Tether an element to another element in the DOM
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Ember Tether Build Status Ember Observer Score

This ember-cli addon provides a component that allows for 'tethering' a block to a target somewhere else on the page. The target may be an element, an element selector, or an Ember view. Importantly, the component retains typical context for Ember action handling and data binding.

ember-tether is currently tested in Ember 2.4 and higher. For Ember 1.13 - 2.3, use 0.4.1. For support for earlier versions of Ember, use ember-tether 0.3.1.

Live Demo

View a live demo here: http://yapplabs.github.io/ember-tether/


ember install ember-tether

Note: Ember CLI versions < 0.2.3 should use ember install:addon instead of ember install

Example Usage

Given the following DOM:

<body class="ember-application">
  <div id="a-nice-person">
    Nice person
  <div class="ember-view">
    <!-- rest of your Ember app's DOM... -->

and a template like this:

    targetAttachment='top right'
    attachment='top left'
  A puppy

Then "A puppy" would be rendered alongside the a-nice-person div.

If the ember-tether component is destroyed, its far-off content is destroyed too. For example, given:

{{#if isShowing}}
      targetAttachment='top right'
      attachment='top left'
    A puppy

If isShowing starts off true and becomes false, then the "A puppy" text will be removed from the page.

Similarly, if you use ember-tether in a route's template, it will render its content next to the target element when the route is entered and remove it when the route is exited.

Acceptance Testing

Hubspot Tether works by appending tethered elements to the <body> tag. Unfortunately, this moves your content outside of the Ember application rootElement during acceptance testing. This breaks event dispatch and action handling, including traditional Ember test helpers like click.

As of version 0.4.0, we can configure a different element to be used instead of body. This can be useful for Ember tests.

// config/environment.js

ENV['ember-tether'] = {
  bodyElementId: 'ember-testing'

It is also possible to pass a bodyElement to a particular ember-tether component declaration.



  • git clone <repository-url>
  • cd my-addon
  • npm install `


  • npm run lint:js
  • npm run lint:js -- --fix

Running tests

  • ember test – Runs the test suite on the current Ember version
  • ember test --server – Runs the test suite in "watch mode"
  • ember try:each – Runs the test suite against multiple Ember versions

This addon uses ember-try to test against multiple versions of Ember:

  • ember try:each
  • ember try:one ember-release --- ember test --serve

Running the dummy application

For more information on using ember-cli, visit http://www.ember-cli.com/.

Generating the Changelog

This project uses https://github.com/skywinder/github-changelog-generator to generate its changelog.


  • Hubspot Tether, the underlying library that implement the actual tethering behavior
  • ember-wormhole, whose pattern for element content manipulation inspired the approach in ember-tether
  • Tetherball, for providing countless hours of entertainment over the past century