Monday, 31 December 2018

Transclusion using ng-content

Understanding Transclusion
Transclusion means the inclusion of the content of one document in another document by reference (wikipedia).

Content Projection in Angular with ng-content
Let’s say you have a home component with a decorator that goes a bit like this:

@Component({ selector: 'home', template: ` <h1>Heroic Title</h1> <p>Something good...</p> ` })

And let’s say you want to be able to do something like this when including the component:

<home> <p>Something else</p> </home>

Then what you would do is use <ng-content></ng-content> like this in your component template:

@Component({ selector: 'home', template: ` <h1>Heroic Title</h1> <p>Something good...</p> <ng-content></ng-content> ` })

The result will then be the following:

<h1>Heroic Title</h1> <p>Something good...</p> <p>Something else</p>

And with this, you could also place components inside your wrapper component. Here’s how you would, for example, project the myNav component inside the home component:

<home> <myNav></myNav> </home>

You can also use select on ng-content to define what should be included. In this example, only div elements would be included:

@Component({ selector: 'home', template: ` <h1>Heroic Title</h1> <p>Something good...</p> <ng-content select="div"> </ng-content> ` })

And you can use the [attr] syntax to select only elements that have a specific attribute. In the following example, only something like <p intro>…</p> would be included:

@Component({ selector: 'home', template: ` <h1>Heroic Title</h1> <p>Something good...</p> <ng-content select="[intro]"> </ng-content> ` })


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