Usage of vue state management

Usage of Vue state management

Vue.js is an excellent front-end framework. It adopts the MVVM architectural pattern, componentization ideas and responsive data binding to bring developers A lot of conveniences. In Vue.js projects, communication between components is inevitable, and the emergence of Vue state management provides developers with a unified and predictable data state management method, allowing developers to more conveniently Communication and shared state between components.

The core of Vue state management is centralized state management, which can extract the state of components into a global state tree for management, so that our components no longer have their own independent states, but through Shared state in the state tree to achieve data interaction. The emergence of Vue state management can effectively solve the problems of data transfer and state management between components, and improve the maintainability and reusability of the code.

Vuex

In Vue.js, it is officially recommended to use Vuex to implement state management. Vuex is a state management library specially designed for Vue.js. It uses a centralized storage method to manage the state of all components of the application, solving the problem of state sharing between components.

The core concepts of Vuex include: State, Getter, Mutation, Action and Module.

State

State is a core concept in Vuex, which is used to store the state of all components in the application. State is an ordinary JavaScript object that contains all the state of the application. We can access the State in Vuex through this.$store.state, and we can also access the data in the State through computed or mapState in the component.

Getter

Getter is used to derive other states from State, which is equivalent to the calculated properties of State. Getter accepts State as the first parameter and returns a new derived state. The function of Getter is to process and package State. When State changes, Getter will also change accordingly. We can access the Getter through this.$store.getters.

Mutation

Mutation is the only way to modify State. It is similar to an event, but it cannot be called directly, but is triggered by commit. Mutation accepts a State as the first parameter and a MutationPayload as the second parameter. Certain rules must be followed when modifying State in Mutation: Only Mutation can be used to modify State, and Mutation cannot contain asynchronous operations. We can submit Mutation through this.$store.commit.

Action

Action can be seen as a further encapsulation of Mutation. It is used to handle asynchronous operations and can contain any asynchronous operations. Action accepts a context object with the same methods as the Store instance as the first parameter, and context consists of State, Getter, Mutation and Action. The Mutation is finally submitted in the Action to modify the State. We can trigger Action through this.$store.dispatch.

Module

The function of Module is to split the Store into different modules. Each module has its own State, Getter, Mutation, Action and Module, and each manages its own state independently. Module can make the code structure clearer and easier to maintain. We can define Module through the modules option of Vuex.Store. In Module, State, Getter, Mutation and Action are defined similarly to Store.

Summary

The core of Vue state management is centralized state management, which can conveniently and uniformly manage the state of components and solve the problem of state sharing between components. Vuex is the state management library officially recommended by Vue.js. It provides a complete state management solution through the five core concepts of State, Getter, Mutation, Action and Module. In actual development, we need to choose an appropriate state management method based on business needs and comply with specific development specifications to ensure the maintainability and reusability of the application.

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