Is it possible to attach an onclick event to modify a data point in Chart.js?

Currently using chartjs for a small project and facing some challenges with editing data points.

Is there a built-in function in this library that allows me to bind an onclick event for displaying a pop-up and removing the point?

This is what I am looking to achieve:

  1. Click on a data point, see a popup
  2. Remove the data point by clicking on a remove button, then redraw the updated chart. Currently working with a simple line chart available in my jsFiddle example

The version of chartjs being used is 2.6

javascriptchart.jschart.js2chartjs-2.6.0

Answer №1

If you want to display a popup using the onclick event in the option section, you can achieve this by utilizing the chart.js library. After checking if a point was clicked using the getElementsAtEvent method, you can remove it from the chart's options and then proceed to update the chart using the update function. An updated JSFiddle example is also provided for reference.

var option = {
    showLines: true,
    onClick: function(evt) {   
      var element = myLineChart.getElementAtEvent(evt);
      if(element.length > 0)
      {
        var ind = element[0]._index;
        if(confirm('Do you want to remove this point?')){
          data.datasets[0].data.splice(ind, 1);
          data.labels.splice(ind, 1);
          myLineChart.update(data);
        }
      }
    }
};

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