ZingChart: Color scale indicator for heat maps

A color scale indicator for a heat map shows the color gradient change from the min to max value. You can make a color scale indicator for heat maps in ZingChart by using css and html. The trickiest part of it would be setting up the gradient which in css is just background: linear-gradient(to right, white, blue);

Here is an example demo of how to implement this: 

Relative Links:

1. https://demos.zingchart.com/view/J1HX5KXS