N/currentRecord Module
Field.isDisabled
Property Description: This property reflects the display type of a field. A value of true means the field is disabled. A value of false means the field is enabled. Note also: If you are working with a body field, you can use this property to change the field’s display type. If you are working with a sublist field, you can set this property to true or false, but be aware that this action affects the entire sublist column, even though a sublist field is associated with one line. For both body and sublist fields, you can use Field.isDisabled to determine whether the field is disabled or enabled.
Type: boolean
Module: N/currentRecord Module
Supported Script Types: Client scripts For more information, see SuiteScript 2.0 Client Script Type.
Since: 2016.2
Search NetSuite - https://system.netsuite.com/app/help/helpcenter.nl?search=Field.isDisabled

// Code Example 1

//Add additional code

//...

if (objField.isDisabled) {

    ...

}

//...

//Add additional code



//SOURCE: https://system.netsuite.com/app/help/helpcenter.nl?fid=section_4794215939.html