I create a chart using canvasjs. Values display in chart is from mysql database. All working but the problem is, it showing just 1 line on chart (sensors_pres) from table SensorData on chart not all three sensors_pres, sensors_temperature_data and sensors_humidity. Other problem is on range slider is not showing hour from 0 to 24, test it. Click in left-up on button all and in right-up you will see the number -1 to 96. How can i solve? I opened data.php file with browser and all values working correct.
Here is my html&javascript code
<!DOCTYPE HTML>
<html>
<head>
<script type="text/javascript" src="https://canvasjs.com/assets/script/jquery-1.11.1.min.js"></script>
<script type="text/javascript" src="https://canvasjs.com/assets/script/canvasjs.stock.min.js"></script>
<script type="text/javascript">
window.onload = function () {
$.getJSON("data.php", function (result) {
var stockChart = new CanvasJS.StockChart("chartContainer",{
title:{
text:"StockChart with Numeric Axis"
},
animationEnabled: true,
exportEnabled: true,
charts: [{
axisX: {
crosshair: {
enabled: true,
snapToDataPoint: true
}
},
axisY: {
crosshair: {
enabled: true,
//snapToDataPoint: true
}
},
data: [{
type: "line",
dataPoints: result
}]
}],
rangeSelector: {
inputFields: {
startValue: 00,
endValue: 24,
valueFormatString: "###0"
},
buttons: [{
label: "00",
range: 00,
rangeType: "number"
},{
label: "12",
range: 12,
rangeType: "number"
},{
label: "24",
range: 24,
rangeType: "number"
},{
label: "All",
rangeType: "all"
}]
}
});
stockChart.render();
})
}
</script>
</head>
<body>
<div id="chartContainer" style="height: 450px; width: 100%;"></div>
</body>
</html>
here is my php code:
<?php
header('Content-Type: application/json');
$con = mysqli_connect("fdb30.awardspace.net","3758712_lnd","bogdanutzu97","3758712_lnd");
// Check connection
if (mysqli_connect_errno($con))
{
echo "Failed to connect to DataBase: " . mysqli_connect_error();
}else
{
$data_points = array();
$result = mysqli_query($con, "SELECT * FROM SensorData");
while($row = mysqli_fetch_array($result))
{
$point = array("label" => $row['reading_time'] , "y" => $row['sensors_pres'],$row['sensors_temperature_data'],$row['sensors_humidity']);
array_push($data_points, $point);
}
echo json_encode($data_points, JSON_NUMERIC_CHECK);
}
mysqli_close($con);
?>
source https://stackoverflow.com/questions/68199972/how-to-display-three-lines-on-chart
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