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i Live-Daten aus MySQL-Datenbank abrufen bin versucht, und es mit highcharts zeigen aber etwas scheint falsch zu sein, weil alles, was ich bekommen ein leeres Diagramm istLive-Daten mit highcharts
hier ist mein Code
<!DOCTYPE html>
<html>
<head>
<title>Live Messages</title>
<script src="//code.jquery.com/jquery-1.11.3.min.js"></script>
<script src="//code.highcharts.com/highcharts.js"></script>
<script>
var chart;
var dataSource = 'http://localhost/live/data.php?format=json';
function requestData() {
$.ajax({
url: dataSource,
success: function(points) {
chart.series[0].setData(
points,
true
);
// refresh after X miliseconds
setTimeout(requestData, 1000);
},
cache: false
});
}
$(document).ready(function() {
//add our div for the chart
$("#container").append("<div id=chart-trend></div>");
chart = new Highcharts.Chart({
chart: {
renderTo: 'chart-trend',
defaultSeriesType: 'spline',
events: {
load: requestData()
},
animation: {
duration:1000
}
},
title: {
text: 'temperateur'
},
subtitle: {
text: 'past 24 hours'
},
xAxis: {
type: 'datetime',
title: {
text: 'date'
}
},
yAxis: {
title: {
text: 'temp',
margin: 10
}
},
series: [{
showInLegend: false,
data: [],
// pointInterval: 3600*1000/minute
}]
}); //end chart
}); //end document.ready
</script>
</head>
<body>
<div id="container"></div>
</body>
</html>und hier ist die Datenbankverbindung
<?php
/*
Get data from the mysql database and return it in json format
*/
//setup global vars
$format = $_GET['format'];
if($format=='json'){
header("Content-type: text/json");
}
$db = new mysqli('localhost', 'root', '', 'hicharts', 3306);
if (mysqli_connect_error()) {
die('Connect Error (' . mysqli_connect_errno() . ') '
. mysqli_connect_error());
}
// get data
$sql = "select dat,temp from temperateur";
if ($result = $db->query($sql)) {
// $row = mysqli_fetch_array($result, MYSQLI_NUM);
while($row = $result->fetch_array()){
$rows[] = $row;
}
foreach($rows as $row){
$datetime = strtotime($row['dat'])*1000;
$temp = (int)$row['temp'];
$data[] = array($datetime, $temp);
}
echo(json_encode($data));
$result->close();
} else {
echo "Error: " . $sql . "<br>" . $db->error;
}
$db->close();
?>jede Hilfe