Learn D3.js

Custom events and dispatching

An event dispatch can be used to directly invoke listeners for an event. This is useful if your application uses custom events, or if for some reason you need to call another object's event handler. Custom events can be used for communication between parts of your application—for example, to display multiple charts and have them update at the same time in response to data changes or user interaction, or to compose many native events to perform a complex behavior.

The following table lists methods from the d3-selection and d3-dispatch modules that are to be used for event dispatching and custom events:

Function or method	Description
selection.dispatch(type, options)	A d3.selection method that dispatches ...