ngRx Store in Angular
Before I start, a small backstory. So, a few weeks back, there was a requirement in an angular project I was working on, wherein I had to keep a piece of data intact so that several other components could use it. My React instinct suggested me of using some angular version of context API which led me to 3 Angular ways of managing states and keeping data intact.
Component State: For Simple applications or components with minimal shared data, we can manage state within individual components using Angular's component properties and event binding. This was clearly out of league because I needed to share data across multiple components.
Service Based State Management: Services can be used to create centralized state management solutions. But performance and scalability of the application will take a hit following this approach.
ngRx Store: ngRx store provides centralized state management capabilities. NGRX uses RxJS observables and actions to manage state.
Out of the three ngRx Store seemed to be the most suitable one to go with.
Implementing ngRx Store:
To better understand the implementation of ngRx, we first need to understand how ngRx works in the first place.
The flow starts from the component. The good thing about ngRx is our component doesn't need to know how to manage the state. Only thing it is concerned about is dispatching an action to inform something happened (an event) like the user clicked on the delete button.
At this point the reducer comes into play. Reducer is responsible for determining how a particular action should modify state. Usually we have reducer for every entity we want to manage state for. So, Reducer detect all the action being dispatched in the app and determine how the state should be modified and once modified, stores the updated state in the ngRx Store (which is a global store for all the states across the application).
Finally, when a component wants to access the store, the component uses a selector to pull in the state that it needs from the store.
Now let's get our (actually my) hands dirty and implement a store for a Todo application.
Step 1: Creating action
Inside the createAction method, we are passing two parameters - a unique string that will be used to distinguish an action, another is the payload we want to send (optional).
Step 2: Creating Reducers
In the reducer, we pass the initial state and the task to perform on dispatching a particular action.
Step 3: Dispatching Action
We dispatch an action by calling the dispatch method of the store passing the action to it.
Step 4: Creating selector
AppState refers to the central store for the whole application from which we selecting the todo state. Now we can start consuming the store data like I did in the Dispatching Actions code's line no. 11.
Finally, we need to add the todoReducer in our imports of the App Module so that it is available across the application.
Conclusion
In this blog, I summarized and explained the ngRx store in details, how it works and how can we implement it in our application. ngRx store can be very useful as the application grows, to store data and access it across different components. Hope it helped ;)
The above is the detailed content of ngRx Store in Angular. For more information, please follow other related articles on the PHP Chinese website!

Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Article

Hot Tools

Notepad++7.3.1
Easy-to-use and free code editor

SublimeText3 Chinese version
Chinese version, very easy to use

Zend Studio 13.0.1
Powerful PHP integrated development environment

Dreamweaver CS6
Visual web development tools

SublimeText3 Mac version
God-level code editing software (SublimeText3)

Hot Topics











JavaScript is the cornerstone of modern web development, and its main functions include event-driven programming, dynamic content generation and asynchronous programming. 1) Event-driven programming allows web pages to change dynamically according to user operations. 2) Dynamic content generation allows page content to be adjusted according to conditions. 3) Asynchronous programming ensures that the user interface is not blocked. JavaScript is widely used in web interaction, single-page application and server-side development, greatly improving the flexibility of user experience and cross-platform development.

The latest trends in JavaScript include the rise of TypeScript, the popularity of modern frameworks and libraries, and the application of WebAssembly. Future prospects cover more powerful type systems, the development of server-side JavaScript, the expansion of artificial intelligence and machine learning, and the potential of IoT and edge computing.

Different JavaScript engines have different effects when parsing and executing JavaScript code, because the implementation principles and optimization strategies of each engine differ. 1. Lexical analysis: convert source code into lexical unit. 2. Grammar analysis: Generate an abstract syntax tree. 3. Optimization and compilation: Generate machine code through the JIT compiler. 4. Execute: Run the machine code. V8 engine optimizes through instant compilation and hidden class, SpiderMonkey uses a type inference system, resulting in different performance performance on the same code.

JavaScript is the core language of modern web development and is widely used for its diversity and flexibility. 1) Front-end development: build dynamic web pages and single-page applications through DOM operations and modern frameworks (such as React, Vue.js, Angular). 2) Server-side development: Node.js uses a non-blocking I/O model to handle high concurrency and real-time applications. 3) Mobile and desktop application development: cross-platform development is realized through ReactNative and Electron to improve development efficiency.

Python is more suitable for beginners, with a smooth learning curve and concise syntax; JavaScript is suitable for front-end development, with a steep learning curve and flexible syntax. 1. Python syntax is intuitive and suitable for data science and back-end development. 2. JavaScript is flexible and widely used in front-end and server-side programming.

This article demonstrates frontend integration with a backend secured by Permit, building a functional EdTech SaaS application using Next.js. The frontend fetches user permissions to control UI visibility and ensures API requests adhere to role-base

The shift from C/C to JavaScript requires adapting to dynamic typing, garbage collection and asynchronous programming. 1) C/C is a statically typed language that requires manual memory management, while JavaScript is dynamically typed and garbage collection is automatically processed. 2) C/C needs to be compiled into machine code, while JavaScript is an interpreted language. 3) JavaScript introduces concepts such as closures, prototype chains and Promise, which enhances flexibility and asynchronous programming capabilities.

JavaScript does not require installation because it is already built into modern browsers. You just need a text editor and a browser to get started. 1) In the browser environment, run it by embedding the HTML file through tags. 2) In the Node.js environment, after downloading and installing Node.js, run the JavaScript file through the command line.
