Hide UI Action button based on field value on Load after saving.

[VullankiL]

There is a ui action button Input Required (input_required) with some other conditions that needed. hence, they used onclick functions in script field.
Now my requirement is that I am using these Input Required button in change_request table.

It has one field requested_by (reference field). 
if the user in the requested_by field is part of Software Group, then i want to hide the input_required button. It have to work when "onLoad" not onChange. 
How can I achieve this using client script or Script include or both. what is the answer? 
Please help me with this.

[Mark Manders]

It's a ui action, so just use the condition field: !gs.getUser().isMemberOf('Software')

[VullankiL]

But here i want to check the user in requested_by field is part of Software group.
Not the current user. 

How can i achieve this?

[Mark Manders]

Use this in the condition:

new UserGroupChecker().isRequestedByInGroup(current.sys_id, 'Software') == false

with this script include:

var UserGroupChecker = Class.create();
UserGroupChecker.prototype = {
    initialize: function() {
    },

    isRequestedByInGroup: function(changeRequestId, groupName) {
        var changeRequest = new GlideRecord('change_request');
        if (changeRequest.get(changeRequestId)) {
            var requestedBy = changeRequest.requested_by;
            if (!requestedBy.nil()) {
                var userGR = new GlideRecord('sys_user');
                if (userGR.get(requestedBy)) {
                    var user = new GlideUser(userGR.sys_id);
                    return user.isMemberOf(groupName);
                }
            }
        }
        return false;
    },

    type: 'UserGroupChecker'
};

[VullankiL]

Still the input required button is not hiding. Please find the attachements and let me know if there is any changes.