Real-time Communication using Socket.IO 3.x and Angular 11.x

Build a real-time online pizza order app with socket.io and a MongoDB server, using results and pizza orders collections to display live status and counts.

Explore MongoDB as a scalable, document-oriented database with community servers and cloud options. Create databases and collections, insert documents, and leverage indexing and real-time aggregation in a distributed database system.

Learn to write MongoDB queries using the mongo shell: create databases and collections, insert multiple documents, and fetch data with find and findOne, using pretty for readable output.

Create a pizza order socket.io app using Express and Socket.IO. Establish a Baeza namespace, connect to MongoDB, fetch all documents from the exults collection, and emit them to clients.

Build a real-time socket.io pizza orders app by writing an aggregate group-by query on the pizza orders collection and broadcasting counts to the orders room in the pizza namespace.

Create an Angular 9.x pizza order application by creating a new Angular app, installing socket.io client, and building a pizza module with a service and models.

write the service logic to connect to the socket io server, import models, and create observables that listen for bizarre list and example orders, then emit new pizza order events.

Add an Angular component integrated with a Socket.IO service, fetch documents via an observable, and display them in a table with images and currency formatting.

Place an order for the selected pizza and display a live count of orders from customers in a separate table. Use an observable, subscribe, and submit orders via the service.

Test the real-time output of the angular app against a socket server on port 90902, ordering pizza via the order now button, updating counts across two browser instances.

Discover a real-time update challenge in an app used by multiple clients, where order counts fail to refresh across mobile and other apps until a manual refresh.

Migrate the pizza order service from socket.io 2.x to 3.x by updating package.json and configuring cors options with origin and methods, then run the server and ignore the known warning.

Migrate the pizza order ui from socket.io 2.x to 3.x in an angular 11 app, update the client package and services, and adopt new observable syntax to verify real-time updates.

Explore data synchronization with MongoDB change streams, watching a collection to push updates to socket IO dashboard, while a customer app updates data via REST API using replica set.

Discover how to set up a MongoDB replica set, initialize it, create a new database, and add two collections—Engy Questions and Angular Roots—and insert documents into the Energy Questions collection.

Create a rest API with Node.js and Express.js to fetch data from the energy questions collection, send it to a customer app, and store results in the Angular Works collection.

Develop the REST API data access layer by connecting to MongoDB via the mortgages connector, implementing a class with get all Angular questions and insert into Angular collections using promises.

Configure two routes in an Express router to fetch all Angular questions and post votes, using a data access layer and middleware.

Create a client front end using Angular, enable routing, choose the default css, and integrate Bootswatch Bootstrap styles for the end user voting app.

Build a Ward module in angular app by adding a module, service, two components, and two models to fetch questions and voting data, following the folder structure.

Write the service logic by configuring the http client, injecting it into a world service, and connecting to rest endpoints to fetch questions via an observable and post world data.

Build an angular 11 component that loads questions via a service, displays them with radio options in a form, submits a vote object, and navigates to a thank-you page.

Explore the single page application structure with a home component and a navigation menu, using lazy loading, routes, and a router outlet to load modules.

Configure two routes in the routing module and enable lazy loading with loadChildren, updating the app routing module; then wire the navigation router link to the feature path.

Create a socket.io server with express to stream real-time vote aggregates from MongoDB change streams and push updates to the Angular client for display with high charts.

Build an express and socket.io app that runs an aggregate query on the angular warts collection, grouping by technology name and emitting results to the dashboard namespace, with change streams.

Create an in-house client dashboard UI with Angular 9.x to visualize the Angular votes and aggregate data. Install socket.io client, highcharts, and highcharts-angular, and run the app on port 3000.

Create a dashboard module inside the dashboard folder, then add a dashboard service and a dashboard component.

Write the dashboard service logic to connect to the socket IO client, expose an observable of aggregate data received from server events, and handle error events.

Explore the single-page application code for the client dashboard, including the home module, dashboard home component, navigation module, dashboard menu component, bootstrap menu, and the router outlet in Angular routing.

Explore integrating the Highcharts library with an Angular application using the Highcharts Angular wrapper, configuring the options to render bar, line, or area charts.

Visualize real-time Angular vote data using a Highcharts column chart in the dashboard, pulling average votes from the dashboard service via sockets and updating the chart when new data arrives.

Configure the dashboard route and implement lazy loading in an Angular 11.x app by creating a dashboard routing module and wiring a router link in the navigation menu.

Test and visualize real-time dashboard updates using socket.io and angular 11.x, switch chart types, set chart width to 100%, and display KPI chart with colored lines.

Perform a migration of real-time applications from Socket.IO to 3.x using Angular 11.x across voting, dashboard, and client UI, including CORS setup and client-server integration.

Explore real-time communication with socket.io, covering server and client APIs, namespaces, and rooms for live updates across customer facing and organization apps.