search
HomeWeb Front-endFront-end Q&AWhat is Vue's two-way binding subscriber?

In Vue.js, two-way data binding is one of its most important and distinctive features. The core technologies for implementing two-way data binding are dependency tracking and publish/subscribe patterns. In Vue.js, an object called Watcher plays a very important role. Its role is to notify the view layer of data changes and ensure the synchronization of data and views.

However, Watcher itself is not an independent entity, but is created in Dep (that is, the subscriber). The relationship between them is like the observers and topics in the publish/subscriber pattern.

So, what does each of them mean?

Watcher: Observer is responsible for subscribing to data changes. Once the data changes, it triggers an update operation and notifies the view layer to re-render.

Dep: Topic, data center, responsible for managing all Watchers and notifying Watchers to update when data changes.

Remember the data binding we used in Vue.js?

<template>
  <div>
    <input>
    <h2 id="message">{{ message }}</h2>
  </div>
</template>
<script>
  export default {
    data () {
      return {
        message: &#39;Hello Vue!&#39;
      }
    }
  }
</script>

In this example, we bind the data message to the <input> element, and also bind it synchronously to the element. This is how Vue.js two-way binding is used.

When we run this application, Vue.js starts to perform template compilation, analyzes the instructions in the template, and establishes a relationship diagram between DOM nodes and Watcher.

In other words, create a Watcher object on the <input> element, which will listen to message data changes and immediately update to the view layer.

In this process, the role of the Dep subscriber is reflected. When message data changes, it will notify all Watcher objects to perform update operations and let them re-render the view.

In general, the Dep subscriber is a very important part of the Vue.js framework. It works closely with the Watcher object to complete the core technology of two-way data binding in Vue.js.

The above is the detailed content of What is Vue's two-way binding subscriber?. For more information, please follow other related articles on the PHP Chinese website!

Statement
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
The Size of React's Ecosystem: Navigating a Complex LandscapeThe Size of React's Ecosystem: Navigating a Complex LandscapeApr 28, 2025 am 12:21 AM

TonavigateReact'scomplexecosystemeffectively,understandthetoolsandlibraries,recognizetheirstrengthsandweaknesses,andintegratethemtoenhancedevelopment.StartwithcoreReactconceptsanduseState,thengraduallyintroducemorecomplexsolutionslikeReduxorMobXasnee

How React Uses Keys to Identify List Items EfficientlyHow React Uses Keys to Identify List Items EfficientlyApr 28, 2025 am 12:20 AM

Reactuseskeystoefficientlyidentifylistitemsbyprovidingastableidentitytoeachelement.1)KeysallowReacttotrackchangesinlistswithoutre-renderingtheentirelist.2)Chooseuniqueandstablekeys,avoidingarrayindices.3)Correctkeyusagesignificantlyimprovesperformanc

Debugging Key-Related Issues in React: Identifying and Resolving ProblemsDebugging Key-Related Issues in React: Identifying and Resolving ProblemsApr 28, 2025 am 12:17 AM

KeysinReactarecrucialforoptimizingtherenderingprocessandmanagingdynamiclistseffectively.Tospotandfixkey-relatedissues:1)Adduniquekeystolistitemstoavoidwarningsandperformanceissues,2)Useuniqueidentifiersfromdatainsteadofindicesforstablekeys,3)Ensureke

React's One-Way Data Binding: Ensuring Predictable Data FlowReact's One-Way Data Binding: Ensuring Predictable Data FlowApr 28, 2025 am 12:05 AM

React's one-way data binding ensures that data flows from the parent component to the child component. 1) The data flows to a single, and the changes in the state of the parent component can be passed to the child component, but the child component cannot directly affect the state of the parent component. 2) This method improves the predictability of data flows and simplifies debugging and testing. 3) By using controlled components and context, user interaction and inter-component communication can be handled while maintaining a one-way data stream.

Best Practices for Choosing and Managing Keys in React ComponentsBest Practices for Choosing and Managing Keys in React ComponentsApr 28, 2025 am 12:01 AM

KeysinReactarecrucialforefficientDOMupdatesandreconciliation.1)Choosestable,unique,andmeaningfulkeys,likeitemIDs.2)Fornestedlists,useuniquekeysateachlevel.3)Avoidusingarrayindicesorgeneratingkeysdynamicallytopreventperformanceissues.

Optimizing Performance with useState() in React ApplicationsOptimizing Performance with useState() in React ApplicationsApr 27, 2025 am 12:22 AM

useState()iscrucialforoptimizingReactappperformanceduetoitsimpactonre-rendersandupdates.Tooptimize:1)UseuseCallbacktomemoizefunctionsandpreventunnecessaryre-renders.2)EmployuseMemoforcachingexpensivecomputations.3)Breakstateintosmallervariablesformor

Sharing State Between Components Using Context and useState()Sharing State Between Components Using Context and useState()Apr 27, 2025 am 12:19 AM

Use Context and useState to share states because they simplify state management in large React applications. 1) Reduce propdrilling, 2) The code is clearer, 3) It is easier to manage global state. However, pay attention to performance overhead and debugging complexity. The rational use of Context and optimization technology can improve the efficiency and maintainability of the application.

The Impact of Incorrect Keys on React's Virtual DOM UpdatesThe Impact of Incorrect Keys on React's Virtual DOM UpdatesApr 27, 2025 am 12:19 AM

Using incorrect keys can cause performance issues and unexpected behavior in React applications. 1) The key is a unique identifier of the list item, helping React update the virtual DOM efficiently. 2) Using the same or non-unique key will cause list items to be reordered and component states to be lost. 3) Using stable and unique identifiers as keys can optimize performance and avoid full re-rendering. 4) Use tools such as ESLint to verify the correctness of the key. Proper use of keys ensures efficient and reliable React applications.

See all articles

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

Video Face Swap

Video Face Swap

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

Hot Tools

MantisBT

MantisBT

Mantis is an easy-to-deploy web-based defect tracking tool designed to aid in product defect tracking. It requires PHP, MySQL and a web server. Check out our demo and hosting services.

Atom editor mac version download

Atom editor mac version download

The most popular open source editor

VSCode Windows 64-bit Download

VSCode Windows 64-bit Download

A free and powerful IDE editor launched by Microsoft

Notepad++7.3.1

Notepad++7.3.1

Easy-to-use and free code editor

EditPlus Chinese cracked version

EditPlus Chinese cracked version

Small size, syntax highlighting, does not support code prompt function