Use resolve example

admin.routing.ts

import { NgModule } from '@angular/core';
import { Routes, RouterModule } from '@angular/router';

import { CmsResolver } from '../../resolvers/cms.resolver';
import { AdminComponent } from './admin.component';
import { CmsComponent } from './cms/cms.component';

export const routes: Routes = [

  {
    path: '',
    component: AdminComponent,
    data: {
      title: 'Admin'
    }
  },
  {
    path: 'cms',
    component: CmsComponent,
    resolve: {
      cmsResources: CmsResolver
    },
    data: {
      title: 'CMS'
    }
  }
];

@NgModule({
  imports: [RouterModule.forChild(routes)],
  exports: [RouterModule],
  providers: [ CmsResolver ]
})
export class AdminRoutingModule {
}