API data is failing to display in memory, appearing only after subsequent clicks or page loads instead of the initial interaction

Recently, I completed the transfer of my data from mock data to in-memory storage. Everything appeared to be functioning smoothly until I clicked on a button responsible for generating various fields based on the data. To my surprise, these fields showed up completely empty.

app.module.ts


// Import statements omitted for brevity

@NgModule({
  declarations: [
    AppComponent,
    SimXesComponent,
    SimXComponent,
    SimXDetailsComponent
  ],
  imports: [
    BrowserModule,
    FormsModule,
    HttpModule,
    InMemoryWebApiModule.forRoot(InMemoryDataService),
    AppRoutingModule
  ],
  providers: [
    SimXService
  ],
  bootstrap: [AppComponent]
})
export class AppModule { }

simx.component.html


<!-- HTML code snippets omitted for brevity -->

in-memory-data.service


import { InMemoryDbService } from 'angular-in-memory-web-api';
// Other import statements omitted

export class InMemoryDataService implements InMemoryDbService {
  createDb() {
    // Data structure definitions and sample values omitted for clarity
    return { simxes, s_onedsliders, s_twodsliders, s_switches, s_output };
  }
}

simx.component.ts


// Component logic and methods omitted for brevity

simx.ts


export class SimX {
  id: number;
  title: string;
  num_onedsliders: number;
  // Other attributes omitted
}

During my troubleshooting attempts, I observed some unusual behavior with the console logs. Initially, all the in-memory variables were returning as undefined when logged (as seen in simx.component.ts). However, upon clicking the button again, the output changed to [object object], displaying the details from the in-memory service data. This inconsistency has left me puzzled. What could be causing this strange phenomenon?

Answer №1

Your service implementation is not visible, but I can assume that you are utilizing the in-memory web API, which means your retrieval methods must be asynchronous.

It seems like the behavior is different because the values will remain undefined until they are retrieved, unlike hard-coded data which is readily available.

If you're interested, I have a sample CRUD using the in-memory web API for reference: https://github.com/DeborahK/Angular2-ReactiveForms/tree/master/APM-Updated

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