shinyCohortBuilder (version 0.4.0)

.cb_input: Create input controller insensitive to server updates

Description

Input controllers created with `.cb_input` are sending its value to server only when user changes it's value directly in browser. That means all the `update*` functions have only visible effect on application output.

The method should be used for each filter input controller and precise which filter value should be updated when the input selection is changes.

Usage

.cb_input(ui, data_param, ..., priority = NULL)

Value

A `shiny.tag` object defining html structure of filter input container.

Arguments

ui

UI defining input controllers.

data_param

Name of the parameter that should be updated in filter whenever user change the input value.

...

Extra attributes passed to the input div container.

priority

Set to 'event' to force sending value.

Examples

if (interactive()) {
  library(shiny)
  library(shinyCohortBuilder)

  shiny::addResourcePath(
    "shinyCohortBuilder",
    system.file("www", package = "shinyCohortBuilder")
  )
  ui <- fluidPage(
    tags$head(
      shiny::tags$script(type = "text/javascript", src = file.path("shinyCohortBuilder", "scb.js"))
    ),
    actionButton("update", "Update with random value"),
    div(
      class = "cb_container",
      `data-ns_prefix` = "",
      div(
        class = "cb_step",
        `data-step_id` = "1",
        div(
          class = "cb_filter",
          `data-filter_id` = "filid",
          .cb_input(
            numericInput("val", "Value", value = 1),
            data_param = "range"
          )
        )
      )
    )
  )

  server <- function(input, output, session) {
    observeEvent(input$action, {
      # print should be avoided when value is changed due to update
      print(input$action)
    })
    observeEvent(input$update, {
      updateNumericInput(session, "val", value = rnorm(1))
    })
  }

  shinyApp(ui, server)
}