Odoo api. onchange decorator is used to invoking a method when a field's value changed. It can be used to validate the data or to trigger an action. A detailed explanation of the technical and functional aspects of the Onchange mechanical of Odoo. Furthermore, an insight into the Odoo api.onchange decorator operations which are used to invoke a method when a field's value changes in the platform Odoo api. onchange decorator is used to invoking a method when a field's value changed. It can be used to validate the data or to trigger an action. A detailed explanation of the technical and functional aspects of the Onchange mechanical of Odoo. Furthermore, an insight into the Odoo api.onchange decorator operations which are used to invoke a method when a field's value changes in the platform