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rx-handler-decorator

v0.0.0-alpha.0

Published

A decorator for making an RxJS 5 Subject into a handler for user events

Downloads

6

Readme

rx-handler-decorator

A decorator for making an RxJS 5 Subject into a handler for user events

Installation

npm i -S rx-handler-decorator

Usage

By decorating any property that returns a Subject (or BehaviorSubject, et al) with @rxHandler, it converts that property into a handler function, that also has all of the methods of the original subject reference.

This can be used in any framework or environment that might require this behavior. It also automatically binds the handler function to the reference, so there's no need to use something like .bind() or core-decorators autobind on the resulting handler method.

Angular 2 Basic Example

import { Component } from 'angular/core';
import { rxHandler } from 'rx-handler-decorator';
import * as Rx from 'rxjs';

@Component({
    selector: 'my-app',
    template: `<div>
      <button (click)="clicks()">Click Me</button>
      <div>count: {{count | async}}</div>
    </div>`
})
class MyComponent {
  @rxHandler
  clicks = new Rx.Subject();

  get count() {
    return this.clicks
      .scan(x => x + 1, 0);
  }
}

React.js Basic Example

import * as React from 'react';
import * as Rx from 'rxjs';
import { rxHandler } from 'rx-handler-decorator';

class MyComponent extends React.Component {
  constructor(props) {
    super(props);
    this.state = { count: 0 };
  }

  componentDidMount() {
    this.sub = this.clicks
      .scan(x => x + 1, 0)
      .subscribe(count => this.setState({ count }));
  }

  componentWillUnmount() {
    this.sub.unsubscribe();
  }

  // convert the `clicks` property to a function-subject!
  @rxHandler
  clicks = new Rx.Subject();

  render() {
    // now we can use `{this.clicks}` directly as a handler
    return (<div>
      <button onClick={this.clicks}>Click Me</button>
      <div>count: {this.state.count}</div>
    </div>);
  }
}