ng-idle-core
v8.0.0-beta.7
Published
A module for detecting and responding to the user becoming idle in Angular applications.
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Introduction
A module for responding to idle users in Angular applications. This is a rewrite of the ng-idle module; however if you are using Angular 1, you must use that module.
MAINTAINERS WANTED
The Angular community needs you! I'm looking for a new developer or team to take over maintenance of this module. These are the responsibilities any interested candidates should consider:
- Now: Complete beta process (major remaining item is to make it compatible with SSR)
- Now: Update demo and add API documentation
- Ongoing: Bug fixes
- Ongoing: New releases for new versions of Angular
- Later: Refactor to simplify API and reduce package size
- Later: Add support for non-browser environments?
Ideally, a candidate:
- Has experience building applications in Angular 5+
- Is an active Angular developer and tuned into the Angular release schedule
- Loves open source and the Angular community
- Is committed to releasing modular and lightweight (as possible) packages
- Has working understanding of DOM events, JavaScript timers and intervals, Web Storage API, and cookies
- Understands testing using Karma and Jasmine, and is committed to a high percentage of code coverage
- Has working understanding of the contributing guide, is willing to accept contributions from others, and can use Github and related tools effectively
- Has time to triage and answer tickets, or delegate to others
- Has basic understanding of NPM for releasing packages
Please get in touch if you are interested!
License
Authored by Mike Grabski @HackedByChinese [email protected]
See LICENSE for licensing details.
Demo
Visit https://hackedbychinese.github.io/ng2-idle to view a simple example with quick start instructions.
Quick start
@ng-idle
is shipped via npm. You can install the package using the following command for the latest supported version of Angular:
npm install --save ng-idle-core
Integrating and configuring the package into your application requires a few more steps. Please visit @ng-idle-example for source and instructions on how to get going.
Design Considerations
The primary application of this module is to detect when users are idle. It can also be used to warn users of an impending timeout, and then time them out. The core of this module is the Idle
service which does its best - based on your configuration - to detect when a user is active or idle and pass that information on to your application so it can respond appropriately.
Modularization
The core functionality can be found in the ng-idle-core
package via npm.
Additional modules to extend functionality:
ng-idle-keepalive
(see below)
Extensible Keepalive Integration
In a common use case where it is used for session management, you may need to signal to the server periodically that the user is still logged in and active. If you need that functionality, @ng-idle
can optionally integrate with ng-idle-keepalive
. @ng-idle
will instruct ng-idle-keepalive
to ping while the user is active, and stop once they go idle or time out. When the user resumes activity or the idle state is reset, it will ping immediately and then resume pinging. Please note that keepalive integration is optional, and you must install and configure ng-idle-keepalive
separately to get this functionality. You can implement your own by extending KeepaliveSvc
and configuring it as a provider in your application for the KeepaliveSvc
class.
Extensible Interrupts
An interrupt is any source of input (typically from the user, but could be things like other tabs or an event) that can be used to signal to Idle
that the idle watch should be interrupted or reset. Unlike ng-idle
, these sources are not hardcoded; you can extend InterruptSource
or any of the built-in sources to suit your purposes. This feature is also useful to handle input noise that may plague your particular use case. It can also be used to target specific elements on a page rather than the whole document or window. The following sources come built into this package:
InterruptSource
(abstract): A base type you can implement to make your own source.EventTargetInterruptSource
: Any object that implementsEventTarget
, such as anHTMLElement
orWindow
. Takes in the object that is the source and a space delimited string containing the events that cause an interrupt.DocumentInterruptSource
: Looks for events (in a space delimited string) that bubble up to thedocument.documentElement
(html
node).WindowInterruptSource
: Looks for events (in a space delimited string) that bubble up to theWindow
.StorageInterruptSource
: Looks only for theStorage
event ofWindow
object. Obligatory forLocalStorageExpiry
.
NOTE: You must configure source(s) yourself when you initialize the application. By default, no interrupts are configured. You can use a configuration analogous to the ng-idle
default by importing DEFAULT_INTERRUPTSOURCES
and passing that reference to Idle.setInterrupts(DEFAULT_INTERRUPTSOURCES);
.
Extensible Expiry
Another feature ported from ng-idle
is the ability to store an expiry value in some store where multiple tabs or windows running the same application can write to. Commonly, this store is the localStorage
, but could be cookies or whatever you want. The purpose of this expiry and the expiry store is twofold: First, to prevent a window from not timing out if it sleeps or pauses longer than the configured timeout period. Second, it can be used so that activity in one tab or window prevents other tabs or windows in the same application from timing out.
By default, a LocalStorageExpiry
type is provided, which will just keep track of the expiry in the localStorage. It will fulfill all purposes mentioned above. If you don't want to support multiple tabs or windows, you can use SimpleExpiry
. In other words, SimpleExpiry
does not coordinate last activity between tabs or windows. If you want to store the expiry value in another store, like cookies, you'll need to use or create an implementation that supports that. You can create your own by extending IdleExpiry
or SimpleExpiry
and configuring it as a provider for the IdleExpiry
class.
Multiple Idle Instance Support
The dependency injector in Angular supports a hierarchical injection strategy. This allows you to create an instance of Idle
at whatever scope you need, and there can be more than one instance. This allows you two have two separate watches, for example, on two different elements on the page.
If you use the default expiry (LocalStorageExpiry
), you will need to define a name for each idle with Idle.setIdleName('yourIdleName')
, otherwise the same key will be used in the localStorage and this feature will not work as expected.
Example Use Case
For example, consider an email application. For increased security, the application may wish to determine when the user is inactive and log them out, giving them a chance to extend their session if they are still at the computer and just got distracted. Additionally, for even better security the server may issue the user's session a security token that expires after 5 minutes of inactivity. The user may take much more time than that to type out their email and send it. It would be frustrating to find you are logged out when you were actively using the software!
ng-idle-core
can detect that the user is clicking, typing, touching, scrolling, etc. and know that the user is still active. It can work with ng-idle-keepalive
to ping the server every few minutes to keep them logged in. In this case, as long as the user is doing something, they stay logged in. If they step away from the computer, we can present a warning dialog, and then after a countdown, log them out.
Developing
This project was developed using the NodeJS version found in the .nvmrc
file. You may experience problems using older versions. Try NVM or similar to manage different versions of Node concurrently. If using NVM, you can execute nvm install
to download and switch to the correct version.
Once you have cloned the repository, install all packages using npm
:
npm install
You can now build and run all tests once with coverage.
npm test
You can also continuously run tests while you make changes to a project by executing npm run ng test <project name>
or ng test <project name>
if you have @angular/cli
installed globally.
npm run ng test core
...
npm run ng test keepalive
Note: Keepalive depends on Core. If you are running the above continuous tests, you'll need to npm build
or npm run ng build core
first and after making changes to Core. However, npm test
will build all modules and run the tests in one shot.
Contributing
See the contributing guide.