Why does socket need to be refreshed in vue?

Vue.js is one of the more popular frameworks in front-end development. Its features of realizing data responsiveness and componentization are widely used in web development. Another very common web development technology is Socket, which is mainly used in real-time communication scenarios between servers and clients.

Vue.js can simplify the use of Socket by using plug-ins such as vue-socket.io, and combine it with the data responsiveness in Vue to achieve real-time data updates. However, when using Socket, we often need to pay attention to a question: Why do we need to manually refresh the view when using Socket in Vue? This article will answer this question.

First of all, we need to understand how data responsiveness is implemented in Vue. When we modify the responsive data in the Vue instance, Vue will monitor and update the data through getters and setters. Vue automatically re-renders component views when responsive data is updated. This process is automatic and does not require manual triggering.

However, when using Socket, data updates are pushed to the client by the server, so the responsive data in the Vue instance is not directly modified. In order for Vue to be aware of data updates, we need to manually trigger view updates. Although plug-ins such as vue-socket.io have helped us realize data monitoring and transmission at the bottom level, after the data is updated, we still need to manually refresh the view to let Vue display the latest data.

In Vue, manually refreshing the view can be achieved using the $forceUpdate method. This method can force a re-rendering of component views, including views of child components. Therefore, when we use Socket for real-time communication, we can call the $forceUpdate method in the Socket callback function to immediately update the view. The sample code is as follows:

// 在组件中使用 socket
import io from 'socket.io-client'
export default {
  // ... 组件其他代码
  created () {
    // 初始化 socket
    const socket = io('http://localhost:3000')
    // 监听数据更新事件
    socket.on('data', (data) => {
      this.data = data
      // 手动刷新视图
      this.$forceUpdate()
    })
  }
}

It should be noted that since forced refresh of the view consumes a certain amount of performance, you should try to avoid frequent manual refresh of the view when using Socket. In addition, we can also use Vue's calculated properties or variables inside components to achieve similar effects to avoid refreshing the view too frequently.

To summarize, when using Socket to implement real-time communication in Vue, you need to manually refresh the view to display the latest data. This is because data updates are pushed to the client by the server, rather than directly modifying the responsive data in the Vue instance. Here we introduce how to manually refresh the view in Vue, and also remind everyone that you need to pay attention to performance issues when using Socket. I hope this article can help readers better understand the combination of Vue and Socket technology.

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