Angular将一个组件作为另一个组件的ng-template传递 [英] Angular pass a Component as ng-template of another Component

问题描述

在Angular 6应用中，我需要将一个组件作为其 ng-template .

In my Angular 6 app I need to pass a Component to another Component as its ng-template.

原因是我有一个 A组件，需要多次复制，但是每次必须包含不同的组件(我们称它们为 B组件， 组件C )，其具有相同的输入.

The reason is that I have a Component A that I need to replicate many times, but each time it has to include different components (let's call them Component B and Component C) which have the same Inputs.

组件A 模板:

<div class="row-detail-panel">
  <h4 class="row-detail-panel-title">{{ newEntity ? 'Add new' : 'Edit this'}} {{ entityName }}</h4>

  <!--THIS IS THE COMPONENT I WANT TO INJECT-->
  <app-component-b
    [inline]="true"
    [form]="form"
  ></app-component-b>
  <!--END-->

  <!--some more html code here-->
</div>

然后我使用以下方法创建一个 Component A 实例:

And I create a Component A instance using:

<app-component-a
  [entity]="row"
  [entityName]="entityName"
></app-component-a>

---

因此，我考虑使用ng-template，因此按如下所示更改 Component A 模板:

---

So I thought about using ng-template, so changing the Component A template as follows:

<div class="row-detail-panel">
  <h4 class="row-detail-panel-title">{{ newEntity ? 'Add new' : 'Edit this'}} {{ entityName }}</h4>

  <ng-template></ng-template>

  <!--some more html code here-->
</div>

并使用以下方法创建 Component A 实例:

And creating a Component A instance using:

<app-component-a
  [entity]="row"
  [entityName]="entityName"
>
  <app-component-b
    [inline]="true"
    [form]="form" <!--PROBLEM: "form" does not exist here-->
  ></app-component-b>
</app-component-a>

因此，我可以轻松地将组件C 而不是组件B 注入为组件A 的ng-template:

So I can easily inject Component C instead of Component B as Component A's ng-template:

<app-component-a
  [entity]="row"
  [entityName]="entityName"
>
  <app-component-c
    [inline]="true"
    [form]="form" <!--PROBLEM: "form" does not exist here-->
  ></app-component-c>
</app-component-a>

问题:

我需要注入到 Component B 或 Component C 的变量form仅存在于 Component A 中，而 (位于组件A的父级中)(出于某些原因，我无法将其向上移动一级).

the variable form that I need to inject to Component B or Component C exists only inside Component A and not in Component A's parent (for some reasons I cannot move it one level up).

我该如何解决这个问题?

How can I solve this problem?

推荐答案

您是否只是通过以下方式尝试过:

Have you tried by simply doing:

<app-component-a #compA
  [entity]="row"
  [entityName]="entityName">
  <app-component-b
    [inline]="true"
    [form]="compA.form"
  ></app-component-b>
</app-component-a>

// component-a.html

<div class="row-detail-panel">
  <h4 class="row-detail-panel-title">{{ newEntity ? 'Add new' : 'Edit this'}} {{ entityName }}</h4>
  <ng-content></ng-content>
</div>

为使其正常工作，在A组件中定义的form成员应该是公共的，最好是readonly.

In order for this to work, the form member defined in the A component should be public, and preferably readonly.

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