31 lines
1019 B
Plaintext
31 lines
1019 B
Plaintext
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.l-main-section
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p.location-badge.
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exported from <a href='../router'>angular2/router</a>
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defined in <a href="https://github.com/angular/angular/tree/2.0.0-alpha.36/modules/angular2/src/router/lifecycle_annotations.ts#L41-L43">angular2/src/router/lifecycle_annotations.ts (line 41)</a>
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:markdown
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Defines route lifecycle method [canActivate], which is called by the router to determine
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if a component can be instantiated as part of a navigation.
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Note that unlike other lifecycle hooks, this one uses an annotation rather than an interface.
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This is because [canActivate] is called before the component is instantiated.
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If `canActivate` returns or resolves to `false`, the navigation is cancelled.
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If `canActivate` throws or rejects, the navigation is also cancelled.
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## Example
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```
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@Directive({
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selector: 'control-panel-cmp'
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})
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@CanActivate(() => checkIfUserIsLoggedIn())
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class ControlPanelCmp {
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// ...
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}
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```
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