shinybiocloader: CSS loader for shiny apps
Author: Marcel Ramos
Date: 2026-04-28

# shinybiocloader

This package is intended for shiny app developers. It provides a simple way to add a loading animation to a shiny application when processing data or rendering outputs.

# Installation

    if (!requireNamespace("BiocManager", quietly = TRUE))
        install.packages("BiocManager")
    BiocManager::install("shinybiocloader")

# Usage

You can use the `withLoader` function to wrap any UI element that you want to display a loader for. The loader can be specified by its name, such as “biocspin” though there is only one loader in the package currently.

    library(shiny)
    library(shinybiocloader)
    ui <- fluidPage(
        titlePanel("shinybiocloader demo"),
        sidebarLayout(
            sidebarPanel(
                actionButton("load_data", "Load Data")
            ),
            mainPanel(
                withLoader(
                    plotOutput("plot"), loader = "biocspin"
                )
            )
        )
    )
    server <- function(input, output) {
        observeEvent(input$load_data, {
            output$plot <- renderPlot({
                hist(rnorm(1000), main = "Random Normal Distribution")
            })
        })
    }
    shinyApp(ui = ui, server = server)

# Session Information

    sessionInfo()

    R version 4.6.0 Patched (2026-04-24 r89963)
    Platform: aarch64-apple-darwin23
    Running under: macOS Tahoe 26.3.1

    Matrix products: default
    BLAS:   /Library/Frameworks/R.framework/Versions/4.6/Resources/lib/libRblas.0.dylib
    LAPACK: /Library/Frameworks/R.framework/Versions/4.6/Resources/lib/libRlapack.dylib;  LAPACK version 3.12.1

    locale:
    [1] C/en_US.UTF-8/en_US.UTF-8/C/en_US.UTF-8/en_US.UTF-8

    time zone: America/New_York
    tzcode source: internal

    attached base packages:
    [1] stats     graphics  grDevices utils     datasets  methods   base

    loaded via a namespace (and not attached):
     [1] compiler_4.6.0  fastmap_1.2.0   cli_3.6.6       tools_4.6.0
     [5] htmltools_0.5.9 otel_0.2.0      yaml_2.3.12     rmarkdown_2.31
     [9] knitr_1.51      jsonlite_2.0.0  xfun_0.57       digest_0.6.39
    [13] rlang_1.2.0     png_0.1-9       evaluate_1.0.5