Lightning Components Developer Guide
jSummer '26 (API version 67.0)
Spring '26 (API version 66.0)
Winter '26 (API version 65.0)
Summer '25 (API version 64.0)
Spring '25 (API version 63.0)
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Spring '24 (API version 60.0)
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Summer '23 (API version 58.0)
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Summer '22 (API version 55.0)
Spring '22 (API version 54.0)
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Summer '21 (API version 52.0)
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Summer '20 (API version 49.0)
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Summer '15 (API version 34.0)
Spring '15 (API version 33.0)
Winter '15 (API version 32.0)
App Overview
Designing App UI
Creating App Templates
Content Security Policy Overview
What is LockerService?
Sharing JavaScript Code Across Components
DOM Access Containment
Using the AppCache
Distributing Applications and Components
Newer Version Available
Writing Secure Code
We’ve talked at a high level about CSP and LockerService. This section gives you
specific details about how to write secure code.
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Sharing JavaScript Code Across Components
You can build simple Lightning components that are entirely self-contained. However, if you build more complex applications, you probably want to share code, or even client-side data, between components. -
DOM Access Containment
A component can only traverse the DOM and access elements created by a component in the same namespace. This behavior prevents the anti-pattern of reaching into DOM elements owned by components in another namespace.