Lightning Aura Interview Questions for Experienced/Lightning Aura Interview Questions and Answers for Freshers & Experienced

Why do we use $A.enqueueAction(action)?

It adds the server-side controller action to the queue of actions to be executed. Rather than sending a separate request for each individual action, the framework processes the event chain and batches the actions in the queue into one request. The actions are asynchronous and have callbacks.

How can we extend any component?

To make a component extendable we need to set value of ‘extensible’ attribute as ‘true’ of the aura:component tag.
When a component extends another component it inherits all of the helper methods and attributes

What is aura:registerevent in lightning component?

aura:registerevent is the notifier component and it declares that it may fire a particular event, it includes ‘name’ attribute which is relevant only to component event and is not used for application event. Other attribute is the ‘type’ which lets the component know which event would be fired.

Ex. <aura:registerEvent name=”Event” type=”c:EventName”/>

How can we subscribe to an event in the Lightning component?

For subscribing to any event in the Lightning component, tags have to be included in the containment hierarchy. Subscription of this event is dependent on the type of event, i.e. component event or application event.

How can we display the loading spinner in the lightning component?

Spinners are the CSS indicators which we should display while retrieving the data or performing slow calculations. Lightning: spinner shows the animated spinner image for indicating that a request is loading.

How do we assure FLS when working with the Lightning components?

In the APEX controller, we must enforce the CRUD and FLS manually. Also, while using Lightning data service, it takes care of CRUD and FLS.

Can we integrate the Lightning components with other frameworks like Angular?

Yes, we can integrate the lightning components with other frameworks.

What is the meaning of Lightning Experience?

Lightning Experience refers to the new User Interface, which is developed by the Salesforce team and is built on a component-based framework and architecture driven by events that provide a highly dynamic and responsive experience to the user. This framework is designed to give optimum performance by the Client side and the stateless Server architecture.

How can we access the value from the attribute?

By using “ValueProvide”, we can access the value from the attribute.

What are the options for the lightning record page assignment?

We can assign the lightning pages at three distinct levels:

1. Org default

2. App default: This assignment revokes the assignment done at the org level.

3. App, profile, record type: This assignment revokes the assignment done at App and org level.

What is difference between Visualforce Components and Lightning Components?

Visualforce page is created keeping page as the center of the application and most of its calculation is performed at the server side. Lightning component on the other hand are created using the component based framework, most of the calculations are performed at the client side and makes the more dynamic and provide rich customer experience, also lightning component are build using mobile first approach.

What are the tools included in lightning?

Lightning App Builder – It is a tool with User interface to use drag and drop functionality and create app fast by reusing the components, components can be standard or custom depending upon your requirement.
Lightning Component Framework- it provides a bundle that can be used to build reusable custom components, Standalone App and to customize Salesforce1 App
Lightning Connect – it is a powerful tool to facilitate the integration of app with an external data source using OData specification
Lightning Process Builder – it is a visualization tool to build automation required for your business processes.
Lightning Schema Builder – it is a visualizing tool to view, create objects fields and relationship among them.

How can we define the field-level security in the salesforce lightning components?

To define the field level security, we should use Lightning:recordEditForm, force: record data, and Lightning: record form.

How do the capture phase and bubble phase propagate?

1. Capture phase: This phase propagates from top to bottom

2. Bubble phase: This phase propagates from bottom to top.

What is the purpose of the Lightning: action override in the Salesforce Lightning Component?

The Lightning: action override allows us to use the component like an override for the standard action. We Override the New, Edit, Tab, and View the standard actions over the traditional and standard components. Components must implement the Lightning: action override interface that the component emerges in the lightning component bundle menu.

What is the purpose of the force:appHostable interface in the Salesforce lightning component?

In the salesforce mobile app or the lightning component, we can use the force:appHostable interface as a custom tab.

What is the use of Javascript in the LWC(Lightning web components)?

Javascript establishes HTML properties behavior.

1. If we have to import a function, class, and variable defined in the module, we have to use the import statement.

2. Javascript files in the LWCs are the ES6 modules. Everything we declare in the module is local.

3. lwc is the core module of the lightning web components. “Import” statement imports the LightningElement from the lwc module.

What is the use of the meta configuration file in the Lightning Web Component(LWC)?

The meta configuration file specifies the metadata values to the components. If we do not have a configuration file for our component, we will get an error when we push our changes.

Explain Scratch org?

Scratch org is an expandable salesforce org that we use for testing and development. We can create the scratch org for 30 days after which we deactivate the Scratch org. Scratch org default duration is seven days.

Explain Lightning Web Components(LWC)?

By using lightning web components, we can build the lightning components. Lightning web components are the traditional HTML elements built through the advanced javascript and HTML elements. We can build the components by using any model and locate the components on the lightning page. To develop the lightning web components, we need “Salesforce Extensions for the Visual Studio code”, and to deploy the LWC from the organization we need “salesforce CLI”.

What is an Action provider and Value provider?

Action provider allows us to manage the events, actions, and handlers for the component.

The value provider allows us to use the component attribute’s value in the component javascript and markup controller.

What is the use of Lightning:recordEditForm?

In the lightning:recordEditForm, we use the lightning:inputField for creating the editable fields. By using the lightning: output field, we can display the read-only information. lightning:recordEditForm contains the below features:

It displays the record edit layout to edit a particular record.

It displays the record to create the layout to create a particular record.

What is the difference between <ui:input> and <lightning:input>

<ui:input> does not contain lightning design system styling while <lightning:input> contains lightning design system styling.

Explain Namespace in the salesforce lightning components?

We use Namespace for grouping the components together. The lightning components that we use are a part of a Namespace. C is the default namespace, and we can create our namespace through our organization. If we create the namespace for our organization, then we can use that namespace for our lightning components.

Explain Lightning App Builder?

We use lightning app builder for creating the lightning pages for the mobile applications and salesforce lightning experience. A lightning app builder is a click-and-point tool, and we build the lightning pages through the lightning components, which are configurable, reusable, and compact. Through lightning app builder, we can build different types of pages:

1. Home page

2. App Page

3. Record Page

Why Lightning:isUrlAddressable interface is used?

The lightning:isUrlAddressable interface is used when navigating to the component and also when the component to be navigated implements this interface.

How can we deploy components to production org?

We can arrange component by using managed packages, Migration Tool or Change Sets, IDE.

What is the Locker Service used for in Salesforce Lightning?

It is applied for enhanced security purposes. This security architecture safeguards Lightning components by isolating them in their specific namespace. The Locker Service is useful when building components, it also permits access to only supported APIs.

Can Lightning be integrated with a third-party framework?

Yes, it is possible to integrate Lightning with other frameworks, for instance with Angular. You can also apply a third-party framework to Aura components. Nevertheless, you can’t use a third-party framework right within Lightning Web Components.

What are Lightning Data Services?

Lightning Data Services (or LDS) are needed for caching purposes. This framework allows you to upload, add, modify or delete a component’s records without the need of Apex code from the server-side. It is also applicable for Sharing Rules and Field-level Security, not to mention its benefits for enhanced performance and the opportunity it gives the users to work with data offline.

What is the Salesforce Lightning Design System?

Also shortened to SLDS, the Salesforce Lightning Design System is a CSS framework that gathers the top design practices and style guides to assist in creating appealing Lightning applications without the need to write CSS code. As such, SLDS provides numerous default solutions on fonts, colors, palettes, etc.

How can we debug our components?

There are several different ways we can approach component debugging, the fastest and most simple is to simply provide console logging statements to log variables throughout code execution, however this is an extremely limited approach and there are far better ways to debug our components. The first step is to enable “Lightning Debug Mode” to remove minification and provide better error messages. Alongside this, we can use our browsers debugging tools to provide breakpoints to examine the precise execution of code within our components, review variables at run time, and step through our code to better understand what’s going on and find what’s going wrong.

What tools can we use to ease our development?

There are several tools Salesforce provides for us to assist in development regardless of whether we are developing Aura components or LWC. The most notable of which is the SFDX extensions for VSCode, which provide us an IDE experience, far better than that of the Developer Console.

What are Application events?

Any component can dismiss and handle the application events. Application events do not need any type of relationship among the components, and these components should be a part of one application.

Where can we use the lightning components?

In the following places, we can use lightning components:

1. Drag-and-drop components in the community builder and lightning app builder.

2. Add lightning components to the lightning pages.

3. Start the lightning component like a quick action.

4. Create stand-alone applications.

What are Component events?

Components events are the events that child components dismiss, and parent components handle. We use component events when we want to send a value from the child component to the parent component.

What is the importance of the implements in the lightning component?

We use implements for referring to the platform interfaces that allow us to use the components in various contexts, or grant access to additional context data, and by using implements, a component can implement multiple interfaces.

Explain Locker service in Salesforce lightning?

Locker service is a robust security architecture for the lightning components. The locker service improves security by isolating the lightning components which belong to the namespace from the components in the distinct namespace. Locker service supports the practices which enhance the maintainability of our code by enabling access to the supported APIs.

Explain FlexiPage?

FlexiPage portrays the metadata related to a lightning page. The lightning page portrays an adaptive screen composed of regions comprising the lightning components. The lightning page contains 25 components. We store the Flexi page as an XML file, and we deploy it through a deployment tool or metadata API. We refer to the lightning pages as Flexipages in the API.

Explain unbound and bound expressions?

We use unbound and bound expressions for performing the data binding. When we call a child component from the parent component, we can send the value to a child component attribute from the attribute of a parent component.

How to create a custom Lightning Record Page?

We can create it with the following steps:

Setup->App Builder in Quick Find Box->Select Lightning App Builder-> New->Record Page-> Name the page as <xxx>Select Opportunity->Choose Header, Sub header, Right Sidebar template and Click Finish.

Please go through the link for further details on creating a custom Lightning Page.

When would Lightning Out be used?

The Lightning Out feature is applicable in cases when a component that you’ve made needs to be used on an external site outside Salesforce containers as well as on any webpage.

Tell me the use of the Aura method tag in Lightning?

We can Use <aura: method> to describe a technique as part of a component’s API. This enables us to straight call a process in a component’s client-side manager instead of firing and management a constituent event. Using simplifies the code desirable for a father component to call a technique on a child component that it contains.

Explain force: record data?

The force: record data is a conventional controller of the lightning component. We can accomplish the operations like deleting, creating, and editing a record through force: record data. If we want to use force: record data, it removes and recognizes the replicate request passing to the server if we request for the same record data.

How to create custom Lightning record pages in Salesforce with Lightning Experience? Can you do the same for Salesforce mobile app?

Add, remove, or you can even reorder components on a record page for a custom view of object’s records with the help of Lightning App Builder.

Yes, it is also possible to customize a record page and assign it to the Lightning apps. The users can access a custom record page for the context of the app they are working on.

What are the types of record pages in Salesforce Lightning?

Created using the Lightning App Builder, there are three following record page types in Lightning:

1. Home Page (needed for crafting home pages that’ll display only necessary features to indicated user types in the Lightning Experience);

2. Record Page (used for making a unique record page of an object based on the necessities of users; available in mobile apps and in Lightning Experience);

3. App Page (applicable in Lightning Experience and in mobile apps, it’s handy when making an app homepage in 3rd-party apps and menus for navigation, such pages can only have global actions).

What Salesforce limitations are there for the allowed maximum number of components per app?

Actually, no, there is no limit regarding how many components are allowed in an application.

Do you create an App Bundle first to create a Lightning component?

Not really, however, the component bundle can be created first.

Is it possible to integrate lightning components with a framework such as Angular?

It is possible to insert the third-party code within a Visualforce page. The same Visualforce page is then put inside a Lightning component. Then the same Lightning Component is used in another Lightning component that works for various environments.

What benefits are there to using the UI API?

The main benefits to using the UI API are the same as using the LDS, we get cached data for improved performance and ease of data management, ensuring all our components are displaying the correct data. Alongside these, there is the added benefit of reducing the amount of Apex code written, e.g. we no longer need to write controller methods for simple record updates.

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