EVOLUTION-MANAGER

Edit File: onStop.html

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><title>R: Run code after an application or session ends</title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<link rel="stylesheet" type="text/css" href="R.css" />
</head><body>

<table width="100%" summary="page for onStop {shiny}"><tr><td>onStop {shiny}</td><td style="text-align: right;">R Documentation</td></tr></table>

<h2>Run code after an application or session ends</h2>

<h3>Description</h3>

<p>This function registers callback functions that are invoked when the
application exits (when <code><a href="runApp.html">runApp()</a></code> exits), or after each user
session ends (when a client disconnects).
</p>

<h3>Usage</h3>

<pre>
onStop(fun, session = getDefaultReactiveDomain())
</pre>

<h3>Arguments</h3>

<table summary="R argblock">
<tr valign="top"><td><code>fun</code></td>
<td>
<p>A function that will be called after the app has finished running.</p>
</td></tr>
<tr valign="top"><td><code>session</code></td>
<td>
<p>A scope for when the callback will run. If <code>onStop</code> is
called from within the server function, this will default to the current
session, and the callback will be invoked when the current session ends. If
<code>onStop</code> is called outside a server function, then the callback will
be invoked with the application exits. If <code>NULL</code>, it is the same as
calling <code>onStop</code> outside of the server function, and the callback will
be invoked when the application exits.</p>
</td></tr>
</table>

<h3>Value</h3>

<p>A function which, if invoked, will cancel the callback.
</p>

<p><code><a href="onFlush.html">onSessionEnded()</a></code> for the same functionality, but at
the session level only.
</p>

<h3>Examples</h3>

<pre>
## Only run this example in interactive R sessions
if (interactive()) {
  # Open this application in multiple browsers, then close the browsers.
  shinyApp(
    ui = basicPage("onStop demo"),

server = function(input, output, session) {
      onStop(function() cat("Session stopped\n"))
    },

onStart = function() {
      cat("Doing application setup\n")

onStop(function() {
        cat("Doing application cleanup\n")
      })
    }
  )
}
# In the example above, onStop() is called inside of onStart(). This is
# the pattern that should be used when creating a shinyApp() object from
# a function, or at the console. If instead you are writing an app.R which
# will be invoked with runApp(), you can do it that way, or put the onStop()
# before the shinyApp() call, as shown below.

## Not run: 
# ==== app.R ====
cat("Doing application setup\n")
onStop(function() {
  cat("Doing application cleanup\n")
})

shinyApp(
  ui = basicPage("onStop demo"),

server = function(input, output, session) {
    onStop(function() cat("Session stopped\n"))
  }
)
# ==== end app.R ====

# Similarly, if you have a global.R, you can call onStop() from there.
# ==== global.R ====
cat("Doing application setup\n")
onStop(function() {
  cat("Doing application cleanup\n")
})
# ==== end global.R ====

## End(Not run)
</pre>

<hr /><div style="text-align: center;">[Package <em>shiny</em> version 1.5.0 <a href="00Index.html">Index</a>]</div>
</body></html>