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mobx&mobx angular:如何从存储更新和订阅更新的值?

angular-state-managmement mobx angular

1

micronyks · 技术社区 · 7 年前

mobx 和 mobx-angular (您可以在dependency中看到)。我来自ngrx,ngxs的背景,所以很难理解mobx流,因为它或多或少 angular-service

存储.ts

@Injectable()
export class Store {

    @observable counter: number = 0;

    constructor() { }

    @action count() {
        this.counter ++;
    }
}

应用组件.ts

export class AppComponent  {

  _counter:number=0;

  constructor(private store:Store){}

  ngOnInit(){
    // how to subscribe to updated value of counter from service and assign it to this._counter ????

    this._counter = this.store.counter;
  }
}

应用程序组件.html

    <div *mobxAutorun>Counter : {{store.counter}}<br /></div>

______________________________________________

<div>Counter : {{store.counter}}<br /></div>

______________________________________________


<div>how to subscribe to updated value form 'counter' variable to '_counter' local variable????</div><br />

<div> {{_counter}} </div>

<button (click)="store.count()">Count</button>

1 回复 | 直到 7 年前

1

2

Richard Matsen 7 年前

您可以在中设置RxJs订阅 ngOnInit

ngOnInit() {
  this.store.toRx(this.store, 'counter')
    .subscribe(val => this._counter = val)
}

toRx 是一个方便的功能,可以添加到商店。
它使用Mobx observe() 函数,每次指定项更改时只激活回调。

import { Injectable } from '@angular/core';
import { action, observable, observe } from 'mobx';
import { Observable } from 'rxjs';

@Injectable()
export class Store {
  ...
  toRx(obj, prop) {
    return Observable.create(observer =>
      observe(obj, prop, (change) => observer.next(change.newValue), true)
    );
  }
}

如果您有要订阅的深度嵌套属性,例如

@Injectable()
export class Store {
  ...    
  @observable counterWrapper = { counter: 0 };

只需更改 梅花

this.store.toRx(this.store.counterWrapper, 'counter')
  .subscribe(val => this._counter = val)