When working in an HTML file, you have the ability to link stylesheets using this syntax:
<link rel="stylesheet" media="(min-width: 768px)" href="small.css">
<link rel="stylesheet" media="(min-width: 1150px)" href="big.css">
However, in a JSX file, CSS files can only be imported like so: import "./big.css"
I am curious about how one might go about conditionally importing CSS files into a React component based on the screen size. Any ideas?
One way to handle module imports conditionally is by using the require function, as shown in the example below:
if (window.innerWidth < 480) {
require('./index.css')
}
If you prefer using ES6 import, it requires configuration as it does not work out of the box. You can make use of babel plugin dynamic imports for this purpose, which can be found here
Please note: The above example will load the CSS after a reload when dynamically changing screen size in the browser. However, if you start with a smaller screen size initially, the CSS will still load. If you need to re-render your component dynamically based on user or developer resizing the browser window, make sure to implement the logic for re-rendering based on screen size changes.If the window loads or the screen size changes, this function will be triggered and you can adjust it to fit your requirements.
let loadCustomCSS = function(event) {
if (window.innerWidth < 480) {
require('./index.css')
}
}
window.addEventListener("load",loadCustomCSS);
window.addEventListener("resize", loadCustomCSS);
While the previous responses are satisfactory, if you require dynamic rendering, those solutions may not be sufficient as they do not capture window values when they change.
My suggestion is to utilize modules in order to replicate the functionality of media queries, like so: [name].module.css
Here is an example code snippet:
import {useState, useEffect} from "react"
import homeStyles from "../public/Home.module.css"
export default function App() {
const [value, setValue] = useState(window.innerWidth)
useEffect(() => {
window.addEventListener("resize", () => {
setValue(window.innerWidth)
})
}, [])
return (
<div>
<h1 className={
value < 650 ? homeStyles.colorOne : homeStyles.colorTwo
}>
The value is
{
value
}
</h1>
</div>
);
}
The corresponding CSS would look like this:
.colorOne {
color: blue;
}
.colorTwo {
color: red;
}
This approach essentially emulates a media query using the provided code and the window.innerWidth value. While it may not be identical to traditional media queries, it can serve as a viable alternative for your needs.
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