How can global JavaScript be controlled in a Liferay theme?

In Liferay themes, controlling global JavaScript is primarily achieved by editing the main.js file located in the theme's source folder. This file serves as the centralized location for custom JavaScript that will be used across all pages where the theme is applied. By modifying this file, developers can define global functions, manage event listeners, and implement other JavaScript functionalities that need to be accessible throughout the entire theme.

Utilizing the main.js file allows for better organization and maintainability of JavaScript code within the theme. It ensures that any script you wish to run globally can be placed in one file, which is particularly useful for ensuring consistency across various components of the application.

Other options, while they may relate to JavaScript functionality, do not provide a direct mechanism for controlling global JavaScript within a Liferay theme. For example, configuring the portlet layout pertains more to the structural arrangement of components rather than the script behavior, while using external JS libraries allows for including additional functionality but does not directly control how global JavaScript is managed. Setting a custom theme in the database impacts the overall appearance and behavior of the site but doesn’t address the specifics of managing global JavaScript in the theme environment.