I use Highcharts and when I update the site it doesn't update the data from which it constructs the graph.
I take the data from mysql, save it in a .csv file and open the .csv in highcharts. It seems to save the old values in the graph even if the .csv file is updated.
<?php
unlink('column-data.csv'); //This file must exist or else it gives error
include 'database.php';
$result = mysql_query("SELECT
value
FROM
data
INTO OUTFILE 'C:/xampp/htdocs/arduinoproj/test3/column-data.csv'
FIELDS ENCLOSED BY '\,'
TERMINATED BY ';'
ESCAPED BY '\"'
")
or die("Could not issue MySQL query");
include 'highcharts.php'
?>
..and the highcharts code is more or less unchanged.
The changed code from the original is in bold. Highcharts code:
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>My first column chart by Highcharts</title>
<!-- 1. Add JQuery and Highcharts in the head of your page -->
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.10.1/jquery.min.js"></script>
<script src="http://code.highcharts.com/highcharts.js"></script>
<!-- 2. You can add print and export feature by adding this line -->
<script src="http://code.highcharts.com/modules/exporting.js"></script>
<!-- 3. Add the JavaScript with the Highchart options to initialize the chart -->
<script type="text/javascript">
jQuery(document).ready(function() {
var options = {
chart: {
renderTo: 'container',
**type: 'line'**
},
title: {
text: 'Tiny Tool Monthly Sales'
},
subtitle: {
text: '2014 Q1-Q2'
},
xAxis: {
categories: []
},
yAxis: {
title: {
text: 'Sales'
}
},
series: []
};
// JQuery function to process the csv data
$.get(**'column-data.csv'**, function(data) {
// Split the lines
var lines = data.split('\n');
$.each(lines, function(lineNo, line) {
var items = line.split(',');
// header line contains names of categories
if (lineNo == 0) {
$.each(items, function(itemNo, item) {
//skip first item of first line
if (itemNo > 0) options.xAxis.categories.push(item);
});
}
// the rest of the lines contain data with their name in the first position
else {
var series = {
data: []
};
$.each(items, function(itemNo, item) {
if (itemNo == 0) {
series.name = item;
} else {
series.data.push(parseFloat(item));
}
});
options.series.push(series);
}
});
//putting all together and create the chart
var chart = new Highcharts.Chart(options);
});
});
</script>
</head>
<body>
<!-- 3. Add the container -->
<div id="container" style="width: 600px; height: 400px; margin: 0 auto"></div>
</body>
</html>
