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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>Get the query string / hash component from the URL — getQueryString • 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="Get the query string / hash component from the URL — getQueryString"><meta property="og:description" content="Two user friendly wrappers for getting the query string and the hash
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<h1>Get the query string / hash component from the URL</h1>
<small class="dont-index">Source: <a href="https://github.com/rstudio/shiny/blob/rc-v1.12.0/R/history.R" class="external-link"><code>R/history.R</code></a></small>
<div class="hidden name"><code>getQueryString.Rd</code></div>
</div>
<div class="ref-description">
<p>Two user friendly wrappers for getting the query string and the hash
component from the app's URL.</p>
</div>
<div id="ref-usage">
<div class="sourceCode"><pre class="sourceCode r"><code><span><span class="fu">getQueryString</span><span class="op">(</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>
<span></span>
<span><span class="fu">getUrlHash</span><span class="op">(</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-session">session<a class="anchor" aria-label="anchor" href="#arg-session"></a></dt>
<dd><p>A Shiny session object.</p></dd>
</dl></div>
<div id="value">
<h2>Value</h2>
<p>For <code>getQueryString</code>, a named list. For example, the query
string <code>?param1=value1&amp;param2=value2</code> becomes <code>list(param1 = value1, param2 = value2)</code>. For <code>getUrlHash</code>, a character vector with
the hash (including the leading <code>#</code> symbol).</p>
</div>
<div id="details">
<h2>Details</h2>
<p>These can be particularly useful if you want to display different content
depending on the values in the query string / hash (e.g. instead of basing
the conditional on an input or a calculated reactive, you can base it on the
query string). However, note that, if you're changing the query string / hash
programmatically from within the server code, you must use
<code>updateQueryString(_yourNewQueryString_, mode = "push")</code>. The default
<code>mode</code> for <code>updateQueryString</code> is <code>"replace"</code>, which doesn't
raise any events, so any observers or reactives that depend on it will
<em>not</em> get triggered. However, if you're changing the query string / hash
directly by typing directly in the browser and hitting enter, you don't have
to worry about this.</p>
</div>
<div id="see-also">
<h2>See also</h2>
<div class="dont-index"><p><code><a href="updateQueryString.html">updateQueryString()</a></code></p></div>
</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 this example 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></span>
<span class="r-in"><span> <span class="co">## App 1: getQueryString</span></span></span>
<span class="r-in"><span> <span class="co">## Printing the value of the query string</span></span></span>
<span class="r-in"><span> <span class="co">## (Use the back and forward buttons to see how the browser</span></span></span>
<span class="r-in"><span> <span class="co">## keeps a record of each state)</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="textInput.html">textInput</a></span><span class="op">(</span><span class="st">"txt"</span>, <span class="st">"Enter new query string"</span><span class="op">)</span>,</span></span>
<span class="r-in"><span> <span class="fu"><a href="helpText.html">helpText</a></span><span class="op">(</span><span class="st">"Format: ?param1=val1&amp;param2=val2"</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">"go"</span>, <span class="st">"Update"</span><span class="op">)</span>,</span></span>
<span class="r-in"><span> <span class="fu"><a href="https://rstudio.github.io/htmltools/reference/builder.html" class="external-link">hr</a></span><span class="op">(</span><span class="op">)</span>,</span></span>
<span class="r-in"><span> <span class="fu"><a href="textOutput.html">verbatimTextOutput</a></span><span class="op">(</span><span class="st">"query"</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="va">session</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">$</span><span class="va">go</span>, <span class="op">{</span></span></span>
<span class="r-in"><span> <span class="fu"><a href="updateQueryString.html">updateQueryString</a></span><span class="op">(</span><span class="va">input</span><span class="op">$</span><span class="va">txt</span>, mode <span class="op">=</span> <span class="st">"push"</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="va">output</span><span class="op">$</span><span class="va">query</span> <span class="op">&lt;-</span> <span class="fu"><a href="renderPrint.html">renderText</a></span><span class="op">(</span><span class="op">{</span></span></span>
<span class="r-in"><span> <span class="va">query</span> <span class="op">&lt;-</span> <span class="fu">getQueryString</span><span class="op">(</span><span class="op">)</span></span></span>
<span class="r-in"><span> <span class="va">queryText</span> <span class="op">&lt;-</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="fu"><a href="https://rdrr.io/r/base/names.html" class="external-link">names</a></span><span class="op">(</span><span class="va">query</span><span class="op">)</span>, <span class="va">query</span>,</span></span>
<span class="r-in"><span> sep <span class="op">=</span> <span class="st">"="</span>, collapse<span class="op">=</span><span class="st">", "</span><span class="op">)</span></span></span>
<span class="r-in"><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">"Your query string is:\n"</span>, <span class="va">queryText</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 2: getUrlHash</span></span></span>
<span class="r-in"><span> <span class="co">## Printing the value of the URL hash</span></span></span>
<span class="r-in"><span> <span class="co">## (Use the back and forward buttons to see how the browser</span></span></span>
<span class="r-in"><span> <span class="co">## keeps a record of each state)</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="textInput.html">textInput</a></span><span class="op">(</span><span class="st">"txt"</span>, <span class="st">"Enter new hash"</span><span class="op">)</span>,</span></span>
<span class="r-in"><span> <span class="fu"><a href="helpText.html">helpText</a></span><span class="op">(</span><span class="st">"Format: #hash"</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">"go"</span>, <span class="st">"Update"</span><span class="op">)</span>,</span></span>
<span class="r-in"><span> <span class="fu"><a href="https://rstudio.github.io/htmltools/reference/builder.html" class="external-link">hr</a></span><span class="op">(</span><span class="op">)</span>,</span></span>
<span class="r-in"><span> <span class="fu"><a href="textOutput.html">verbatimTextOutput</a></span><span class="op">(</span><span class="st">"hash"</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="va">session</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">go</span>, <span class="op">{</span></span></span>
<span class="r-in"><span> <span class="fu"><a href="updateQueryString.html">updateQueryString</a></span><span class="op">(</span><span class="va">input</span><span class="op">$</span><span class="va">txt</span>, mode <span class="op">=</span> <span class="st">"push"</span><span class="op">)</span></span></span>
<span class="r-in"><span> <span class="op">}</span><span class="op">)</span></span></span>
<span class="r-in"><span> <span class="va">output</span><span class="op">$</span><span class="va">hash</span> <span class="op">&lt;-</span> <span class="fu"><a href="renderPrint.html">renderText</a></span><span class="op">(</span><span class="op">{</span></span></span>
<span class="r-in"><span> <span class="va">hash</span> <span class="op">&lt;-</span> <span class="fu">getUrlHash</span><span class="op">(</span><span class="op">)</span></span></span>
<span class="r-in"><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">"Your hash is:\n"</span>, <span class="va">hash</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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