Title: R Shiny: Present a ShinyBS Modal Popup on page visit (no user action)
Tags: r;shiny;shinybs
Question: I used bsModal successfully in my code before. However, I can't seem to get a modal pop up to show just when the user visits an app's first page by default. I thought something like this would work, but not. Any idea how I can trigger a bsModal on page visit?
library(shiny)
library(shinyBS)
ui <- fluidPage(
mainPanel(
bsModal(id = 'startupModal', title = 'Dum Dum', trigger = '',
size = 'large', p("here is my mumbo jumbo")),
width = 12
server <- function(input, output, session) {
shinyApp(ui = ui, server = server)
I simply need to alert the user with a message when they visit the app and then allow them to close the modal pop up and navigate the rest of the app freely. I am using Shinydashboard. So, eventually, this has to work with that.

Here is the accepted answer: You can use toggleModal to manually trigger the popup from the server.
library(shiny)
library(shinyBS)
ui <- fluidPage(
mainPanel(
bsModal(id = 'startupModal', title = 'Dum Dum', trigger = '',
size = 'large', p("here is my mumbo jumbo")),
width = 12
server <- function(input, output, session) {
toggleModal(session, "startupModal", toggle = "open")
shinyApp(ui = ui, server = server)
Comment for this answer: Very interesting. It also only renders the modal pop-up once per session and not each time I land on the specific page I put it on. Are there any side effects I need to worry about, or code properly for?
Comment for this answer: You can control when to show/close the pop-up using an `observer`. To close it use `toggle = "close"`.

Here is another answer: Here is a solution using JS to trigger bsModal when page load "onload" from ui without waiting for the server. Along with a solution proposed here to prevent end users from accidentally closing the modal by clicking outside the modal or press Esc
library(shiny)
library(shinyBS)
bsModalNoClose <-function(...) {
b = bsModal(...)
b[[2]]$`data-backdrop` = "static"
b[[2]]$`data-keyboard` = "false"
return(b)
ui <- fluidPage(
sidebarLayout(
sidebarPanel(
bsModalNoClose("window", "Window",
title="Enter Login Details",size='small',
textInput('username', 'Username'),
passwordInput('pwInp', 'Password'),
actionButton('butLogin', 'Login', class = 'btn action-button btn-success', icon = icon('sign-in')),
footer = h4(actionLink('create_account','Create an account'),align='right'),
tags$head(tags$style("#window .modal-footer{display:none}
.modal-header .close{display:none}"),
tags$script("$(document).ready(function(){
$('#window').modal();
});")
))
)
,mainPanel()
server <- function(input, output, session) {}
shinyApp(ui, server)
I hope it may be helpful for future readers.
Comment for this answer: @A.Suliman, This solution was useful. I followed to your github but I don't see user credentials saved, how to setup the email delivery in R when you sign up ?
Comment for this answer: @enigma6174 I am glad you find it useful. I create a github repository [here](https://github.com/AbubakerSuliman/Shiny-login-page)  for my login page which I made using different parts from different contributors in SO and github. However it need more future work.
Comment for this answer: @user5249203 thanks. Users credentials will be saved in an SQlite DB called `users` at `www/sqlite`  folder 'for production you may need more persistent location'. To send an Email install `rJava`, `mailR` then uncomment the following [part](https://github.com/AbubakerSuliman/Shiny-login-page/blob/9c8a83e60397b811e43df6231963074eb185b563/server.R#L153), finally provide a valid Gmail user name and pwd
Comment for this answer: WOW!! I was trying to do the same thing with shinyalert but this is too good! Also, if you could provide a guide on how to complete the authentication of username/password and the signup process, that would be really helpful.

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