<channel-slider>

A <color-slider> for a specific channel, intended for color picking.

Usage

This is a higher level component than <color-slider> for the cases where you want to control a single channel of a color space. It offers many conveniences for these cases:

• It takes care of applying the right min and max values to the slider
• It automatically generates the start and end colors,
• It can provide an editable tooltip as a tooltip that both shows and edits the current value
• Already includes a suitable label

Static

Basic example:

<channel-slider space="oklch" channel="h"></channel-slider>

In most cases you’d also want to set a color to set the other channels and the initial value:

<channel-slider space="oklch" channel="h" color="oklch(80% 20% 130)"></channel-slider>

This will automatically use the whole reference range of that component in the specified color space, and use the current value of the component as the starting value (unless value is also specified).

The color does not actually need to be in the same color space, it will be converted if needed:

<channel-slider space="oklch" channel="h" color="deeppink"></channel-slider>

Colors and color spaces not supported by the browser also work:

<channel-slider space="okhsl" channel="h" color="color(--okhsl 180 100% 50%)"></channel-slider>

If you don’t want to show the whole range you can also specify min and max attributes.

<channel-slider space="oklch" channel="l" color="red" min=".3" max=".95"></channel-slider>

Dynamic

You can listen to the colorchange event and grab the color property to get the current color value. Here we are using a <color-swatch> to not just display the CSS code but also the actual color:

<channel-slider space="oklch" channel="h" color="oklch(50% 50% 180)"
				oncolorchange="this.nextElementSibling.textContent = this.color"></channel-slider>
<color-swatch></color-swatch>

All attributes are reactive:

<label>
	Space:
	<select id="space_select" size="3">
		<option>oklch</option>
		<option>oklab</option>
		<option>okhsl</option>
		<option>lab</option>
		<option>lch</option>
		<option>hsl</option>
		<option>srgb</option>
	</select>
</label>
<label>
	Channel:
	<select id="channel_select" size=3>
		<option>l</option>
		<option>c</option>
		<option>h</option>
	</select>
</label>

<channel-slider id="dynamic_slider" space="oklch" channel="h" color="oklch(50% 50% 180)"
				oncolorchange="this.nextElementSibling.textContent = this.color"></channel-slider>
<color-swatch></color-swatch>
<script>
	function fromSlider () {
		space_select.value = dynamic_slider.space.id;
		channel_select.innerHTML = Object.keys(dynamic_slider.space.coords).map(c => `<option>${c}</option>`).join('\n');
		channel_select.value = dynamic_slider.channel;
	}

	function fromSelects () {
		dynamic_slider.space = space_select.value;
		dynamic_slider.channel = channel_select.value;
	}

	space_select.oninput = channel_select.oninput = fromSelects;

	customElements.whenDefined("channel-slider").then(fromSlider);
	dynamic_slider.addEventListener("propchange", fromSlider);
</script>

Reference

Attributes & Properties

<script src="https://elements.colorjs.io/src/channel-slider/channel-slider.js" type="module"></script>

import "https://elements.colorjs.io/src/channel-slider/channel-slider.js";

import "color-elements/channel-slider";

import { ChannelSlider } from "color-elements";