Formatted tooltips are a new feature in version 5.22 and make it super-easy to have unique tooltips but using just one specification in your configuration (as shown below).
This goes in the documents header:<script src="RGraph.common.core.js"></script> <script src="RGraph.common.dynamic.js"></script> <script src="RGraph.common.tooltips.js"></script> <script src="RGraph.bar.js"></script>Put this where you want the chart to show up:
<canvas id="cvs1" width="650" height="250">[No canvas support]</canvas> <canvas id="cvs2" width="650" height="250">[No canvas support]</canvas> <canvas id="cvs3" width="650" height="250">[No canvas support]</canvas>This is the code that generates the chart: