What do you need to know about lightning locker?

What do you need to know about lightning locker?

Lightning Locker provides component isolation and security that allows code from many sources to execute and interact using safe, standard APIs and event mechanisms. Lightning Locker is enabled for all custom Lightning web components. In JavaScript, strict mode is enforced in modules but optional in regular programs.

Is the eval ( ) function supported in Lightning locker?

In Lightning Locker, use of the eval() function is supported to enable use of third-party libraries that evaluate code dynamically. However, it is limited to work only in the global scope of the namespace. The eval() function can’t access the local variables within the scope in which it’s called.

How does Lightning locker work in JavaScript?

Lightning Locker implicitly enables JavaScript strict mode. You don’t need to specify “use strict” in your code. JavaScript strict mode makes code more secure, robust and supportable. A component can only traverse the DOM and access elements created by a component in the same namespace.

How to disable Lightning locker in Salesforce components?

When components become compliant with the current security enhancements, you can change the setting to the current API version. Disable Lightning Locker for an Aura component by setting the Salesforce API version to 39.0 or lower for the component. If a component is set to at least API version 40.0, Lightning Locker is enabled.

When does the Lightning locker update come out?

Lightning Locker uses various technologies and techniques to make Lightning Components secure. It will be available as a critical update as part of Summer ’16 and will be enforced in Winter ’17. Note: As of February 2017, we have updated the information available regarding Lightning Locker.

When does the CSP apply for lightning locker?

If you have a sandbox or Developer Edition org with the Lightning Locker critical update activated, the stricter CSP will apply when Spring ’17 rolls out. If you deactivate the Lightning Locker critical update before the Spring ’17 release, the stricter CSP won’t be applied.

Why is lightning locker disabled for unsupported browser?

Lightning Locker blocks access to some global JavaScript objects that are available to other Salesforce features. Lightning Locker Disabled for Unsupported Browsers Lightning Locker relies on some JavaScript features in the browser: support for strict mode, the WeakMap object, and the Proxy object.

Lightning Locker is a powerful security architecture for Lightning components. Lightning Locker enhances security by isolating Lightning components that belong to one namespace from components in a different namespace.

Which is the isolation mechanism for the Lightning component framework?

The Lightning Component Framework comes with two isolation mechanisms: LockerService and the Lightning Container Component (in Developer Preview in Spring ’17). LockerService is the primary and preferred isolation mechanism for the Lightning Component Framework.

When did the Lightning container component come out?

The Lightning Container Component is in Developer Preview in Spring ’17. The Lightning Container Component can be used to sandbox components or apps built with libraries that don’t run with LockerService.

When to use strict mode in JavaScript Lightning locker?

In JavaScript, strict mode is enforced in modules but optional in regular programs. However, Lightning Locker implicitly enables JavaScript strict mode everywhere. You don’t need to specify “use strict” in your code. JavaScript strict mode makes code more secure, robust, and supportable.

Which is the correct way to pass parameters to lightning JS controller?

Wrap your button in a div, attach the value to the div via a data- attribute and grab it from the event.currentTarget. Eg: The alternative method is to define a new custom component for a row in the table.

What do you need to know about lockerservice component?

LockerService wraps standard objects like window, document, and element inside a secure version of these objects (SecureWindow, SecureDocument and SecureElement) as a way to control access to APIs and regions of the DOM.