How to do Group Stacking available in ng2-charts? - ng2-charts

Question

In the original Chart.js the Dataset Structure has a property called stack which can be used to stack group of data sets separately.
"stack: String The ID of the group to which this dataset belongs to (when stacked, each group will be a separate stack)"
I tried doing this in ng2-charts like so:
public barChartData: any[] =[
{
data: [],
label: 'Label',
type: 'bar',
stack: '1'
}
]
But didn't do anything.
Here is the dataset property from the ng2-charts:
datasets (Array<{data: Array | number[], label: string}>) - data see about, the label for the dataset which appears in the legend and tooltips
Is there a work around for stacking groups separately?
Thank you!

Answer 1

You are right about what the documentation says, I'm trying to do the same thing. I tried this as an example, it should work, according to the link : http://www.chartjs.org/docs/latest/charts/bar.html
in my .ts :
public barChartData:any[]=[
{data: [65, 59, 80, 81, 56, 55, 40], label: 'Series A', stack: '1'},
{data: [28, 48, 40, 19, 86, 27, 90], label: 'Series B', stack: '1'},
{data: [42, 24, 71, 14, 31, 49, 30], label: 'Series C', stack: '2'}
];
public barChartLabels:string[] = ['2006', '2007', '2008', '2009', '2010', '2011', '2012'];
public barChartOptions:any = {
responsive: true,
scales:{
xAxes:[{
stacked:true
}],
yAxes:[{
stacked:true
}]
}
};
public barChartType:string = 'bar';
in my HTML :
<canvas id="chart1" baseChart
[datasets]="barChartData"
[labels]="barChartLabels"
[options]="barChartOptions"
[chartType]="barChartType"
(chartHover)="chartHovered($event)"
(chartClick)="chartClicked($event)"></canvas>
I found this sample of chart.js for grouped stack bar. Unfortunately it's plain JS : https://github.com/chartjs/Chart.js/blob/master/samples/charts/bar/stacked-group.html
EDIT :
use my code above and do npm install chart.js#2.6 --save
-> it worked directly for me
I found this solution while checking if stacks were checked when creating the bars. they weren't in my current version.

Answer 2

So I figured out that the way to do this is to un-stack the yaxis and then add the stack to the dataset property like so:
{
data: [],
label: 'dataset 1',
type: 'bar',
yAxisID: 'bar-y-axis1',
stack: '1'
},
{
data: [],
label: 'dataset 3',
type: 'bar',
yAxisID: 'bar-y-axis1',
stack: '1'
},
{
data: [],
label: 'dataset 4',
type: 'bar',
yAxisID: 'bar-y-axis1',
stack: '1'
},