aurelia-async-binding

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aurelia-async-binding

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Aurelia async bindingbehavior to consume Observables and Promises

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# aurelia-async-binding

[![npm Version](https://img.shields.io/npm/v/aurelia-async-binding.svg)](https://www.npmjs.com/package/aurelia-async-binding)
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An Aurelia binding behavior to consume async streams and promises directly from within your templates.

## Install
Install the npm dependency via

```bash
npm install aurelia-async-binding
```

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

```typescript
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:

```typescript
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);
  }
}
```

```html
<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

aurelia-async-binding

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