Great Chart Improvement Idea

[gpena208777]

I use Charts.js for a project that also uses a graph.
On hover over - the tooltip displays both data values without clicking. This makes data viewing at specific points very nice.
Hovering horizontally across the chart pops up a vertical "crosshair" line at that time index.

Here are the configs to achieve this.

interaction: {
    intersect: false,
    mode: 'index'
}

mode: 'index' → When you hover anywhere along the X-axis, Chart.js will display tooltips for all datasets at that index (so both Chimney Exit and Stove Exhaust values show up at once).
intersect: false → You don’t need to hover directly on a point/line. Hovering near the vertical line will still trigger the tooltip for both series.

[terratec]

Yes it works perfectly (including the callbacks for the custom labels)