Lightning Components Developer Guide

What is the Lightning Component Framework?
Quick Start
Creating Components
Using Components
Lightning Component Bundle Design Resources
Use Lightning Components in Lightning Experience and the Salesforce Mobile App
Configure Components for Custom Tabs
Add Lightning Components as Custom Tabs in a Lightning Experience App
Add Lightning Components as Custom Tabs in the Salesforce App
Lightning Component Actions
Override Standard Actions with Lightning Components
Standard Actions and Overrides Basics
Override a Standard Action with a Lightning Component
Creating a Lightning Component for Use as an Action Override
Packaging Action Overrides
Navigation in Lightning Experience and the Salesforce Mobile App Using Page References
Get Your Lightning Components Ready to Use on Lightning Pages
Use Lightning Components in Community Builder
Use Lightning 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
Add Lightning Components to Any App with Lightning Out (Beta)
Lightning Container
Communicating with Events
Creating Apps
Styling Apps
Developing Secure Code
Using JavaScript
Using Apex
Lightning Data Service
Testing Components with Lightning Testing Service
Debugging
Performance
Reference
PDF

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Override Standard Actions with Lightning Components

Add the lightning:actionOverride interface to a Lightning component to enable the component to be used to override a standard action on an object. You can override the View, New, Edit, and Tab 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 a Lightning 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.