Question

I am trying to parse json data created by a php file to another script and display its values to a highchart.

My data.php which creates the json data is this:

<?php
header("Content-type: application/json");

$dbhost = "localhost";
$dbuser = "db";
$dbpass = "xxxxx";
$dbname = "db";
$db = mysql_connect($dbhost, $dbuser, $dbpass); 
mysql_select_db($dbname,$db);
$query = "SELECT * FROM monitor_total";

$result = mysql_query($query,$db);

while($row = mysql_fetch_array($result)) {
  $date = $row["date"];
  $count = $row["count"];
  $array[] = array("date" =>$date,"count"=>$count);
}
echo json_encode($array);
?>

the data.php output is:

[{"date":"2012-11-23","count":"582311"},{"date":"2012-11-24","count":"582322"},{"date":"2012-11-22","count":"582121"},{"date":"2012-11-21","count":"581321"},{"date":"2012-11-19","count":"572821"},{"date":"2012-11-20","count":"581321"},{"date":"2012-11-18","count":"582421"},{"date":"2012-11-17","count":"579321"},{"date":"2012-11-16","count":"581321"},{"date":"2012-11-25","count":"558178"}]

inside <script>:

var monitor_graph; // globally available
    monitor_graph = new Highcharts.Chart({
     chart: {
        renderTo: 'graph',
        type: 'spline',
        events: {
            load: requestData
        }
     },
     title: {
        text: 'Registered and total players by date'
     },
     xAxis: {
       categories: []
     },
     yAxis: {
        title: {
           text: 'Players'
        }
     },
     series: [{
        name: 'Total Players',
        data: []
     }]
  });
function requestData() {
$.ajax({
        url: 'data.php',
    success: function(data) {
       $.each(data, function(i,item){

              monitor_graph.series[0].setData(??????????);

       });
     setTimeout(requestData, 1000);
    },
});
}

How i create a serie named total players with ‘item.date’ in x-axis and ‘item.count’ in y-axis???

Please help me!

UPDATE:
i add this inside each:

monitor_graph.xAxis[0].setCategories([item.date]);
monitor_graph.series[0].setData([parseFloat(item.count)]); 

and i now get the 1 point exactly as i need it but with the following error:

Unexpected value NaN parsing y attribute.

Answer 1

you need to modify your success callback to something like this

var categories=[];
var seriesData=[];
$.each(data,function(){
    categories.push(this.date);
    seriesData.push(parseInt(this.count));
});
chart.xAxis[0].setCategories(categories);
chart.series[0].setData(seriesData);

the Series.setData() method expects an array of int/float and not strings and should be called with entire data set and not each point. You were doing this inside the $.each should be done outside this loop. Same goes with categories

Demo @ jsFiddle