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SliDesk

SliDesk API (window.slidesk)

slidesk/slidesk

SliDesk API (`window.slidesk`)

Plugins and scripts interact with the presentation at runtime through the global window.slidesk object. The available properties differ between the presentation view (index.html) and the speaker/notes view (notes.html).

Presentation view (`index.html`)

Property / Method	Type	Description
`slides`	NodeList	All `.sd-slide` elements
`currentSlide`	number	Index of the current slide
`env`	object	Full configuration from `slidesk.toml`
`domain`	string	Current domain (from `slidesk.DOMAIN` or `"localhost"`)
`deployed`	boolean	`true` when exported via `slidesk save`
`lastAction`	string	Last navigation action (`"next"` / `"previous"`)
`animationTimer`	number	Transition duration in ms (from `slidesk.TRANSITION`, default `300`)
`io`	WebSocket	WebSocket connection to the server (`/ws`), `undefined` on `file://`
`channel`	BroadcastChannel	BroadcastChannel fallback (`"slidesk_sync"`), set by `setupChannel()`
`next()`	function	Go to next slide
`previous()`	function	Go to previous slide
`goto(num)`	function	Jump to a specific slide (number or `{data: number}`)
`fullscreen()`	function	Toggle fullscreen mode
`changeSlide()`	function	Apply current slide CSS, send sync data, call `onSlideChange()`
`cleanOldSlide(id)`	function	Remove `sd-current` and `no-sd-animation` classes from a slide
`saveCheckpoints()`	function	Save timer checkpoints to `localStorage`
`sendMessage(payload)`	function	Send `{action, payload}` via channel or WebSocket
`waitForSocketConnection(payload)`	function	Retry sending until WebSocket is open
`setupChannel()`	function	Create fallback `BroadcastChannel` for sync without a server
`onSlideChange()`	function	Called after each slide change (plugins can override via `onSlideChange` hook)
`timeoutResize`	number	Resize debounce timer reference
`touchStart`	number	Touch start X position (swipe gesture)
`touchMove`	number	Touch move X position (swipe gesture)

Speaker / Notes view (`notes.html`)

Property / Method	Type	Description
`io`	WebSocket	WebSocket connection to the server (`/ws`)
`channel`	BroadcastChannel	BroadcastChannel fallback (`"slidesk_sync"`), set by `setupChannel()`
`timer`	Element	`#sd-sv-timer` DOM element
`subtimer`	Element	`#sd-sv-subtimer` DOM element
`scrollPosition`	number	Current notes scroll position (px)
`checkpoints`	array	Timer checkpoints loaded from `localStorage`
`presentationPath`	string	Path to `index.html` derived from the notes URL
`getPresentationPath()`	function	Derive the presentation path from the current URL
`setupChannel()`	function	Create `BroadcastChannel` for fallback sync
`loadInitialState()`	function	Restore last slide and checkpoints from `localStorage`
`createButtons()`	async function	Create "Open presentation" buttons for each screen
`notes_up()`	function	Scroll notes up by 100px
`notes_down()`	function	Scroll notes down by 100px
`start_timer()`	function	Start the presentation timer
`onSpeakerViewSlideChange()`	function	Called after slide change in speaker view (resets scroll, runs plugin hooks)

Slide change lifecycle

When a slide change occurs (via next(), previous(), or goto()):

cleanOldSlide(currentSlide) — removes sd-current from the departing slide
The departing slide gets sd-previous
currentSlide is incremented/decremented
changeSlide() is called:
saveCheckpoints() persists timer data
New slide gets sd-current
location.hash is updated
Sync data (current, future, goto) is sent via WebSocket or BroadcastChannel
Images with data-src are loaded
onSlideChange() executes (fires any plugin hooks)