Make sure to wait for the store to finish updating the data before accessing it. Utilize RxJS and Angular

Greetings! I am currently working with Angular and RxJS, and I'm trying to find a solution to wait for the store's data to be updated after an action is dispatched in order to perform some operations using that data. Below you can see a snippet of my relevant code in the component.ts file:

  ngOnInit() {
  // Subscribe to the store and retrieve data from it
   this.store.pipe(select(selectors.getDataSelector)).pipe(takeUntil(this.destroy$)).subscribe(x => {
      this.data$ = x;
    });
  }

  updateData() {
    this.store.dispatch(new actions.getDataAction());
    // This action triggers an HTTP request, stores the fetched data in the store which can be accessed via getDataSelector

    // Now I need to implement a condition that checks if the store data has finished updating after the action, and then proceed to do something
    if(/* Condition */) {
      // Perform operations with this.data$
    }
  }

Answer №1

Instead of reacting in the updateData function, it is better to handle it in a tap operator like this:

  ngOnInit() {

   // Avoid piping multiple times as done previously
   this.store.pipe(
     select(selectors.getDataSelector),
     takeUntil(this.destroy$),
     tap((data) => this.bar())
   )
   .subscribe((data) => {
     this.data$ = data;
   });
  }

  updateData() {
    this.store.dispatch(new actions.getDataAction());
  }

  bar() {
    // handle side effects here
  }

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