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‎public/docs/js/latest/api/annotations/Ancestor-var.jade

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.l-main-section
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h2 Ancestor <span class="type">variable</span>
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p.location-badge.
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exported from <a href='../annotations'>angular2/annotations</a>
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:markdown
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‎public/docs/js/latest/api/annotations/Attribute-var.jade

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h2 Attribute <span class="type">variable</span>
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p.location-badge.
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exported from <a href='../annotations'>angular2/annotations</a>
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:markdown
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‎public/docs/js/latest/api/annotations/Component-var.jade

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.l-main-section
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h2 Component <span class="type">variable</span>
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p.location-badge.
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exported from <a href='../annotations'>angular2/annotations</a>
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:markdown
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‎public/docs/js/latest/api/annotations/ComponentAnnotation-class.jade

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exported from <a href='../annotations'>angular2/annotations</a>
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defined in <a href="https://github.com/angular/angular/tree/master/modules/angular2/src/core/annotations_impl/annotations.ts#L778-L1011">angular2/src/core/annotations_impl/annotations.ts (line 778)</a>
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:markdown
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Declare reusable UI building blocks for an application.
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Each Angular component requires a single `@Component` and at least one `@View` annotation. The
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`@Component`
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annotation specifies when a component is instantiated, and which properties and hostListeners it
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binds to.
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When a component is instantiated, Angular
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- creates a shadow DOM for the component.
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- loads the selected template into the shadow DOM.
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- creates a child <a href='../di/Injector-class.html'><code>Injector</code></a> which is configured with the `appInjector` for the
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<a href='Component-var.html'><code>Component</code></a>.
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All template expressions and statements are then evaluated against the component instance.
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For details on the `@View` annotation, see <a href='View-var.html'><code>View</code></a>.
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## Example
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```
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@Component({
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selector: 'greet'
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})
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@View({
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template: 'Hello {{name}}!'
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})
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class Greet {
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name: string;
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constructor() {
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this.name = 'World';
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}
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}
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```
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Dynamically loading a component at runtime:
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Regular Angular components are statically resolved. Dynamic components allows to resolve a
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component at runtime
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instead by providing a placeholder into which a regular Angular component can be dynamically
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loaded. Once loaded,
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the dynamically-loaded component becomes permanent and cannot be changed.
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Dynamic components are declared just like components, but without a `@View` annotation.
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## Example
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Here we have `DynamicComp` which acts as the placeholder for `HelloCmp`. At runtime, the dynamic
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component
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`DynamicComp` requests loading of the `HelloCmp` component.
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There is nothing special about `HelloCmp`, which is a regular Angular component. It can also be
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used in other static
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locations.
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```
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@Component({
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selector: 'dynamic-comp'
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})
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class DynamicComp {
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helloCmp:HelloCmp;
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constructor(loader:DynamicComponentLoader, location:ElementRef) {
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loader.load(HelloCmp, location).then((helloCmp) => {
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this.helloCmp = helloCmp;
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});
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}
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}
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@Component({
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selector: 'hello-cmp'
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})
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@View({
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template: "{{greeting}}"
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})
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class HelloCmp {
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greeting:string;
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constructor() {
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this.greeting = "hello";
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}
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}
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```
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.l-main-section
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h2 Members
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.l-sub-section
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h3 constructor
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pre.prettyprint
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code.
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constructor({selector, properties, events, hostListeners, hostProperties, hostAttributes,
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hostActions, appInjector, lifecycle, hostInjector, viewInjector,
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changeDetection = DEFAULT, compileChildren = true}: {
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selector?: string,
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properties?: List&lt;string&gt;,
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events?: List&lt;string&gt;,
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hostListeners?: StringMap&lt;string, string&gt;,
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hostProperties?: StringMap&lt;string, string&gt;,
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hostAttributes?: StringMap&lt;string, string&gt;,
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hostActions?: StringMap&lt;string, string&gt;,
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appInjector?: List&lt;any&gt;,
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lifecycle?: List&lt;LifecycleEvent&gt;,
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hostInjector?: List&lt;any&gt;,
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viewInjector?: List&lt;any&gt;,
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changeDetection?: string,
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compileChildren?: boolean
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} = {})
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:markdown
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.l-sub-section
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h3 appInjector
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:markdown
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Defines the set of injectable objects that are visible to a Component and its children.
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The `appInjector` defined in the Component annotation allow you to configure a set of bindings
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for the component's
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injector.
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When a component is instantiated, Angular creates a new child Injector, which is configured
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with the bindings in
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the Component `appInjector` annotation. The injectable objects then become available for
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injection to the component
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itself and any of the directives in the component's template, i.e. they are not available to
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the directives which
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are children in the component's light DOM.
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The syntax for configuring the `appInjector` injectable is identical to <a href='../di/Injector-class.html'><code>Injector</code></a>
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injectable configuration.
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See <a href='../di/Injector-class.html'><code>Injector</code></a> for additional detail.
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## Simple Example
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Here is an example of a class that can be injected:
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```
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class Greeter {
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greet(name:string) {
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return 'Hello ' + name + '!';
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}
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}
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@Component({
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selector: 'greet',
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appInjector: [
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Greeter
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]
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})
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@View({
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template: `{{greeter.greet('world')}}!`,
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directives: [Child]
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})
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class HelloWorld {
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greeter:Greeter;
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constructor(greeter:Greeter) {
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this.greeter = greeter;
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}
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}
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```
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.l-sub-section
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h3 changeDetection
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:markdown
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Defines the used change detection strategy.
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When a component is instantiated, Angular creates a change detector, which is responsible for
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propagating
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the component's bindings.
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The `changeDetection` property defines, whether the change detection will be checked every time
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or only when the component
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tells it to do so.
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.l-sub-section
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h3 viewInjector
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:markdown
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Defines the set of injectable objects that are visible to its view dom children.
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## Simple Example
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Here is an example of a class that can be injected:
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```
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class Greeter {
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greet(name:string) {
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return 'Hello ' + name + '!';
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}
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}
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@Directive({
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selector: 'needs-greeter'
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})
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class NeedsGreeter {
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greeter:Greeter;
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constructor(greeter:Greeter) {
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this.greeter = greeter;
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}
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}
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@Component({
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selector: 'greet',
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viewInjector: [
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Greeter
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]
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})
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@View({
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template: `<needs-greeter></needs-greeter>`,
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directives: [NeedsGreeter]
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})
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class HelloWorld {
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}
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```
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‎public/docs/js/latest/api/annotations/Directive-var.jade

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h2 Directive <span class="type">variable</span>
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p.location-badge.
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exported from <a href='../annotations'>angular2/annotations</a>
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:markdown
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