🔍 g_form

What is g_form?

g_form is a JavaScript object used in *Client Scripts* to control form behavior, field visibility, values, labels, and more – in real-time!

🧰Commonly usedg_formMethods:

g_form.setValue(fieldName, value);  //👉 Sets the value of a field dynamically.
g_form.getValue(fieldName);  //👉 Retrieves the current value of a form field.
g_form.setVisible(fieldName, true/false);  //👉 Show or hide a field on the form.
g_form.setMandatory(fieldName, true/false);  //👉 Make a field mandatory or optional.
g_form.addInfoMessage('message');  //👉 Display an info message on top of the form.
g_form.clearValue(fieldName);  //👉 Clears a field’s current value.
g_form.setReadOnly(fieldName, true/false);  //👉 Make a field read-only or editable.

🧠 Top 10 Interview Questions & Answers

1️⃣ What is g_form in ServiceNow?

g_form is used in client-side scripts to interact with form fields, such as changing visibility, values, and states dynamically.

2️⃣ How do you set a value in a field using g_form?

g_form.setValue('priority', '1');

3️⃣ How to hide a field on form load?

Use form.setVisible('field_name', false); in an onLoad script.

4️⃣ Difference between getValue and getDisplayValue?

getValue returns the sys\_id; getDisplayValue returns the human-readable value.

5️⃣ What is the use of g_form.setMandatory()?

It dynamically makes a field required or not.

6️⃣ How do you show an info message to the user?

Use g_form.addInfoMessage('Message here');

7️⃣ Can you disable a field based on user role?

Yes, check user roles and use setReadOnly.

8️⃣ What happens if g_form.setValue() is used on a reference field?

It sets the sys\_id of the referenced record.

9️⃣ Can g_form be used in UI Policies?

Yes, for scripting in advanced UI policy actions.

🔟How to clear a reference field using g\_form?

Use g_form.clearValue('reference_field');