web scraping using shiny app

[omarh2m]

hello everyone I'm hoping if someone can help me with this
so instead of looping for all of elements inside WEBelements as it shown in the code below , I want if there's a possibility to implement a gadget in a shiny app that I can select in it a number for example the 9th element of WEBelements and do the following scraping

library(shiny)
library(RSelenium)
library(tidyverse)
library(rvest)


ui <- fluidPage(
  actionButton("go", "Scrape")
)
server <- function(input, output, session) {
  observeEvent(input$go, {
    rD <- rsDriver(browser=c("firefox"), port=4444L,verbose = F)
    remDr <- rD[["client"]]
    remDr <- rD$client
    
    # Open browser session
    remDr$open()
    url<-"http://www.bvmt.com.tn/fr/entreprises/list"
    remDr$navigate(url) 
    # Click on links and scrape some stuff
    WEBelements <- remDr$findElements("id", "pano-societe")
    for (i in 1:length(WEBelements)) {
      remDr$navigate(url)
      WEBelements <- remDr$findElements("id", "pano-societe")
      WEBelements[[i]]$clickElement()
      Sys.sleep(2)
      webElem1 <- remDr$findElement("css selector", "li.tt2:nth-child(14) > a:nth-child(1)")
      webElem1$clickElement()
      Sys.sleep(1)
      elements2 <- remDr$findElements("class", "savoir-plus-actu")
      elements2[[1]]$clickElement()
      Sys.sleep(2)
      CurrentUrl<-remDr$getCurrentUrl()
      page<-read_html(CurrentUrl[[1]])
      raw_list<- page %>% 
        html_nodes("a") %>% 
        html_attr("href") %>% 
        str_subset("\\.pdf") %>%
        walk2(., basename(.), download.file, mode = "wb") 
    }
    # Close browser session
    remDr$close()
  })
}

shinyApp(ui, server)