> For the complete documentation index, see [llms.txt](https://docs.videsk.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.videsk.io/es-developers/apps/ejemplos/eventos-en-vivo.md).
# Eventos en vivo
Este ejemplo cubre el [Patrón B](/es-developers/apps/broker.md#patron-b-broker-como-canal-continuo): la app conversa con el host durante toda la atención.
Casos típicos:
* La altura de tu UI cambia (un acordeón se abre, llega un resultado de búsqueda) y quieres que el iframe se ajuste.
* Tu app realiza una acción que el agente o un sistema externo quiere registrar como parte de la llamada (por ejemplo, "se creó un ticket"; "se actualizó el contacto").
## Auto-resize
Reporta la nueva altura cada vez que el contenido cambia, **no** en un setInterval.
```js
const sendHeight = () => {
window.parent.postMessage({
type: 'videsk:resize',
height: document.documentElement.scrollHeight,
}, '*');
};
new ResizeObserver(sendHeight).observe(document.documentElement);
window.addEventListener('load', sendHeight);
```
## Emitir un evento de negocio
```js
function onTicketCreated(ticket) {
window.parent.postMessage({
type: 'videsk:emit',
event: 'ticket.created',
payload: {
id: ticket.id,
url: ticket.url,
priority: ticket.priority,
},
}, '*');
}
```
Reglas para `videsk:emit`:
* `event` es un string libre que tú defines. Usa nombres con namespace (`ticket.created`, `lead.updated`) para no chocar con futuros eventos del propio Videsk.
* `payload` debe ser serializable a JSON.
* No esperes respuesta del host: `videsk:emit` es *fire-and-forget*.
## Ejemplo completo
```html
```
---
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