okto-viewmodel

How to use it

• Create a viewmodel

import { ViewModel, Refresh } from "okto-viewmodel";

@ViewModel.nameAs("Vegeta")
export class VegetaViewModel extends ViewModel {
  constructor(@inject(IUserRetriever) private retriever: IUserRetriever) {
    super();
    retriever.retrieve().then(user => setUser(user))
  }

  private counter: number = 0;
  
  @Refresh
  private setUser(user: User) {
    this.user = user;
  }

  public get value(): number {
    return this.counter;
  }

  // The Refresh decorator let the component re-rendering when the function is called
  @Refresh
  increase() {
    this.counter++;
  }

  isOver9000(): boolean {
    return this.counter >= 9000;
  }
}

• Create a component

  • or using the useViewmodel hook

  import * as React from "react";
  import { useViewmodel } from "okto-viewmodel";
  
  import { VegetaViewModel } from "./VegetaViewModel";
  
  export const VegetaComponent = function () {
    const viewmodel = useViewmodel(VegetaViewModel);
  
    return <div>
        <h2>Counter {viewmodel.value}</h2>
        {viewmodel.isOver9000() && <h1>OVER</h1>}
        <button onClick={React.useCallback(() => viewmodel.increase(), [])}>Increase</button>
    </div>
  }

  • or extends the View component factory

  import * as React from "react";
  import { View } from "okto-viewmodel";
  
  import { VegetaViewModel } from "./VegetaViewModel";
  
  export class VegetaComponent extends View(VegetaViewModel) {
    render() {
      const {viewmodel} = this;
        
      return <div>
          <h2>Counter {viewmodel.value}</h2>
          {viewmodel.isOver9000() && <h1>IS OVER 9000!</h1>}
          <button onClick={React.useCallback(() => viewmodel.increase(), [])}>Increase</button>
      </div>
    }
  }

• Create a module and register the viewmodel in it.

import { interfaces } from "inversify";
import { IViewModelsModule } from "okto-viewmodel";
import { IModule, IViewModelRegistry } from "okto-core";

import { VegetaViewModel } from './VegetaViewModel';

export class MainModule implements IModule, IViewModelsModule {
 modules(container: interfaces.Container): void { 
    /* Here you can bind services into the IOC container
    **
    ** es.
    ** container.bind<ISimpleService>(ISimpleService).to(SimpleService);
    **
    ** For more info check the inversifyJs documentation
    */
  }

  viewmodels(registry: IViewModelRegistry): void {
    registry.add(VegetaViewModel);
  }
}

• Register and run the app

import "reflect-metadata";
import * as React from "react";
import { Application } from "okto-core";
import { ViewModelModule } from "okto-viewmodel";

import { MainModule } from './MainModule';
import { VegetaComponent } from "./VegetaComponent";

const app = new Application();
app.register(new ViewModelModule());

app.register(new MainModule());

// Here you can add as many Module as you want :)

app.run(() => <VegetaComponent />);