title: renderImage NOT DISPLAYING - R Shiny (only alt text)
body: <p>Using the code below, I am only getting the alt text to appear.
  Any suggestions on what may be the problem?</p>
  
  <p>From server.R:</p>
  
  <pre><code>output$face &lt;- renderImage({
  list(src = "http://www.clipartbest.com/cliparts/yco/GGE/ycoGGEacE.png",
  filetype = "image/png",
  alt = "YOU MUST BE KIDDING ME!")
  }, deleteFile = FALSE)
  </code></pre>
  
  <p>From ui.R:</p>
  
  <pre><code>imageOutput("face")
  </code></pre>
  
  <p>Thanks,</p>
  
  <p>Chad</p>
  
  <p>Adding to the explanation of the problem - I am not just trying to display the image. Rather, I am trying to make it reactive - and display a different image, based on inputs... per the server.R code below:</p>
  
  <pre><code>output$imagegauge &lt;- renderImage({
  if (is.null(IRR_calc()))
  return(NULL)
  
  if (IRR_calc() &gt; .085) {
  return(list(
  src = "http://www.i2symbol.com/images/abc-123/o/white_smiling_face_u263A_icon_256x256.png",
  contentType = "image/png",
  alt = "Smiley Face"
  ))
  } else  {
  return(list(
  src = "http://www.clipartbest.com/cliparts/yco/GGE/ycoGGEacE.png",
  filetype = "image/png",
  alt = "Sad Face"
  ))
  }
  }, deleteFile = FALSE)
  </code></pre>
  
  <p>Thanks again,</p>
  
  <p>Chad</p>