Describe Use Cases for JavaScript in a Visualforce Page. PLATFORM-DEVELOPER-II Practice Questions (Page 6)

Questions 26–30

1. 26application · medium

   A developer is building a Visualforce page with a custom search box. As the user types, the page should show a dropdown of matching records without a page refresh. Which JavaScript technique is most appropriate to implement this live search behavior?

   • AUse a form submit button that triggers a full page reload with the search results.
   • BUse a Visualforce actionStatus to show the search results when the user clicks a button.
   • CAttach a keyup event handler to the input field that uses AJAX to fetch matching records and updates a div with the results.
   • DUse an actionFunction that is called on every keystroke and rerenders the entire page.
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2. 27expert · hard

   A Visualforce page has a table with many rows. Each row has a button that, when clicked, should expand a hidden detail section below the row. The developer wants to attach event handlers to these buttons. Which approach is most efficient and maintainable?

   • AUse event delegation by attaching a single click handler to the table that checks if the clicked element is a button.
   • BUse a Visualforce actionFunction to handle the click and rerender the detail section.
   • CAttach an individual click handler to each button using a loop.
   • DUse inline onclick attributes on each button that call a global function.
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4. 28foundation · easy

   Which statement best describes how JavaScript interacts with a Visualforce page?

   • AJavaScript runs on the server to process page requests
   • BJavaScript is used to define the database schema for the page's objects
   • CJavaScript is used to compile Visualforce markup into HTML
   • DJavaScript runs in the browser and can manipulate the page's DOM and handle events
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5. 29foundation · easy

   What is the primary role of JavaScript in a Visualforce page?

   • ATo define the page layout and styling of Visualforce components
   • BTo replace Apex controllers for all data manipulation
   • CTo execute server-side business logic and database queries
   • DTo enhance client-side interactivity and dynamic behavior of the page
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6. 30foundation · easy

   What does DOM manipulation in a Visualforce page allow JavaScript to do?

   • AAlter the Visualforce page's server-side markup
   • BChange the Salesforce security settings
   • CModify the Apex controller's variables
   • DChange the content and structure of the page dynamically
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