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How to create userfriendly canvas chart using javascript ?

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Show ResultJAVASCRIPT

<!DOCTYPE html>
<html>
<head>
<script src="https://canvasjs.com/assets/script/canvasjs.min.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.0/jquery.min.js"></script>
</head>

<body>

<input type="text" id="S3" value="20,50"></br>
<input type="text" id="S4" value="30,50"></p>

<div id="div1">
</div>

<script type="text/javascript">

$(document).ready(function () {

$("#S3").val(function (i, v) {
return v.replace(",", ".");
});

$("#S4").val(function (i, v) {
return v.replace(",", ".");
});

var chart = new CanvasJS.Chart("div1",
{

title: {
text: "My title"
},
animationEnabled: true,
theme: "theme2",
data: [
{
type: "doughnut",
indexLabelFontFamily: "Garamond",
indexLabelFontSize: 12,
startAngle: 0,
indexLabelFontColor: "dimgrey",
indexLabelLineColor: "darkgrey",
toolTipContent: "{y} %",

dataPoints: [
{ y: $("#S3").val(), indexLabel: "Something1" },
{ y: $("#S4").val(), indexLabel: "Something2" },

]
}
]
});

chart.render();

});

</script>

</body>
</html>