Announce: sub-atom


CompositeDisposable doesn’t support subscribing to events on DOM elements. Sub-atom is 100% compatible with CompositeDisposable but also supports adding DOM events in one line as simple as using jQuery. The readme follows …

sub-atom package

A replacement for Atom’s CompositeDisposable for easy subscribing to DOM events.

This NPM module is intended only for use in add-on packages for GitHub’s Atom editor. The sub-atom repo is at Feel free to ask questions at the Atom discussion group:

Sub-atom is a wrapper of of Atom’s CompositeDisposable which is an Atom class that collects Disposable objects that enable disposing of event handlers. CompositeDisposable has no provision for handling events on DOM elements. The Atom docs say to do this for each DOM event subscription …

$(window).on 'focus', focusCallback
disposables.add new Disposable ->
  $(window).off 'focus', focusCallback

Obviously this is not acceptable for real-world code. Sub-atom provides the class SubAtom which is 100% compatible with the Atom class CompositeDisposable but can also replace the code above with a single line.


To install sub-atom simply use npm install sub-atom. Then load and initialize the sub-atom module with …

SubAtom = require('sub-atom')
subs = new SubAtom

The subs object has a function add that can be used exactly as CompositeDisposable::add is used. An example …

subs.add editor.onDidChange ->

The same function add can add DOM events with this signature.

subs.add target, events, [selector], handler

target: A DOM element or a jQuery object containing a DOM element…

events: One or more space-separated event types and optional namespaces, such as “click” or “keydown.myPlugin”.

selector: A selector string to filter the descendants of the selected elements that trigger the event. If the selector is null or omitted, then only the target element can trigger the event.

handler: A function to execute when the event is triggered. The value false is also allowed as a shorthand for a function that simply does return false.

The subs object also has a function dispose that disposes all added events. This is identical to the method CompositeDisposable::dispose. Use …



Sub-atom is copyright Mark Hahn with the MIT license.