Describe Use Cases for JavaScript in a Visualforce Page. PLATFORM-DEVELOPER-II Practice Questions (Page 2)

Questions 6–10

1. 6application · medium

   A Visualforce page displays a custom object 'Order__c' with a lookup field to 'Account'. When the user selects an Account, the page should automatically populate a text field with the Account's billing city without a full page refresh. The developer wants to use JavaScript to retrieve the data. Which approach is most appropriate?

   • AUse JavaScript to read the Account's billing city from a hidden input field that is populated when the page loads.
   • BUse a JavaScript remoting action to call an @AuraEnabled (or @RemoteAction) method that queries the Account and returns the billing city.
   • CUse a Visualforce actionPoller to poll the server every few seconds and update the field.
   • DUse an actionFunction to invoke a controller method that sets the billing city and then rerenders the page.
   Reveal Solution Discussion Select an answer first
2. 7foundation · easy

   How can a developer include the jQuery library in a Visualforce page?

   • ABy adding a <script> tag with a reference to a static resource or CDN
   • BBy placing the library in the Salesforce static resources and it is automatically loaded
   • CBy using an Apex controller to import the library
   • DBy adding a <apex:includeScript> component with the library name
   Reveal Solution Discussion Select an answer first
4. 8foundation · easy

   How can a developer attach a JavaScript event handler to a Visualforce component?

   • ABy using the on* attributes (e.g., onclick) on the component
   • BBy defining an Apex method in the controller
   • CBy using the <apex:actionFunction> component
   • DBy adding a <script> tag inside the component
   Reveal Solution Discussion Select an answer first
5. 9application · medium

   A Visualforce page has a button that, when clicked, should dynamically add a new input field to a form. The developer wants to use JavaScript to handle the click event and insert the new field. Which approach is the most maintainable and aligns with best practices?

   • AUse an inline onclick attribute on the button that calls a global function which sets innerHTML of a container div.
   • BUse an actionFunction to rerender a panel that contains the new input field when the button is clicked.
   • CAttach an onclick event listener to the button in a separate JavaScript file that uses DOM methods to create and append the new input element.
   • DUse a Visualforce actionStatus to show the new field when the button is clicked.
   Reveal Solution Discussion Select an answer first
6. 10foundation · easy

   Which Salesforce feature allows JavaScript to interact with Salesforce data using a REST-like interface without writing Apex code?

   • ASalesforce Connect
   • BApex Web Services
   • CSalesforce Remote Objects
   • DVisualforce Remoting
   Reveal Solution Discussion Select an answer first