How can I apply styling to Angular 2 component selector tags?

As I explore various Angular 2 frameworks, particularly Angular Material 2 and Ionic 2, I've noticed a difference in their component stylings. Some components have CSS directly applied to the tags, while others use classes for styling. For instance, when looking at the Card component, you might see styles like this:

md-card { // some styling }

as opposed to

.md-card { // some styling }

I'm trying to determine which approach would be considered a best practice. The project I am currently working on has a mix of both methods for different components.

One advantage of using styles on elements is that it results in less clutter in the HTML template since there's no need for an additional wrapping tag. Additionally, certain Decorators like HostBinding may be easier to implement with this approach.

javascriptcssangulartypescriptsass

Answer №1

Here is a possible solution for your request:

styles: [`
    :host {
        display: inline-block;
        border: 1px solid black;
    }
`]

For example:

@Component({
    moduleId: module.id,
    selector: 'selector',
    templateUrl: 'template.html',
    styleUrls: ['template.component.css'],
    styles: [`
        :host {
            display: inline-block;
            border: 1px solid black;
        }
    `]
})

Answer №2

It appears that Angular Material 2 automatically adds a corresponding class to every component with host metadata, although it is not explicitly documented. This is why both mat-card and .mat-card selectors function.

Using the class selector can offer the advantage of separating your CSS rules from the HTML implementation. For instance, MatSidenav has both mat-drawer and mat-sidenav classes as shown here, so a single .mat-drawer rule would apply to both <mat-sidenav> and <mat-drawer> implementations. Additionally, during the transition from the md- prefix to the mat- prefix, components continued to use the md- prefix class to maintain backwards compatibility for some time.

However, utilizing the class selector in Angular Material 2 necessitates understanding that the class selectors will function properly. While this fact does not seem to be concealed or discouraged by Angular Material 2, as evidenced here.

This could potentially come down to personal preference, but consistency is key to maintaining readability and manageability. You may consider following their established pattern for your own components

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