How to load several stylesheets for a component in Angular 2

Struggling with my angular2 application, I encountered an issue when attempting to load multiple stylesheets for the same component. Below is a snippet of the code:

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

@Component({
selector: 'my-tag',
templateUrl: 'my-tag.component.html',
styleUrls: [
    './style1.css',
    './style2.css'
    ]
})
export class MyTagComponent{}

The problem arises when trying to include a CSS file from another directory in this manner:

styleUrls: [
    './style1.css',
    '../public/style2.css'
]

This results in the error message

Uncaught Error: Expected 'styles' to be an array of strings.
being displayed in the browser console.

In order to avoid this, I relocated the second stylesheet style2.css to the component's directory and used the initial code snippet. However, this led to a new issue where the styling is applied globally instead of just to the component itself. The conflicting class names in the second stylesheet override the Bootstrap style, affecting all other components in the application.

Shouldn't the URLs specified in styleUrls only affect the specific component without causing interference elsewhere?

If anyone has a solution on how to load multiple CSS files for a specific component without global impact, your input would be greatly appreciated.

I have tested various solutions including:

styles: [
      require('./style1.css').toString(),
      require('../public/style2.css').toString()
 ]

However, these attempts still result in the styles being applied universally across all components.

For additional context, I am utilizing webpack as the module bundler for this project.

webpack.config(excerpt)

 {
    test: /\.css$/,
    exclude: helpers.root('src', 'app'),
    loader: ExtractTextPlugin.extract('style', 'css?sourceMap')
  },
  {
    test: /\.css$/,
    include: helpers.root('src', 'app'),
    loader: 'raw'
  }

Answer №1

I have observed a common approach being used:

@Component({
    selector: 'app',
    templateUrl: './app.component.html',
    styleUrls: ['./app.component.css']
})
export class AppComponent {
}

In the app.component.css file, there are multiple imports present, such as:

@import url('/assets/plugins/bootstrap-datepicker/css/bootstrap-datepicker.css');
@import url('/assets/plugins/bootstrap-datepicker/css/bootstrap-datepicker3.css');
@import url('/assets/plugins/ionRangeSlider/css/ion.rangeSlider.css');
@import url('/assets/plugins/ionRangeSlider/css/ion.rangeSlider.skinNice.css');

I trust this information proves to be helpful.

Answer №2

To easily include template and CSS files in our Angular components, we can use the templateUrl and styleUrls metadata properties. By keeping these files together with the component, we can simply refer to them by name without needing to specify a full path back to the root of the application.

If we want Angular to calculate the full URL differently, we can set the moduleId property in the component metadata to module.id.

@Component({
  selector: 'my-tag',
  moduleId: module.id,
  templateUrl: 'my-tag.component.html',
  styleUrls:  ['style1.css', 'style2.css']
})
export class MyTagComponent { }

Update#1

For webpack:

Consider using the 'to-string-loader' for handling CSS in your webpack configuration file.

{ test: /\.css$/, loaders: ['to-string-loader', 'css-loader'] }

Hopefully this solution will work for you.

Answer №3

It seems like the issue lies in the argument you are passing to ExtractPlugin.extract(loader: options|object) concerning the 'style' parameter. This may be related to the loader found at https://github.com/webpack/style-loader, which inserts a style tag into the DOM, resulting in global application of styles.

I encountered a similar issue recently and looked up the explanation provided above just for this post. To address it properly, I should go back and make necessary adjustments keeping that in mind. However, a temporary solution I used was to utilize the css-loader as shown below:

  {
    test: /\.css$/,
    loader: "css-loader"
  }

Additionally, I set the encapsulation to ViewEncapsulation.Native and followed your advice on calling .toString() on the loaded CSS. Even though the 'style' loader has been eliminated, there is still potential for using ExtractTextPlugin in place of it.

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