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<!-- Generated by pkgdown: do not edit by hand --><html lang="en"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><meta charset="utf-8"><meta http-equiv="X-UA-Compatible" content="IE=edge"><meta name="viewport" content="width=device-width, initial-scale=1.0"><title>Show or remove a notification — showNotification • shiny</title><!-- jquery --><script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.7.1/jquery.min.js" integrity="sha512-v2CJ7UaYy4JwqLDIrZUI/4hqeoQieOmAZNXBeQyjo21dadnwR+8ZaIJVT8EE2iyI61OV8e6M8PP2/4hpQINQ/g==" crossorigin="anonymous" referrerpolicy="no-referrer"></script><!-- Bootstrap --><link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.4.1/css/bootstrap.min.css" integrity="sha256-bZLfwXAP04zRMK2BjiO8iu9pf4FbLqX6zitd+tIvLhE=" crossorigin="anonymous"><script src="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.4.1/js/bootstrap.min.js" integrity="sha256-nuL8/2cJ5NDSSwnKD8VqreErSWHtnEP9E7AySL+1ev4=" crossorigin="anonymous"></script><!-- bootstrap-toc --><link rel="stylesheet" href="../bootstrap-toc.css"><script src="../bootstrap-toc.js"></script><!-- Font Awesome icons --><link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.12.1/css/all.min.css" integrity="sha256-mmgLkCYLUQbXn0B1SRqzHar6dCnv9oZFPEC1g1cwlkk=" crossorigin="anonymous"><link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.12.1/css/v4-shims.min.css" integrity="sha256-wZjR52fzng1pJHwx4aV2AO3yyTOXrcDW7jBpJtTwVxw=" crossorigin="anonymous"><!-- clipboard.js --><script src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.6/clipboard.min.js" integrity="sha256-inc5kl9MA1hkeYUt+EC3BhlIgyp/2jDIyBLS6k3UxPI=" crossorigin="anonymous"></script><!-- headroom.js --><script src="https://cdnjs.cloudflare.com/ajax/libs/headroom/0.11.0/headroom.min.js" integrity="sha256-AsUX4SJE1+yuDu5+mAVzJbuYNPHj/WroHuZ8Ir/CkE0=" crossorigin="anonymous"></script><script src="https://cdnjs.cloudflare.com/ajax/libs/headroom/0.11.0/jQuery.headroom.min.js" integrity="sha256-ZX/yNShbjqsohH1k95liqY9Gd8uOiE1S4vZc+9KQ1K4=" crossorigin="anonymous"></script><!-- pkgdown --><link href="../pkgdown.css" rel="stylesheet"><script src="../pkgdown.js"></script><meta property="og:title" content="Show or remove a notification — showNotification"><meta property="og:description" content="These functions show and remove notifications in a Shiny application."><meta property="og:image" content="/logo.png"><!-- mathjax --><script src="https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.5/MathJax.js" integrity="sha256-nvJJv9wWKEm88qvoQl9ekL2J+k/RWIsaSScxxlsrv8k=" crossorigin="anonymous"></script><script src="https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.5/config/TeX-AMS-MML_HTMLorMML.js" integrity="sha256-84DKXVJXs0/F8OTMzX4UR909+jtl4G7SPypPavF+GfA=" crossorigin="anonymous"></script><!--[if lt IE 9]>
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<h1>Show or remove a notification</h1>
<small class="dont-index">Source: <a href="https://github.com/rstudio/shiny/blob/rc-v1.11.1/R/notifications.R" class="external-link"><code>R/notifications.R</code></a></small>
<div class="hidden name"><code>showNotification.Rd</code></div>
</div>
<div class="ref-description">
<p>These functions show and remove notifications in a Shiny application.</p>
</div>
<div id="ref-usage">
<div class="sourceCode"><pre class="sourceCode r"><code><span><span class="fu">showNotification</span><span class="op">(</span></span>
<span> <span class="va">ui</span>,</span>
<span> action <span class="op">=</span> <span class="cn">NULL</span>,</span>
<span> duration <span class="op">=</span> <span class="fl">5</span>,</span>
<span> closeButton <span class="op">=</span> <span class="cn">TRUE</span>,</span>
<span> id <span class="op">=</span> <span class="cn">NULL</span>,</span>
<span> type <span class="op">=</span> <span class="fu"><a href="https://rdrr.io/r/base/c.html" class="external-link">c</a></span><span class="op">(</span><span class="st">"default"</span>, <span class="st">"message"</span>, <span class="st">"warning"</span>, <span class="st">"error"</span><span class="op">)</span>,</span>
<span> session <span class="op">=</span> <span class="fu"><a href="domains.html">getDefaultReactiveDomain</a></span><span class="op">(</span><span class="op">)</span></span>
<span><span class="op">)</span></span>
<span></span>
<span><span class="fu">removeNotification</span><span class="op">(</span><span class="va">id</span>, session <span class="op">=</span> <span class="fu"><a href="domains.html">getDefaultReactiveDomain</a></span><span class="op">(</span><span class="op">)</span><span class="op">)</span></span></code></pre></div>
</div>
<div id="arguments">
<h2>Arguments</h2>
<dl><dt id="arg-ui">ui<a class="anchor" aria-label="anchor" href="#arg-ui"></a></dt>
<dd><p>Content of message.</p></dd>
<dt id="arg-action">action<a class="anchor" aria-label="anchor" href="#arg-action"></a></dt>
<dd><p>Message content that represents an action. For example, this
could be a link that the user can click on. This is separate from <code>ui</code>
so customized layouts can handle the main notification content separately
from action content.</p></dd>
<dt id="arg-duration">duration<a class="anchor" aria-label="anchor" href="#arg-duration"></a></dt>
<dd><p>Number of seconds to display the message before it
disappears. Use <code>NULL</code> to make the message not automatically
disappear.</p></dd>
<dt id="arg-closebutton">closeButton<a class="anchor" aria-label="anchor" href="#arg-closebutton"></a></dt>
<dd><p>If <code>TRUE</code>, display a button which will make the
notification disappear when clicked. If <code>FALSE</code> do not display.</p></dd>
<dt id="arg-id">id<a class="anchor" aria-label="anchor" href="#arg-id"></a></dt>
<dd><p>A unique identifier for the notification.</p>
<p><code>id</code> is optional for <code>showNotification()</code>: Shiny will automatically create
one if needed. If you do supply it, Shiny will update an existing
notification if it exists, otherwise it will create a new one.</p>
<p><code>id</code> is required for <code>removeNotification()</code>.</p></dd>
<dt id="arg-type">type<a class="anchor" aria-label="anchor" href="#arg-type"></a></dt>
<dd><p>A string which controls the color of the notification. One of
"default" (gray), "message" (blue), "warning" (yellow), or "error" (red).</p></dd>
<dt id="arg-session">session<a class="anchor" aria-label="anchor" href="#arg-session"></a></dt>
<dd><p>Session object to send notification to.</p></dd>
</dl></div>
<div id="value">
<h2>Value</h2>
<p>An ID for the notification.</p>
</div>
<div id="ref-examples">
<h2>Examples</h2>
<div class="sourceCode"><pre class="sourceCode r"><code><span class="r-in"><span><span class="co">## Only run examples in interactive R sessions</span></span></span>
<span class="r-in"><span><span class="kw">if</span> <span class="op">(</span><span class="fu"><a href="https://rdrr.io/r/base/interactive.html" class="external-link">interactive</a></span><span class="op">(</span><span class="op">)</span><span class="op">)</span> <span class="op">{</span></span></span>
<span class="r-in"><span><span class="co"># Show a message when button is clicked</span></span></span>
<span class="r-in"><span><span class="fu"><a href="shinyApp.html">shinyApp</a></span><span class="op">(</span></span></span>
<span class="r-in"><span> ui <span class="op">=</span> <span class="fu"><a href="fluidPage.html">fluidPage</a></span><span class="op">(</span></span></span>
<span class="r-in"><span> <span class="fu"><a href="actionButton.html">actionButton</a></span><span class="op">(</span><span class="st">"show"</span>, <span class="st">"Show"</span><span class="op">)</span></span></span>
<span class="r-in"><span> <span class="op">)</span>,</span></span>
<span class="r-in"><span> server <span class="op">=</span> <span class="kw">function</span><span class="op">(</span><span class="va">input</span>, <span class="va">output</span><span class="op">)</span> <span class="op">{</span></span></span>
<span class="r-in"><span> <span class="fu"><a href="observeEvent.html">observeEvent</a></span><span class="op">(</span><span class="va">input</span><span class="op">$</span><span class="va">show</span>, <span class="op">{</span></span></span>
<span class="r-in"><span> <span class="fu">showNotification</span><span class="op">(</span><span class="st">"Message text"</span>,</span></span>
<span class="r-in"><span> action <span class="op">=</span> <span class="fu"><a href="https://rstudio.github.io/htmltools/reference/builder.html" class="external-link">a</a></span><span class="op">(</span>href <span class="op">=</span> <span class="st">"javascript:location.reload();"</span>, <span class="st">"Reload page"</span><span class="op">)</span></span></span>
<span class="r-in"><span> <span class="op">)</span></span></span>
<span class="r-in"><span> <span class="op">}</span><span class="op">)</span></span></span>
<span class="r-in"><span> <span class="op">}</span></span></span>
<span class="r-in"><span><span class="op">)</span></span></span>
<span class="r-in"><span></span></span>
<span class="r-in"><span><span class="co"># App with show and remove buttons</span></span></span>
<span class="r-in"><span><span class="fu"><a href="shinyApp.html">shinyApp</a></span><span class="op">(</span></span></span>
<span class="r-in"><span> ui <span class="op">=</span> <span class="fu"><a href="fluidPage.html">fluidPage</a></span><span class="op">(</span></span></span>
<span class="r-in"><span> <span class="fu"><a href="actionButton.html">actionButton</a></span><span class="op">(</span><span class="st">"show"</span>, <span class="st">"Show"</span><span class="op">)</span>,</span></span>
<span class="r-in"><span> <span class="fu"><a href="actionButton.html">actionButton</a></span><span class="op">(</span><span class="st">"remove"</span>, <span class="st">"Remove"</span><span class="op">)</span></span></span>
<span class="r-in"><span> <span class="op">)</span>,</span></span>
<span class="r-in"><span> server <span class="op">=</span> <span class="kw">function</span><span class="op">(</span><span class="va">input</span>, <span class="va">output</span><span class="op">)</span> <span class="op">{</span></span></span>
<span class="r-in"><span> <span class="co"># A queue of notification IDs</span></span></span>
<span class="r-in"><span> <span class="va">ids</span> <span class="op">&lt;-</span> <span class="fu"><a href="https://rdrr.io/r/base/character.html" class="external-link">character</a></span><span class="op">(</span><span class="fl">0</span><span class="op">)</span></span></span>
<span class="r-in"><span> <span class="co"># A counter</span></span></span>
<span class="r-in"><span> <span class="va">n</span> <span class="op">&lt;-</span> <span class="fl">0</span></span></span>
<span class="r-in"><span></span></span>
<span class="r-in"><span> <span class="fu"><a href="observeEvent.html">observeEvent</a></span><span class="op">(</span><span class="va">input</span><span class="op">$</span><span class="va">show</span>, <span class="op">{</span></span></span>
<span class="r-in"><span> <span class="co"># Save the ID for removal later</span></span></span>
<span class="r-in"><span> <span class="va">id</span> <span class="op">&lt;-</span> <span class="fu">showNotification</span><span class="op">(</span><span class="fu"><a href="https://rdrr.io/r/base/paste.html" class="external-link">paste</a></span><span class="op">(</span><span class="st">"Message"</span>, <span class="va">n</span><span class="op">)</span>, duration <span class="op">=</span> <span class="cn">NULL</span><span class="op">)</span></span></span>
<span class="r-in"><span> <span class="va">ids</span> <span class="op">&lt;&lt;-</span> <span class="fu"><a href="https://rdrr.io/r/base/c.html" class="external-link">c</a></span><span class="op">(</span><span class="va">ids</span>, <span class="va">id</span><span class="op">)</span></span></span>
<span class="r-in"><span> <span class="va">n</span> <span class="op">&lt;&lt;-</span> <span class="va">n</span> <span class="op">+</span> <span class="fl">1</span></span></span>
<span class="r-in"><span> <span class="op">}</span><span class="op">)</span></span></span>
<span class="r-in"><span></span></span>
<span class="r-in"><span> <span class="fu"><a href="observeEvent.html">observeEvent</a></span><span class="op">(</span><span class="va">input</span><span class="op">$</span><span class="va">remove</span>, <span class="op">{</span></span></span>
<span class="r-in"><span> <span class="kw">if</span> <span class="op">(</span><span class="fu"><a href="https://rdrr.io/r/base/length.html" class="external-link">length</a></span><span class="op">(</span><span class="va">ids</span><span class="op">)</span> <span class="op">&gt;</span> <span class="fl">0</span><span class="op">)</span></span></span>
<span class="r-in"><span> <span class="fu">removeNotification</span><span class="op">(</span><span class="va">ids</span><span class="op">[</span><span class="fl">1</span><span class="op">]</span><span class="op">)</span></span></span>
<span class="r-in"><span> <span class="va">ids</span> <span class="op">&lt;&lt;-</span> <span class="va">ids</span><span class="op">[</span><span class="op">-</span><span class="fl">1</span><span class="op">]</span></span></span>
<span class="r-in"><span> <span class="op">}</span><span class="op">)</span></span></span>
<span class="r-in"><span> <span class="op">}</span></span></span>
<span class="r-in"><span><span class="op">)</span></span></span>
<span class="r-in"><span><span class="op">}</span></span></span>
</code></pre></div>
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