[Chartjs]-Chart.js uncaught reference error while updating

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the chart needs to be declared outside of the function –> drawBarChart
in order to be accessed from another function –> update

like this… 

// add declaration here
var myChart;

function drawBarChart() {

console.log("drawing bar . . .");


var myCanvas = document.getElementById("myCanvas");

var ctx = myCanvas.getContext('2d');

// remove var here
myChart = new Chart(ctx, {

...

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