What does the 'onChange' client script type trigger?

The 'onChange' client script type is specifically designed to trigger an action when the value of a specific field changes. This allows developers to implement dynamic behaviors in a ServiceNow form. For instance, if a user selects a new value from a dropdown or modifies an input field, the onChange script can automatically execute predefined logic, such as recalculating values, displaying warnings, or triggering other interactive elements in the form.

This focus on a specific field change differentiates it from other events, such as record creation, form submission, or form loading, which are triggered under different conditions. By responding to changes in field values, the 'onChange' client script enhances user experience and increases the interactivity and responsiveness of forms within the ServiceNow platform.