Describe the Techniques for Using Visualforce to Perform Actions and Partial Page Refresh. PLATFORM-DEVELOPER-II Practice Questions (Page 3)

Questions 11–15

1. 11application · medium

   A developer needs to refresh a list of Cases every 30 seconds on a Visualforce page without user interaction. The page should only refresh the list component, not the entire page. What should the developer use?

   • AactionSupport with a rerender attribute pointing to the list component
   • BactionFunction with a JavaScript setInterval to call the controller
   • CactionPolling with a rerender attribute pointing to the list component
   • DJavaScript remoting with a setInterval to call an Apex method
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2. 12foundation · easy

   What is the primary purpose of using an actionRegion in a Visualforce page?

   • ATo limit the components that are processed and refreshed during an AJAX request.
   • BTo define a region of the page that can be hidden or shown dynamically.
   • CTo prevent validation errors from occurring in components outside the region.
   • DTo group multiple actions so they execute in a single server-side transaction.
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4. 13foundation · easy

   A developer wants a Visualforce page to automatically refresh a section of the page every 30 seconds. Which component should be used?

   • AactionStatus
   • BactionSupport
   • CactionFunction
   • DactionPolling
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5. 14application · medium

   A Visualforce page has a large form with many input fields. A developer wants to validate only a subset of fields when a user clicks a 'Save' button, and then refresh only a small status message area. The validation rules for the other fields should not run. What should the developer do?

   • AWrap the entire form in an actionRegion and set the button's rerender attribute to the status message component.
   • BSet the Save button's rerender attribute to the status message and add a reRender attribute to each input field.
   • CWrap the subset of fields and the Save button in an actionRegion, and set the button's rerender attribute to the status message component.
   • DUse an actionFunction to call the controller and manually refresh the status message with JavaScript.
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6. 15application · medium

   A developer is creating a Visualforce page that needs to call an Apex method from JavaScript. The method is annotated with @RemoteAction and returns a list of Accounts. The developer wants to display the Accounts in a table on the page. What is the correct way to call the method and process the results?

   • AUse actionPolling to call the method and refresh the table.
   • BUse actionFunction to call the method and rerender a table component.
   • CUse actionStatus to call the method and display the results.
   • DUse the generated JavaScript function from the Visualforce page and process the results in a callback function.
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