Setting the style of the parent component using a transcluded component

I have two components, a main component and a subcomponent. The main component wraps the subcomponent to display some content with a title. The subcomponent uses transclusion.

The structure of the main component template is:

<div class="parent">
  <subcomponent [title]="componentTitle" class="child">
    <p>some content</p>
  </subcomponent>  
</div>

The structure of the subcomponent template is:

<div class="child">
  <h2 class="title">{{title}}</h2>
  <ng-content></ng-content>
</div>

Styling the transcluded content in the subcomponent can be done easily like this:

.child p {
  background-color: blue;
}

However, I am having trouble styling the title element. This rule doesn't work:

.child h2.title {
  background-color: red;
}

Since the main component hosts the subcomponent, using :host does not solve the issue.

Any ideas on how to style the title element?

Answer №1

One way to achieve this is by using the following code snippet:

::ng-deep {
    .child h2.title {
        background-color: red;
    }
}

However, it is important to note that this approach may be considered deprecated. A better alternative would be to pass an input into the child component. Here's a recommended method: 1) Add a @Input() property called titleColor to the child component. 2) Define a CSS class named .red with background-color: red; in the child component's stylesheet. 3) Apply the [ngClass]="titleColor" directive to the child component's h2 element.

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