Tips for displaying bar chart labels effectively with ChartJS

I am working on an Angular project and I would like to incorporate a barchart using ChartJS. The data for this chart can vary in size, sometimes being very large.

One issue I have encountered is that when the number of data points is large, the labels overlap each other as shown in this image: https://i.sstatic.net/bVhaQ.png

I am seeking advice on how to automatically adjust the spacing to ensure the labels are displayed correctly?

Here is a snippet of the source code:

  // Bar chart mock data
  barChartOptions:any = {
  scaleShowVerticalLines: true,
  responsive: true
  };
  barChartLabels:string[] = ['2018-10-02 15:26:41', ...];
  barChartType:string = 'horizontalBar';
  barChartLegend:boolean = true;
  barChartData:any[] = [{data: data, label: 'Kilometre per Litre'}];

html

<div style="display: block">
   <canvas baseChart id="mpgChart"
       [datasets]="barChartData"
       [labels]="barChartLabels"
       [options]="barChartOptions"
       [legend]="barChartLegend"
       [chartType]="barChartType"
       (chartHover)="chartHovered($event)"
       (chartClick)="chartClicked($event)"></canvas>
</div>

scss

 #mpgChart{
    height: 100%;
    width: 100%;
  }

Answer №1

One solution is to try enabling autoSkip: true. In normal Chart.JS, you would implement it like this, but I'm not certain about the method for Angular2 Chart.js.

scales: {
  xAxes: [{
    ticks: {
      autoSkip: true
    }
  }]
}

To enhance text readability, you can also include minRotation: 30 to rotate the text.

** Edit **

barChartOptions:any = {
  scaleShowVerticalLines: true,
   scales: {
    xAxes: [{
      ticks: {
        autoSkip: true
      }
     }]
  },
  responsive: true
};

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