keepalive usage life cycle in vue

In Vue, the keep-alive directive is used to cache components to maintain their state. It can be used on components to modify the component's life cycle, including activated and deactivated. The advantages of keep-alive include reducing repeated rendering and maintaining state, but the disadvantage is that it takes up memory and may cause problems. Best practices include using it only for components that need to maintain state, using the exclude and include attributes to filter components to be cached, and limiting the number of caches.

keep-alive usage and life cycle in Vue

What is keep-alive?

keep-alive is a Vue directive used to cache component instances so that their state is maintained across navigation or route switches.

Usage method

Use the keep-alive directive on the component:

<keep-alive>
  <my-component></my-component>
</keep-alive>

Life cycle

When using keep-alive, the component will have the following modified life cycle:

• activated: When the component is Fired on activation (restoration from cache).
• deactivated: Triggered when the component is deactivated (cached to memory).

Advantages

• #Reduce repeated rendering: Cache rendered components to avoid unnecessary re-rendering and improve performance .
• Preserve component state: Preserve the state of the component (such as form input or scroll position) when routing switches.

Disadvantages

• Memory usage: Caching components into memory may increase memory usage.
• May cause problems: Deactivated components may still be accessible through cache, sometimes causing problems.

Best Practices

• Use keep-alive only for components that need to maintain state.
• Use <keep-alive>exclude to filter components that should not be cached.
• Consider using the max attribute to limit the number of cached components.
• Use the include attribute to specify the components to be cached.

Conclusion

keep-alive is a powerful directive that can be used to improve performance and maintain component state. By understanding its usage, lifecycle, and best practices, you can use it effectively to optimize your Vue application.

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