angular-docs-cn/public/docs/js/latest/api/pipes/AsyncPipe-class.jade

p.location-badge.
  exported from <a href='../pipes'>angular2/pipes</a>
  defined in <a href="https://github.com/angular/angular/tree/2.0.0-alpha.34/modules/angular2/src/change_detection/pipes/async_pipe.ts#L28-L125">angular2/src/change_detection/pipes/async_pipe.ts (line 28)</a>

:markdown
  Implements async bindings to Observable and Promise.
  
  # Example
  
  In this example we bind the description observable to the DOM. The async pipe will convert an
  observable to the
  latest value it emitted. It will also request a change detection check when a new value is
  emitted.
  
   ```
  @Component({
    selector: "task-cmp",
    changeDetection: ON_PUSH
  })
  @View({
    template: "Task Description {{ description | async }}"
  })
  class Task {
   description:Observable<string>;
  }
  
  ```
  
  
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  h2 Members
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    h3 constructor

    
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        constructor(_ref: ChangeDetectorRef)
    
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    h3 supports

    
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        supports(obj: any)
    
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    h3 onDestroy

    
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        onDestroy()
    
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    h3 transform

    
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        transform(obj: Observable | Promise&lt;any&gt;, args?: any[])
    
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