It runs after component is added to DOM.

It runs when component is removed.

Vue Lifecycle Hooks - Learn VUEJS | Revochamp

Name: Vue Lifecycle Hooks
Availability: InStock
Author: Revochamp

What are Lifecycle Hooks?

Lifecycle hooks are special methods in Vue that allow you to run code at specific stages of a component's life.

Lifecycle Phases

Phase	Hooks
Creation	created
Mounting	beforeMount, mounted
Updating	beforeUpdate, updated
Unmounting	beforeUnmount, unmounted

created Hook

Called when the component is created but not yet mounted to the DOM.

JavaScriptRead-only

created() {
  console.log('Component created');
}

created() {
  console.log('Component created');
}

mounted Hook

Called after the component is mounted to the DOM.

JavaScriptRead-only

mounted() {
  console.log('Component mounted');
}

mounted() {
  console.log('Component mounted');
}

updated Hook

Called when reactive data changes and the DOM updates.

JavaScriptRead-only

updated() {
  console.log('Component updated');
}

updated() {
  console.log('Component updated');
}

unmounted Hook

Called when the component is removed from the DOM.

JavaScriptRead-only

unmounted() {
  console.log('Component destroyed');
}

unmounted() {
  console.log('Component destroyed');
}

Use Cases

Fetch data in mounted()
Initialize variables in created()
Watch DOM updates in updated()
Cleanup resources in unmounted()

Best Practices

Use mounted for DOM-related logic
Avoid heavy logic in updated
Clean up timers and listeners in unmounted
Use created for initial setup

Common Mistakes

Using DOM before mounted
Heavy operations in updated hook
Not cleaning resources in unmounted
Confusing created and mounted hooks

Conclusion

Lifecycle hooks are essential for controlling component behavior at different stages, enabling efficient and organized Vue applications.

Phase

Hooks

Creation

created

Mounting

beforeMount, mounted

Updating

beforeUpdate, updated

Unmounting

beforeUnmount, unmounted

Vue Lifecycle Hooks

Vue Lifecycle Hooks

What are Lifecycle Hooks?

Lifecycle Phases

created Hook

mounted Hook

updated Hook

unmounted Hook

Use Cases

Best Practices

Common Mistakes

Conclusion

Try it yourself

Test Your Knowledge

Frequently Asked Questions

Need help?

Vue Lifecycle Hooks

Vue Lifecycle Hooks

What are Lifecycle Hooks?

Lifecycle Phases

created Hook

mounted Hook

updated Hook

unmounted Hook

Use Cases

Best Practices

Common Mistakes

Conclusion

Try it yourself

Test Your Knowledge

Frequently Asked Questions

Need help?