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After looking into your code we have come across few issues in your code which are mentioned below :

1) Before creating a chart object you are trying to assign result to it’s options chart.options.data[0].dataPoints = result; Which will throw an error “Uncaught TypeError: Cannot read property ‘options’ of undefined”.

2) Before making an AJAX request you are not including jQuery file which will throw an error “Uncaught ReferenceError: $ is not defined”.

3) The way you are assigning result as well hard coded data to dataPoints is syntactically wrong

Please refer to the below code with issue fixed:

<!DOCTYPE html>
<script src="https://canvasjs.com/assets/script/jquery-1.11.1.min.js"></script>
<script src="https://cdn.canvasjs.com/canvasjs.min.js"></script>
window.onload = function () {
	$.getJSON("data.php", function (result) {
		var chart = new CanvasJS.Chart("chartContainer", {
			axisX: {
				title: "Weeks",
				//interval: 1,
				//intervalType: "day",
				labelAngle: -45
			axisY: {
				title: "Percentage",
			data: [
				type: "spline",
				dataPoints: result
			legend: {
				cursor: "pointer",
				itemclick: function (e) {
					if (typeof (e.dataSeries.visible) === "undefined" || e.dataSeries.visible) {
						e.dataSeries.visible = false;
					} else {
						e.dataSeries.visible = true;
	<div id="chartContainer" style="width: 50%; height: 300px"></div>

Chart with data from MySQL in PHP