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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LEARN ABOUT OSX

img

img-intro(n)															      img-intro(n)

__________________________________________________________________________________________________________________________________________________

NAME

       img-intro - Introduction to Img

SYNOPSIS

       package require Tk

       package require Img  ?1.4?

_________________________________________________________________

DESCRIPTION

       Img is a Tk extension, adding support for many other Image formats, as listed below. The individual formats are described in more detail on
       their own pages.

       bmp    Windows bitmap format.  See img-bmp.

       dted   DTED terrain elevation data interpreted as image.  See img-dted.

       gif    The venerable graphics interchange format (with transparency, but without LZW. The latter due to patent issues).	See img-gif.

       ico    Windows icon files.  See img-ico.

       jpeg   The format for lossy compressed still pictures specified by the Joint Picture Experts Group.  See img-jpeg.

       pcx    Paintbrush image format.	See img-pcx.

       pixmap While the other formats are handlers for the Tk photo image type this is a new image type for Tk.  See img-pixmap.

       png    Portable Network Graphics, successor to GIF.  See img-png.

       ppm    Portable Pixmaps.  See img-ppm.

       ps     Postscript and PDF (Portable document format). Requires an external application, ghostview, for its operation.  See img-ps.

       raw    Raw matrix data interpreted as image.  See img-raw.

       sgi    Native SGI format.  See img-sgi.

       sun    Sun raster images.  See img-sun.

       tga    Targa files.  See img-tga.

       tiff   Tagged Interchange File Format.  See img-tiff.

       window Put the content of a Tk window into an image.  See img-window.

       xbm    X Bitmaps.  See img-xbm.

       xpm    X Pixmaps.  See img-xpm.

       This version only works with Tcl/Tk 8.3 or higher.  If you are using Tk 8.2, please use Img 1.3.  If you are using Tk 8.1 or  lower  please
       stick  with  Img  1.2.4	(which is still available).  And if you are using Tk4.2 or lower, please stick with Img 1.1.4 (which is also still
       available).

SEE ALSO

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

KEYWORDS

       bmp, gif, ico, image handling, jpeg, pcx, pdf, pixmap, png, postscript, ppm, ps, sgi, sun, tga, tiff, tk, window, xbm, xpm

COPYRIGHT

       Copyright (c) 1995-2009 Jan Nijtmans <nijtmans@users.sourceforge.net>

Img									1.4							      img-intro(n)