Javascript: displaying images with onchange event Post: 302925505

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Top Forums Programming Javascript: displaying images with onchange event Post 302925505 by figaro on Monday 17th of November 2014 02:18:51 PM

11-17-2014

Registered User

Javascript: displaying images with onchange event

I am looking to display the pdf of one of two distributions, depending on what the user selected:

Code:

<script type="text/javascript">
function distributionChange() {
  var img = document.createElement("img");
  var link = 'http://en.wikipedia.org/wiki/xxx#mediaviewer/File:yyy';

  switch (document.getElementById("distributions").value) {
    case 'normal':
      img.src = link.replace("xxx", "Normal_distribution").replace("yyy", "Normal_Distribution_PDF.svg");
      break;
    case 'lognormal':
      img.src = link.replace("xxx", "Log-normal_distribution").replace("yyy", "Some_log-normal_distributions.svg");
      break;
    default:
      img.src = "Distribution not specified.";
  }

  img.setAttribute("width", "320");
  document.getElementById("distribution").appendChild(img);
}
</script>

<select id='distributions' onChange='distributionChange()'>
<option name='option0' value='normal'>normal</option>
<option name='option1' value='lognormal'>lognormal</option>
</select>

<div id="distribution"></div>

Two questions on this:
1- Why are the images appended and not recreated? Rather than overwriting the previous image, the new image is shown next to the old one.
2- Why is the image not actually shown? When doing Ctrl-Shift-J in my browser, the link to the image is correct.

figaro

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img-bmp

img-bmp(3tk)															      img-bmp(3tk)

NAME

       img-bmp - Img, Windows Bitmap Format (bmp)

SYNOPSIS

       package require Tk

       package require img::bmp  ?1.3?

       image create photo ?name? ?options?

DESCRIPTION

       The  package  img::bmp  is a sub-package of Img. It can be loaded as a part of the complete Img support, via package require Img, or on its
       own, via package require img::bmp.

       Like all packages of Img it does not provide new commands, but extends the existing Tk command image so that it supports  files	containing
       raster images in the Windows Bitmap Format (bmp). More specifically img::bmp extends Tk's photo image type.

       The name of the new format handler is bmp.  This handler does not provide additional configuration options.

       All of the above means that in a call like

       image create photo ?name? ?options?

       [1]    Image data in bmp format (options -data and -file) is detected automatically.

       [2]    The format name bmp is recognized by the option -format.

SEE ALSO

       img-bmp,  img-gif,  img-ico,  img-intro, img-jpeg, img-pcx, img-pixmap, img-png, img-ppm, img-ps, img-sgi, img-sun, img-tga, img-tiff, img-
       window, img-xbm, img-xpm

KEYWORDS

       bmp, image handling, tk

COPYRIGHT

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Img									1.3							      img-bmp(3tk)