Alertify (github) is small library for presenting beautiful dialog windows and notifications. It is easy to customize with CSS, has a simple API and doesn’t depend on third party libraries (but plays nicely with them). To use it, include the js file and call the methods of the global alertify object:
Features
Customizable look and feel : If you can edit CSS you can customize the look of alertify.js to match your needs
Lightweight, no dependencies : No matter the type of project, if JavaScript is available alertify.js can be used
Growl-like notification : Unobtrusive notification messages can be used to give feedback to users or even as a console.log replacement
Cross-browser and platform : Whether you use a desktop, laptop, tablet or mobile device, alertify.js has you covered
