fix: 错译：不仅改为仅仅
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Zhicheng Wang
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66e640a948
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398d887f11
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@ -423,7 +423,7 @@ a#tree-shaking
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which in turn makes more of the application "tree shakable".
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摇树优化和AOT编译是单独的步骤。
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摇树优化不仅针对JavaScript代码。
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摇树优化仅仅针对JavaScript代码。
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AOT编译会把应用中的大部分都转换成JavaScript，这种转换会让应用更容易被“摇树优化”。
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a#rollup
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@ -3,124 +3,208 @@ include ../_util-fns
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:marked
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Component templates are not always fixed. An application may need to load new components at runtime.
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组件的模板不会永远是固定的。应用可能会需要在运行期间加载一些新的组件。
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This cookbook shows you how to use `ComponentFactoryResolver` to add components dynamically.
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这本烹饪书为你展示如何使用`ComponentFactoryResolver`来动态添加组件。
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<a id="toc"></a>
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:marked
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# Contents
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# 目录
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* [Dynamic component loading](#dynamic-loading)
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[动态组件加载](#dynamic-loading)
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* [The directive](#directive)
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[指令](#directive)
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* [Loading components](#loading-components)
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[加载组件](#loading-components)
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* [Resolving Components](#resolving-components)
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[解析组件](#resolving-components)
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* [Selector References](#selector-references)
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[通过选择器引用](#selector-references)
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* [A common _AdComponent_ interface](#common-interface)
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[通用的`AdComponent`接口](#common-interface)
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* [Final ad banner](#final-ad-banner)
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[最终的广告Banner](#final-ad-banner)
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:marked
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See the <live-example name="cb-dynamic-component-loader"></live-example>
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of the code in this cookbook.
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到<live-example name="cb-dynamic-component-loader"></live-example>查看本烹饪书的源码。
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.l-main-section
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<a id="dynamic-loading"></a>
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:marked
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## Dynamic component loading
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## 动态组件加载
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The following example shows how to build a dynamic ad banner.
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下面的例子展示了如何构建动态广告条。
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The hero agency is planning an ad campaign with several different
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ads cycling through the banner. New ad components are added
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frequently by several different teams. This makes it impractical
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to use a template with a static component structure.
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英雄管理局正在计划一个广告活动，要在广告条中显示一系列不同的广告。几个不同的小组可能会频繁加入新的广告组件。
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再用只支持静态组件结构的模板显然是不现实的。
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Instead, you need a way to load a new component without a fixed
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reference to the component in the ad banner's template.
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我们需要一种新的组件加载方式，它不需要在广告条组件的模板中引用固定的组件。
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Angular comes with its own API for loading components dynamically.
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Angular 自带的API就能支持动态加载组件。
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.l-main-section
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<a id="directive"></a>
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:marked
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## The directive
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## 指令
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Before you can add components you have to define an anchor point
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to tell Angular where to insert components.
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在添加组件之前，先要定义一个锚点来告诉Angular要把组件插入到什么地方。
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The ad banner uses a helper directive called `AdDirective` to
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mark valid insertion points in the template.
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广告条使用一个名叫`AdDirective`的辅助指令来在模板中标记出有效的插入点。
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+makeExample('cb-dynamic-component-loader/ts/src/app/ad.directive.ts',null,'src/app/ad.directive.ts')(format='.')
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:marked
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`AdDirective` injects `ViewContainerRef` to gain access to the view
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container of the element that will host the dynamically added component.
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`AdDirective`注入了`ViewContainerRef`来获取对容器视图的访问权，这个容器就是那些动态加入的组件的宿主。
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In the `@Directive` decorator, notice the selector name, `ad-host`;
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that's what you use to apply the directive to the element.
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The next section shows you how.
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在`@Directive`装饰器中，要注意选择器的名称：`ad-host`，它就是我们将应用到元素上的指令。下一节我们会展示如何做。
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.l-main-section
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<a id="loading-components"></a>
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:marked
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## Loading components
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## 加载组件
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Most of the ad banner implementation is in `ad-banner.component.ts`.
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To keep things simple in this example, the HTML is in the `@Component`
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decorator's `template` property as a template string.
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广告条的大部分实现代码都在`ad-banner.component.ts`中。
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为了让这个例子简单点，我们把HTML直接放在了`@Component`装饰器的`template`属性中。
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The `<ng-template>` element is where you apply the directive you just made.
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To apply the `AdDirective`, recall the selector from `ad.directive.ts`,
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`ad-host`. Apply that to `<ng-template>` without the square brackets. Now Angular knows
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where to dynamically load components.
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`<ng-template>`元素就是刚才制作的指令将应用到的地方。
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要应用`AdDirective`，回忆一下来自`ad.directive.ts`的选择器`ad-host`。把它应用到`<ng-template>`（不用带方括号）。
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这下，Angular就知道该把组件动态加载到哪里了。
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+makeExample('cb-dynamic-component-loader/ts/src/app/ad-banner.component.ts', 'ad-host' ,'src/app/ad-banner.component.ts (template)')(format='.')
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:marked
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The `<ng-template>` element is a good choice for dynamic components
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because it doesn't render any additional output.
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`<ng-template>`元素是动态加载组件的最佳选择，因为它不会渲染任何额外的输出。
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a#resolving-components
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:marked
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### Resolving components
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### 解析组件
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Take a closer look at the methods in `ad-banner.component.ts`.
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深入看看`ad-banner.component.ts`中的方法。
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`AdBannerComponent` takes an array of `AdItem` objects as input,
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which ultimately comes from `AdService`. `AdItem` objects specify
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the type of component to load and any data to bind to the
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component.`AdService` returns the actual ads making up the ad campaign.
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`AdBannerComponent`接收一个`AdItem`对象的数组作为输入，它最终来自`AdService`。
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`AdItem`对象指定要加载的组件类，以及绑定到该组件上的任意数据。
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`AdService`可以返回广告活动中的那些广告。
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Passing an array of components to `AdBannerComponent` allows for a
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dynamic list of ads without static elements in the template.
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给`AdBannerComponent`传入一个组件数组可以让我们在模板中放入一个广告的动态列表，而不用写死在模板中。
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With its `getAds()` method, `AdBannerComponent` cycles through the array of `AdItems`
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and loads a new component every 3 seconds by calling `loadComponent()`.
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通过`getAds()`方法，`AdBannerComponent`可以循环遍历`AdItems`的数组，并且每三秒调用一次`loadComponent()`来加载新组件。
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+makeExample('cb-dynamic-component-loader/ts/src/app/ad-banner.component.ts', 'class' ,'src/app/ad-banner.component.ts (excerpt)')(format='.')
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:marked
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The `loadComponent()` method is doing a lot of the heavy lifting here.
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Take it step by step. First, it picks an ad.
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这里的`loadComponent()`方法很重要。
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我们来一步步看看。首先，它选取了一个广告。
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.l-sub-section
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:marked
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**How _loadComponent()_ chooses an ad**
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**`loadComponent()`如何选择广告**
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The `loadComponent()` method chooses an ad using some math.
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`loadComponent()`方法使用某种算法选择了一个广告。
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First, it sets the `currentAddIndex` by taking whatever it
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currently is plus one, dividing that by the length of the `AdItem` array, and
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using the _remainder_ as the new `currentAddIndex` value. Then, it uses that
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value to select an `adItem` from the array.
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（译注：循环选取算法）首先，它把`currentAddIndex`递增一，然后用它除以`AdItem`数组长度的*余数*作为新的`currentAddIndex`的值，
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最后用这个值来从数组中选取一个`adItem`。
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:marked
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After `loadComponent()` selects an ad, it uses `ComponentFactoryResolver`
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to resolve a `ComponentFactory` for each specific component.
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The `ComponentFactory` then creates an instance of each component.
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在`loadComponent()`选取了一个广告之后，它使用`ComponentFactoryResolver`来为每个具体的组件解析出一个`ComponentFactory`。
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然后`ComponentFactory`会为每一个组件创建一个实例。
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Next, you're targeting the `viewContainerRef` that
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exists on this specific instance of the component. How do you know it's
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this specific instance? Because it's referring to `adHost` and `adHost` is the
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@ -157,13 +241,13 @@ a#common-interface
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Here are two sample components and the `AdComponent` interface for reference:
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+makeTabs(
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`cb-dynamic-component-loader/ts/src/app/hero-job-ad.component.ts,
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cb-dynamic-component-loader/ts/src/app/hero-profile.component.ts,
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cb-dynamic-component-loader/ts/src/app/ad.component.ts`,
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null,
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`hero-job-ad.component.ts,
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hero-profile.component.ts,
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ad.component.ts`
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`cb-dynamic-component-loader/ts/src/app/hero-job-ad.component.ts,
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cb - dynamic - component - loader / ts / src / app / hero - profile.component.ts,
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cb - dynamic - component - loader / ts / src / app / ad.component.ts`,
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null,
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`hero-job-ad.component.ts,
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hero - profile.component.ts,
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ad.component.ts`
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)
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a#final-ad-baner
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