Drag and drop value from image map?

Is it possible to assign a value to a certain section of an image map,
then have the value available through drag and drop for text fields. ?

For example, suppose I have a picture with a scale of numbers on it.
I divide the picture into parts where each number is mapped. Then, the
user clicks on a number, holds the click while dragging to a text
field and releases in the text field.

Any links to similar topics or help will be appreciated.

J