just started component-communication.

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Zhimin(Rex) YE 2016-04-17 21:52:03 +01:00
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This cookbook contains recipes for common component communication scenarios
in which two or more components share information.
本文包含了当两个或多个组件之间需要共享信息时,常见的组件之间的交互方法。
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For an in-depth look at each fundamental concepts in component communication, we can find detailed description and
samples in the [Component Communication]() document.
samples in the [Component Communication]() document.
要深度的了解组件交互的每个基本概念在,我们可以在[组件交互Component Communication]()文档中可以找到详细的描述和例子。
<a id="toc"></a>
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## Table of contents
## 目录
[Pass data from parent to child with input binding](#parent-to-child)
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[Parent and children communicate via a service](#bidirectional-service)
[使用输入Input绑定从父级传数据到子级Pass data from parent to child with input binding](#parent-to-child)
[通过setter截听Input属性值的变化Intercept input property changes with a setter](#parent-to-child-setter)
[使用*ngOnChanges*截听Input属性值的变化Intercept input property changes with *ngOnChanges*](#parent-to-child-on-changes)
[父级监听子级事件Parent listens for child event](#child-to-parent)
[父级与子级通过*本地变量local variable*互动Parent interacts with child via a *local variable*](#parent-to-child-local-var)
[父级调用一个*ViewChild*Parent calls a *ViewChild*](#parent-to-view-child)
[父级和子级通过一个服务来交互Parent and children communicate via a service](#bidirectional-service)
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**See the [live example](/resources/live-examples/cb-component-communication/ts/plnkr.html)**.
**请看[在线例子](/resources/live-examples/cb-component-communication/ts/plnkr.html)**
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<a id="parent-to-child"></a>
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## Pass data from parent to child with input binding
## 通过Input绑定从父级传送数据给子级。
`HeroChildComponent` has two ***input properties***,
typically adorned with [@Input decorations](../guide/template-syntax.html#inputs-outputs).
`HeroChildComponent` 有两个***Input属性***, 通常被[@Input声明](../guide/template-syntax.html#inputs-outputs)装饰
+makeExample('cb-component-communication/ts/app/hero-child.component.ts')
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The second `@Input` aliases the child component property name `masterName` as `'master'`.
第二个`@Input`是为子组件的属性名`masterName`起别名为`master`.
The `HeroParentComponent` nests the child `HeroChildComponent` inside an `*ngFor` repeater,
binding its `master` string property to the child's `master` alias
and each iteration's `hero` instance to the child's `hero` property.
父级`HeroParentComponent`把子级 `HeroChildComponent`放到一个 `*ngFor`循环器中,把子级的`master`字符串属性绑定到子级的`master`别名上,并把每个循环的`hero`实例绑定到子级的`hero`属性。
+makeExample('cb-component-communication/ts/app/hero-parent.component.ts')
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The running application displays three heroes:
运行的应用程序显示三个英雄:
figure.image-display
img(src="/resources/images/cookbooks/component-communication/parent-to-child.png" alt="Parent-to-child")

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The `ngIf` "conditional element" directive and the `ngFor` "repeater" directive are
good examples in this category.
`ngIf`"有条件的元素conditional element"指令和 `ngFor` "中继器repeater"指令是很好的结构型指令。
`ngIf`"有条件的元素conditional element"指令和 `ngFor` "循环器repeater"指令是很好的结构型指令。
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