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aurelia-async-binding

Aurelia async bindingbehavior to consume Observables and Promises

2.0.1
latest
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npm
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24
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Maintainers
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aurelia-async-binding

npm Version Join the chat at https://gitter.im/aurelia/discuss CircleCI Coverage Status

An Aurelia binding behavior to consume async streams and promises directly from within your templates.

Install

Install the npm dependency via

npm install aurelia-async-binding

Configuration

In your main.ts you'll have to register the plugin which makes it globally available:

import {Aurelia} from 'aurelia-framework'
import environment from './environment';

export function configure(aurelia: Aurelia) {
  aurelia.use
    .standardConfiguration()
    .feature('resources');

  ...

  aurelia.use.plugin("aurelia-async-binding");  // <----- REGISTER THE PLUGIN

  aurelia.start().then(() => aurelia.setRoot());
}

Features

  • Easily access streamed values
  • Pluck complex object properties
  • Deep-plucking to access nested complex object properties using the dot-notation
  • Register completedHandler for once the stream completes
  • Register error handlers to react on streamed errors

Usage

Once the plugin is installed and configured you can use the async binding behavior. An example VM and View can be seen below:

import { Observable } from 'rxjs/Observable';
import "rxjs/add/operator/map";
import "rxjs/add/operator/take";
import "rxjs/add/observable/interval";
import "rxjs/add/observable/of";
import "rxjs/add/observable/from";

interface SPAFramework {
  label: string;
  url: string;
}
export class App {
  public frameworks: Observable<SPAFramework[]>;
  public frameworkOverTime: Observable<SPAFramework>;
  public isSequenceDone: boolean = false;

  constructor() {
    const data: SPAFramework[] = [
      { label: "Aurelia", url: "http://aurelia.io" },
      { label: "Angular v4", url: "http://angular.io" },
      { label: "React", url: "https://facebook.github.io/react/" },
    ];

    this.frameworks = Observable.of(data);

    this.frameworkOverTime = Observable.interval(2000)
      .map((idx) => data[idx])
      .take(data.length);
  }

  public completedHandler = () => {
    setTimeout(() => this.isSequenceDone = true, 2000);
  }
}
<template>
  <h1>SPA Frameworks</h1>
  <ul>
    <li repeat.for="framework of frameworks & async">
      <a href="${framework.url}">${framework.label}</a>
    </li>
  </ul>

  <h1>Frameworks streamed (plucked property)</h1>
  <div>
      ${frameworkOverTime & async: { property: 'label' }}
  </div>

  <h1>Frameworks streamed (with binding, completed handler)</h1>
  <div with.bind="frameworkOverTime & async: { completed: completedHandler }">
    <a if.bind="!isSequenceDone" href="${url}">${label}</a>
    <span if.bind="isSequenceDone">Sequence is done!</span>
  </div>
</template>

Acknowledgement

Thanks goes to Dwayne Charrington for his Aurelia-TypeScript starter package https://github.com/Vheissu/aurelia-typescript-plugin

Keywords

rxjs

FAQs

Package last updated on 22 Sep 2022

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