How to use keep-alive to optimize user experience in vue projects

How to use keep-alive in Vue projects to optimize user experience

When developing Vue projects, we often face a problem: when users switch pages frequently, each switch will cause the current page to be re-rendered. The user experience has been affected to a certain extent. In order to solve this problem, Vue provides a component called keep-alive, which can cache the page and reduce the number of page re-renders, thus improving the user experience. This article will introduce how to use keep-alive to optimize user experience in Vue projects.

What is keep-alive

keep-alive is an abstract component provided by Vue that allows included components to remain in memory instead of re-rendering. When a component is wrapped in a keep-alive component, the component will be cached and will not be re-rendered until the component switches to another route or is destroyed.

How to use keep-alive

Using keep-alive in a Vue project is very simple. You only need to wrap the components that need to be cached in the keep-alive tag.

<template>
  <div>
    <keep-alive>
      <router-view></router-view>
    </keep-alive>
  </div>
</template>

In the above example, we wrapped the 975b587bf85a482ea10b0a28848e78a4 component in the 7c9485ff8c3cba5ae9343ed63c2dc3f7 tag. In this way, when the user switches routes, the 975b587bf85a482ea10b0a28848e78a4 component will be cached and will not be re-rendered the next time the user switches back to the route.

Keep-alive life cycle hook function

The keep-alive component provides two life cycle hook functions: activated and deactivated. We can perform some additional functions in these two hook functions. operate.

<template>
  <div>
    <keep-alive @activated="handleActivated" @deactivated="handleDeactivated">
      <router-view></router-view>
    </keep-alive>
  </div>
</template>

<script>
export default {
  methods: {
    handleActivated() {
      console.log('页面被激活');
    },
    handleDeactivated() {
      console.log('页面被停用');
    }
  }
}
</script>

In the above example, we printed a message in the activated and deactivated hook functions respectively. When the page is activated (that is, switching back to this route from other routes), the activated hook function will be called; when the page is deactivated (that is, switching from this route to other routes), the deactivated hook function will be called.

Keep-alive usage scenarios

keep-alive is suitable for the following scenarios:

1. Pages with a large amount of static content: In some pages, It may contain a large amount of static content, which does not need to be re-rendered every time the page is switched. This content can be wrapped in keep-alive to improve the loading speed of the page.
2. Form input page: During the process of user inputting the form, if the user switches to another page and then switches back, the user needs to refill the previous input content. Use keep-alive to cache the form page and retain the user's input.
3. Pages with complex logic: Some pages may contain complex data processing logic. Recalculating these data every time the page is switched will affect the user experience. Using keep-alive can avoid repeated calculations and improve page performance.

Summary

By using the keep-alive component, we can effectively improve the performance and user experience of the Vue project. During the development process, reasonable use of keep-alive based on actual needs can avoid unnecessary page rendering, improve page loading speed, and reduce user waiting time. At the same time, we can also use the keep-alive life cycle hook function to perform additional operations when switching pages. I hope this article can help you better understand and use keep-alive components for performance optimization.

Reference:

• Vue official documentation: https://vuejs.org/v2/api/#keep-alive

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