nebula-checked-behavior | Vaadin

A Polymer behavior to support checkbox and radio control capabilities.

[ This description is mirrored from at on 2019-05-22 ]

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A Polymer ES2015 class extension mixin to support a checked state.

  • Adds a checked and value property to a custom element
  • Processes keyboard, mouse and touch gestures to update checked state and trigger standard events
  • Supports WAI-ARIA authoring practices for a11y


$ bower install -S arsnebula/nebula-checked-behavior

Getting Started

Import the package.

<link rel="import" href="/bower_components/nebula-checked-behavior/nebula-checked-behavior.html">

Use the class mixin factory to extend an element.

class DemoElement extends Nebula.CheckedBehavior(Polymer.Element) {
  static get is() { return 'demo-element' }
customElements.define(, DemoElement)

Style the element based on the checked attribute.

:host([checked]) {
  background-color: green;

For more information see the API Reference documentation.


We welcome and appreciate feedback from the community. Here are a few ways that you can show your appreciation for this package:

  • Give us a Star on GitHub from either or directly on GitHub.

  • Submit a feature request, or a defect report on the Issues List.

  • Become a Patreon. It takes a lot of time and effort to develop, document, test and support the elements in our Nebula Essentials collection. Your financial contribution will help ensure that our entire collection continues to grow and improve.

If you are a developer, and are interested in making a code contribution, consider opening an issue first to describe the change, and discuss with the core repository maintainers. Once you are ready, prepare a pull request:

  1. Fork it!
  2. Create your feature branch: git checkout -b my-new-feature
  3. Commit your changes: git commit -am 'Add some feature'
  4. Push to the branch: git push origin my-new-feature
  5. Submit a pull request :D

Change Log





Link to this version
ImportedReleased 16 April 2017ISC License
Framework Support
Polymer 1.0+
Polymer 2.0+
Browser Independent
Install with
bower install --save arsnebula/nebula-checked-behavior"#2.0.0"
Run the above Bower command in your project folder. If you have any issues installing, please contact the author.
Release notes - Version 2.0.0


  • polymer#Polymer/polymer#>=2.0.0-rc.1 <3.0
  • nebula-element-mixin#arsnebula/nebula-element-mixin#^2.0.0