Salesforce lightning is an application development framework developed by salesforce.com; it simplifies the business users' processes. Lightning experience is an advanced interface with the latest features and updated pages for streamlining the sales process to increase your business. Lightning has all the technologies and tools to update the Salesforce platform. Due to its out-of-box component set and rich ecosystem, many top companies like Adidas, Cisco Systems, Motorola Inc, and Allianz AG use salesforce lightning to accomplish their business operations and improve their customer relationship. So, everywhere we can find a lot of job opportunities for certified salesforce lightning professionals.
Mindmajix has exclusively designed these salesforce lightning interview questions to assist you in clearing the job interviews.
We have categorized Salesforce lightning Interview Questions - 2022 (Updated) into 2 levels they are:
Salesforce Lightning is a group of technologies and tools that are behind an important upgrade to the Salesforce platform. Salesforce lightning contains the following components:
Experience: It relates to a set of advanced user interfaces that we optimize for speed.
Lightning Exchange: It relates to a part of AppExchange where we find more than 70 partner components to start the development.
Lightning Design System: It relates to the best practices and style guides of advanced enterprise UX to build pixel-perfect apps.
Visual Building tools: It relates to drag-and-drop technologies for easy and quick customization and app building.
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Using two programming models, we can develop the lightning components;
Native Aura Components model
Lightning web components model.
Aura is a freeware technology that powers the lightning components. Aura: namespace comprises all the main building blocks to define applications and components.
Lightning experience is the name for the latest salesforce desktop application, with the latest features, developed with an advanced User Interface(UI) and speed optimization.
Following are the different types of events of salesforce lightning components:
System Events: During the lightning app lifecycle, salesforce fires the system events.
Application Event: The application event extent is across the lightning application, and any element that has enrolled for his event will get an alert.
Component Event: The component event scope is within itself, or within the parent component of this event, all the parent components will get an alert.
A bundle includes Aura definitions and their associated resources. The aura definition can be an application, interface, component, and event. Aura Definition Bundle element is a folder that includes definition files, contrary to other metadata components, the aura definition bundle component is not a single file; it is a group of files.
The lightning design system provides style guides and advanced UX best practices for building pixel-perfect applications that match the feel and look of the salesforce1 mobile app and lightning experience.
We use lightning data service for creating, deleting, editing, or loading a record in our component without Apex code. It handles field-level security and sharing rules. Lightning data service enhances the user interface and performance consistency. The lightning data service's main advantage is we can carry out basic tasks without Apex code.
Following are the component bundles of the lightning components:
Controller: Controller tackles the client-side events.
Style: It includes component style.
Documentation: We use this component bundle for recording the component’s use.
Renderer: The renderer component bundle contains a component default rendering behavior.
Helper: we can write the general logic in the helper that is used by various controller methods to avoid repetition.
We can use Lightning Components with the Salesforce1 mobile app by creating a traditional lightning tab that refers to the component, and we can add that tab to the Salesforce1 mobile navigation.
If we want to use our component on the external site, we have to use lightning out. The advantage of lightning out is we can utilize lightning components in a visual force page.
Attributes are variables that we use for storing the values. We must define the Default, Type, Name, Access, and Description in the attribute definition. In the attribute definition, only Name and Type are the required parameters.
By using Lightning out, we can embed the lightning component on the VisualForce page. We can add the lightning component to the VisualForce page in three steps:
After that, we can generate and point a lightning app that we use for the component dependencies.
By using Lightning App Builder, we can create lightning record pages. Following are different types of lightning record pages:
We use the component event for interaction between the parent and child. We can communicate the change in the child component to the parent component through the component event. We use Application events to send any modification in the component to a wide audience. The components registered for this event will get an alert.
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The AuraEnabled annotation allows the lightning components for accessing the Apex properties and methods. AuraEnabled annotation is overloaded, and we use it for distinct purposes.
We use AuraEnabled on the Apex class static methods for making them accessible like remote controller actions in our lightning components.
We use @AuraEnabled on the Apex Instance methods and properties for making them serializable when we return the class instance like the data from the server-side action.
We use the aura: a method for defining the method within the API of the component. This allows us to call a method directly in the client-side controller of a component rather than handling or dismissing an event. Through <aura: method>, we can simplify the code which the parent component requires for calling a method on the child component.
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.
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.
We can navigate to the following supported features:
Navigation Item Page
Record Relationship Page.
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.
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.
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.
We use the following attributes for storing the values:
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.
In the following places, we can use lightning components:
Drag-and-drop components in the community builder and lightning app builder.
Add lightning components to the lightning pages.
Start the lightning component like a quick action.
Create stand-alone applications.
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.
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:
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.
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<ui:input> does not contain lightning design system styling while <lightning:input> contains lightning design system styling.
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.
Action provider allows us to manage the events, actions, and handlers for the component.
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.
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.
If we have to import a function, class, and variable defined in the module, we have to use the import statement.
lwc is the core module of the lightning web components. “Import” statement imports the LightningElement from the lwc module.
In the salesforce mobile app or the lightning component, we can use the force:appHostable interface as a custom tab.
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.
Lightning schema builder: Schema builder is a user interface tool to create and view the fields, objects, and relationships.
Lightning Connect: This is the integration tool that makes it simpler for our Force.com app for consuming the data from the external source, which compiles to OData spec.
Lightning Process Builder: It is a user interface tool to visualize and create automated business processes.
Lightning Component Framework: Extensions and components which enable you to build the recyclable components personalize the salesforce1 mobile app and develop independent apps.
Lightning App Builder: This is the latest user interface tool that allows us to build lightning apps quickly, through components given by the salesforce platform developers.
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Capture phase: This phase propagates from top to bottom
Bubble phase: This phase propagates from bottom to top.
To define the field level security, we should use Lightning:recordEditForm, force: record data, and Lightning: record form.
We can assign the lightning pages at three distinct levels:
App default: This assignment revokes the assignment done at the org level.
App, profile, record type: This assignment revokes the assignment done at App and org level.
By using “ValueProvide”, we can access the value from the attribute.
Following are the various Global value providers:
Yes, we can integrate the lightning components with other frameworks.
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.
Spinners are the CSS indicators that 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.
We can use aura:donewaiting and aura: waiting to control the loading spinner.
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The topics which you learned in this Salesforce lightning interview questions blog are the most in-demand skills which recruiters look for in certified salesforce lightning professional. I hope this set of salesforce lightning interview questions will help you crack your job interview.
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