new_file_block: File block constructors

In blockr.core: Graphical Web-Framework for Data Manipulation and Visualization

File block constructors

Description

Similarly to new_data_block(), blocks created via new_file_block() serve as starting points in analysis pipelines by providing data to down-stream blocks. They typically will not have data inputs and represent root nodes in analysis graphs.

Usage

new_file_block(server, ui, class, ctor = sys.parent(), ...)

new_filebrowser_block(
  file_path = character(),
  volumes = c(home = path.expand("~")),
  ...
)

new_upload_block(...)

Arguments

server	A function returning shiny::moduleServer()
ui	A function with a single argument (ns) returning a shiny.tag
class	Block subclass
ctor	String-valued constructor name or function/frame number (mostly for internal use or when defining constructors for virtual classes)
...	Forwarded to new_file_block() and new_block()
file_path	File path
volumes	Parent namespace

Value

All blocks constructed via new_file_block() inherit from file_block.

File browser block

In order to make user data available to blockr, this block provides file- upload functionality via shiny::fileInput(). Given that data provided in this way are only available for the life-time of the shiny session, exported code is not self-contained and a script containing code from an upload block is cannot be run in a new session. Also, serialization of upload blocks is currently not allowed as the full data would have to be included during serialization.

Upload block

In order to make user data available to blockr, this block provides file- upload functionality via shiny::fileInput(). Given that data provided in this way are only available for the life-time of the shiny session, exported code is not self-contained and a script containing code from an upload block is cannot be run in a new session. Also, serialization of upload blocks is currently not allowed as the full data would have to be included during serialization.

blockr.core documentation built on June 8, 2025, 1:43 p.m.