Lightning Aura Components Developer Guide

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Introducing Aura Components
Quick Start
Creating Components
Using Components
Aura Component Bundle Design Resources
Use Aura Components in Lightning Experience and the Salesforce Mobile App
Configure Components for Custom Tabs
Add Aura Components as Custom Tabs in a Lightning Experience App
Configure Components for Custom Actions
Configure Components for Record-Specific Actions
Create an Email as a Quick Action
Override Standard Actions with Aura Components
Standard Actions and Overrides Basics
Override a Standard Action with an Aura Component
Creating an Aura Component for Use as an Action Override
Packaging Action Overrides
Navigate Across Your Apps with Page References
Get Your Aura Components Ready to Use on Lightning Pages
Use Aura Components in Experience Builder
Use Aura Components with Flows
Add Components to Apps
Integrate Your Custom Apps into the Chatter Publisher
Using Background Utility Items
Use Lightning Components in Visualforce Pages
Use Aura and Lightning Web Components Outside of Salesforce with Lightning Out (Beta)
Lightning Container
Communicating with Events
Communicating Across the DOM with Lightning Message Service
Creating Apps
Styling Apps
Developing Secure Code
Using JavaScript
Working with Salesforce Data
Testing Components
Debugging
Performance
Reference
PDF

Override Standard Actions with Aura Components

Add the lightning:actionOverride interface to an Aura component to enable the component to be used to override a standard action on an object. You can override standard actions on most standard and all custom components. Overriding standard actions allows you to customize your org using Lightning components, including completely customizing the way you view, create, and edit records.

Overriding an action with an Aura component closely parallels overriding an action with a Visualforce page. Choose a Lightning component instead of a Visualforce page in the Override Properties for an action.Override a standard action with a Lightning component

However, there are important differences from Visualforce in how you create Lightning components that can be used as action overrides, and significant differences in how Salesforce uses them. You’ll want to read the details thoroughly before you get started, and test carefully in your sandbox or Developer Edition org before deploying to production.