Guide to updating the canvas in Chart.js based on a user-defined x-axis range

What I currently have:

My chart.js canvas displays values on the x-axis ranging from 1 to 9. Users can input a new range to view a different scope, with default limits set at start = 3 and end = 6 in my repository.

I already have a function that restricts the data displayed on the graph, but I'm unsure how to trigger an update when the user changes the range outside of the canvas.

What I need help with: How can I force the chart to update dynamically?

Repository: https://stackblitz.com/edit/angular-ng2-charts-new-range-x-axis

angulartypescriptchart.js

Answer №1

When you make changes to the chart's labels, ensure that you also update the corresponding values in the data array of the respective dataset.

There is no requirement to manually call chart.update(); with ng2-charts, Angular's change detection mechanism automatically handles updates to the chart when its data or options change.

To adjust the updateChart method for proper functionality, consider the following modifications:

updateChart(start, end) {
  const labels = [];
  const data = []; 
  this.lineChartLabels.forEach((l, i) => {
    if (l >= start && l <= end) {
      labels.push(l); 
      data.push(this.seriesB[i]);
    }
  });
  this.lineChartLabels = labels;
  this.lineChartData[0].data = data;
}

Please review the revised code on your customized StackBlitz project.

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