Chapter 4 User InterfaCe DesIgn Figure 4-4. MVC architecture • Portlets should be independent of each other, as per digital experience platform business requirement. Angular framework or React library along with Flux library makes a lean-structured presentation layer. Presentation components should be of high quality and should be well tested. Quality is achieved thoroughly and efficiently by testing presentation components using a test-driven approach. Therefore, framework and libraries like Karma, Jasmine, Mocha, Chai, etc., help to achieve high quality. Communication Between Presentation Components Sometimes it is vital that one presentation component responds to an action made in another presentation component. For example, after a user has selected a different account from the account list component, the transaction list is updated to show transactions related to that particular selected account in the transaction list component, as shown in Figure 4-5. If presentation components are on the same page, this can be 126