angular-cn/public/docs/js/latest/api/router/CanDeactivate-interface.jade

p.location-badge.
  exported from <a href='../router'>angular2/router</a>
  defined in <a href="https://github.com/angular/angular/tree/2.0.0-alpha.34/modules/angular2/src/router/interfaces.ts#L115-L139">angular2/src/router/interfaces.ts (line 115)</a>

:markdown
  Defines route lifecycle method [canDeactivate], which is called by the router to determine
  if a component can be removed as part of a navigation.
  
  If `canDeactivate` returns or resolves to `false`, the navigation is cancelled.
  
  If `canDeactivate` throws or rejects, the navigation is also cancelled.
  
  ## Example
  ```
  @Directive({
    selector: 'my-cmp'
  })
  class MyCmp implements CanDeactivate {
    canDeactivate(next, prev) {
      return askUserIfTheyAreSureTheyWantToQuit();
    }
  }
   ```
  
  
.l-main-section
  h2 Members
  .l-sub-section
    h3 canDeactivate

    
    pre.prettyprint
      code.
        canDeactivate(nextInstruction: ComponentInstruction, prevInstruction: ComponentInstruction)
    
    :markdown