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Font Awesome is not working in my shadow DOM since I have the following in it to prevent styles from leaking in and out:
:host {
all: initial; /* 1st rule so subsequent properties are reset. */
display: block;
contain: content; /* Boom. CSS containment FTW. */
}
I'm able to use other stylesheets by just inlining them within the :host property, but that doesn't work with Font Awesome since it uses relative paths in its stylesheet.
I found this post and tried it with the scoped CSS I implement, but the icons show as squares, as can be seen in my example.
251
The /css/all. css file contains the core styling plus all of the icon styles that you'll need when using Font Awesome.
Shadow DOM (V1) on Chrome is fully supported on 53-106, partially supported on None of the versions, and not supported on 4-52 Chrome versions. Shadow DOM (V1) on Safari is fully supported on 10-16, partially supported on None of the versions, and not supported on 3.2-9 Safari versions.
I had the same issue with StencilJS. After hours of struggle and the answer from @Intervalia I was able to fix it.
The problem is that the browser doesn't load the font files when they are only included in the shadow dom (your custom web component). This means that the fonts also has to be included in the normal html file (aka light DOM) so that the browser can detect and load them in order to make them available in the shadow dom.
In my case I didn't use Font awesome instead it was a custom font but I tried it a second time with font awesome and a clean Stenciljs project. The solution is always the same doesn't matter which custom font you need.
Step 1: Move the font into your project. I created a seperate "assets" folder inside the "src" folder to have access from all the components. In this example I downloaded font awesome for web environment https://fontawesome.com/download. (I wouldn't recommend "npm install" since you have to use it in the index.html too)
Step 2: Prepare your web component (in this case my-component.tsx). You can import multiple css files using the styleUrls property. Just import the fontawesome css from your assets directory.
import { Component, Prop, h } from '@stencil/core';
@Component({
tag: 'my-component',
styleUrls: [
'my-component.css',
'../../assets/fontawesome/css/all.css'
],
shadow: true
})
export class MyComponent {
@Prop() first: string;
render() {
return <div> <i class="fas fa-question-circle"></i> </div>;
}
}
Step 3 prepare the file where you want to use the component (in this case index.html). The important line is the "link" tag. This includes the "font awesome css" again and force the Browser to really download the fonts.
<!DOCTYPE html>
<html dir="ltr" lang="en">
<head>
<meta charset="utf-8">
<title>Stencil Component Starter</title>
<link rel="stylesheet" type="text/css" href="./assets/fontawesome/css/all.css">
</head>
<body>
<my-component first="Stencil" last="'Don't call me a framework' JS"></my-component>
</body>
</html>
I know it feels wrong and looks weird but it is not enough to include font awesome only in the index html or in the web component. It must really be included in both files. That doesn't mean the Browser will load it multiple times - it will only be loaded once.
That means that you can't deliver the font with the web component - as far as i know. This isn't a stenciljs bug this is a general problem of the browsers. Please let me know if you have better solutions.
Just for fun here is a screenshot that shows that the browser doesn't load the fonts when it is only included in one file. http://prntscr.com/p2f9tc
Update 05.10.2019:
If you want to use your font inside your web-component the explanation above is correct and still necessary. But you can also use the slot tag inside the web-component. Than you automatically bypass the font from outside (the html) into the web-component. But notice it only works for the stuff you write between the tags of your web component.
That means you can use <my-component> <i class="your-font"/> </my-component>. In this case you don't have to import the font into the web components.
168
One thing I have noticed is that if the page does not load the CSS file then the shadowDOM won't load it either.
I really think that the only problem us that if the font is not defined on the page that it will not work in the component since the rest of the CSS seems to properly apply to the shadowDOM elements.
This example shows just the shadowDOM trying to load the CSS and it does not work:
let template = `
<style>
:host {
display: block;
}
</style>
<link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.1/css/all.css" integrity="sha384-fnmOCqbTlWIlj8LyTjo7mOUStjsKC4pOpQbqyi7RrhN7udi9RwhKkMHpvLbHG9Sr" crossorigin="anonymous">
<header>
<h1>DreamLine</h1>
<nav>
<ul>
<li><a href="#0">Tour</a></li>
<li><a href="#0">Blog</a></li>
<li><a href="#0">Contact</a></li>
<li><a href="#0">Error</a></li>
<li><a href="#0"><i class="fa fa-search"></i> Search</a></li>
</ul>
</nav>
</header>
`;
class MyEl extends HTMLElement {
connectedCallback() {
this.attachShadow({mode: 'open'}).innerHTML = template;
}
}
customElements.define("blog-header", MyEl);<i class="fa fa-battery-full" style="font-size: 45px;"></i>
<hr/>
<blog-header></blog-header>
<hr/>And this example shows both the page and the shadowDOM loading it and it works:
let template = `
<style>
:host {
display: block;
}
</style>
<header>
<h1>DreamLine</h1>
<nav>
<ul>
<li><a href="#0">Tour</a></li>
<li><a href="#0">Blog</a></li>
<li><a href="#0">Contact</a></li>
<li><a href="#0">Error</a></li>
<li><a href="#0"><i class="fa fa-search"></i> Search</a></li>
</ul>
</nav>
</header>
`;
class MyEl extends HTMLElement {
connectedCallback() {
const styles = document.querySelector('link[href*="fontawesome"]');
this.attachShadow({mode: 'open'}).innerHTML = template;
if (styles) {
this.shadowRoot.appendChild(styles.cloneNode());
}
}
}
customElements.define("blog-header", MyEl);<link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.1/css/all.css" integrity="sha384-fnmOCqbTlWIlj8LyTjo7mOUStjsKC4pOpQbqyi7RrhN7udi9RwhKkMHpvLbHG9Sr" crossorigin="anonymous">
<i class="fa fa-battery-full" style="font-size: 45px;"></i>
<hr/>
<blog-header></blog-header>
<hr/>The code I like to use looks for the <link> tag I want in the body and then uses a clone of that tag inside the shadowDOM. This way my component is not out of sync. Yes, this can cause problems if the component was not expecting a change in the CSS but I find it works well for my projects.
23
If you don't need shadow: true then you can load the all.min.css directly via the index.html or the main application. Even loading the all.min.js file works.
If you need it within the shadow dom, then you need to load the all.min.css in index.html and also load it within shadow root using something like this.
`
componentDidLoad(): void {
this.hostElement.shadowRoot
.getElementById("some_Id")
.insertAdjacentHTML(
"afterbegin",
`<link rel="stylesheet" href="${getAssetPath(
"/fontAssets/fontawesome-free/css/all.min.css"
)}" />`
);
}
`
1
I wanted to share what I did for loading in Font Awesome icons to my stencil components (shadow enabled)...
After several hours into researching this topic, I think I've discovered a solution that will be the most efficient for my components to be bundled in a agnostic way and free of any additional style sheet includes in the HTML header.
My solution was to use the stencil-inline-svg module and then import the svg file directly from the Font Awesome module like this:
// the reference to the svg can be anything (searchIcon name).
// just make sure to import the correct svg from fontawesome node modules.
import searchIcon from 'fontawesome/svgs/regular/search.svg';
@Component({
tag: 'search-icon',
styleUrl: 'search-icon.scss',
shadow: true,
})
export class SearchIconComponent {
render(){
return (
{/* Not ideal to use innerHTML but this renders the full SVG markup */}
<span class="search-btn" innerHTML={searchIcon}></span>
)
}
}
Now, I can set css rules to modify the color and size of my icon like this
.search-btn {
width: 40px; // Set SVG size at the parent.
svg path {
fill: #fff; // Update svg path color.
}
}
Obviously this requires a little bit of Font Awesome icon knowledge so you know which icons to import.
1
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