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    <p>Although I don't think there is anything natively available in <code>shiny</code>, you can try adding <code>jQueryUI</code> to your application and using the Dialog widget. See <a href="http://jqueryui.com/dialog/" rel="noreferrer">http://jqueryui.com/dialog/</a>.</p> <p>(Un?)fortunately, you'll be forced to write some JavaScript to make it work.</p> <hr> <p>Per @GSee's suggestion, here's a very minimal example of what it takes to make it work.</p> <p>You'll need to download <a href="http://jqueryui.com/" rel="noreferrer">jQueryUI</a> and set up a shiny project with a structure like so:</p> <pre><code>. ├── server.R ├── ui.R └── www ├── css │ └── jquery-ui.css ├── images │ ├── animated-overlay.gif │ ├── ui-bg_flat_0_aaaaaa_40x100.png │ ├── ui-bg_flat_75_ffffff_40x100.png │ ├── ui-bg_glass_55_fbf9ee_1x400.png │ ├── ui-bg_glass_65_ffffff_1x400.png │ ├── ui-bg_glass_75_dadada_1x400.png │ ├── ui-bg_glass_75_e6e6e6_1x400.png │ ├── ui-bg_glass_95_fef1ec_1x400.png │ ├── ui-bg_highlight-soft_75_cccccc_1x100.png │ ├── ui-icons_222222_256x240.png │ ├── ui-icons_2e83ff_256x240.png │ ├── ui-icons_454545_256x240.png │ ├── ui-icons_888888_256x240.png │ └── ui-icons_cd0a0a_256x240.png └── js └── jquery-ui.js </code></pre> <p>(all of the image icons come part of jQueryUI)</p> <p>Next, add a file called <code>scripts.js</code> (or whatever you like) to the <code>www/js</code> folder, containing the following</p> <pre><code>$( function() { $("#dialog").dialog(); }) </code></pre> <p>This calls the <code>jQueryUI</code> <code>dialog</code> initializer on the element with id <code>dialog</code>.</p> <p>Next, have a <code>server.R</code> and <code>ui.R</code> as follows:</p> <pre><code>server.R -------- library(shiny) shinyServer( function(input, output, session) { ## a very unsafe, basic access to the R console output$dialog &lt;- renderPrint({ code &lt;- input$console output &lt;- eval( parse( text=code ) ) return(output) }) }) </code></pre> <p>and</p> <pre><code>ui.R ---- library(shiny) shinyUI(bootstrapPage( includeCSS("www/css/jquery-ui.css"), includeScript("www/js/jquery-ui.js"), includeScript("www/js/scripts.js"), textInput("console", "Enter an R Command"), uiOutput("dialog") )) </code></pre> <p>Now, if you do <code>runApp()</code>, you should see the results of evaluation of any code you write into the text input <code>console</code> appearing in the <code>dialog</code> box.</p> <p>Now, the question is, how can we minimize it, or only show it when, say, error code is produced? That I'll have to leave for you, because I think it'll be tricky. Some options:</p> <ol> <li><p>Figure out how to get our R code to send, or trigger, some JavaScript to show or hide the element. An example (not mine) using this to temporarily disable a button is <a href="https://gist.github.com/xiaodaigh/6810928" rel="noreferrer">here</a>.</p></li> <li><p>Attach a (JavaScript) observer or trigger to the output produced, and if you see an error (or output otherwise conforming in some way), show the box; otherwise hide it.</p></li> <li><p>Generate an actual Shiny input/output pair to handle behavior as desired. (Brief tutorial at <a href="http://rstudio.github.io/shiny/tutorial/#building-inputs" rel="noreferrer">http://rstudio.github.io/shiny/tutorial/#building-inputs</a>)</p></li> </ol> <p>If you want to get a bit more out of your jQueryUI dialog, you can also try the extension jQuery-dialogextend <a href="https://github.com/ROMB/jquery-dialogextend" rel="noreferrer">here</a>.</p> <p>And, disclaimer: the console here is only for demonstrative purposes; please don't put any shiny apps that run unsanitized code from the user into the wild!</p>
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    1. COThis would be an excellent answer if you showed an example shiny app that uses a Dialog widget
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    2. COexcellent answer! :) Thanks
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