reactive-dict.js

import { Meteor } from "meteor/meteor";

Template.mainLayout.onCreated(function () {
  const self = this;
  self.dataDict = new ReactiveDict();
  self.dataDict.set('submitingCreateUserForm', false);
})

"submit #createUserForm": function(e, t) {
  // before calling meteor method
  t.dataDict.set('submitingCreateUserFormngForm', true);
  t.dataDict.set('createUserResponse', false);

  Meteor.call('users.insert', ...params, (err, res) => {
    t.dataDict.set('submitingCreateUserFormngForm', true);
    if (err) {
      // show error to user
    } else {
      // save result in datadict
      t.dataDict.set('createUserResponse', res);
    }
  })
}