


How to use vue's keep-alive to switch between the front and back of components
How to use Vue’s keep-alive to switch between the front and back of components
Introduction:
Vue.js is one of the most popular front-end frameworks at present, and it provides a very convenient way. to build the user interface. Vue's keep-alive component plays a very important role in the component's front and back switching process. This article will introduce how to use Vue's keep-alive component to achieve front and back switching of components, and provide corresponding sample code.
- Overview of Vue's keep-alive component
Vue's keep-alive component is an abstract component provided by Vue, which can be used to cache dynamic components (or asynchronous components). It can retain the state of components and avoid re-creating and destroying component instances when components switch, thereby improving application performance. - Basic usage of keep-alive components
When using the keep-alive component, you first need to wrap the component to be cached in the keep-alive tag. For example:
<template> <div> <keep-alive> <component :is="currentComponent"></component> </keep-alive> <button @click="switchComponent">切换组件</button> </div> </template> <script> export default { data() { return { currentComponent: 'ComponentA' // 初始时显示ComponentA组件 }; }, methods: { switchComponent() { this.currentComponent = this.currentComponent === 'ComponentA' ? 'ComponentB' : 'ComponentA'; } } }; </script>
In the above code, we use a button to switch the component to be displayed. During component switching, the keep-alive component caches the old component instead of destroying it, thus avoiding the need to recreate component instances.
- Advanced usage of keep-alive component
In addition to basic usage, the keep-alive component can also provide some hook functions to execute corresponding logic when the component is cached and activated.
- activated hook: Called when the cached component is activated. You can use this hook function to perform some logical operations that need to be performed when the component is displayed.
<template> <div> <keep-alive> <component :is="currentComponent" v-bind="$attrs" v-on="$listeners"></component> </keep-alive> <button @click="switchComponent">切换组件</button> </div> </template> <script> export default { data() { return { currentComponent: 'ComponentA' }; }, methods: { switchComponent() { this.currentComponent = this.currentComponent === 'ComponentA' ? 'ComponentB' : 'ComponentA'; } }, activated() { console.log('组件被激活了'); } }; </script>
- deactivated hook: called when the cached component is deactivated. You can use this hook function to perform some logical operations that need to be performed when the component is hidden.
<template> <div> <keep-alive> <component :is="currentComponent" v-bind="$attrs" v-on="$listeners"></component> </keep-alive> <button @click="switchComponent">切换组件</button> </div> </template> <script> export default { data() { return { currentComponent: 'ComponentA' }; }, methods: { switchComponent() { this.currentComponent = this.currentComponent === 'ComponentA' ? 'ComponentB' : 'ComponentA'; } }, activated() { console.log('组件被激活了'); }, deactivated() { console.log('组件被停用了'); } }; </script>
In the above code, we use activated and deactivated hook functions to output corresponding information when the component is activated and deactivated.
- Summary
In this article we introduced the basic usage and advanced usage of Vue's keep-alive component. By using the keep-alive component, we can retain the state of the component during the component's foreground and background switching and improve application performance. I hope this article will be helpful to you when using Vue's keep-alive component to switch between the front and back of components.
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