> For the complete documentation index, see [llms.txt](https://docs.nosto.com/ugc/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.nosto.com/ugc/api-docs/javascript/digital-screens/api-reference.md). # API Reference * [API Specification](https://web.archive.org/web/20230130205754/https://developer.stackla.com/api-docs/javascript/events/reference/#api-specs) * [StacklaEventScreens.Base](https://web.archive.org/web/20230130205754/https://developer.stackla.com/api-docs/javascript/events/reference/#base) * [StacklaEventscreens.Carousel](https://web.archive.org/web/20230130205754/https://developer.stackla.com/api-docs/javascript/events/reference/#ses-carousel) * [StacklaEventscreens.Mosaic](https://web.archive.org/web/20230130205754/https://developer.stackla.com/api-docs/javascript/events/reference/#ses-mosaic) * [Additional Information](https://web.archive.org/web/20230130205754/https://developer.stackla.com/api-docs/javascript/events/reference/#other) ### API Specification This section is reserved for future specification of each area of the JavaScript API. ### StacklaEventscreens.Base All the Event Screen type classes extend `StacklaEventScreens.Base`. #### Configurable Options | Name | Default | Description | | ---------------- | ------------- | ------------------------------------------------------------------------------- | | appendRoot | ‘#container’ | CSS selector of tiles being appended to. | | debug | 0 | Whether or not to enable showing the debugging logs. | | enableImageCheck | 0 | Whether or not to enable minimal image size filter. | | listUrl | <$list\_url> | Data service URL. | | filterId | <$filter\_id> | Filter ID. You can switch to use a different filter to load different data set. | | imageMinHeight | null | Minimum image height. It only takes effect when enableImageCheck is turned on. | | imageMinWidth | null | Minimum image width. It only takes effect when enableImageCheck is turned on. | | queueLength | 30 | Available items in queue, not including pinned tiles. | | template | ‘#template’ | CSS selector of Tile Mustache template. | #### Properties | Name | Type | Description | | ------------ | -------------- | ------------------------------------------------------ | | dataProvider | \ | The utility facilitates data requests with API server. | #### Methods | Name | Params | Return | Description | | ------- | -------------------- | --------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ | | log | message, type | (void) | A convenient logging method. Only output to developer console when `debug` is enabled. | | emit | eventName, args | (void) | Triggers an event. | | on | eventName, handlerFn | (void) | Subscribes to an event. | | init | | void | Init lifecycle method, invoked during construction. Sets up attributes and invokes initializers for this Event Screen type. | | bind | | void | Bind lifecycle method, invoked during construction. Binds event handlers for this Event Screen type. | | render | container, html | (void) |

Establishes the initial DOM for the Event Screen type.
Invoking this method will lead to the creating of all DOM elements for the Event Screen.
This method should only be invoked once for an initialized Event Screen.

| | iterate | i, data | \ | Invoked by render method. Focuses on generating HTML of an individual tile. | **Method Usage** All Event Screen types have defined `init`, `bind`, `iterate`, and `render`\ lifecycle methods. You can overwrite it through prototype chain for any customization reasons. For example, the Carousel Event Screen uses [slick.js](https://web.archive.org/web/20230130205754/http://kenwheeler.github.io/slick/) to achieve carousel effect.\ You may want to use another JavaScript utility to achieve this. ``` StacklaEventscreens.Carousel.prototype.render = function (container, html) { var slider = Sliderman.slider({ container: container.attr('id'), // Other attributes.... }; } ``` #### Events | Name | Params | Description | | ------------- | ---------------------------- | ------------------------------------------------------------- | | init | instance | It triggers after an instance being initialized. | | load | listData | It triggers after first data being received. | | beforeRender | $appendRoot, listData | It triggers before starting to parse any tile HTML. | | beforeIterate | tileData, tileID | It triggers before starting to parse an individual tile HTML. | | iterate | tileData, tileHTML | It triggers after a tile HTML being generated. | | beforeAppend | $tile, tileData, $appendRoot | It triggers before an individual tile being appended. | | append | $tile, tileData, $appendRoot | It triggers after an individual tile being appended. | | render | $appendRoot, listData | It triggers after instance being initialized. | | message | addedData, removeIDList | It triggers when new data being received. | **Event Usage** The recommended way of subscribing an event is to use the `on` method. ``` var eventScreen = new StacklaEventscreens.Wall(); eventScreen.on('append', function (e, $tile, $container) { /* do something… */ }); eventScreen.on('beforeAppend', function (e, $tile, $container) { /* do something… */ }); ``` Also, all the above events can be subscribed via *configuration options*. ``` var eventScreen = new StacklaEventscreens.Wall({ onInit: function (instance) {}, onLoad: function (data) {}, onIterate: function (tile, html) {}, onRender: function (container, data, html) {}, onMessage: function (data, ids) {} }; ``` [Back to Top](https://web.archive.org/web/20230130205754/https://developer.stackla.com/api-docs/javascript/events/reference/#top) ### StacklaEventscreens.Carousel #### Events Except the events which Base provides, it also has the following unique events. | Name | Params | Description | | ---------------- | --------------------------- | -------------------------------- | | beforeTransition | slick, prevIndex, nextIndex | It triggers before a transition. | | transition | slick, index | It triggers after a transition. | [Back to Top](https://web.archive.org/web/20230130205754/https://developer.stackla.com/api-docs/javascript/events/reference/#top) ### StacklaEventscreens.Mosaic #### Events Except the events which Base provides, it also has the following unique events. | Name | Params | Description | | ---------------- | ---------------------- | -------------------------------- | | beforeTransition | $prevGroup, $nextGroup | It triggers before a transition. | | transition | $nextGroup | It triggers after a transition. | [Back to Top](https://web.archive.org/web/20230130205754/https://developer.stackla.com/api-docs/javascript/events/reference/#top) ### Additional Information #### Sample Code Say if you want to make a custom eventscreen called Zoom Wall, you can extend StacklaEventscreens.Base. *stackla\_eventscreens\_zoomwall.js* ``` function ZoomWall(attrs) { StacklaEventscreens.Base.call(this, attrs); // Define some attributes you want to use this.delay = attrs.delay || 5000; } ZoomWall.prototype = Object.create(StacklaEventscreens.Base.prototype); ZoomWall.prototype.constructor = ZoomWall; ZoomWall.prototype.NAME = 'stackla.eventscreens.zoomwall'; ZoomWall.prototype.init = function () { // Maybe handles the new arriving messages. this.on('message', function (e) { // Update tiles... }); }; ZoomWall.prototype.render = function (container, html) { // Maybe update HTML structure in container. container.html('
' + html + '
'); }; StacklaEventscreens.ZoomWall = ZoomWall; ``` [Back to Top](https://web.archive.org/web/20230130205754/https://developer.stackla.com/api-docs/javascript/events/reference/#top)