media-time-slider

A slider component for seeking through media playback time

Anatomy

<media-time-slider></media-time-slider>

Behavior

Displays and controls the current playback position. Dragging the slider seeks the media. The fill level reflects currentTime / duration as a percentage, and the buffer level shows how much media has been buffered.

Value changes during drag are throttled via the changeThrottle prop (default 100ms) using a leading+trailing throttle to keep the UI responsive without overwhelming the media element.

Styling

Use CSS custom properties to style the fill, pointer, and buffer levels:

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

Use data-seeking to style during active seek operations:

media-time-slider[data-seeking] {
  opacity: 0.8;
}

Accessibility

Renders with role="slider" and automatic aria-label of “Seek”. Override with the label prop. Keyboard controls:

Arrow Left / Arrow Right: step by step increment
Page Up / Page Down: step by largeStep increment
Home: seek to start
End: seek to end

Examples

Nest sub-components for full control over the slider’s DOM structure. This example includes a track, fill bar, buffer indicator, draggable thumb, and a tooltip that shows the pointed-at time.

<video-player class="html-time-slider-parts">
    <media-container>
        <video
            src="https://stream.mux.com/BV3YZtogl89mg9VcNBhhnHm02Y34zI1nlMuMQfAbl3dM/highest.mp4"
            autoplay
            muted
            playsinline
            loop
        ></video>
        <media-time-slider class="html-time-slider-parts__slider">
            <media-slider-track class="html-time-slider-parts__track">
                <media-slider-buffer class="html-time-slider-parts__buffer"></media-slider-buffer>
                <media-slider-fill class="html-time-slider-parts__fill"></media-slider-fill>
            </media-slider-track>
            <media-slider-thumb class="html-time-slider-parts__thumb"></media-slider-thumb>
            <media-slider-value type="pointer" class="html-time-slider-parts__value"></media-slider-value>
        </media-time-slider>
    </media-container>
</video-player>

.html-time-slider-parts,
.html-time-slider-parts media-container {
  display: block;
  position: relative;
}

.html-time-slider-parts video {
  width: 100%;
}

.html-time-slider-parts__slider {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  display: flex;
  align-items: center;
  height: 20px;
  cursor: pointer;
}

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

.html-time-slider-parts__slider[data-interactive] .html-time-slider-parts__track {
  height: 6px;
}

.html-time-slider-parts__buffer {
  position: absolute;
  top: 0;
  left: 0;
  height: 100%;
  width: var(--media-slider-buffer);
  background: rgba(255, 255, 255, 0.4);
  border-radius: 9999px;
}

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

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

.html-time-slider-parts__slider[data-interactive] .html-time-slider-parts__thumb {
  transform: translateX(-50%) scale(1);
}

.html-time-slider-parts__slider[data-dragging] .html-time-slider-parts__thumb {
  transform: translateX(-50%) scale(1.1);
}

.html-time-slider-parts__value {
  position: absolute;
  left: var(--media-slider-pointer);
  bottom: 100%;
  transform: translateX(-50%);
  margin-bottom: 6px;
  background: rgba(0, 0, 0, 0.8);
  color: white;
  font-size: 12px;
  padding: 2px 6px;
  border-radius: 4px;
  pointer-events: none;
  white-space: nowrap;
  opacity: 0;
  transition: opacity 150ms ease;
}

.html-time-slider-parts__slider[data-pointing] .html-time-slider-parts__value {
  opacity: 1;
}

import '@videojs/html/video/player';
import '@videojs/html/ui/time-slider';

API Reference

media-time-slider

Props

Prop	Type	Default
`changeThrottle`	`number`	`100`
Attribute `change-throttle` Description Leading+trailing throttle (ms) for `onValueChange` during drag.
`disabled`	`boolean`	`—`
Attribute `disabled` Description Whether the slider is non-interactive.
`label`	`string \| function`	`'Seek'`
Attribute `label` Description Custom label for the slider. Type `string \| ((state: SliderState) => string)`
`largeStep`	`number`	`—`
Attribute `large-step` Description Large step increment (Page Up/Down keys).
`max`	`number`	`—`
Attribute `max`
`min`	`number`	`—`
Attribute `min`
`orientation`	`'horizontal' \| 'vertical'`	`—`
Attribute `orientation` Description Axis of slider movement.
`step`	`number`	`—`
Attribute `step` Description Step increment for value changes (arrow keys).
`thumbAlignment`	`'center' \| 'edge'`	`—`
Attribute `thumb-alignment` Description How the thumb aligns at the track edges. `edge` constrains the thumb within track bounds.
`value`	`number`	`—`
Attribute `value`

State

State is reflected as data attributes for CSS styling.

Property	Type	Details
`bufferPercent`	`number`
Description Buffered amount as a percentage of duration (0–100).
`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 or pointing 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.
`seeking`	`boolean`
Description Whether a seek operation is in progress.
`duration`	`number`
Description Total duration in seconds (0 if unknown).
`currentTime`	`number`
Description Current playback position in seconds.

Data attributes

Attribute	Type	Details
`data-seeking`
Description Present when a seek operation is in progress.

CSS custom properties

Variable	Details
`--media-slider-fill`
Description Fill level percentage (0–100), representing current playback position.
`--media-slider-pointer`
Description Pointer position percentage (0–100), tracking the cursor along the slider.
`--media-slider-buffer`
Description Buffer level percentage (0–100), indicating how much media has been buffered.

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`	`SliderPreviewOverflow`	`—`
Attribute `overflow` Description How the preview handles the slider boundaries. `'clamp'` keeps the preview within bounds, `'visible'` allows it to extend beyond the 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 or pointing 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 or pointing 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

Displays a formatted text representation of the slider value. Renders an <output> element.

Props

Prop	Type	Default
`format`	`((value: number) => string)`	`—`
Attribute `format` Description Custom formatter for the displayed value. Overrides the root's `formatValue`.
`type`	`"current" \| "pointer"`	`—`
Attribute `type` 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 or pointing 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.