Updating the <link> tag in the template HTML to styleUrls to improve code quality

I am currently in the process of restructuring a Component, which originally linked stylesheets in its HTML template but I want to switch to using styleUrls instead.

The original template contained an include similar to this:

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/font-awesome/4.4.0/css/font-awesome.min.css">

After the refactor, it now looks like this:

styleUrls: [
    'https://maxcdn.bootstrapcdn.com/font-awesome/4.4.0/css/font-awesome.min.css'
],
encapsulation: ViewEncapsulation.None

The stylesheet is loading successfully, however, it is being loaded as an inline style rather than through the link tag. This means references like:

src:url('../fonts/fontawesome-webfont.eot?v=4.4.0');

Are not pointing to:

https://maxcdn.bootstrapcdn.com/font-awesome/4.4.0/fonts/fontawesome-webfont.eot?v=4.4.0

Instead, they should be pointing to:

http://localhost:9000/fonts/fontawesome-webfont.eot?v=4.4.0

I'm unsure how to proceed with refactoring the HTML template to use styleUrls while preserving the relative references. Any advice would be greatly appreciated!

cssangular

Answer №1

I encountered a similar issue, but managed to work around it thanks to the insights shared here in subsequent discussions.

To overcome this challenge, I had to develop a custom UrlResolver. You can refer to this test case in the Angular2 Material repository where they showcase how a custom url resolver is implemented. Relevant excerpts are provided below.

import {TestUrlResolver} from './test_url_resolver';
import {..., bind} from 'angular2/core';

bind(UrlResolver)
    .toValue(new TestUrlResolver());

For those interested, here is the TypeScript rendition of the TestUrlResolver (while the Dart version can also be found):

import {UrlResolver} from 'angular2/src/core/compiler/url_resolver';

export class TestUrlResolver extends UrlResolver {
  constructor() {
    super();
  }

  resolve(baseUrl: string, url: string): string {
    // The default UrlResolver typically looks for "package:" templateUrls within node_modules,
    // however, our project hosts material widgets at the root level.
    if (url.startsWith('package:angular2_material/')) {
      return '/base/dist/js/dev/es5/' + url.substring(8);
    }
    return super.resolve(baseUrl, url);
  }
}

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