Native Dual-range Input

The native part is somewhat open for discussion - the library uses two native range inputs and about sixty lines of JavaScript to make them work together. In my book, it is native enough.

If you are interested in how it works, please check the blog post.

Usage

Install it:

npm install @stanko/dual-range-input

Add the required markup:

<div class="dual-range-input">
  <input type="range" min="0" max="100" step="1" value="25" id="min" />
  <input type="range" min="0" max="100" step="1" value="75" id="max" />
</div>

Import the CSS file located at:

./node_modules/@stanko/dual-range-input/dist/index.css

Instantiate the library:

import DualRangeInput from '@stanko/dual-range-input';

const $min = document.querySelector('#min');
const $max = document.querySelector('#max');

new DualRangeInput($min, $max);

// Add native event handlers
$min.addEventListener('input', () => {
  // ...
});

Parameters

$min HTMLInputElement - The range input element for the minimum value
$max HTMLInputElement - The range input element for the maximum value
precision number, optional, defaults to 3 - The number of decimal places to round the mid value to

Styling

Styles are controlled using CSS variables.

Here are all of the variables and their default values:

/* Height of the input */
--dri-height: 1.5rem;

/* Thumb size */
--dri-thumb-width: 1.25rem;
--dri-thumb-height: 1.25rem;

/* Thumb background color */
--dri-thumb-color: #ddd;
--dri-thumb-hover-color: #a8d5ff;
--dri-thumb-active-color: #4eaaff;

/* Thumb border */
--dri-thumb-border-color: rgba(0, 0, 0, 0.1);
--dri-thumb-border-hover-color: var(--dri-thumb-border-color);
--dri-thumb-border-active-color: var(--dri-thumb-border-color);
--dri-thumb-border-radius: 1rem;
--dri-thumb-border-width: 1px;

/* Track size */
--dri-track-height: 0.25rem;
--dri-track-border-radius: 1rem;

/* Track color */
--dri-track-color: #ccc;
--dri-track-filled-color: #0084ff;

Please note that --dri-thumb-width is used by the library through the CSS calc() methods.

Custom theme

To create your own theme, just change the variables. For example here is code for the purple example from the demo page:

.dual-range-input--purple {
  --dri-thumb-width: 2rem;
  --dri-thumb-height: 2rem;

  --dri-thumb-color: #ddd;
  --dri-thumb-active-color: #682af8;
  --dri-thumb-hover-color: #b697ff;

  --dri-track-filled-color: #682af8;

  --dri-height: 2rem;
}

This gives you:

You can find more examples in the demo SCSS file.

:focus-visible styles

These are the default focus styles, feel free to override them.

.dual-range-input:has(input:focus-visible) {
  outline: 2px solid var(--dri-thumb-active-color);
  outline-offset: 4px;
  border-radius: 4px;
}

API

update(method: 'floor' | 'ceil' = 'ceil')

The main method that updates the mid-point and the gradient fill. You should call it only when you make direct changes to one of the input's value.

method is the rounding method used for the mid-point. It is used only when the midpoint falls between two tickmarks. In the case of direct value changes, this doesn't matter much. However, the library uses ceil when the minimum input is updated and floor when the maximum input is updated.
```
const priceInput = new DualRangeInput($min, $max);

$min.value = 20;
priceInput.update('ceil');

$max.value = 37;
priceInput.update('floor');
```

destroy()

Removes event listeners set by the library.

const priceInput = new DualRangeInput($min, $max);

priceInput.destroy();

WebComponent

For now, for those who prefer WebComponents, here is a simple example:

import DualRangeInput from '@stanko/dual-range-input';

class DualRangeInputWebComponent extends HTMLElement {
  constructor() {
    super();

    const $min = this.querySelector('input[type=range]:first-child');
    const $max = this.querySelector('input[type=range]:nth-child(2)');

    new DualRangeInput($min, $max);
  }
}

customElements.define('dual-range-input', DualRangeInputWebComponent);

TODO

Other

Library is only available as ESM module.

Library doesn't include border around the track, it just feels too hacky. But here is the code if you want to use it:

.dual-range-input {
  --dri-track-border-color: #ccc;
  position: relative;

  &::before {
    content: '';
    display: block;
    position: absolute;
    background-color: var(--dri-track-border-color);
    border-radius: var(--dri-track-border-radius);
    // Make it stick 1px on each side
    height: calc(var(--dri-track-height) + 2px);
    left: -1px;
    right: -1px;
    // Center it vertically
    top: 50%;
    transform: translateY(-50%);
  }

  input {
    // Put the inputs above it
    position: relative;
    z-index: 1;
  }
}

Stanko/dual-range-input