discourse-custom-wizard/assets/javascripts/wizard/components/validator.js.es6

import Component from "@ember/component";
import { not } from "@ember/object/computed";
import { ajax } from "discourse/lib/ajax";
import { getToken } from "wizard/lib/ajax";

export default Component.extend({
    classNameBindings: ['isValid', 'isInvalid'],
    validMessageKey: null,
    invalidMessageKey: null,
    isValid: null,
    isInvalid: not('isValid'),
    layoutName: 'components/validator', // useful for sharing the template with extending components
    init() {
      this._super(...arguments);

      if (this.get('validation.backend')) {
        // set a function that can be called as often as it need to
        // from the derived component
        this.backendValidate = (params) => {
          return ajax('/realtime_validations', {
            data: {
                validation: this.get('name'),
                authenticity_token: getToken(),
                ...params
            }
          });
        }

      }
    },

    didInsertElement() {
      this.appEvents.on('custom-wizard:validate', this, this.checkIsValid);
    },

    willDestroyElement() {
      this.appEvents.off('custom-wizard:validate', this, this.checkIsValid);
    },

    checkIsValid() {
      this.set('isValid', this.validate());
    }
});