i want to make chart with mysql database. I have two columns - timestamp and temperature. This is the timestamp format - 2015-06-11 22:45:59 and the temperature is integer. Im not sure that my conversion of timestamp to javascript time is correct i have or maybe i have other mistake. this is my code:
data.php
<?
define('DBHOST','localhost');
define('DBUSER','root');
define('DBPASS','...');
define('DBNAME','diplomna2');
try {
//create PDO connection
$db = new PDO("mysql:host=".DBHOST.";port=3306;dbname=".DBNAME, DBUSER, DBPASS);
$db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
} catch(PDOException $e) {
//show error
echo '<p class="bg-danger">'.$e->getMessage().'</p>';
exit;
}
$stmt = $db->query('SELECT * FROM temperature');
$res=array();
while ($row = $stmt->fetch(PDO::FETCH_ASSOC)) {
$row['timestamp'] = strtotime($row['timestamp']);
$row['timestamp'] *=1000;
echo $res="[".$row['timestamp'] . ',' . $row['temperature'] ."]";
}
?>
this is the output:
[1434051959000,25][1434051969000,26][1434051979000,26][1434051990000,28][1434052000000,27][1434052024000,25][1434052034000,24][1434052044000,23]
html file:
<!DOCTYPE HTML>
<html>
<head>
<script type="text/javascript" src="js/jquery-1.7.1.min.js" ></script>
<script src="http://code.highcharts.com/stock/highstock.js"></script>
<script src="http://code.highcharts.com/stock/modules/exporting.js"></script>
<script type="text/javascript">
$(function() {
$.getJSON('data.php', function(data) {
// Create the chart
$('#container').highcharts('StockChart', {
rangeSelector : {
inputEnabled: $('#container').width() > 480,
selected : 1
},
title : {
text : 'Temperature'
},
series : [{
name : 'temperature',
data : data,
type : 'areaspline',
threshold : null,
tooltip : {
valueDecimals : 2
},
fillColor : {
linearGradient : {
x1: 0,
y1: 0,
x2: 0,
y2: 1
},
stops : [
[0, Highcharts.getOptions().colors[0]],
[1, Highcharts.Color(Highcharts.getOptions().colors[0]).setOpacity(0).get('rgba')]
]
}
}]
});
});
});
</script>
</head>
<body>
<div id="container" style="height: 400px; min-width: 310px"></div>
</body>
</html>
Correct way to make JavaScript understand your PHP array is json_encode()
Change your code block near while
to
$res = [];
while ($row = $stmt->fetch(PDO::FETCH_ASSOC)) {
$res[] = [ strtotime($row['timestamp'])*1000, $row['temperature'] ];
}
echo json_encode($res);
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