Chartjs : Remove specific labels

Question

I have the below stacked group chart.

<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.7.2/Chart.min.js"></script>
    <script>
        var barChartData = {
        labels: ['January', 'March', 'June', 'September', 'December'],
        datasets: [{
                label: 'Apple',
                borderColor: 'rgba(255, 50, 50,1)',
                backgroundColor: 'rgba(255, 50, 50,0.5)',
                stack: 'Stack 0',
                data: [3,6,4,8,2]
        }, {
                label: 'Orange',
                borderColor: 'rgba(255, 160, 242,1)',
                backgroundColor: 'rgba(255, 160, 242,0.5)',
                stack: 'Stack 0',
                data: [2,1,3,0,1]
        }, {
                label: 'Pear',
                borderColor: 'rgba(79, 158, 255,1)',
                backgroundColor: 'rgba(79, 158, 255,0.5)',
                stack: 'Stack 0',
                data: [3,4,1,5,2]
        }, {
                label: 'Apple',
                borderColor: 'rgba(255, 50, 50,1)',
                backgroundColor: 'rgba(255, 50, 50,0.5)',
                stack: 'Stack 1',
                data: [7,16,10,8,5]
        },{
                label: 'Mango',
                borderColor: 'rgba(100, 244, 97,1)',
                backgroundColor: 'rgba(100, 244, 97,0.5)',
                stack: 'Stack 1',
                data: [4,9,12,5,7]
        }, {
                label: 'Banana',
                borderColor: 'rgba(255, 252, 91,1)',
                backgroundColor: 'rgba(255, 252, 91,0.5)',
                stack: 'Stack 1',
                data: [3,6,13,14,5]
        }, {
                label: 'Orange',
                borderColor: 'rgba(255, 160, 242,1)',
                backgroundColor: 'rgba(255, 160, 242,0.5)',
                stack: 'Stack 1',
                data: [7,12,3,0,2]
        }, {
                label: 'Cherry',
                borderColor: 'rgba(255, 132, 38,1)',
                backgroundColor: 'rgba(255, 132, 38,0.5)',
                stack: 'Stack 1',
                data: [8,4,7,11,6]
        }, {
                label: 'Pear',
                borderColor: 'rgba(79, 158, 255,1)',
                backgroundColor: 'rgba(79, 158, 255,0.5)',
                stack: 'Stack 1',
                data: [8,14,9,12,16]
        }]

      };

      var ctx = document.getElementById("myChart");
      var myChart = new Chart(ctx, {
        type: 'bar',
        data: barChartData,
        options: {
                legend: {
                        display:true,   
                },
                tooltips: {
                        mode: 'x',
                        intersect: false
                },
                responsive: true,
                scales: {
                        xAxes: [{
                                stacked: true,
                        }],
                        yAxes: [{
                                stacked: true
                        }]
                }
        }

      });
    </script>

I would like to do two things:

1) Remove the redundant Apple, Orange and Pear labels 2) Highlight/Darken just the border on the individual stacks in the graph with the colors of those individual stacks. Like how the legend is.

Any help would be greatly appreciated. Image of my graph

Answer 1

You can add custom logic to legend options like:

options: {
   legend: {
      display: true,
          labels: {
              generateLabels: function (chart) { ...

You can reach the labels here, customize their color, text, you can group them etc. So in this case you have to group the labels by their text first like

const labelTexts = []
const newLabels = []
labels = Chart.defaults.global.legend.labels.generateLabels(chart);
// group labels
labels.map((label) => {
    if (labelTexts.indexOf(label.text) === -1) {
        labelTexts.push(label.text)
    }
})
labelTexts.map((text) => {
    labels.map((label) => {
        if (label.text === text) {
            newLabels.push(label)
        }
    })
})

Then you can remove the redundant labels like:

for (var i = 0; i < newLabels.length - 2; i++) {
    if (newLabels[i].text !== newLabels[i + 1].text) {
        newLabels2.push(newLabels[i])
    }
}

Check a working example here