Detailed explanation of vue components and reuse
This time I will bring you a detailed explanation of the use of vue components and reuse. What are the precautions for the use of vue components and reuse? The following is a practical case, let's take a look.
1. What is a component
Component (Component) is one of the most powerful features of Vue.js. Components can extend HTML elements, encapsulating reusable code.
2. Component usage
Components need to be registered before they can be used. There are two ways of registration: global registration and local registration.
2.1 After global registration, any V ue instance can be used. For example:
1 2 3 4 5 6 7 8 9 |
|
To use this component in the parent instance, you must register it before the instance is created, and then you can use the component in the form of
The DOM structure of template must be contained by an element. If it is written directly as "here is the content of the component", it will not be rendered without "
". (And the outermost layer can only have one root
tag)
2.2 In a Vue instance, you can use the component option to register a component locally. The registered component is only valid within the scope of the instance. For example:
1 2 3 4 5 6 7 8 9 10 11 |
|
2.3 data must be a function
In addition to the template option, components can also use other options like Vue instances, such as data, computed, methods, etc. But when using data, it is slightly different from the example. data must be a function, and then the data is returned.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 |
|
Generally, the returned object should not refer to an external object, because if the returned object refers to an external object, then this object is shared, and modifications by either party will be synchronized.
So generally a new independent data object is returned to the component.
Supplement: vue-router component reuse issue
The component system is an important part of Vue, it can combine a complex page The abstraction is decomposed into many small, independent, reusable components, and the application is composed by combining components, and combined with vue-router's routing function to map each component to the corresponding route , tell Vue where to render them through changes in routing, and realize jump navigation between various components and pages.
Problem
When using vue-router to switch routes, it will trigger the update of the component tree and render a new component tree according to the defined route. The general switching process is as follows of:
- Deactivate and remove unnecessary components
- Verify the feasibility of switching
- Reuse components that have not been updated
- Enable and activate new components
For specific route switching control process, please refer to the official document: Switching Control Pipeline
How does vue-router determine that a certain component can be reused? Let’s take a look at the following routing configuration:
1 2 3 4 5 |
|
This is the route that loads the corresponding article page through the article ID. When accessed for the first time, the Post.vue component will be rendered into the component tree, and the mounted component will be installed. When we obtain the article content through the article ID and display it on the page, when we access another article, the routing parameters:postId changes. According to our expectations, the content of the new article should be displayed, but it backfires.
What we see is still the previous article. Although the routing parameters have changed, vue-router will think that you are accessing the Post.vue component. Since the component has been rendered before, it will be copied directly. Use the previous component, and will not perform any operations in the component including lifecycle functions such as mounted.
So what we finally see is the content of the original component.
So how can we achieve the desired effect? An effective solution is introduced below
Solution
We can use the watch listener to monitor routing changes. According to the routing The parameters change to respond to the corresponding data. The specific implementation process is as follows:
Define the data acquisition method
首先定义一个获取文章的方法,根据文章ID从后台获取对应的文章信息。
1 2 3 4 5 6 7 8 9 |
|
监听路由
接着是在路由切换的时候判断目标组件是否是Post.vue组件,这里可以根据定义的路由名称name实现,如果是,我们就可以从路由信息中获取目标文章ID来更新组件内容。
1 2 3 4 5 6 7 |
|
组件初始化
这里需要注意的是,当组件首次被挂载到组件树上时,对路由的监听是无效的,这时我们需要在生命周期钩子mounted对组件进行初始化工作:
1 2 3 |
|
相信看了本文案例你已经掌握了方法,更多精彩请关注php中文网其它相关文章!
推荐阅读:
The above is the detailed content of Detailed explanation of vue components and reuse. 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

AI Hentai Generator
Generate AI Hentai for free.

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

CrystalDiskMark is a small HDD benchmark tool for hard drives that quickly measures sequential and random read/write speeds. Next, let the editor introduce CrystalDiskMark to you and how to use crystaldiskmark~ 1. Introduction to CrystalDiskMark CrystalDiskMark is a widely used disk performance testing tool used to evaluate the read and write speed and performance of mechanical hard drives and solid-state drives (SSD). Random I/O performance. It is a free Windows application and provides a user-friendly interface and various test modes to evaluate different aspects of hard drive performance and is widely used in hardware reviews

foobar2000 is a software that can listen to music resources at any time. It brings you all kinds of music with lossless sound quality. The enhanced version of the music player allows you to get a more comprehensive and comfortable music experience. Its design concept is to play the advanced audio on the computer The device is transplanted to mobile phones to provide a more convenient and efficient music playback experience. The interface design is simple, clear and easy to use. It adopts a minimalist design style without too many decorations and cumbersome operations to get started quickly. It also supports a variety of skins and Theme, personalize settings according to your own preferences, and create an exclusive music player that supports the playback of multiple audio formats. It also supports the audio gain function to adjust the volume according to your own hearing conditions to avoid hearing damage caused by excessive volume. Next, let me help you

Windows operating system is one of the most popular operating systems in the world, and its new version Win11 has attracted much attention. In the Win11 system, obtaining administrator rights is an important operation. Administrator rights allow users to perform more operations and settings on the system. This article will introduce in detail how to obtain administrator permissions in Win11 system and how to effectively manage permissions. In the Win11 system, administrator rights are divided into two types: local administrator and domain administrator. A local administrator has full administrative rights to the local computer

Cloud storage has become an indispensable part of our daily life and work nowadays. As one of the leading cloud storage services in China, Baidu Netdisk has won the favor of a large number of users with its powerful storage functions, efficient transmission speed and convenient operation experience. And whether you want to back up important files, share information, watch videos online, or listen to music, Baidu Cloud Disk can meet your needs. However, many users may not understand the specific use method of Baidu Netdisk app, so this tutorial will introduce in detail how to use Baidu Netdisk app. Users who are still confused can follow this article to learn more. ! How to use Baidu Cloud Network Disk: 1. Installation First, when downloading and installing Baidu Cloud software, please select the custom installation option.

NetEase Mailbox, as an email address widely used by Chinese netizens, has always won the trust of users with its stable and efficient services. NetEase Mailbox Master is an email software specially created for mobile phone users. It greatly simplifies the process of sending and receiving emails and makes our email processing more convenient. So how to use NetEase Mailbox Master, and what specific functions it has. Below, the editor of this site will give you a detailed introduction, hoping to help you! First, you can search and download the NetEase Mailbox Master app in the mobile app store. Search for "NetEase Mailbox Master" in App Store or Baidu Mobile Assistant, and then follow the prompts to install it. After the download and installation is completed, we open the NetEase email account and log in. The login interface is as shown below

Detailed explanation of division operation in OracleSQL In OracleSQL, division operation is a common and important mathematical operation, used to calculate the result of dividing two numbers. Division is often used in database queries, so understanding the division operation and its usage in OracleSQL is one of the essential skills for database developers. This article will discuss the relevant knowledge of division operations in OracleSQL in detail and provide specific code examples for readers' reference. 1. Division operation in OracleSQL

MetaMask (also called Little Fox Wallet in Chinese) is a free and well-received encryption wallet software. Currently, BTCC supports binding to the MetaMask wallet. After binding, you can use the MetaMask wallet to quickly log in, store value, buy coins, etc., and you can also get 20 USDT trial bonus for the first time binding. In the BTCCMetaMask wallet tutorial, we will introduce in detail how to register and use MetaMask, and how to bind and use the Little Fox wallet in BTCC. What is MetaMask wallet? With over 30 million users, MetaMask Little Fox Wallet is one of the most popular cryptocurrency wallets today. It is free to use and can be installed on the network as an extension

Apple rolled out the iOS 17.4 update on Tuesday, bringing a slew of new features and fixes to iPhones. The update includes new emojis, and EU users will also be able to download them from other app stores. In addition, the update also strengthens the control of iPhone security and introduces more "Stolen Device Protection" setting options to provide users with more choices and protection. "iOS17.3 introduces the "Stolen Device Protection" function for the first time, adding extra security to users' sensitive information. When the user is away from home and other familiar places, this function requires the user to enter biometric information for the first time, and after one hour You must enter information again to access and change certain data, such as changing your Apple ID password or turning off stolen device protection.
