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Multiple charts from one JSON result

Viewing 5 posts - 1 through 5 (of 5 total)
  • February 27, 2015 at 5:31 pm #8276

    willibald

    Hi there!

    After struggeling with Google Charts, I would like to thank you for this great, flexible and easy to use chart library. But I have one question regarding JSON data. I have a JSON result from this query:

    $data_points = array();

    while($row = mysql_fetch_assoc($result)){
    $point = array(“label” => $row[‘timeStamp’] , “y” => $row[‘temp’], “y2” => $row[‘hum’]);

    array_push($data_points, $point);
    }
    echo json_encode($data_points, JSON_NUMERIC_CHECK);

    with this structure:

    [{“label”:”2015-02-27 09:54:50″,”y”:17.1,”y2″:35.2},{“label”:”2015-02-27 09:59:52″,”y”:17,”y2″:36.4},{“label”:”2015-02-27 10:01:33″,”y”:17,”y2″:36.5},{“label”:”2015-02-27 10:08:16″,”y”:17,”y2″:35.7}]

    How can I create two charts, one with label + y as values and one with label + y2 as values or one multiple series chart with both y values from this JSON result?

    Best regards,
    Willibald

    March 2, 2015 at 3:35 pm #8279

    Anjali

    [Update]

    Now we have a Tutorial on Creating Charts from JSON Data in our documentation.

    willibald,

    After getting Json result, create a HTML page that does AJAX request and fetch the data. After getting the data, it will render a Chart.

    Below is the sample code:

    <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://cdn.canvasjs.com/canvasjs.min.js"></script>
<script type="text/javascript">
 $(document).ready(function () {

	var dataPointsTemp = [];
	var dataPointsHumidity = [];

// Ajax request for getting JSON data

	$.getJSON("data.json", function(data) {
		for( var i = 0; i < data.length; i++) {
			dataPointsTemp.push({ label: data[i].label, y: data[i].y });
			dataPointsHumidity.push({ label: data[i].label, y: data[i].y2 });
		}	
	
		// Chart with label + y values

		var chart = new CanvasJS.Chart("chartContainer1",
		{
			title:{
				text: "Chart with y value"
			},	
			data: [
			{
				dataPoints: dataPointsTemp
			}]
		});
		chart.render();

		// Chart with label + y2 values

		var chart = new CanvasJS.Chart("chartContainer2",
		{
			title:{
				text: "Chart with y2 value"
			},		
			data: [
			{
				dataPoints: dataPointsHumidity
			}]
		});
		chart.render();

		// Chart with label + y and y2 values or multiSeries Chart

		var chart = new CanvasJS.Chart("multiChart",
		{
			title:{
				text: "Chart with y and y2 values"
			},		
			data: [
			{
				type: "line",
				dataPoints: dataPointsTemp
			},
			{				
				type: "line",
				dataPoints: dataPointsHumidity
			}			
			]
		});
		chart.render();
	});
});
</script>
<style>
	.chart {
		display: inline-block;
	}
</style>
</head>
<body>
<div id="chartContainer1" class="chart" style="width: 50%; height: 300px;></div>
<div id="chartContainer2" class="chart" style="width: 45%; height: 300px;></div>
<div id="multiChart" style="width: 80%; height: 300px;margin:auto;></div>
</body>
</html>

    Multiple chart from single JSON

    __
    Anjali

    March 2, 2015 at 5:43 pm #8280

    willibald

    Dear Anjali,

    thank you very much for this detailed explanation and your brilliant work in general. It helped me a lot.

    Kind regards from Germany,
    Markus

    July 16, 2018 at 3:47 pm #21842

    chanakeat

    Hi there!
    How can I render 2 line chart every second with my code.

    <script type="text/javascript">
		window.onload = function () {
			var dps1 = [];
			var dps2 = [];
			var chart = new CanvasJS.Chart("chartContainer", {
				toolTip:{
			   	shared: true,
			 	},
				data: [
					{
						type: "line",
						dataPoints: dps1
					},
					{
						type: "area",
						dataPoints: dps2
					}
				]
			});
			$.getJSON("data_1.php", function (data) {

				for( var i = 0; i < data.length; i++) {
					dps1.push({ label: data[i].label, y: data[i].y });
					dps2.push({ label: data[i].label, y: data[i].y2 });
				}
				
				chart.options.data[0].dataPoints = data;
				chart.render();	
			});
			var updateChart = function() {
			            
				$.getJSON("data_1.php", function (data) {
					chart.options.data[0].dataPoints = data;
					chart.render();
				});
			}            
			setInterval(function(){updateChart()},1000);
		}
	</script>
    July 16, 2018 at 6:32 pm #21848

    Priyanka M S

    @chanakeat,

    Can you kindly create and share a jsfiddle along with sample data, so that we can look into your code, understand your scenario better and help you out?

    __
    Priyanka M S
    Team CanvasJS

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