How to Make variables read only after task sets to closed completed in ritm form

[Nag9]

Hello Community

I want to set variables tab read only mode on ritm form for non admins to some specific catalog items.

As of now its is working correctly, But  once Y task sets to closed complete on ritm form then only variables should be in read only mode. Now its working once ritm generated, the restrictions on this tab should only apply after this(Y) task is closed

How can we achieve this Here is the codes 

Script include:

var MyGroups = Class.create();
MyGroups.prototype = Object.extendsObject(AbstractAjaxProcessor, {
isGrpMember:function() {
var userID = this.getParameter('sysparm_userID');
var groupID = this.getParameter('sysparm_groupName');
//get the group name based on the group id
gs.log("Entered the function of isGRP Member");
var gr = new GlideRecord("sys_user_group");
gr.addQuery("sys_id",groupID);
gr.query();
if (gr.next()) {
gs.log("Enered into the if condition of my script include");
var groupName = gr.getValue("name");
var thisUser = gs.getUser().getUserByID(userID);
if (thisUser.isMemberOf(groupName)) {
gs.log("Returned true becuase user is member of this group"); 
return true;
}
else {
gs.log("Returned false because user is not a member of this group"); 
return false;
}
} // end of if gr.next
}, 
type:'MyGroups'
});

 Client script:

function onLoad() {
//Type appropriate comment here, and begin script below
var item=g_form.getValue('cat_item');
if (item=='e7d48d55db5f8b00c77b7016bf96199b' || item=='e386bfb3dba68700c77b7016bf961943' || item =='ae244264dbb6c700c77b7016bf961944' || item== '1813429bdb83c700f3e5f156bf9619e9' || item== '0d0c3f5adb28e3001ac0105f6896198e' || item =='f2377d15db9f8b00c77b7016bf96191c' || item=='f477b155db9f8b00c77b7016bf961967')
{
//g_form.addInfoMessage("Entered into if condition");
var ga = new GlideAjax('MyGroups');
ga.addParam('sysparm_name', 'isGrpMember');
//ga.addParam('sysparm_userID', g_user.userID);
ga.addParam('sysparm_userID', g_user.userName);
ga.addParam('sysparm_groupName',g_form.getValue('assignment_group'));
ga.getXML(hideField);
//g_form.addInfoMessage("Entered into the function" +answer);
}
//g_form.addInfoMessage(g_user.hasRole('admin'));
function hideField (response) {
var answer = response.responseXML.documentElement.getAttribute('answer').toString();
//g_form.addInfoMessage("Entered into the function" +answer);
//g_form.addInfoMessage(g_user.hasRole('admin'));
if ((answer == 'false') && !g_user.hasRole('admin')) {
g_form.setVariablesReadOnly(true);
}
else
{
g_form.setVariablesReadOnly(false);
}

}

}

[asifnoor]

Okay.

Kindly mark the comment as a correct answer and also helpful once worked. 

[Nag9]

Thanks a lot asif its working for other users also, Finally its worked 

[miriamberge]

At one point there were several posts about g_form.setVariablesReadOnly(true) not being supported by SN and to use at your own risk... is this now supported by SN?