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(This article was first published on <strong><a href="http://www.r-exercises.com/2017/05/09/shiny-applications-layouts-exercises-part-6/?utm_source=rss&utm_medium=rss&utm_campaign=shiny-applications-layouts-exercises-part-6"> R-exercises</a></strong>, and kindly contributed to <a rel="nofollow" href="https://www.r-bloggers.com/">R-bloggers)</a> </div>
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<p><strong>Shiny Applications Layouts – Absolutely-positioned panel</strong></p>
<p>In the sixth part of our journey through Shiny App Layouts we will meet the absolutely-positioned panels. These are panels that you can drag and drop or not wherever you want in the interface. Moreover you can put anything in them, including inputs and outputs.</p>
<p>This part can be useful for you in two ways. </p>
<p>First of all, you can see different ways to enhance the appearance and the utility of your shiny app. </p>
<p>Secondly you can make a revision on what you learnt in <a target="_blank" rel="nofollow" href="http://www.r-exercises.com/2016/12/12/building-shiny-app-exercises-part-1/">“Building Shiny App”</a> series as we will build basic shiny staff in order to present it in the proper way.</p>
<p>Read the examples below to understand the logic of what we are going to do and then test yous skills with the exercise set we prepared for you. Lets begin!</p>
<p>Answers to the exercises are available <a target="_blank" rel="nofollow" href="http://r-exercises.com/2017/05/09/shiny-application-layouts-solutions-part-6/">here</a>.</p>
<p><strong>Install Packages</strong></p>
<p>For this app we will need the package <code>markdown</code>.</p>
<p><strong>Exercise 1</strong></p>
<p>Install and call the markdown package.</p>
<p><strong>Build App</strong></p>
<p><strong>Exercise 2</strong></p>
<p>Create a fluidpage with title “ABSOLUTE PANEL”. <strong>HINT</strong>: Use <code>fluidpage()</code>.</p>
<p>In order to create this type of Panel you have to use the<code> absolutePanel()</code> function like the example below:<br>
#ui.R<br>
<code>fluidPage(<br>
  h1(&quot;Absolutely&quot;),<br>
  absolutePanel())</code></p>
<p><strong>Exercise 3</strong></p>
<p>Apply <code>absolutePanel()</code> function to your UI.</p>
<p><strong>Exercise 4</strong></p>
<p>Add a well Panel inside the <code>absolutePanel()</code>. <strong>HINT</strong>: Use <code>wellPanel()</code>.</p>
<p>With the help of the <code>markdown</code> package we will add some random text like the example below:<br>
#ui.R<br>
<code>HTML(markdownToHTML(fragment.only=TRUE, text=c(<br>
        &quot;bla bla bla bla bla bla<br>
         bal blabla balalallalal<br>
         bla bla bla bla bla bla&quot;<br>
      )))</code></p>
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<div><strong>Learn more</strong> about Shiny in the online course <a target="_blank" rel="nofollow" href="http://www.r-exercises.com/product/r-shiny-interactive-web-apps/">R Shiny Interactive Web Apps – Next Level Data Visualization</a>. In this course you will learn how to create advanced Shiny web apps; embed video, pdfs and images; add focus and zooming tools; and many other functionalities (30 lectures, 3hrs.).</div>
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<p><strong>Exercise 5</strong></p>
<p>Write a random text message using <code>markdown</code> and place it in your well Panel.</p>
<p>We will build an absolute Panel that uses <code>bottom</code> and <code>right</code> attributes. We also set <code>draggable = TRUE</code>, in order to move it.<br>
#ui.R<br>
<code>absolutePanel(<br>
    bottom = 50, right = 50, width = 200,<br>
    draggable = TRUE)</code></p>
<p><strong>Exercise 6</strong></p>
<p>Practice with different values for <code>bottom</code>,<code>left</code>,<code>right</code> and <code>width</code> attributes and also set <code>draggable</code> to TRUE.</p>
<p>As already mentioned you can put anything you want in an abloslute Panel.For example:<br>
#ui.R<br>
<code>absolutePanel(<br>
sliderInput(&quot;s&quot;, &quot;&quot;, min=3, max=20, value=5),<br>
      plotOutput(&quot;plot&quot;, height=&quot;100px&quot;))<br>
#server.R<br>
function(input, output, session) {<br>
  output$plot &lt;- renderPlot({<br>
    plot(head(cars, input$s), main=&quot;Cars&quot;)<br>
  })<br>
}</code></p>
<p><strong>Exercise 7</strong></p>
<p>Put a slider in your absolute Panel. <strong>HINT</strong>: Use <code>sliderInput()</code>.</p>
<p><strong>Exercise 8</strong></p>
<p>Then put a scatter plot like the one in the example above and connect it with your slider. <strong>HINT</strong>: Use <code>plotOutput()</code>.</p>
<p><strong>Fixed Panel</strong></p>
<p>You can place your <code>absolutePanel() </code>function at the top of the screen using <code>top</code>, <code>left</code>, and <code>right</code> attributes.</p>
<p>Furthermore with <code>fixed=TRUE</code>, you can stabilize it.<br>
#ui.R<br>
<code>absolutePanel(<br>
    top = 0, left = 0, right = 0,<br>
    fixed = TRUE)</code></p>
<p><strong>Exercise 9</strong></p>
<p>Place your absolute Panel to the top. Play with the parameters to understand how they affect its position.</p>
<p><strong>Exercise 10</strong></p>
<p>Stabilize your absolute Panel with <code>fixed</code>.</p>
<div>
<h3>Related exercise sets:</h3>
<ol>
<li><a title="Building Shiny App exercises part 4" target="_blank" rel="nofollow" href="http://www.r-exercises.com/2017/01/01/building-shiny-app-exercises-part-4/">Building Shiny App exercises part 4 </a></li>
<li><a title="Building Shiny App exercises part 1" target="_blank" rel="nofollow" href="http://www.r-exercises.com/2016/12/12/building-shiny-app-exercises-part-1/">Building Shiny App exercises part 1 </a></li>
<li><a title="Shiny Application Layouts exercises part 3" target="_blank" rel="nofollow" href="http://www.r-exercises.com/2017/04/30/shiny-application-layouts-exercises-part-3/">Shiny Application Layouts exercises part 3 </a></li>
<li><a target="_blank" rel="nofollow" href="http://www.r-exercises.com/start-here-to-learn-r/">Explore all our (>1000) R exercises</a></li>
<li><a target="_blank" rel="nofollow" href="http://www.r-exercises.com/r-courses/">Find an R course using our R Course Finder</a> directory</li>
</ol>
</div>
<p>
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