Difference between UI police and client script.

Question

Accepted Answer

UI policy and client script are both used in ServiceNow for controlling field behavior and data on forms.

UI policy is used to dynamically change field properties, visibility, and mandatory status based on certain conditions.
Client script is used to add custom logic and behavior to forms, such as field validation, calculations, and UI interactions.
UI policy is executed on the server side, while client script is executed on the client side.
UI policy is defined using a simple drag-and-drop interface, while client script is written in JavaScript.
UI policy can be used to hide sensitive fields or show additional fields based on user roles or conditions.
Client script can be used to perform calculations, display pop-up messages, or interact with other fields on the form.

Accepted Answer

Client script:

1. It execute when the form is onload / onchange /oncelledit / onsubmit.

2. Client script will executes first.

3. We can control execussion order in both client scripts & UI policy.

4. If you want to compare new value and old value in that situation we can't use ui policy and we have to go for client script.

Ui Policy:

1. It execute when the form is load.

2. Ui policy will executes after the client scripts.

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