Odoo 12 Development Essentials - Fourth Edition

On-change events

The on-change mechanism allows us to change values in other form fields when a particular field is changed. For example, the on-change on a product field can set the price field to a default value whenever the product is changed.

In older versions, the on-change events were defined at the view level, but since version 8.0 they are defined directly on the model layer, without the need for any specific markup on the views. This is done with creating methods, using the @api.onchange('field1', 'field2', ...) decorator to bind on-change logic to some fields. The on-change model methods are discussed in more detail in Chapter 8, Business Logic – Supporting Business Processes, and an example is discussed there.

The on-change mechanism ...