An AngularJS directive for forms that alerts user of unsaved changes.

Dev Note: This module is still in development. However it's used in many of my production projects so it can be considered stable and battle tested.

This directive will alert users when they navigate away from a page where a form has unsaved changes. It will be triggered in all situations where form data would be lost:

when user clicks a link
when user navigates with forward / back button
when user swipes (iOS)
when user refreshes the page

In addition this module:

Works with multiple forms on the same page
Provides a button to disregard unsaved changes
Works with Angular Translate module
Has configurable reload and navigate messages
Works with uiRouter by default by listeneing for $locationChangeStart and $stateChangeStart
Can be configured to listen for any event

How it Works

The directive binds to locationChangeStart and window.onbeforeunload. When these events happen all registered froms are checked if they are dirty. The module defers to the forms $dirty property as a single source of truth. If dirty, the user is alerted. Disregarding changes resets the form and sets pristine.

Basic Usage

Install from bower using $ bower install angular-unsavedChanges --save.
Include the JS, for example <script src="bower_components/angular-unsavedChanges/dist/unsavedChanges.js"></script>.
Include in your app, for example: angular.module('app', ['unsavedChanges', 'anotherDirective'])
Add attribute to your form, unsaved-warning-form
That's it!

API

Directives

The module provides three directives for use.

unsaved-warning-form

Add to forms you want to register with directive. The module will only listen when forms are registered.

<form name="testForm" unsaved-warning-form>
</form>

Optionally, you can add to an element within a form:

<form name="testForm">
	<div unsaved-warning-form>
	</div>
</form>

When used in this way, it must be no more then 3 levels nested within parent form.

unsaved-warning-clear

Add to button or link that will disregard changes, preventing the messaging when user tries to navigate. Note that button type should be reset.

<form name="testForm" unsaved-warning-form>
    <input name="test" type="text" ng-model="test"/>
    <button type="submit"></button>
    <button type="reset" unsaved-warning-clear></button>
</form>

resettable

Add to inputs that use ng-model to reset model values when user dismisses changes or clicks the unsaved-warning-clear button.

<input name="email" ng-model="email" resettable />

Note that if you have multiple forms on the page, only the model values inside the form which was reset will be effected.

On page change or reload, all model values will be effected.

Provider Configuration

A number of options can be configured. The module uses the Object.defineProperty pattern. This avoids the need for custom getters and setters and allows us to treat configuration as pure JS objects.

useTranslateService

Defaults to true. Will use translate service if available. It's safe to leave this set to true, even when not using the translate service, because the module still checks that the service exists.

unsavedWarningsConfigProvider.useTranslateService = true;

logEnabled

Defaults to false. Uses the services internal logging method for debugging.

unsavedWarningsConfigProvider.logEnabled = true;

routeEvent

Defaults to ['$locationChangeStart' ,'$stateChangeStart'] which supports ui router by default.

unsavedWarningsConfigProvider.routeEvent = '$stateChangeStart';

navigateMessage

Set custom message displayed when user navigates. If using translate this will be the key to translate.

unsavedWarningsConfigProvider.navigateMessage = "Custom Navigate Message";

reloadMessage

Set custom message displayed when user refreshes the page. If using translate this will be the key to translate.

unsavedWarningsConfigProvider.reloadMessage = "Custom Reload Message";

Gotchas / Known Bugs

*** Known issue: sometimes the form is removed from expected scope. Ie: in your controller $scope.formName no longer works. You might need to access $scope.$$childTail.formName. This will be fixed in furture versions.

Demo / Dev

To try the demo run npm install && bower install && grunt connect. The browser should open http://127.0.0.1:9001/demo.

Test

Note you need to manually change the paths in index.html and karam-unit.conf to point to the dist version for final testing. Make sure to run $ grunt first.

End 2 End Testing Because of the alert / event driven nature of this module it made the most sense to rely on e2e tests. (also its hard to interact with alerts via unit tests).

To run the e2e tests do the following:

Install Protractor as per directions here: https://github.com/angular/protractor
Start selenium server: webdriver-manager start (or use other selenium methods as per Protractor documentation.)
Run $ grunt test:e2e

Unit Tests

Run $ grunt test:unit OR $ grunt test

Build

Run $ grunt to lint and minify the code. Also strips console logs.

License

The MIT License (MIT)

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.