User Interface

Building custom UIs with Visualforce, Lightning Web Components, Aura, and ensuring UI and data access security.

5 minutes 5 Questions

In the context of Salesforce Certified Platform Developer I, the User Interface (UI) refers to the visual and interactive layer through which users interact with Salesforce applications. It encompasses several key technologies and frameworks that developers must understand. **Visualforce** is a tr…

Concepts covered
Visualforce Page FundamentalsVisualforce Controllers: Standard, Custom, and ExtensionsLightning Web Components BasicsAura Components OverviewLWC Events and Component CommunicationLightning Component Framework Benefits@AuraEnabled Methods and Wire AdaptersFlow and Agentforce Integration with UIUI Security: XSS PreventionUI Security: SOQL Injection PreventionCRUD and Field-Level Security EnforcementLightning Design System (SLDS)
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PD1 - User Interface Example Questions

Test your knowledge of User Interface

Question 1

Which file in an Aura component bundle is the only required resource that must be present for the component to exist?

Correct Answer: The component markup file (.cmp)

The component markup file (.cmp) is the only required resource in an Aura component bundle because it defines the component's structure and is the minimum file needed for the component to be recognized and rendered by the framework.

The controller file is optional and only needed when the component handles user interactions or events. The design file is optional and only required when exposing the component's attributes in tools like Lightning App Builder. The helper file is also optional and used to store reusable JavaScript functions called from the controller.

Key concept tested: understanding the Aura component bundle structure and its required versus optional resources.

Question 2

A developer is creating their first Lightning Web Component to display a greeting message. The component should render the text 'Hello, World!' inside a paragraph tag. The developer has created the HTML template and JavaScript file but the component does not appear in the Lightning App Builder. What is the most likely reason the component is not available?

Correct Answer: The component is missing a properly configured metadata XML file with the correct targets defined

Every Lightning Web Component requires a metadata XML configuration file (componentName.js-meta.xml) that specifies where the component can be used, and without the correct targets defined (such as lightning__AppPage, lightning__RecordPage, or lightning__HomePage), the component will not appear in the Lightning App Builder.

CSS files are optional for Lightning Web Components and are not required for rendering. The JavaScript class must extend LightningElement, not LightningApp, which does not exist as a valid base class. There is no lightning-app-builder attribute for HTML template tags.

Key concept tested: LWC component configuration via the metadata XML file and target definitions for App Builder visibility.

Question 3

A new developer is creating their first Visualforce page. They want to display a single Account record and use the built-in Save button functionality provided by Salesforce. The developer writes: <apex:page controller="Account">. When they try to save the page, they receive an error. What should the developer change to make the page work correctly?

Correct Answer: Replace controller="Account" with standardController="Account"

The standardController attribute is the correct way to bind a Visualforce page to a standard Salesforce object like Account, which automatically provides built-in CRUD functionality including the Save button.

The controller attribute is used to reference a custom Apex controller class, not a standard object. The extensions attribute is used to extend a standard or custom controller, not replace it. There is no customController attribute in Visualforce. Adding an extension is unnecessary since the requirement only asks for basic standard controller functionality.

Key concept tested: understanding the difference between the standardController and controller attributes on the apex:page tag in Visualforce.

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