如何使用来自其他 Angular 组件的`templateref`? [英] How to use `templateref` from other Angular component?

问题描述

如何使用其他组件模板文件中的templateRef?

How to use templateRef from other component template file?

我有 BatmanComponent、SpidermanComponent 和 JokerComponent.其中一些具有相似的功能，因此我决定创建一个 HumanComponent，并将所有可重用的 HTML 代码放在该文件中，如下所示:

I have BatmanComponent, SpidermanComponent and a JokerComponent. Some of them have similar features, so that I decided to create a HumanComponent, and put all reusable HTML codes in that file, as such:

注意:HumanComponent 永远不会被使用，它只是一个包含所有默认模板的文件.

Note: the HumanComponent will never be used, it is just a file that consists all default template.

<!-- human.component.ts -->
<ng-template #eye>
    Eyes: {{ size }}
</ng-template>
<ng-template #body>
    Body: bust {{ x[0] }}, waist {{ x[1] }}, hip {{ x[2] }} 
</ng-template>

我可以知道如何注入这些模板(来自 human.component.ts)并在 batman.component.ts 中使用它，等等...?

May I know how to inject those template (from human.component.ts) and use it inside the batman.component.ts, etc...?

我知道我可以这样做:(只有如果模板代码被复制粘贴到蝙蝠侠、蜘蛛侠和小丑 HTML文件中)

I know I can do it as such: (only if the template code is being copy-paste inside the batman, spiderman, and joker HTML files)

<!-- batman.component.ts -->
<ng-container *ngTemplateOutlet="eye; context: contextObj"></ng-container>

<ng-template #eye> ... </ng-template> <!-- need to copy/paste here, and use it locally -->

我可以知道如何将导出 templateRef 到其他文件并重新使用它们?我不想在这些文件中复制和粘贴类似的代码，我希望我可以有一个默认的模板文件，然后将这些代码导出给任何想要它的人.可能吗?

May I know how can I export templateRef to other files, and re-use them? I don't want to copy and paste similar codes across those files, I hope I can have a default template file, and just export those codes to whoever want it. Is it possible?

更新:

阅读评论后，我决定使用可重用组件，而不是这种技术"……可能，Angular 团队正在努力优化可重用组件方法(如@artyom，@rafael，@ibenjelloun 建议)，那么可能只是按照他们的方式走会更明智......哈哈......

After reading the comments, I decided to use the reusable component rather than this "techniques"... Probably, the Angular team is trying hard to optimize the reusable component approach (as @artyom, @rafael, @ibenjelloun suggested), then probably just follow their path will be wiser... Haha...

无论如何，谢谢.

推荐答案

如果您创建一个 TemplatesService，您可以在其中注册您的模板并在其他组件中使用它们:

If you create a TemplatesService, you can register your templates in it and use them in other components :

import { Injectable } from '@angular/core';

@Injectable({
  providedIn: 'root'
})
export class TemplatesService {
  templates = {};
  add(name: string, ref) {
    this.templates[name] = ref; 
  }
  get(name: string) {
    return this.templates[name];
  }
}

然后，您可以从根组件将模板添加到服务中:

You can then add your templates to the service from a root component :

{{ _templatesService.add('template1', template1) }}
{{ _templatesService.add('template2', template2) }}

<ng-template #template1 let-name="name">
  ****** Template 1 {{name}} ******
</ng-template>

<ng-template #template2 let-name="name">
  ----- Template 2 {{name}} ------
</ng-template>

并在另一个组件中使用它们:

And use them in another component :

<ng-container *ngTemplateOutlet="_templatesService.get('template1'); 
 context: {name: 'From Hello Component'}"></ng-container>

这是一个 stackblitz 演示.

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