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

在我的 Angular 6 应用程序中，我需要将一个组件作为它的 ng-模板.

原因是我有一个组件A需要多次复制，但每次都必须包含不同的组件(我们称它们为组件B和组件 C)，具有相同的输入.

组件 A 模板:

<h4 class="row-detail-panel-title">{{ newEntity ?'添加新':'编辑此'}} {{ entityName }}</h4><!--这是我想要注入的组件--><app-组件-b[内联]="真"[形式]="形式"></app-component-b><!--END--><!--这里还有一些 html 代码-->

我创建了一个 Component A 实例，使用:

<小时>

于是我想到了使用ng-template，于是将Component A模板改成如下:

<h4 class="row-detail-panel-title">{{ newEntity ?'添加新':'编辑此'}} {{ entityName }}</h4><ng-template></ng-template><!--这里还有一些 html 代码-->

并使用以下方法创建组件 A 实例:

所以我可以轻松地将Component C而不是Component B注入Component A的ng-template:

问题:

我需要注入到组件B或组件C的变量form只存在于组件A中并且不是在组件A的父级中(由于某些原因，我无法将其向上移动一级).

我该如何解决这个问题?

解决方案

您是否尝试过简单地做:

<app-组件-b[内联]="真"[form]="compA.form"></app-component-b></app-component-a>//组件-a.html<div class="row-detail-panel"><h4 class="row-detail-panel-title">{{ newEntity ?'添加新':'编辑此'}} {{ entityName }}</h4><ng-content></ng-content>

为了使其工作，A 组件中定义的 form 成员应该是公共的，最好是 readonly.

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

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.

Component A template:

<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>

And I create a Component A instance using:

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

---

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>

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>

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>

PROBLEM:

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).

How can I solve this problem?

解决方案

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>

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

这篇关于Angular 将一个组件作为另一个组件的 ng-template 传递的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！