我試圖在R閃亮應用程序中從列表中反應顯示圖像。R Shiny Reactively顯示列表中的圖像
我有很多.tiff圖像存儲在我的應用程序的「www」目錄。他們遵循的命名約定OHC_130.tiff,OHC_131.tiff,OHC_132.tiff,IHC_133.tiff,Deiter_134.tiff,OHC_135.tiff等等
我也有包含所有這些名字的矢量
ImgID_Vector <- as.vector(c("OHC_130", "OHC_131", "OHC_132", "IHC_133", "Deiter_134", "OHC_135")
我想做一個可選擇的輸入下拉列表,這樣用戶可以選擇圖像然後點擊提交按鈕使圖像顯示在下面。我已經爲ui.r設置了這個,但我不確定如何使它在服務器端工作。
#ui.r
library(shiny)
library(shinydashboard)
dashboardBody(
tabItems(
tabItem(tabName = "dt",
h2("Select an image"),
fluidRow(
box(title="This is a searchable database of images", solidHeader = TRUE,status = "primary"),
selectInput("input$ImageIDVariable1", label = h4("Enter your image of interest"), choices = (ImgID_Vector), multiple = TRUE),
submitButton("Submit"),
imageOutput("ImageID_Image")
)
)
)
概念我知道,在服務器端,我需要用戶輸入從UI端連接到實際圖像中「www」的文件夾。我應該能夠使用無功輸入和renderImage來做到這一點,我認爲。但我不知道如何編寫render image命令來實現所需的結果。
#server.r
#This is the data that contains the choices for the dropdown menu
ImgID_Vector <- readRDS("ImgID_Vector.RDS")
shinyServer(function(input, output) {
# This is where I am struggling, with the render image command
output$ImageID_Image <- renderImage({
filename <- normalizePath(file.path('./www',
paste(input$ImageIDVariable1, '.tiff', sep='')))
list(src = filename)
}, deleteFile = FALSE)
}
#This is where I have the reactive input variable
ImageIDVariable1 <- reactive({input$ImageIDVariable1})
})
感謝您的幫助!