ChartWidget line stacked

[ricksieper]

Package

Widgets

Package Version

3.2.137

How can we help you?

hello
i have a ChartWidget with the type line

my (simplified) function getData is like this

protected function getData(): array
    {
return [
            'labels' =>["success","fail"],
            'datasets' => [
                [
                    'label' => ["foo",'foo_2'],
                    'data' => [18,31],
                    'stack' => 'total', // Enable stacking
                ],
                [
                    'label' => ["foo",'foo_2'],
                    'data' => [40,25],
                    'borderColor' => 'rgb(239 68 68)',
                    'stack' => 'total', // Enable stacking
                ],
            ],
            'options' => [
                'responsive' => true,
                'maintainAspectRatio' => false,
                'scales' => [
                    'x' => ['stacked' => true], // X-axis does not affect stacking
                    'y' => ['stacked' => true], // Allow proper stacking via computed dataset
                ],
                'elements' => [
                    'line' => ['fill' => true], // Ensures filled areas stack correctly
                ],
            ]
        ];
}

I except the data are stacked but no it is not the case

I have this result

if I remove one source and restore it this time my data are stacked

what I did wrong and how to make the data stacked the first time ?

thanks for your help