An addon to conditionally prompt the user when transitioning between routes or closing the browser.

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An add-on to conditionally prompt the user when transitioning between routes or closing the browser.


This library is tested against Ember 1.13.x and Ember 2.x.
ember install ember-onbeforeunload


To get started, mix the ConfirmationMixin into your Ember.Route. By default, the user will be prompted beforeunload any time the model for the route hasDirtyAttributes (docs).
// app/routes/foo.js
import Ember from 'ember';
import ConfirmationMixin from 'ember-onbeforeunload/mixins/confirmation';

export default Ember.Route.extend(ConfirmationMixin, { });


This addon tries to provide sane defaults, but it also exposes all of the internals for customization.

Confirmation Message

You can customize the message displayed in the confirmation dialog by overriding the confirmationMessage property. You can either pass a hard-coded string, or use a function.
export default Ember.Route.extend(ConfirmationMixin, {
  confirmationMessage: 'Are you sure?',

export default Ember.Route.extend(ConfirmationMixin, {
  confirmationMessage(model) {
    return `Are you sure you want to unload ${model.name}?`;

export default Ember.Route.extend(ConfirmationMixin, {
  i18n: service(), // see ember-i18n
  confirmationMessage() {
    return this.get('i18n').t('myTranslation');

isPageDirty logic

If you do not sure Ember Data, or you have other logic to determine whether or not the page is dirty, you can override the isPageDirty method.
export default Ember.Route.extend(ConfirmationMixin, {
  isPageDirty(/* model */) {
    const isDirty = true; // your logic here
    return isDirty;

Allow Dirty Transitions

By default, we allow navigating within the hierarchy of route you mix the ConfirmationMixin into. For example, navigating from myroute.index to myroute.index.subroute would not check isPageDirty. If you have other logic that determines when a dirty transition should be allowed, you can override shouldCheckIsPageDirty.
export default Ember.Route.extend(ConfirmationMixin, {
  shouldCheckIsPageDirty(transition) {
    const isChildRouteTransition = this._super(...arguments);

    if (transition.targetName === 'some-exempt-route') {
      return true;
    } else {
      return isChildRouteTransition;

onUnload logic

If you have some custom logic you'd like to execute when your route is unloaded, you can tie into the onUnload function. By default, this function is a no-op.
export default Ember.Route.extend(ConfirmationMixin, {
  onUnload() {
    // my custom unload logic
This library underwent major API changes with version 1.0.0. For information on how to upgrade, please check out UPGRADING.md.
Found a bug? Please report it!
Development Instructions


  • git clone this repository
  • npm install
  • bower 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"
  • npm test – Runs ember try:each to test your addon against multiple Ember versions

Running the dummy application

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