One issue with Angular2 is that it fails to inject template CSS upon refreshing the page

My application utilizes the selector portfolio-app and includes two stylesheets -

'../app/styles/templateMobile.css', '../app/styles/templateOther.css'

When I initially access my app from the default URL (localhost:3000 ATM), the stylesheets are properly applied. However, if I navigate to a different route and then refresh the page (F5), the template styles do not display correctly. This issue persists even when starting on a different route.

No error messages are appearing in the console.

I have tested this across multiple browsers including Firefox, Chrome, Safari, incognito mode, and with cleared browser cache. Additionally, I tested on various devices such as an LG G2, iPhone, iPad, and android emulators like Nexus 9, Nexus 10, Galaxy Nexus - always encountering the same result.

app.component:

import { Component } from 'angular2/core';
import {ViewEncapsulation} from 'angular2/core';
import { ROUTER_PROVIDERS, ROUTER_DIRECTIVES, RouteConfig } from 'angular2/router';

import { LandingComponent } from './landing.component';
import { PortfolioComponent } from './portfolio.component';
import { PagesService } from './pages.service';

@Component({
    selector: 'portfolio-app',
    templateUrl: '/app/views/template.html',
    styleUrls: ['../app/styles/templateMobile.css', '../app/styles/templateOther.css'],
    encapsulation: ViewEncapsulation.None,
    directives: [ROUTER_DIRECTIVES],
    providers: [ROUTER_PROVIDERS, PagesService]
})

@RouteConfig([
    { path: '/landing', name: 'Landing', component: LandingComponent, useAsDefault: true },
    { path: '/portfolio', name: 'Portfolio', component: PortfolioComponent }
])

export class AppComponent {
    landing = true;
    portfolio = false;

    changeMiniNavLanding = function () {
        this.landing = true;
        this.portfolio = false;
    }

    changeMiniNavPortfolio = function () {
        this.landing = false;
        this.portfolio = true;
    }
}

main.ts :

import {bootstrap}    from 'angular2/platform/browser';
import {AppComponent} from './app.component';

bootstrap(AppComponent);

If you require further information, feel free to ask or explore the gitHub repository. (all relevant files are located in the app folder).

Thank you for your assistance.  

Answer №1

After cloning your repository, I can confirm that your styles are loading correctly. However, the issue you're experiencing is not due to CSS injection but rather stems from what I would describe as poor design choices and a lack of using ViewEncapsulation.

Before delving into the problem, I must point out that with your current approach to CSS usage, it would be more beneficial for you to utilize a single global CSS file.

Explanation
When ViewEncapsulation is not employed, any imported CSS will persist on the page until it is refreshed, remaining applied to any relevant elements. Due to the fact that these styles are only injected when visiting the corresponding component or route, certain CSS may not be injected upon refreshing the page if the associated component was never visited.

Let's take the appContainer class as an example to illustrate this issue.

In the file styles/landingOther.css, you have:

.appContainer {
    width: 60%;
}

Given that the default route is /landing, visiting http://localhost:3000/ injects the .appContainer class onto the page, persisting until a refresh occurs. Consequently, transitioning to /portfolio retains the injected styling. However, directly accessing http://localhost:3000/portfolio bypasses the landing component, resulting in the .appContainer class not being applied since it wasn't injected initially. The same applies to other classes as well. Hopefully, this explanation clarifies the issue.

Furthermore, it appears there is a discrepancy in the file naming convention within your portfolio.component.ts, where the file name is capitalized whereas the actual file uses lowercase letters.

Answer №2

Should we eliminate the starting '..'?

 styleUrls: ['/app/styles/templateMobile.css', '/app/styles/templateOther.css']

or use relative paths instead

['./styles/templateMobile.css', './styles/templateOther.css']

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