You can retrieve the data points from the database and pass it on chart options as shown in below code snippet.
<?php
$dataPoints = array();
$con=mysqli_connect("localhost","root","","test"); //mysqli_connect("host","username","password","db"); - Refer https://www.w3schools.com/php/func_mysqli_connect.asp for more info
if (mysqli_connect_errno()) {
echo "Failed to connect to MySQL: " . mysqli_connect_error();
}
$sql="SELECT xval,yval FROM datapoints";
if ($result=mysqli_query($con,$sql)){
foreach($result as $row){
array_push($dataPoints, array("x"=> $row["xval"], "y"=> $row["yval"]));
}
}
mysqli_close($con);
?>
<!DOCTYPE HTML>
<html>
<head>
<script>
window.onload = function () {
var chart = new CanvasJS.Chart("chartContainer", {
animationEnabled: true,
exportEnabled: true,
theme: "light1", // "light1", "light2", "dark1", "dark2"
exportEnabled: true,
title:{
text: "PHP Column Chart from Database - MySQLi"
},
data: [{
type: "column", //change type to bar, line, area, pie, etc
dataPoints: <?php echo json_encode($dataPoints, JSON_NUMERIC_CHECK); ?>
}]
});
chart.render();
}
</script>
</head>
<body>
<div id="chartContainer" style="height: 360px; width: 50%; margin: auto;"></div>
<script src="https://cdn.canvasjs.com/canvasjs.min.js"></script>
</body>
</html>Please take a look at this Sample Project for complete working sample.
—
Vishwas R
Team CanvasJS