C3: Change donut title (Interior text) dynamically with chart loads

[kethomassen]

Is there a way to make the title inside the donut chart change to the sum of all the data values, updating automatically with every data load into the chart?

[vishal-kony]

You can use this to change the title dynamically.
d3.select('#div_id .c3-chart-arcs-title').node().innerHTML = "new title";

where div_id is the id of the div to which your chart is bounded.
you may have to write the logic to calculate sum on your own

[asadchachar]

and how can we change font and color dynamically?

[AfzalH]

I was able to do it following vishal-kony's advice.
However it will be better if c3 library provides an API for this. Something like
chart.updateTitle('donut','new title');