Detecting hover events over parts of a chart using Chart.js

Question

I\'ve made a pie chart using Chart.js, and I\'d like to detect when a segment is hovered over. I\'ve found plenty of documentation regarding manipulating the tooltips that a

Answer 1

If found a small trick using customTooltip, too. I searched for a solution to get an Event if the user moves with the mouse over a Value and a Tooltip is shown. Mainly i liked to present in a different frame some detail informations besides the raw Plot values.

var options = {            
  customTooltips: function (tooltip)
  {
    if (!tooltip) return;

    tooltip.custom = false;
    tooltip.draw();
    OnEntrySelected(tooltip.title);
    tooltip.custom = this;
  }
}

The custom tooltip is drawn using tooltip.draw(), but this calls the custom method. I set it to false to avoid a recursive loop, call the default behavior and take the data i need for my callback (OnEntrySelected) which is in this case the string of the x-Axis label. This event is triggered whenever the tooltip is shown.