Handlers

The handlers module lets you define reactions to events.

Handlers respond to Events and return zero, one, or many Effects.

There are some special types of handlers, like Protocols and CronTasks. These offer a differentiated interface for their particular use-cases. For example, CronTasks only ever respond to the CRON event, require a schedule to be specified, and expect the execute method to be implemented rather than compute.

Action Button

Add a button that executes your custom code when clicked.
Abridged source code of an action button implementation. Image of an action button in a note header.

Application

Launch an iframe when your icon is clicked in the app drawer.
Abridged source code of an application implementation. Image of application icons in the app drawer.

Cron Task

Execute your code on a cron-like schedule.
Abridged source code of an action button implementation. Picture of Mr. Cron, the little time monster that remembers which tasks should be executed at any given time.

Base Handler

Respond to events with your custom code.
Abridged source code of a base handler implementation. Stylized text that reads 'When X occurs, under Y conditions, I want Z to happen'.





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