Refresh Special div or section on page

[arra...@gmail.com]

Hello Every one,

I am creating a book reading application. Where i am updating how many percentages you have read the book.

It is working parallel while reading a book. I am not able to update the percentage on HTML, There is a div that needs to update and complicate again to show progress update with a color filled circle at same % level. 

I do not know how to do it.

[arra...@gmail.com]

Application is in angular 7