What steps do I need to follow to create a unique angular component that allows for customizable width using CSS styles?

The instructions on this website suggest that the width of the side-nav can be changed using CSS like so:

md-sidenav {
   width: 200px;
}

This leads me to wonder, can I apply standard CSS properties such as width, position, etc... to custom components without defining them in my component?

For example:

my-component {
    width: 500px;
}

I experimented with it and found that it doesn't work. Therefore, I assume the answer is no, am I correct?

To investigate how they set the width with CSS, I looked through the source code on github. However, I couldn't determine how they achieved it since the component does not have a width property. So, how did they make width accessible with CSS?


EDIT:

To further clarify the question, here's an example:

I've created the following component:

test.component.html:

<p>test works!</p>

test.component.css:

p {
   border: 2px solid red;
}

test.component.ts:

import { Component, OnInit } from '@angular/core';

@Component({
  selector: 'app-test',
  templateUrl: './test.component.html',
  styleUrls: ['./test.component.css']
})
export class TestComponent implements OnInit {

  constructor() { }

  ngOnInit() { }

}

This is my app root that Angular bootstraps:

app.component.html:

<app-test>

</app-test>

app.component.css

app-test {
  height: 100px;
  width: 200px;
}

app.component.ts

import { Component } from '@angular/core';

@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.css']
})
export class AppComponent {
  title = 'Test App';
  constructor() { }

}

The _app.component.css_ demonstrates what I intended to achieve. I aim to set the size of the _app-test_ component using CSS. I observed this working with the _side-nav_ component in Angular Material and I want to understand how they enabled the _side-nav_ to inherit its width from the parent component's CSS file.

Answer №1

UPDATE Following OP's revision:

Revise your app.component.css as shown below:

:host {
  display:block; 
  height: 100px;
  width: 200px;
}

These styles will be applied to the <app-test> selector. Check out the plunker demo.


INITIAL Response:

To customize Material 2 components, use

encapsulation: ViewEncapsulation.None
in the component.

Then, define the necessary styles in your component.css file.

.mat-sidenav {
    width: 250px;
}

Refer to this plunker demo for a custom width example.


Update based on feedback from OP:

If you have a component named my.component.ts with associated styles in my.component.css, you can specify the component styles in the CSS file and apply them to the component selector using :host.

my.component.ts :

@Component({
    selector: 'my-comp', 
    templateUrl: 'my.component.html',
    styleUrls: ['my.component.css']
})
export class MyComponent{
}

my.component.css :

:host {
    width: 500px;
    background-color: red;
}

my.component.html:

<h2>Some Heading in the Template </h2>

Answer №2

A user named Will Howell provided a helpful comment in response to my question. This post aims to summarize the insights I have gained from other users' comments, making it easier for those with similar inquiries to benefit as well.

Each component template is enclosed within a host element, such as the md-sidenav tag in the sidenav example. The host element functions like a standard DOM element, allowing you to apply CSS rules like setting the width property to any custom Angular component. It's important to ensure that the display property of the host element is set to block, or else the width rule won't take effect on the element. For instance, in the case of the md-sidenav component, the class mat-drawer was applied within the component-decorator to the element.

Snippet from sidenav.ts:

    host: {
    'class': 'mat-drawer mat-sidenav',
    ...
  },

Subsequently, they implemented the rule in the stylesheet. Excerpt from drawer.scss:

 .mat-drawer {
     @include mat-drawer-stacking-context();

     display: block;
}

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