Can't hide a cascading fields based of "customer request type" value

Question

def mom_var= getFieldById("customfield_10109").getValue()

if( (mom_var =="it/634ed4a7-315d-4d41-80f1-9f3bf5657791,11100,11405,true"))
{
getFieldByName("Operatin System").setHidden(false)
getFieldByName("Operatin System").setRequired(true)
   
}
else
{
getFieldByName("Operatin System").setHidden(true)
getFieldByName("Operatin System").setRequired(false)    
}

I had try this with "getfieldByID" but it doesn't work either.

ebrahim rezaian · Answer

and I'm sorry 
I'm working on jira server 
@Vishwas

ebrahim rezaian · Answer

yes
it is the only value
it works with other type of fields except cascading fields.

Vishwas · Answer

Hey @ebrahim rezaian

You have mentioned Jira Cloud, and this piece of code you are trying to add in Behaviors ?

is this if( (mom_var =="it/634ed4a7-315d-4d41-80f1-9f3bf5657791,11100,11405,true")) all one value you are trying to compare or multiple values ?

Regards,

Vishwas