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Collaborative textarea server

Source: R/textarea.R
textarea_server.Rd

Server logic for a collaborative textarea that synchronizes across Shiny sessions using Automerge CRDT.

Usage

textarea_server(id, doc_id = "default", initial_text = "", debounce_ms = 150)

Arguments

id

Module ID (must match the ID used in textarea_ui()).

doc_id

Document identifier. All textareas with the same doc_id synchronize together. Default is "default".

initial_text

Initial text content. Only used when creating a new document; ignored if the document already exists.

debounce_ms

Debounce delay in milliseconds for text input changes. Default is 150ms.

Value

A reactive expression returning the current synchronized text.

Details

This module uses Shiny's reactive system to synchronize text across multiple browser sessions without requiring an external sync server. Each session maintains a local Automerge document that syncs with a shared master document using Automerge's sync protocol.

Concurrent edits are automatically merged using Automerge's CRDT algorithm, ensuring eventual consistency across all sessions.

See also

Other textarea: textarea_ui()

Examples

if (interactive()) {
  ui <- shiny::fluidPage(textarea_ui("editor"))
  server <- function(input, output, session) textarea_server("editor")
  shiny::shinyApp(ui, server)
}