looks ok, but I am getting no data at all.
Does anyone see anything that I don't?
Here is the code that generates the feed:
Private Function makejsonoftable(ByVal table As DataTable, ByVal e As makejson) As String
Dim sb As New StringBuilder()
Dim cultureName As String = "en-US"
Dim culture As CultureInfo = New CultureInfo(cultureName)
Dim fieldvalue As String
For Each dr As DataRow In table.Rows
If sb.Length <> 0 Then
sb.Append(",")
End If
sb.Append("{")
Dim sb2 As New StringBuilder()
For Each col As DataColumn In table.Columns
Dim fieldname As String = col.ColumnName
If TypeOf (dr(fieldname)) Is Boolean Then
fieldvalue = Convert.ToBoolean(dr(fieldname))
Else
If TypeOf (dr(fieldname)) Is DateTime Then
fieldvalue = Convert.ToDateTime(dr(fieldname))
Else
fieldvalue = dr(fieldname).ToString()
End If
End If
If sb2.Length <> 0 Then
sb2.Append(",")
End If
If TypeOf (dr(fieldname)) Is Boolean Then
sb2.Append(String.Format("""{0}"":{1}", fieldname, fieldvalue.ToLower))
Else
If TypeOf (dr(fieldname)) Is DateTime Then
sb2.Append(String.Format("""{0}"":""{1:ddd, dd MMM yyyy HH':'mm':'ss 'EST'}""", fieldname, Convert.ToDateTime(fieldvalue)))
Else
sb2.Append(String.Format("""{0}"":""{1}""", fieldname, fieldvalue))
End If
End If
Next
sb.Append(sb2.ToString())
sb.Append("}")
Next
If e = makejson.e_with_square_brackets Then
sb.Insert(0, "[")
sb.Append("]")
End If
Return sb.ToString()
End Function
Public Enum makejson
e_without_square_brackets
e_with_square_brackets
End Enum
Thanks

Answer 1

My JSON feed for FullCalendar is written in PHP. I get the event info from my MySQL database and format it in PHP, and output it as a JSON file for the calendar. This is part of the code:
$jsonfeed = "[
";
while($row = mysql_fetch_array($result))
{
// some formatting happens here, then:
$jsonfeed .= "
{
\"title\" : \"" . $this_group . "\",
\"start\" : \"" . $row[formatDate] . " " . $row[formatStart] . "\",
\"end\" : \"" . $row[formatDate] . " " . $row[formatFinish] . "\",
\"description\" : \"" . $description . "\",
\"url\" : \"http://mysite.com/" . $row[id] . "\",
\"allDay\" : false
},";
}
// remove the final comma, add final ]
$jsonfeed = substr($jsonfeed, 0, -1) . "
]
";
This is what ended up working for me, after quite a number of variations. Apparently, I needed to have those line breaks (it just wouldn't work without them). So, that's something you might want to try. Also, I'm using a local time zone, so I didn't need the final "Z" and I have a space instead of the "T" between date and time. I don't know if that will affect your code, but it's something else to try.
Also, have you tried putting your JSON code through a validator, to check it?

Answer 2

Just the other day I was doing some debugging and introduced some linefeeds/carriage returns into some JSON which was used in an AJAX response. Safari did not mind but Firefox did not like it because linefeeds and carriage returns are not valid JSON, so that could well be your problem.

Answer 3

I think the problem is the quotes around the variables (aka: title, start, end, and allday). Remove the quotes and see what happens.
EDIT: An example from docs
$('#calendar').fullCalendar({
eventSources: [
// your event source
{
url: '/myfeed.php', // use the `url` property
color: 'yellow', // an option!
textColor: 'black' // an option!
}
// any other sources...
]
});