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Live Updating Charts from JSON API & AJAX

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  • #26677

    I’m using the example copied directly from the web page: “Live Updating Charts from JSON API & AJAX”

    I’ve put it on my apache server.

    It doesn’t seem to work.

    I just get a blank page.

    I cut and copied the text below directly from the example on the page. i’ve even tried setting CORS. HELP!!!

    —–

    <!DOCTYPE HTML>
    <html>
    <head>
    <script type="text/javascript">
    window.onload = function() {
    	var dataPoints = [];
    	var chart;
    	$.getJSON("https://canvasjs.com/services/data/datapoints.php?xstart=1&ystart=10&length=10&type=json", function(data) {  
    		$.each(data, function(key, value){
    			dataPoints.push({x: value[0], y: parseInt(value[1])});
    		});
    		chart = new CanvasJS.Chart("chartContainer",{
    			title:{
    				text:"Live Chart with dataPoints from External JSON"
    			},
    			data: [{
    				type: "line",
    				dataPoints : dataPoints,
    			}]
    		});
    		chart.render();
    		updateChart();
    	});
    	function updateChart() {
    	$.getJSON("https://canvasjs.com/services/data/datapoints.php?xstart=" + (dataPoints.length + 1) + "&ystart=" + (dataPoints[dataPoints.length - 1].y) + "&length=1&type=json", function(data) {
    		$.each(data, function(key, value) {
    			dataPoints.push({
    			x: parseInt(value[0]),
    			y: parseInt(value[1])
    			});
    		});
    		chart.render();
    		setTimeout(function(){updateChart()}, 1000);
    	});
    	}
    }
    </script>
    <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.min.js"></script>
    </head>
    <body>
    <div id="chartContainer" style="height: 300px; width: 100%;"></div>
    </body>
    </html>
    #26682

    @gmulligan

    For security reasons, cross-origin requests are restricted by browsers. JSONP allows you to sidestep the cross-origin requests. To access JSON from a different domain, you can refer to JSONP. Please take a look at this JSFiddle that creates a line chart from AJAX & JSONP.

    —-
    Manoj Mohan
    Team CanvasJS

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