Tips for preventing Angular from requiring an additional tag for a child component

Consider a scenario where I have a parent and child component in Angular 12. Their templates are structured as follows:

Parent:

<h1>This is the parent component</h1>
<div class="container">
    <div class="row">
        <div class="col">Foo</div>
        <ng-container>
            <app-child-component></app-child-component>
        </ng-container>
    </div>
</div>

Note: ng-container must be used.

Child:

<button>Click</button>

Angular creates a wrapper around the child component template, resulting in:

    <h1>This is the parent component</h1>
    <div class="container">
        <div class="row">
            <div class="col">Foo</div>
            <app-child-component>
                <button>Click</button>
            </app-child-component>
        </div>
    </div>

The desired layout I aim to achieve is:

        <h1>This is the parent component</h1>
        <div class="container">
            <div class="row">
                <div class="col">Foo</div>
                <button>Click</button>
            </div>
        </div>

I attempted using an attribute selector, like so:

<div app-child-component></div>

Unfortunately, this approach adds an unnecessary div element. Attribute selectors cannot be applied to elements like ng-template.

angulartypescriptangular-componentsng-container

Answer №1

You have the option to utilize 

<ng-content></ng-content>
within a Child component, like so:

<div>
   <ng-content></ng-content>
</div>

Following that, you can experiment with this code snippet:

 <div class="container">
    <div class="row">
        <div class="col">Foo</div>
        <app-child-component>
            <button>Click</button>
        </app-child-component>
    </div>
</div>

If you are interested in learning more about content projection in Angular, visit this Medium article for additional details.

Answer №2

Overcoming this challenge in Angular can be quite tricky as it always generates a host element.

There is a method to flatten the hierarchy, but it ends up adding an unnecessary node.

To achieve this, you need to utilize ng-template within the app-child-component:

<ng-template #temlate><button>Click</button></ng-template>

Next, inject the ViewContainerRef into the app-child-component.

Use the ViewContainerRef to render the template:

// the exact usage escapes my memory
viewContainerRef.createEmbeddedView(tempalteRef, null, viewContainerRef.length);

This will display the template below the app-child-component node, resulting in:

<h1>This is parent component</h1>
<div class="container">
    <div class="row">
        <div class="col">Foo</div>
        <app-child-component></app-child-component>
        <button>Click</button>
    </div>
</div>

You can then hide the app-child-component node using CSS:

:host {
   display: none;
}

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