ServiceNow Certified System Administration Practice

Client scripts are used to customize the behavior on the client-side in ServiceNow instances, particularly in forms and lists. They are executed in the user's browser, allowing for real-time updates and interactions without the need for server communication.

The correct answer specifies that client scripts only apply when the form loads. This is because one of the primary functions of client scripts is to manipulate the form fields, modify their values, or alter their visibility when the user first accesses the form. This initial trigger enables various custom behaviors, such as populating default values, setting field properties, or displaying warnings to users as soon as they open the form.

In contrast, other scenarios have different mechanisms or components. For example, form submission involves server-side processing and validation, while record updates typically utilize business rules or other server-side components. Table queries do not directly involve client scripts either, as they pertain to data retrieval from the backend without immediate interaction with front-end elements.

Thus, the context of client scripts being exclusive to form-loading scenarios underscores their role in enhancing user experience right from the start of their interaction with a form.