Highchart not displaying json data - json

Question

I can't figure out what I'm doing wrong with my Highchart. It's supposed to read a json array, (really just a date, and a y value and plot it to a chart. However, I can't seem to get any points to plot to a chart. What am I doing wrong?
php code:
$statement = "select count(title) from node where title like 'WEN%'";
$result = mysql_query($statement);
while ($row = mysql_fetch_array($result)) {
$data = $row['count(title)'];
}
$x = time() * 1000;
$y = $data;
$array = array($x,$y);
echo json_encode($array);
html/javascript code:
<p>Chart</p>
<div id="container" style="min-width: 400px; height: 400px; margin: 0 auto">
<script>
function requestData() {
jQuery.ajax({
url: 'queryp.php',
datatype: 'json',
success: function(point) {
var series = chart.series[0];
// add the point
chart.series[0].addPoint(point, true);
// call it again after one second
setTimeout(requestData, 5000);
},
cache: false
});
}
</script>
<script type="text/javascript">
jQuery(function () {
jQuery(document).ready(function() {
Highcharts.setOptions({
global: {
useUTC: false
}
});
chart = new Highcharts.Chart({
chart: {
renderTo: 'container',
type: 'spline',
marginRight: 10,
events: {
load: requestData
}
},
title: {
text: 'Live Query Data'
},
xAxis: {
type: 'datetime',
tickPixelInterval: 150
},
yAxis: {
title: {
text: 'Value'
},
plotLines: [{
value: 0,
width: 1,
color: '#808080'
}]
},
legend: {
enabled: true
},
exporting: {
enabled: false
},
series: [{
name: 'Query Data',
data: []
}]
});
});
});
</script>
</div>

Answer 1

Your series[0] object has no method named addPoint, you should see this in the console.
If you want to append to the data array, just use push
chart.series[0].data.push(point[1]);

Answer 2

The problem is that you are referencing to chart variable, which is not ready yet - you are using load event handler. Use something like this:
function requestData() {
var series;
if(chart.series[0]){
/* all other cases load chart */
series = chart.series[0];
} else {
/* first load chart */
series = this.series[0];
}
jQuery.ajax({
url: 'queryp.php',
datatype: 'json',
success: function(point) {
series.addPoint(point, true);
setTimeout(requestData, 5000);
}
});
}
Also, make sure that values are numbers. Not strings.