I have managed to easily integrate WYMeditor into Django's administrative interface.

Here is how I did it...

First I copied the wymeditor to my project's static-served files directory, which in my case had an URL prefix of /site/media/

There I put the wymeditor, jquery and a special file admin_textarea.js, that I have written myself consisting of:

$(document).ready(function() {
    $('head', document).append('<link rel="stylesheet" type="text/css" media="screen" href="/site/media/wymeditor/skins/default/screen.css" />');
    $("textarea").wymeditor({
        updateSelector: "input:submit",
        updateEvent:    "click"    
    });
});

This file instructs the browser to load an additional WYMeditor's CSS and to convert each <textarea> HTML tag into a WYMeditor.

In each of the Django models that I whished to set WYMeditor for, I have added the following js setting to the Admin section:

class ExampleModel(models.Model):
    text = models.TextField()     # each TextField will have WYM editing enabled
    class Admin:
         js = ('/site/media/jquery.js',
               '/site/media/wymeditor/jquery.wymeditor.js',
               '/site/media/admin_textarea.js')

That is it. If you wish to use WYM in your own Django app, just follow the steps and replace the /site/media/... with whatever your static media prefix is.

Using the filebrowser application

To integrate Wymeditor with the  Django filebrowser, put the code below in a file, set the fb_url variable to point to your filebrowser instance and add the file to your Javascript headers:

  <script type="text/javascript" src="/media/wymeditor/plugins/jquery.wymeditor.filebrowser.js"></script>

or in your admin.py:

   class Media:
       js = ('/media/wymeditor/plugins/jquery.wymeditor.filebrowser.js',)

Add the postInitDialog parameter to the Wymeditor initialization:

  $('textarea').wymeditor({
    postInitDialog: wymeditor_filebrowser
  });

If you already have a postInitDialog function, you need to put a call to wymeditor_filebrowser inside that function:

  $('textarea').wymeditor({
    postInitDialog: function (wym, wdw) {
        // Your code here...
        
        // Filebrowser callback
        wymeditor_filebrowser(wym, wdw);
    }
  });

Then you should be able to click on the Filebrowser link to select an image.

Code:

wymeditor_filebrowser = function(wym, wdw) {
  // the URL to the Django filebrowser, depends on your URLconf
  var fb_url = '/admin/filebrowser/';
  
  var dlg = jQuery(wdw.document.body);
  if (dlg.hasClass('wym_dialog_image')) {
    // this is an image dialog
    dlg.find('.wym_src').css('width', '200px').attr('id', 'filebrowser')
      .after('<a id="fb_link" title="Filebrowser" href="#">Filebrowser</a>');
    dlg.find('fieldset')
      .append('<a id="link_filebrowser"><img id="image_filebrowser" /></a>' +
              '<br /><span id="help_filebrowser"></span>');
    dlg.find('#fb_link')
      .click(function() {
        fb_window = wdw.open(fb_url + '?pop=1', 'filebrowser', 'height=600,width=840,resizable=yes,scrollbars=yes');
        fb_window.focus();
        return false;
      });
  }
}