Chart JS - Bubble Chart is not getting rendered when loaded Dynamically - chart.js

Question

I would be glad if anyone can help me fix the problem i'm facing with Chart Js's Bubble Chart.
I am loading the chart dynamically based on change in drop down selection.
switch case is as below:
case "bar":
case "bubble":
case "line":
return {
type: value,
data: {
labels: labels,
datasets: [
{
data: data,
fill: false,
backgroundColor: colorCodes.chartBackGroundColor,
borderWidth: 1,
borderColor: colorCodes.chartGraphBorderColor,
hoverBorderWidth: 2
}
]
},
options: {
title: {
display: false
},
legend: {
display: false
},
layout: {
padding: 20
},
responsive: true,
maintainAspectRatio: false,
hover: {
animationDuration: 0
},
tooltips: {
enabled: false
},
animation: {
"duration": 1,
"onComplete": function () {
if (data.length > 0) {
var chartInstance = this.chart,
ctx = chartInstance.ctx;
ctx.font = Chart.helpers.fontString(Chart.defaults.global.defaultFontSize,
Chart.defaults.global.defaultFontStyle,
Chart.defaults.global.defaultFontFamily);
ctx.textAlign = 'center';
ctx.textBaseline = 'bottom';
this.data.datasets.forEach(function (dataset, i) {
var meta = chartInstance.controller.getDatasetMeta(i);
meta.data.forEach(function (bar, index) {
var data = data[index];
ctx.fillText(data, bar._model.x, bar._model.y);
});
});
}
}
},
scales: {
scaleOverride: true,
yAxes: [
{
scaleLabel: {
display: true,
labelString: chartTypeAndLabelConfig.yAxis.title,
fontSize: 20,
fontColor: "#1c969c"
},
display: true,
gridLines: {
display: true,
borderDash: [4, 2]
},
ticks: {
beginAtZero: true
}
}
],
xAxes: [
{
scaleLabel: {
display: true,
labelString: chartTypeAndLabelConfig.xAxis.title,
fontSize: 20,
fontColor: "#1c969c"
},
gridLines: {
display: false
}
}
]
}
}
};
the returned config is stored into a variable "chartConfig" and then the chart is created as below:
var chart = new Chart(ctx, chartConfig);
When dropdown is changed from bar to line or line to bar the chart is rendered, when i try to select bubble, i see same values plotted against x-axis and y-axis without any bubbles in the chart.
Example:
data = [1,2,3,4,5];
labels = [a,b,c,d,e];
when dropdown option for bubble is selected i get the chart rendered as:
When rendering chart dynamically, i'm also destroying the previously rendered chart and then rendering the chart based on the new config i get.
Is there anything i'm missing here?

Answer 1

I think the issue is that you need to convert the data into a format supported by bubble charts. For line and bar charts data can be integers or floats but for bubble charts they need to be Objects with a specified 'x', 'y' and 'r' (radius) value.
So for example to display a data in a bubble graph at point (1,4) with a radius of 10, you'll specify it as:
{x: 1, y: 4, r: 10}
One way of doing this could be to call a helper function before creating a bubble chart or storing a copy of the data as an Object to be used only for bubble charts. It really depends on how you've set up your project and if you are concerned about the number of computations carried out or not. Hope this helps!
Documentation for Chart.js Bubble Chart Data Structure