I’m, pretty new to D3 and I am trying to build a heat-map in D3. It has different years. Each year has its own day scale(on x-axis) and year label should also be shown but shared month-scale(on y-axis).
My sample data structure is as follows –

I need to render a heatmap with y labels on Y-axis, x labels on bottom X-axis and groups on top X-axis
each group has different number of days.In my dataset i have 36 objects, I’m supposed to see 36 rectangles