Managing State & HTTP Requests In Ionic.

Ionic is a complete open-source SDK for hybrid mobile app development created by Max Lynch, Ben Sperry, and Adam Bradley of Drifty Co. in 2013.The original version was released in 2013 and built on top of AngularJS and Apache Cordova. However, the latest release was re-built as a set of Web Components using StencilJS, allowing the user to choose any user interface framework, such as Angular, React or Vue.js. It also allows the use of Ionic components with no user interface framework at all.[4] Ionic provides tools and services for developing hybrid mobile, desktop, and progressive web apps based on modern web development technologies and practices, using Web technologies like CSS, HTML5, and Sass. In particular, mobile apps can be built with these Web technologies and then distributed through native app stores to be installed on devices by utilizing Cordova or Capacitor.

1. Managing State & HTTP requests in Ionic Devansh Kapoor & Anuj Tomar

2. Lack of etiquette and manners is a huge turn off.   KnolX Etiquettes Punctuality Join the session 5 minutes prior to the session start time. We start on time and conclude on time! Feedback Make sure to submit a constructive feedback for all sessions as it is very helpful for the presenter. Silent Mode Keep your mobile devices in silent mode, feel free to move out of session in case you need to attend an urgent call. Avoid Disturbance Avoid unwanted chit chat during the session.

3. What is State? State management using Rxjs  subject How ionic app connects to server HTTP requests & reponses in Ionic Demo

4. What is State ?

5. What is State? Unlike backend applications, which use databases for state management, frontend applications need some sort of mechanism for handling data. This data can range from server responses gotten from HTTP request, to form input data and user routes. It’s a good practice to compose all your application state in a central store for easy management and data communication. So, basically, our state is a representation of our application that actually lives in the store.

6. What is State? State UI State Local State Persistent State List of all events List of loaded events We are loading something Managed inside of the components Managed inside of services Managed on backend server/database

7. State management using Rxjs Subject RxJS Subject facilitates a reactive approach to state management by acting as a centralized event bus. It allows multiple components to subscribe to state changes, ensuring real-time updates across the application. Implementing state management with RxJS Subject involves creating a dedicated service where a Subject instance is initialized. This Subject serves as a conduit for emitting and subscribing to state changes. Ionic components can consume this state management service by injecting it via Angular's dependency injection mechanism. Components subscribe to the data$ Observable in their ngOnInit () lifecycle hook to receive and react to state updates.

8. Implementing State Management with  RxJS  Creating the state store Start by defining a central store using RxJS’s BehaviorSubject or  Subject.  Defining actions Actions represent the events or user interactions that trigger state changes Handling state updates Use RxJS operators like map, scan, take and merge to handle state updates. Subscribing to state changes  Optimizing performance

9. Advantages of using  RxJS  Subject Centralized State Management: RxJS Subject promotes centralized state management, reducing redundancy and ensuring consistency across components. Reactive Updates: Components react in real-time to changes in state, enhancing responsiveness and user interaction. Simplified Data Flow: The use of Observables and reactive programming principles simplifies data flow and enhances the predictability of state changes.

10. Best Practices of using  RxJS  Subject Error Handling: Implement robust error handling within Observables to gracefully manage failures and enhance user experience. Performance Optimization: Use RxJS operators like debounceTime and distinctUntilChanged to optimize state updates and prevent unnecessary renders. Testing: Write unit tests to validate the behavior of state management services and components, ensuring reliability and stability.

11. Ionic App connecting to the server 02

12. How ionic app connect to server ? Can be custom backend or service like firebase Server [REST API] Database ( SQL/ NoSQL ) Ionic App Directly accessing the database will be highly insecure Send request & receive response Store & fetch data

13. HTTP requests & responses 03

14. HTTP requests & responses Importance of HTTP Requests Data Fetching: Essential for retrieving data from external APIs or backend servers. Data Submission: Used for sending data, such as form submissions, to a server for processing. Asynchronous Operations: Handles operations asynchronously, ensuring the UI remains responsive.

15. Angular HttpClient Setup and Configuration: Angular's HttpClient module needs to be imported and configured in the app module. It provides a simplified API for making HTTP requests. Making Requests: Supports various HTTP methods such as GET, POST, PUT, DELETE. The HttpClient returns Observables, making it easy to handle asynchronous data streams. Error Handling: Use RxJS operators like catchError to manage errors gracefully and provide user feedback.

16. Ionic Native HTTP Native Capabilities: The Ionic Native HTTP plugin offers enhanced performance and handles CORS issues for mobile applications. It is particularly useful for native builds (iOS and Android). Setup and Usage: The plugin needs to be installed and configured. It provides methods like get, post, put, and delete similar to HttpClient but with native capabilities. Security and Performance: Utilizes native capabilities for secure data transmission and better performance in handling requests.

17. Best Practices Error Handling: Implement comprehensive error handling to manage network errors, server failures, and invalid responses. Loading Indicators: Display loading indicators while waiting for HTTP responses to enhance user experience. Data Caching: Use caching strategies to store frequently accessed data locally, reducing the need for repeated network requests. Security Considerations: Always use HTTPS to ensure data security during transmission. Validate and sanitize inputs and outputs to prevent security vulnerabilities.

18. DEMO