PL 400 PCF Controls (Power Apps Component Framework) 3

Question 1

Which PCF context API provides methods to format dates, numbers, and currency values according to the current user's locale?

Accepted Answer

context.formatting

Answer

context.utils

Answer

context.locale

Answer

context.globalization

Question 2

What does `context.webAPI` enable a PCF control to do?

Accepted Answer

Perform CRUD operations (create, retrieve, update, delete) on Dataverse records from within the control

Answer

Call arbitrary external REST APIs and return the response to the host

Answer

Access files stored in SharePoint through the SharePoint REST API

Answer

Trigger Azure Logic Apps and Functions from the component

Question 3

What is the recommended approach for supporting multiple languages in a PCF control's UI text?

Accepted Answer

Define resx string resource files in the manifest and retrieve translated strings at runtime via context.resources.getString('key')

Answer

Hardcode strings in TypeScript and rely on the browser's built-in translation feature

Answer

Store translations as Dataverse configuration records and query them on init

Answer

Use context.locale.translate() to pass raw text for automatic translation

Question 4

In the PCF manifest, what is the behavioral difference between a property with `usage='bound'` versus `usage='input'`?

Accepted Answer

'bound' enables two-way data flow (read and write); 'input' is read-only (the control cannot push values back)

Answer

'bound' restricts the property to model-driven apps; 'input' allows use in canvas apps

Answer

'bound' properties are persisted to Dataverse automatically; 'input' properties are transient

Answer

'bound' properties require TypeScript type definitions; 'input' properties work with plain JavaScript

Question 5

Which PCF API should a developer use to determine whether the control is running in a web browser, a mobile app, or a tablet app?

Accepted Answer

context.client.getClient()

Answer

context.mode.isMobile

Answer

context.device.platform

Answer

context.environment.clientType

Question 6

What is the correct way to include an external npm library such as Chart.js in a PCF control?

Accepted Answer

Install it with npm, import it in the TypeScript source, and let Webpack bundle it automatically during `npm run build`

Answer

Download the library's .js file and manually copy it into the project root folder

Answer

Add the library's CDN URL as an `<external-service-usage>` element in ControlManifest.Input.xml

Answer

Use `pac pcf import-library` to register the dependency in the PCF registry

Question 7

What does `context.mode.isControlDisabled` indicate, and how should a PCF developer respond to it?

Accepted Answer

The host has locked or disabled the field, so the control should render in a non-interactive, read-only state

Answer

The control should stop making Dataverse web API calls until the value is false

Answer

The control should hide itself from the form until re-enabled

Answer

The control should revert all unsaved input to the last committed field value