I use this great to plugin to let others can change a certain custom field.
For example, a post contains field1, field2, field3
editable_post_meta( get_the_ID(), field1, 'input' );
When the field1 is changed, I want to calculate the average of these 3 fields and add this field automatically to a new field named aver_field.
Can you tell where to add this process script?
Thanks a lot!