SetReadonly is not working for choices fields

[siva44]

I have created one onload client script for impact and choice fields in incident form but it is not working

Onload :

Function onLoad () {

g_form. SetReadOnly ("impact", true) ;

g_form. SetReadOnly ("urgency ", true) ;

} 

[yasuhirotakahas]

A Support KB provides the solution;

https://support.servicenow.com/kb?id=kb_article_view&sysparm_article=KB1170048