ReferenceSliders

media-slider

A composable slider component with track, fill, thumb, preview, and value parts

Import

import '@videojs/html/ui/slider';
import '@videojs/html/ui/slider-track';
import '@videojs/html/ui/slider-fill';
import '@videojs/html/ui/slider-thumb';
import '@videojs/html/ui/slider-preview';
import '@videojs/html/ui/slider-thumbnail';
import '@videojs/html/ui/slider-value';

Anatomy

<media-slider>
  <media-slider-track>
    <media-slider-fill></media-slider-fill>
  </media-slider-track>
  <media-slider-thumb></media-slider-thumb>
  <media-slider-preview>
    <media-slider-thumbnail>
      <img alt="" decoding="async" />
    </media-slider-thumbnail>
    <media-slider-value type="pointer"></media-slider-value>
  </media-slider-preview>
</media-slider>

Behavior

The base slider provides a generic range input. It manages value, pointer tracking, and drag interactions. The time slider and volume slider add media-specific bindings. The time slider also provides parts for rendering chapter ranges and the chapter at the current interaction position.

media-slider-thumbnail supplies the pointer value and draws the image in its shadow DOM. Supply an <img> child to replace it: the element controls src and srcset on your image, and other children can provide loading indicators or overlays.

The slider supports vertical orientation via the orientation prop (defaults to "horizontal").

Styling

Use CSS custom properties to position fill, thumb, and preview elements:

media-slider-fill {
  width: var(--media-slider-fill);
}

media-slider-thumb {
  left: var(--media-slider-fill);
}

Style based on interaction state:

media-slider[data-interactive] media-slider-track {
  height: 6px;
}
media-slider[data-pointing] media-slider-preview {
  opacity: 1;
}

Accessibility

Renders with role="slider" and automatic ARIA attributes (aria-valuemin, aria-valuemax, aria-valuenow, aria-valuetext). Override the label with the label prop. Keyboard controls:

Arrow Left / Arrow Right: step by step increment
Page Up / Page Down: step by largeStep increment
Home: jump to minimum
End: jump to maximum

Examples

Basic

A slider with track, fill, and thumb.

<div class="demo">
  <media-slider class="media-slider" value="50">
    <media-slider-track class="media-slider-track">
      <media-slider-fill class="media-slider-fill"></media-slider-fill>
    </media-slider-track>
    <media-slider-thumb class="media-slider-thumb"></media-slider-thumb>
  </media-slider>
</div>

.demo {
  display: flex;
  align-items: center;
  padding: 24px;
  background: #1a1a1a;
}

.media-slider {
  position: relative;
  display: flex;
  align-items: center;
  width: 100%;
  height: 20px;
  cursor: pointer;
}

.media-slider-track {
  position: absolute;
  right: 0;
  left: 0;
  height: 4px;
  background: rgba(255, 255, 255, 0.3);
  border-radius: 9999px;
  transition: height 150ms ease;
}

.media-slider[data-interactive] .media-slider-track {
  height: 6px;
}

.media-slider-fill {
  position: absolute;
  top: 0;
  left: 0;
  width: var(--media-slider-fill);
  height: 100%;
  background: white;
  border-radius: 9999px;
}

.media-slider-thumb {
  position: absolute;
  left: var(--media-slider-fill);
  width: 14px;
  height: 14px;
  background: white;
  border-radius: 50%;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.4);
  transform: translateX(-50%) scale(0);
  transition: transform 150ms ease;
}

.media-slider[data-interactive] .media-slider-thumb {
  transform: translateX(-50%) scale(1);
}

.media-slider[data-dragging] .media-slider-thumb {
  transform: translateX(-50%) scale(1.1);
}

import '@videojs/html/ui/slider';
import '@videojs/html/ui/slider-track';
import '@videojs/html/ui/slider-fill';
import '@videojs/html/ui/slider-thumb';

With Preview

A slider with a pointer-tracking preview that displays the value at the current pointer position.

<div class="demo">
  <media-slider class="media-slider" value="50">
    <media-slider-track class="media-slider-track">
      <media-slider-fill class="media-slider-fill"></media-slider-fill>
    </media-slider-track>
    <media-slider-thumb class="media-slider-thumb"></media-slider-thumb>
    <media-slider-preview class="preview">
      <media-slider-value type="pointer" class="media-slider-value"></media-slider-value>
    </media-slider-preview>
  </media-slider>
</div>

.demo {
  display: flex;
  align-items: center;
  padding: 40px 24px;
  background: #1a1a1a;
}

.media-slider {
  position: relative;
  display: flex;
  align-items: center;
  width: 100%;
  height: 20px;
  cursor: pointer;
}

.media-slider-track {
  position: absolute;
  right: 0;
  left: 0;
  height: 4px;
  background: rgba(255, 255, 255, 0.3);
  border-radius: 9999px;
  transition: height 150ms ease;
}

.media-slider[data-interactive] .media-slider-track {
  height: 6px;
}

.media-slider-fill {
  position: absolute;
  top: 0;
  left: 0;
  width: var(--media-slider-fill);
  height: 100%;
  background: white;
  border-radius: 9999px;
}

.media-slider-thumb {
  position: absolute;
  left: var(--media-slider-fill);
  width: 14px;
  height: 14px;
  background: white;
  border-radius: 50%;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.4);
  transform: translateX(-50%) scale(0);
  transition: transform 150ms ease;
}

.media-slider[data-interactive] .media-slider-thumb {
  transform: translateX(-50%) scale(1);
}

.media-slider[data-dragging] .media-slider-thumb {
  transform: translateX(-50%) scale(1.1);
}

.preview {
  position: absolute;
  bottom: 100%;
  margin-bottom: 6px;
  pointer-events: none;
  opacity: 0;
  transition: opacity 150ms ease;
}

.media-slider[data-pointing] .preview {
  opacity: 1;
}

.media-slider-value {
  padding: 2px 6px;
  font-size: 12px;
  color: white;
  white-space: nowrap;
  background: rgba(0, 0, 0, 0.8);
  border-radius: 4px;
}

import '@videojs/html/ui/slider';
import '@videojs/html/ui/slider-track';
import '@videojs/html/ui/slider-fill';
import '@videojs/html/ui/slider-thumb';
import '@videojs/html/ui/slider-preview';
import '@videojs/html/ui/slider-value';

API Reference

media-slider

Props

Prop	Type	Default
`disabled`	`boolean`	`false`
Description Whether the slider is non-interactive.
`label`	`object`	`''`
Description Custom label for the slider. Type `{ key: string; text: string } \| string \| ((state: SliderState) => Text \| string)`
`largeStep` attribute `large-step`	`number`	`10`
Description Large step increment (Page Up/Down keys).
`max`	`number`	`100`
Description Maximum value of the slider range.
`min`	`number`	`0`
Description Minimum value of the slider range.
`orientation`	`'horizontal' \| 'vertical'`	`'horizontal'`
Description Axis of slider movement.
`step`	`number`	`1`
Description Step increment for value changes (arrow keys).
`thumbAlignment` attribute `thumb-alignment`	`'center' \| 'edge'`	`'center'`
Description How the thumb aligns at the track edges. `edge` constrains the thumb within track bounds.
`value`	`number`	`0`
Description Current slider value.

State

State is reflected as data attributes for CSS styling.

Property	Type	Details
`value`	`number`
Description Current slider value in the min–max range.
`fillPercent`	`number`
Description Fill level as a percentage (0–100), derived from value.
`pointerPercent`	`number`
Description Pointer position as a percentage of the track (0–100).
`dragging`	`boolean`
Description Whether the user is actively dragging.
`pointing`	`boolean`
Description Whether the pointer is over the slider.
`interactive`	`boolean`
Description Whether dragging, pointing, or focus is active.
`orientation`	`'horizontal' \| 'vertical'`
Description Axis of slider movement.
`disabled`	`boolean`
Description Whether the slider is non-interactive.
`thumbAlignment`	`'center' \| 'edge'`
Description How the thumb aligns at the track edges.

Data attributes

Attribute	Type	Details
`data-dragging`	—
Description Present when the user is actively dragging.
`data-pointing`	—
Description Present when the pointer is over the slider.
`data-interactive`	—
Description Present when dragging, pointing, or focus is active.
`data-orientation`	`'horizontal' \| 'vertical'`
Description Current axis of slider movement (`horizontal` or `vertical`).
`data-disabled`	—
Description Present when the slider is non-interactive.

CSS custom properties

Variable	Description
`--media-slider-fill`	Fill level percentage (0–100).
`--media-slider-pointer`	Pointer position percentage (0–100).
`--media-slider-buffer`	Buffer level percentage (0–100).

Events

Event	Description
`drag-end`	Fired when a pointer drag ends.
`drag-start`	Fired when a pointer drag starts.
`value-change`	Fired while the slider value changes during an interaction.
`value-commit`	Fired when an interaction commits the slider value.

media-slider-buffer

Displays the buffered range on the slider track.

media-slider-fill

Displays the filled portion from start to the current value.

media-slider-preview

Positioning container for preview content that tracks the pointer along the slider.

Props

Prop	Type	Default	Details
`overflow`	`'clamp' \| 'visible'`	—
Description How the preview handles slider boundaries. `clamp` keeps it within bounds; `visible` lets it extend past them.

Data attributes

Attribute	Type	Details
`data-dragging`	—
Description Present when the user is actively dragging.
`data-pointing`	—
Description Present when the pointer is over the slider.
`data-interactive`	—
Description Present when dragging, pointing, or focus is active.
`data-orientation`	`'horizontal' \| 'vertical'`
Description Current axis of slider movement (`horizontal` or `vertical`).
`data-disabled`	—
Description Present when the slider is non-interactive.

media-slider-thumb

Draggable handle for setting the slider value. Receives focus and handles keyboard interaction.

Data attributes

Attribute	Type	Details
`data-dragging`	—
Description Present when the user is actively dragging.
`data-pointing`	—
Description Present when the pointer is over the slider.
`data-interactive`	—
Description Present when dragging, pointing, or focus is active.
`data-orientation`	`'horizontal' \| 'vertical'`
Description Current axis of slider movement (`horizontal` or `vertical`).
`data-disabled`	—
Description Present when the slider is non-interactive.

media-slider-track

Contains the slider's visual track and interactive hit zone.

media-slider-value

Writes the formatted current or pointer slider value into its own text content, replacing any children.

Props

Prop	Type	Default	Details
`type`	`'current' \| 'pointer'`	—
Description Which slider value to display: the current position or the pointer position.

Data attributes

Attribute	Type	Details
`data-dragging`	—
Description Present when the user is actively dragging.
`data-pointing`	—
Description Present when the pointer is over the slider.
`data-interactive`	—
Description Present when dragging, pointing, or focus is active.
`data-orientation`	`'horizontal' \| 'vertical'`
Description Current axis of slider movement (`horizontal` or `vertical`).
`data-disabled`	—
Description Present when the slider is non-interactive.

media-slider-thumbnail

<media-thumbnail> whose time follows the slider pointer. Left empty, it draws an image of its own; supply an <img> child to compose overlays or loading indicators beside the image it controls.