2016-04-10 09:14:24 -04:00
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include ../_util-fns
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a(id='top')
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:marked
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2017-04-12 15:08:44 -04:00
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Your app should be able to make the browser title bar say whatever you want it to say.
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2016-04-10 09:14:24 -04:00
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This cookbook explains how to do it.
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2016-05-07 18:20:40 +01:00
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2016-05-22 19:26:23 +08:00
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应用程序应该能让浏览器标题栏显示我们想让它显示的内容。本*烹饪宝典*解释怎么做。
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2016-04-10 09:14:24 -04:00
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:marked
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2017-04-12 15:08:44 -04:00
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See the <live-example name="cb-set-document-title"></live-example>.
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2016-11-28 21:23:28 -08:00
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2017-04-23 09:34:51 +08:00
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**参见<live-example name="cb-set-document-title"></live-example>**。
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2017-02-26 15:04:21 +08:00
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2016-11-28 21:23:28 -08:00
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table
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tr
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td
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:marked
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To see the browser title bar change in the live example,
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open it again in the Plunker editor by clicking the icon in the upper right,
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then pop out the preview window by clicking the blue 'X' button in the upper right corner.
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2017-02-26 15:04:21 +08:00
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要在在线例子中看到浏览器标题的变化，请点击右上角的图标在Plunker编辑器中打开它，然后点击预览窗口右上角的蓝色'X'按钮，弹出窗口。
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2016-11-28 21:23:28 -08:00
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td
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img(src='/resources/images/devguide/plunker-switch-to-editor-button.png' width="200px" height="70px" alt="pop out the window" align="right" )
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br
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img(src='/resources/images/devguide/plunker-separate-window-button.png' width="200px" height="47px" alt="pop out the window" align="right" )
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2016-04-10 09:14:24 -04:00
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:marked
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## The problem with *<title>*
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2016-05-07 18:20:40 +01:00
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## *<title>*的问题
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2016-04-10 09:14:24 -04:00
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The obvious approach is to bind a property of the component to the HTML `<title>` like this:
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2016-05-07 18:20:40 +01:00
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2016-05-18 11:38:10 +08:00
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显而易见的方法是把组件的属性绑定到HTML的`<title>`标签上，像这样：
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2016-05-15 23:00:09 +01:00
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2016-04-10 09:14:24 -04:00
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code-example(format='')
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<title>{{This_Does_Not_Work}}</title>
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2017-04-15 18:48:44 +08:00
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2016-04-10 09:14:24 -04:00
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:marked
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2016-08-06 07:45:32 +01:00
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Sorry but that won't work.
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2017-04-12 15:08:44 -04:00
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The root component of the application is an element contained within the `<body>` tag.
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2016-04-10 09:14:24 -04:00
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The HTML `<title>` is in the document `<head>`, outside the body, making it inaccessible to Angular data binding.
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2016-05-07 18:20:40 +01:00
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2016-05-18 11:38:10 +08:00
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抱歉，这样不行。我们应用程序的根组件是一个包含在`<body>`标签里的元素。该HTML的`<title>`在文档的`<head>`元素里，在`<body>`之外，Angular的数据绑定无法访问到它。
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2016-04-10 09:14:24 -04:00
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2017-04-12 15:08:44 -04:00
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You could grab the browser `document` object and set the title manually.
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That's dirty and undermines your chances of running the app outside of a browser someday.
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2016-05-07 18:20:40 +01:00
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2016-06-20 12:29:43 +01:00
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可以从浏览器获得`document`对象，并且手动设置标题。但是这样看起来很脏，而且将无法在浏览器之外运行应用程序。
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2016-05-15 23:00:09 +01:00
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2016-04-10 09:14:24 -04:00
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.l-sub-section
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:marked
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2016-04-26 10:55:31 -07:00
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Running your app outside a browser means that you can take advantage of server-side
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pre-rendering for near-instant first app render times and for SEO. It means you could run from
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inside a Web Worker to improve your app's responsiveness by using multiple threads. And it
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means that you could run your app inside Electron.js or Windows Universal to deliver it to the desktop.
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2016-05-07 18:20:40 +01:00
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2016-06-14 09:26:54 +08:00
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在浏览器外运行应用程序意味着：利用服务器端预先渲染，为应用程序实现几乎实时的首次渲染，同时还能支持SEO(搜索引擎优化)。
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2016-05-18 11:38:10 +08:00
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意味着你可以在一个Web Worker中运行你的应用程序，通过多线程技术增强应用程序的响应性。
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还意味着你可以在Electron.js或者Windows Universal里面运行，发布到桌面环境。
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2016-04-10 09:14:24 -04:00
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:marked
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## Use the *Title* service
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2016-05-15 23:00:09 +01:00
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2016-05-07 18:20:40 +01:00
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## 使用*Title*服务
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2016-09-20 05:24:40 +02:00
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Fortunately, Angular bridges the gap by providing a `Title` service as part of the *Browser platform*.
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2016-07-06 14:39:14 -07:00
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The [Title](../api/platform-browser/index/Title-class.html) service is a simple class that provides an API
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2016-04-10 09:14:24 -04:00
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for getting and setting the current HTML document title:
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2016-05-07 18:20:40 +01:00
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2016-09-23 22:13:02 +01:00
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幸运的是，Angular在*浏览器平台*的包中，提供了一个`Title`服务，弥补了这种差异。
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2016-05-18 11:38:10 +08:00
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[Title](../api/platform/browser/Title-class.html)服务是一个简单的类，提供了一个API，用来获取和设置当前HTML文档的标题。
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2016-04-10 09:14:24 -04:00
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2017-04-12 15:08:44 -04:00
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* `getTitle() : string`—Gets the title of the current HTML document.
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2017-02-26 21:44:00 +08:00
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`getTitle(): string` —— 获取当前HTML文档的标题。
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2016-05-07 18:20:40 +01:00
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2017-04-15 15:34:47 +08:00
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* `setTitle( newTitle : string )`—Sets the title of the current HTML document.
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2017-02-26 21:44:00 +08:00
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`setTitle( newTitle: string)` —— 设置当前HTML文档的标题。
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2016-04-10 09:14:24 -04:00
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2017-04-12 15:08:44 -04:00
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You can inject the `Title` service into the root `AppComponent` and expose a bindable `setTitle` method that calls it:
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2016-05-07 18:20:40 +01:00
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2016-05-18 11:38:10 +08:00
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我们来把`Title`服务注入到根组件`AppComponent`，并暴露出可供绑定的`setTitle`方法让别人来调用该服务：
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2016-04-10 09:14:24 -04:00
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2017-02-02 18:38:17 +00:00
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+makeExample( "cb-set-document-title/ts/src/app/app.component.ts", "class", "src/app/app.component.ts (class)" )(format='.')
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2017-04-15 15:34:47 +08:00
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2016-04-10 09:14:24 -04:00
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:marked
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2017-04-12 15:08:44 -04:00
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Bind that method to three anchor tags and voilà!
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2016-05-07 18:20:40 +01:00
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2016-05-18 11:38:10 +08:00
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我们把这个方法绑定到三个A标签，瞧瞧！
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2016-05-15 23:00:09 +01:00
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2016-04-10 09:14:24 -04:00
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figure.image-display
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img(src="/resources/images/cookbooks/set-document-title/set-title-anim.gif" alt="Set title")
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:marked
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2017-04-12 15:08:44 -04:00
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Here's the complete solution:
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2016-05-07 18:20:40 +01:00
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2016-06-14 09:26:54 +08:00
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这里是完整的方案(代码)。
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2016-04-10 09:14:24 -04:00
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2016-08-06 07:45:32 +01:00
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+makeTabs(
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2017-02-02 18:38:17 +00:00
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`cb-set-document-title/ts/src/main.ts,
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cb-set-document-title/ts/src/app/app.module.ts,
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cb-set-document-title/ts/src/app/app.component.ts`,
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2016-04-10 09:14:24 -04:00
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'',
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2017-02-02 18:38:17 +00:00
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'src/main.ts, src/app/app.module.ts, src/app/app.component.ts' )
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2016-04-10 09:14:24 -04:00
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//
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2016-08-06 07:45:32 +01:00
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Todo: tie this back to the router so we can see how to use this Title service to (re)set the title
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2016-04-10 09:14:24 -04:00
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that appears in the window navigation history and shows up in the back/forward buttons
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during routing.
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2016-08-06 07:45:32 +01:00
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2016-04-10 09:14:24 -04:00
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See https://github.com/angular/angular/issues/7630#issuecomment-198328802
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2016-08-06 07:45:32 +01:00
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2016-04-10 09:14:24 -04:00
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.l-main-section
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:marked
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2017-04-12 15:08:44 -04:00
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## Why provide the *Title* service in *bootstrap*
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2016-05-15 23:00:09 +01:00
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2016-06-20 12:29:43 +01:00
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## 为什么要在*bootstrap*里面提供这个*Title*服务
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2016-08-06 07:45:32 +01:00
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2017-04-12 15:08:44 -04:00
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Generally you want to provide application-wide services in the root application component, `AppComponent`.
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2016-04-10 09:14:24 -04:00
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2016-05-18 11:38:10 +08:00
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我们通常会推荐在应用程序的根组件`AppComponent`中提供应用程序级的服务。
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2016-08-06 07:45:32 +01:00
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2017-04-12 15:08:44 -04:00
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This cookbook recommends registering the title service during bootstrapping,
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a location you reserve for configuring the runtime Angular environment.
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2016-04-10 09:14:24 -04:00
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2016-06-20 12:29:43 +01:00
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但这里，我们推荐在引导过程中注册这个Title服务，这个位置是为设置Angular运行环境而保留的。
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2016-08-06 07:45:32 +01:00
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2017-04-12 15:08:44 -04:00
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That's exactly what you're doing.
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2016-08-06 07:45:32 +01:00
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The `Title` service is part of the Angular *browser platform*.
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2017-04-12 15:08:44 -04:00
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If you bootstrap your application into a different platform,
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you'll have to provide a different `Title` service that understands
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the concept of a "document title" for that specific platform.
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Ideally, the application itself neither knows nor cares about the runtime environment.
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2016-05-07 18:20:40 +01:00
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2016-06-20 12:29:43 +01:00
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我们的做法正是如此。这里的`Title`服务是Angular*浏览器平台*的一部分。如果在其它平台上引导应用程序，就得提供另一个专为那个平台准备的`Title`服务。
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2017-04-15 15:34:47 +08:00
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2016-04-10 09:14:24 -04:00
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:marked
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[Back to top](#top)
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2016-05-07 18:20:40 +01:00
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[回到顶部](#top)
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