Created
August 26, 2024 16:29
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Shiny module for paging through a faceted ggplot2 plot
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| # Create facet page slider module UI | |
| facetPageUI <- function(id) { | |
| tagList( | |
| sliderInput( | |
| NS(id, "facet_page"), | |
| "Facet page:", | |
| value = 1, | |
| min = 1, | |
| max = 2, | |
| step = 1, | |
| pre = "Page ", | |
| ticks = FALSE | |
| ) | |
| ) | |
| } | |
| # Create module server for facet page slider | |
| facetPageServer <- function(id, plot, facets, ncol = 4, nrow = 3) { | |
| moduleServer(id, function(input, output, session) { | |
| p_temp <- plot + facet_wrap_paginate(facets, | |
| ncol = ncol, nrow = nrow, | |
| page = input$facet_page) | |
| # Only use pagination when the number of facets exceeds 12; this keeps | |
| # the UI clean. | |
| if (n_pages(p_temp) > 1) { | |
| p <- p_temp | |
| updateSliderInput(inputId = "facet_page", max = n_pages(p_temp)) | |
| } else { | |
| p <- plot + facet_wrap(facets, ncol = ncol, nrow = nrow) | |
| } | |
| list( | |
| plot = p, | |
| n_pages = n_pages(p_temp) | |
| ) | |
| }) | |
| } | |
| # Generate an app with facet page slider UI and server modules for testing and experimentation | |
| facetPageApp <- function() { | |
| ui <- fluidPage( | |
| facetPageUI("facet_page"), | |
| plotOutput("plot") | |
| ) | |
| server <- function(input, output, session) { | |
| output$plot <- renderPlot({ | |
| p <- ggplot(iris, aes(Sepal.Width, Sepal.Length)) + | |
| geom_point() | |
| facet_page <- facetPageServer("facet_page", p, c("Species"), ncol = 1, nrow = 1) | |
| facet_page$plot | |
| }) | |
| } | |
| shinyApp(ui, server) | |
| } | |
| facetPageApp() |
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