vue-rx

vue-rx

Simple RxJS binding for Vue.js. It also supports subscriptions for generic observables that implement the .subscribe and .unsubscribe (or .dispose) interface. For example, you can use it to subscribe to most.js or Falcor streams, but some features require RxJS to work.

Installation

NPM + ES2015

npm install vue vue-rx rxjs --save

import Vue from 'vue'
import Rx from 'rxjs/Rx'
import VueRx from 'vue-rx'

// tada!
Vue.use(VueRx, Rx)

Tips for Reducing Bundle Size

In most cases, you probably don't need the full build of Rx. You can reduce the amount of code included in your bundle by doing the following:

import Vue from 'vue'
import VueRx from 'vue-rx'
import { Observable } from 'rxjs/Observable'
import { Subscription } from 'rxjs/Subscription' // Disposable if using RxJS4

// tada!
Vue.use(VueRx, { Observable, Subscription })

Global Script

Just make sure to include vue-rx.js after Vue.js and RxJS. It will be installed automatically.

Usage

// provide Rx observables with the `subscriptions` option
new Vue({
  el: '#app',
  subscriptions: {
    msg: messageObservable
  }
})

<!-- bind to it normally in templates -->
<div>{{ msg }}</div>

The subscriptions options can also take a function so that you can return unique observables for each component instance:

Vue.component('foo', {
  subscriptions: function () {
    return {
      msg: Rx.Observable.create(...)
    }
  }
})

The observables are exposed as vm.$observables:

var vm = new Vue({
  subscriptions: {
    msg: messageObservable
  }
})

vm.$observables.msg.subscribe(msg => console.log(msg))

$watchAsObservable(expOrFn, [options])

This feature requires RxJS.

This is a prototype method added to instances. You can use it to create an observable from a value watcher. The emitted value is in the format of { newValue, oldValue }:

var vm = new Vue({
  data: {
    a: 1
  },
  subscriptions () {
    // declaratively map to another property with Rx operators
    return {
      aPlusOne: this.$watchAsObservable('a')
        .pluck('newValue')
        .map(a => a + 1)
    }
  }
})

// or produce side effects...
vm.$watchAsObservable('a')
  .subscribe(
    ({ newValue, oldValue }) => console.log('stream value', newValue, oldValue),
    err => console.error(err),
    () => console.log('complete')
  )

The optional options object accepts the same options as vm.$watch.

$subscribeTo(observable, next, error, complete)

This is a prototype method added to instances. You can use it to subscribe to an observable, but let VueRx manage the dispose/unsubscribe.

var vm = new Vue({
  mounted () {
    this.$subscribeTo(Rx.Observable.interval(1000), function (count) {
      console.log(count)
    })
  }
})

$fromDOMEvent(selector, event)

This feature requires RxJS.

This is a prototype method added to instances. Use it to create an observable from DOM events within the instances' element. This is similar to Rx.Observable.fromEvent, but usable inside the subscriptions function even before the DOM is actually rendered.

selector is for finding descendant nodes under the component root element, if you want to listen to events from root element itself, pass null as first argument.

var vm = new Vue({
  subscriptions () {
    return {
      inputValue: this.$fromDOMEvent('input', 'keyup').pluck('target', 'value')
    }
  }
})

Caveats

You cannot use the watch option to watch subscriptions, because it is processed before the subscriptions are set up. But you can use $watch in the created hook instead.

Example

See /examples for some simple examples.

License

MIT