How to create a bitcoin price widget is Chapter 7 of my book (a portion of chapter 7 is available in the "look inside" preview). https://www.amazon.com/Building-Bitcoin-Websites-Beginners-Development/dp/153494544X
Or you can watch my youtube tutorial video on how to create one for free:
https://www.youtube.com/watch?v=uVlMueUBGOoHave fun, and good luck!
Thanks @coinableS!! You've explained this really well! Thanks for the tutorials! I'm considering to buy your book. Is it explained how to build bitcoin widget such as
http://screencast.com/t/t4MPb7wLHzRmAnd extract JSON API on web page like
http://coincap.io/What else can I get from the book please? Thank you!
Regards,
Mark