angular-cn/public/docs/js/latest/api/directives/Switch-class.jade

p.location-badge.
  exported from <a href="/angular2/directives">angular2/directives</a>
  defined in <a href="https://github.com/angular/angular/tree/master/modules/angular2/src/directives/switch.js#L39">angular2/src/directives/switch.js (line 39)</a>

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  The `Switch` directive is used to conditionally swap DOM structure on your template based on a
  scope expression.
  Elements within `Switch` but without `SwitchWhen` or `SwitchDefault` directives will be
  preserved at the location as specified in the template.
  
  `Switch` simply chooses nested elements and makes them visible based on which element matches
  the value obtained from the evaluated expression. In other words, you define a container element
  (where you place the directive), place an expression on the **`[switch]="..."` attribute**),
  define any inner elements inside of the directive and place a `[switch-when]` attribute per
  element.
  The when attribute is used to inform Switch which element to display when the expression is
  evaluated. If a matching expression is not found via a when attribute then an element with the
  default attribute is displayed.
  
  # Example:
  
  ```
  <ANY [switch]="expression">
    <template [switch-when]="whenExpression1">...</template>
    <template [switch-when]="whenExpression1">...</template>
    <template [switch-default]>...</template>
  </ANY>
  ```
  
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