Salesforce Platform Developer Practice Exam

What is a valid way of loading external JavaScript files into a Visualforce page? (Choose 2)

1. Using an apex:includeScript tag.

2. Using an apex:define tag.

3. Using a link tag.

4. Using a script tag.

The correct answer is: Using an apex:includeScript tag.

Loading external JavaScript files into a Visualforce page can be accomplished through the use of specific tags designed for this purpose. The apex:includeScript tag stands out because it provides a straightforward method for including external JavaScript files. It automatically handles the necessary placement and loading of the script in the correct order, ensuring that dependencies are respected. A key feature of the apex:includeScript tag is its integration with Salesforce's static resources. When you use this tag, it allows you to reference JavaScript files stored in static resources, making it a best practice to organize and manage your scripts efficiently. This not only simplifies the process but also enhances maintainability of your Visualforce pages. In addition to apex:includeScript, utilizing the script tag is another valid method for loading JavaScript files. This HTML tag can be used to load scripts directly from any URL. However, it is essential to ensure that the scripts are accessible and properly secured, as this method relies on standard HTML practices to load external resources. Choosing both of these options allows developers to either leverage Salesforce's built-in capabilities for script management or directly link to external scripts, depending on the requirements and context of their Visualforce application.