on_change of fields#
Tryton allows developers to define methods that can be called once a field’s value has been changed by the user. The instance method has the following name:
on_change_<field name>
An instance of Model
is created by using the values
from the client’s fields specified by the
on_change
list defined on the field.
Any change made on the instance will be pushed back to the client-side record.
There is also a way to define a method that must update the value of a field
whenever any field from a predefined list is modified.
This list is defined by the on_change_with
attribute of the field.
The method that will be called has the following name:
on_change_with_<field_name>
Just like for the classic on_change
, an instance of
Model
is created by using the values from the client’s
fields specified by the on_change_with
attribute.
The returned value of the method is pushed back to the client-side record as
the new value of the field.