# MdSnackBar
`MdSnackBar` is a service, which opens snack bar notifications in the view.

### Methods

| Name |  Description |
| --- | --- |
| `open(message: string, actionLabel: string, config: MdSnackBarConfig): MdSnackBarRef<SimpleSnackBar>` | Creates and opens a simple snack bar notification matching material spec. |
| `openFromComponent(component: ComponentType<T>, config: MdSnackBarConfig): MdSnackBarRef<T>` | Creates and opens a snack bar notification with a custom component as content. |

### Config

| Key |  Description |
| --- | --- |
| `viewContainerRef: ViewContainerRef` | The view container ref to attach the snack bar to. |
| `role: AriaLivePoliteness = 'assertive'` | The politeness level to announce the snack bar with. |
| `announcementMessage: string` | The message to announce with the snack bar. |
| `duration: number` | The length of time in milliseconds to wait before autodismissing the snack bar. |


### Example
The service can be injected in a component.
```ts
@Component({
  selector: 'my-component',
  providers: [MdSnackBar]
})
export class MyComponent {

 constructor(snackBar: MdSnackBar) {}

 failedAttempt() {
   this.snackBar.open('It didn\'t quite work!', 'Try Again');
 }

}
```