client script: set assigned to on change assignment group

[wc99]

Hi, I have a requirement, after select an assignment group, one of the members from the group should auto populate. If the assignment group field clear again, the assigned to field will be cleared also. I am new to ServiceNow, and any help is appreciate, thanks! 

function onChange(control, oldValue, newValue, isLoading, isTemplate) {  
         if (isLoading || newValue === '') {
                   return;
         }
        
         var gr = new GlideRecord('sys_user_grmember');
    
  gr.addQuery('group', g_form.getValue('assignment_group'));
         gr.query(function(_gr) {
                   if (_gr.next()) {
                          
        g_form.setValue('assignment_group', _gr.group.toString());
                   }
         });
}

[wc99]

This works perfect, thank you Shishir!