Fylgja component - Range

Table of Contents

Range component will add solid foundation for a input range slider.

Installation

npm install @fylgja/range

Then include the component in to your code via;

@use "@fylgja/range";
// Or via PostCSS import
@import "@fylgja/range";

How to use

Out of the box all the styling is done directly, to the input[type=range],

<input type="range" value="50">
<input type="range" value="50" disabled>

The thumb (the value) and track (the background) are both styled to look the same in all browsers.

Fill range

Currently there is no cross browser support for “filling” the track, as a way to visually show progress, from the left or right of the thumb.

Only Firefox supports this, for now.

Instead, we provide a CSS variable that can be adjusted as a percentage to match the value.

Using a little bit of javascript this can also be added relatively with ease.

<input type="range" value="60" min="10" max="200" id="range-slider-with-js">
<script>
const setRangeValue = (input) => {
const min = input.getAttribute('min') || 0;
const max = input.getAttribute('max') || 100;
const value = input.value || 50;
const fillPercentage = Math.round(100 * (value - min) / (max - min));
input.style.setProperty('--_fill', fillPercentage);
}
setRangeValue(document.getElementById("range-slider-with-js"));
document.addEventListener('input', event => {
const input = event.target;
if (input.id !== "range-slider-with-js") return;
setRangeValue(input);
});
</script>

Color Range slider

Here's a sample case for range slider as color picker,.

Even if you need Javascript to handle the data, the track background can be set with just one CSS variable;

<input type="range" name="color-range" class="rainbow-slider" min="0" max="300">
<style>
.rainbow-slider {
--range-track-bg: linear-gradient(
to var(--fill-direction, right),
hsl(0deg 100% 50%),
hsl(120deg 100% 50%),
hsl(240deg 100% 50%),
hsl(300deg 100% 50%)
);
--range-track-height: 1rem;
--range-thumb-border-size: 2px;
--range-thumb-color: hsl(0deg 0% 100% / 80%);
--range-thumb-stroke: hsl(0deg 0% 0% / 60%);
}
</style>

Config

As with almost all of our components, CSS variables can be configured to add your own look/style.

Want direct control on the base styles, here are the following SCSS variables can you modify.

$range-track-height: 0.5rem;
$range-track-radius: 1rem;
$range-track-bg: track-fill(var(--color-theme, #{$color-theme}));
$range-track-color: #ccc;
$range-track-disabled-bg: currentcolor;
$range-track-disabled-color: #ddd;

$range-thumb-size: 1rem;
$range-thumb-radius: 100%;
$range-thumb-border-size: 0;
$range-thumb-border-color: var(--color-theme, #{$color-theme});
$range-thumb-color: var(--color-theme, #{$color-theme});
$range-thumb-disabled-color: #aaa;
$range-thumb-shadow: 0 1px 2px rgb(0 0 0 / 50%);

$range-focus-color: var(--color-theme-fade, #{$color-theme-fade}) !default;
$range-focus-shadow: 0 0 0 0.4rem var(--range-focus-color, #{$range-focus-color}) !default;

track-fill() is a helper function to set the linear-gradient, for the Javascript based fill method.

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