RenderImage From URL And Clickable

I would like to figure out how to use renderImage in Shiny with online located images (URL), and make the image clickable, so that I can hang an observeEvent() to it. I can do both

Solution 1:

One alternative is to use the onclick function from shinyjs library. It allows you to include click events to specific html elements (targeted by id).

Here's the documentation

In your case the code would look like this:

library(shiny)
library(shinyjs)

ui <- fluidPage(
  useShinyjs(),
  uiOutput("image1", click = "MyImage")
)

server <- function(input, output, session) {

  output$image1<- renderUI({
    imgurl2 <- "https://www.rstudio.com/wp-content/uploads/2014/07/RStudio-Logo-Blue-Gradient.png"

    div(id = "myImage",
      tags$img(src = imgurl2, width = 200, height = 100)
    )
  })
  onclick(
    myImage, 
    { 
      # Do whatever you want!
      print("Hey there")
    }
  )
}

shinyApp(ui, server)

Solution 2:

What about transforming image from url into a ggplot as:

library(magick)
library(cowplot)
library(gtools)
library(shiny)

ui <- fluidPage(
  uiOutput("myplotoutput"),
  uiOutput("text")  
)

server <- function(input, output, session) {
  output$myplotoutput = renderUI( {
    plotOutput("urlimage", click=clickOpts(id="myclick") )
}  )

output$text=renderUI({
    validate(
      need(try(!invalid(input$myclick)), "Text will appear here")
    )
    textOutput("reactext")
})

output$reactext<-renderText(mytext$texto)

output$urlimage<- renderPlot({
g<-  ggdraw() +   draw_image("https://jeroen.github.io/images/frink.png")
g
})

mytext<-reactiveValues()  

observeEvent(input$myclick, {
    mytext$texto<-"Hey there"
})
} 

shinyApp(ui, server)