I am looking at customizing the showNotification()
functionality from Shiny.
https://gallery.shinyapps.io/116-notifications/
I would like the message to be generated in the middle of the screen as opposed to the bottom-right. I don't think this can be set natively but I am hoping someone would have a suggestion of how to accomplish this.
You can use tags$style
to overwrite the CSS class properties (in this case: .shiny-notification
). You could also adjust other properties like width and height with that approach.
The css part would be:
.shiny-notification {
position:fixed;
top: calc(50%);
left: calc(50%);
}
that sets the notification to 50% of screen width and 50% height width.
You can include the css code in shiny by using the following in the ui
function.
tags$head(
tags$style(
HTML(CSS-CODE....)
)
)
A full reproducible app is below:
library(shiny)
shinyApp(
ui = fluidPage(
tags$head(
tags$style(
HTML(".shiny-notification {
position:fixed;
top: calc(50%);
left: calc(50%);
}
"
)
)
),
textInput("txt", "Content", "Text of message"),
radioButtons("duration", "Seconds before fading out",
choices = c("2", "5", "10", "Never"),
inline = TRUE
),
radioButtons("type", "Type",
choices = c("default", "message", "warning", "error"),
inline = TRUE
),
checkboxInput("close", "Close button?", TRUE),
actionButton("show", "Show"),
actionButton("remove", "Remove most recent")
),
server = function(input, output) {
id <- NULL
observeEvent(input$show, {
if (input$duration == "Never")
duration <- NA
else
duration <- as.numeric(input$duration)
type <- input$type
if (is.null(type)) type <- NULL
id <<- showNotification(
input$txt,
duration = duration,
closeButton = input$close,
type = type
)
})
observeEvent(input$remove, {
removeNotification(id)
})
}
)
The app template used below i took from the code in the link you provided.
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