Creating a Reactive Subscription in Vue with vue-rx and RxJS

Описание: Learn how to effectively manage HTTP requests in Vue using `vue-rx` and `RxJS`, combining the power of observables with Vue's reactivity.
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This video is based on the question https://stackoverflow.com/q/64330519/ asked by the user 'peter.kormos' ( https://stackoverflow.com/u/10659616/ ) and on the answer https://stackoverflow.com/a/64338513/ provided by the user 'Mrk Sef' ( https://stackoverflow.com/u/13500986/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Managing HTTP Requests in Vue with vue-rx and RxJS

In modern web development, managing asynchronous data flows is crucial, especially when it comes to making HTTP requests. If you're using Vue combined with reactive programming via vue-rx and RxJS, you might face some challenges. One common scenario is creating a subscription to a prop value and triggering an HTTP request at regular intervals. Let's delve into how to accomplish this efficiently.

The Problem at Hand

You have a prop started that dictates whether an HTTP request should be sent at intervals of 500 milliseconds. The requests should stop if the prop turns false, or if the HTTP response returns a status indicating 'COMPLETED'. Here’s a simplified outline of what you want your implementation to look like:

When started is true, send an HTTP request every 500 milliseconds.

Stop sending requests when started is false or when the returned status is 'COMPLETED'.

Crafting the Solution

Step 1: Setting Up Your Component

First, ensure that your Vue component is set up correctly. You will need to define the started prop and set up the subscriptions for handling the data flow.

[[See Video to Reveal this Text or Code Snippet]]

Step 2: Breaking Down the Implementation

Let’s break down the main components of the implementation:

Watching the Prop:
The this.$watchAsObservable('started') method watches the started prop, producing an observable stream of its value changes (true or false).

Transforming the Stream:

pluck('newValue') allows us to extract the new value each time the prop changes.

map(val => val ? timer(0, 500) : EMPTY) creates an observable that emits values at a specified interval only if started is true. If false, it emits an EMPTY observable (a placeholder that emits nothing).

Handling HTTP Requests:

The switchMap(timer$ => timer$.pipe(...)) allows us to switch to a new observable (the timer) when the started prop is toggled.

Inside the timer observable, it makes calls to this.callHttpRequest() at each interval.

Controlling Request Lifecycle:

The takeWhile(result => result.status !== 'COMPLETED') operator ensures that we only continue to make requests while the result status is not 'COMPLETED'. Once the condition is satisfied, it unsubscribes automatically to prevent further HTTP calls.

Conclusion

By implementing this reactive approach with vue-rx and RxJS, you can efficiently manage intervals and HTTP requests based on a prop's value. This method not only simplifies your code but also enhances performance and responsiveness in your Vue application.

Feel free to experiment with the code and make adjustments as necessary to fit the specific needs of your project. Happy coding!