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Dispatching Events with d3.dispatch

Remarks:

Dispatching is a convenient mechanism for separating concerns with loosely-coupled code: register named callbacks and then call them with arbitrary arguments. A variety of D3 components, such as d3-request, use this mechanism to emit events to listeners. Think of this like Node’s EventEmitter, except every listener has a well-defined name so it’s easy to remove or replace them.

simple usage

var dispatch = d3.dispatch("statechange");

dispatch.on('statechange', function(e){ console.log(e) })

setTimeout(function(){dispatch.statechange('Hello, world!')}, 3000)

Syntax:

d3.dispatch - create a custom event dispatcher.
dispatch.on - register or unregister an event listener.
dispatch.copy - create a copy of a dispatcher.
dispatch.call - dispatch an event to registered listeners.
dispatch.apply - dispatch an event to registered listeners.

Contributors

Topic Id: 3399

Example Ids: 11696

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