Nota: Después de guardar, debes refrescar la caché de tu navegador para ver los cambios. Internet Explorer: mantén presionada Ctrl mientras pulsas Actualizar. Firefox: mientras presionas Mayús pulsas el botón Actualizar, (o presiona Ctrl-Shift-R). Los usuarios de Google Chrome y Safari pueden simplemente pulsar el botón Recargar. Para más detalles e instrucciones acerca de otros exploradores, véase Ayuda:Cómo limpiar la caché.

//<pre><nowiki>

// under heavy development: do NOT use!

function cbRequest(url) {
  var r = false;

  if (window.XMLHttpRequest && !window.ActiveXObject)
      r = new XMLHttpRequest(); // native mode
  else if (window.ActiveXObject)
    try {
      r = new ActiveXObject('Msxml2.XMLHTTP');
    } catch (e) {
      r = new ActiveXObject('Microsoft.XMLHTTP');
    }
  if (r && url) {
    r.open('GET', url, false);
    r.send(null);
  }
  return r;
}

function cbCatLinkHTML(cat, full) {
 //TODO: escape bad characters from cat
  return '<SPAN CLASS="CategoryTreeBullet">[<A HREF="javascript:cbOpen(\'' + cat + '\');" TITLE="Navegar por la ' + cat + '">+</A>]&nbsp;</SPAN>' + (full ? '<A HREF="/wiki/' + encodeURIComponent(cat) + '">' + cat + '</A>' : '');
}

function cbAddLinks() {
  if (!cbRequest())
    return;
  var catlinksdiv = document.getElementById('mw-normal-catlinks');
  if (catlinksdiv) {
    var i = catlinksdiv.firstChild;
    while (i) { //TODO: reorder categories
      if (i.nodeName == 'SPAN')
        i.innerHTML = cbCatLinkHTML(i.firstChild.title.replace(/[^:]+:/, ''), false) + i.innerHTML;
      i = i.nextSibling;
    }
  }
}

function cbCMBlock(cat, subcats, cmc) {
  var url = '/w/api.php?action=query&list=categorymembers&format=json&cmprop=ids|title|sortkey&cmlimit=180&cmnamespace=' + (subcats ? '14' : '0|1|2|3|4|5|6|7|8|9|10|11|12|13|15|100|101|102|103|104|105') + (cmc ? '&cmcontinue=' + encodeURIComponent(cmc) : '') + '&cmtitle=Category:' + encodeURIComponent(cat);
  var r = cbRequest(url);
  if (r)
    return eval('(' + r.responseText + ')');
  return null;
}

function cbOpen(cat) {
  // TODO: Change "button" to avoid reopens
  var box = document.getElementById('cb-box');
  if (!box) {
    box = document.createElement('DIV');
    box.id = 'cb-box';
    box.style.border = 'solid 1px #a0a0a0';
    box.style.padding = '5px';
    box.style.marginTop = '5px';
    box.style.fontSize = '90%';
    var catlinks = document.getElementById('catlinks')
    catlinks.parentNode.insertBefore(box, catlinks.nextSibling);
  }
  // TODO: Better format
  box.innerHTML = '<H3><SPAN><IMG SRC="http://up.wiki.x.io/wikipedia/commons/d/d2/Spinning_wheel_throbber.gif" />&nbsp;Cargando&nbsp;</SPAN>' + cat + '</H3>';
  var r = cbRequest('/w/api.php?action=parse&prop=text|categories&format=json&text=' + encodeURIComponent('{{Category:' + cat + '}}'));
  if (r) {  
    var catr = eval('(' + r.responseText + ')');
    var pcats = catr['parse']['categories'];
    var h = '';
    for (var i = 0; i < pcats.length; i++)
      h = h + (h.length > 0 ? ' \u2022 ' : '&nbsp;\u25b2&nbsp;') + cbCatLinkHTML(pcats[i]['*'].replace(/_/g, ' '), true);
    if (h) {
      var div = document.createElement('DIV');
      div.innerHTML = h;
      box.appendChild(div);
    }
    var s = catr['parse']['text']['*'];
    if (s.length > 0) { // TODO: remove when only contains comments?
      var div = document.createElement('DIV');
      div.style.borderTop = 'solid 1px #a0a0a0';
      div.style.marginTop = '5px';
      div.style.marginBottom = '5px';
      div.innerHTML = s + '<BR CLEAR="ALL">';
      box.appendChild(div);
    }
  }
  var block = cbCMBlock(cat, true, '');
  var catm = block['query']['categorymembers'];
  if (catm.length > 0) { // TODO: better format, split in blocks
    var s = 'Subcategorías:<BR /><UL>';
    for (var i = 0; i < catm.length; i++)
      s = s + '<LI>' + cbCatLinkHTML(catm[i]['title'].replace(/[^:]+:/, ''), true) + '</LI>';
    s = s + '</UL>';
    var div = document.createElement('DIV');
    div.style.borderTop = 'solid 1px #a0a0a0';
    div.innerHTML = s;
    box.appendChild(div);
  }
  var block = cbCMBlock(cat, false, '');
  var catm = block['query']['categorymembers'];
  if (catm.length > 0) {
    var div = null;
    var sl = '';
    var cc = Math.ceil(catm.length / 3);
    while (true) {
      var s = '<TD WIDTH="33%"><UL>';
      for (var i = 0; i < catm.length; i++) {
        var j = catm[i];
        var br = ((i % cc) == 0 && i > 0);
        if (br) {
          s = s + '</UL></TD><TD WIDTH="33%"><UL>';
          sl = '';
        }
        var jl = j['sortkey'].charAt(0);
        if (sl != jl) {
          sl = jl;
          s = s + '</UL><STRONG>' + sl + '</STRONG>' + (br ? ' (cont.)' : '') + '<UL>';
        }
        s = s + '<LI><A HREF="/wiki/' + encodeURIComponent(j['title']) + '">' + j['title'] + '</A></LI>';
      }
      s = s + '</UL></TD>';
      if (div)
        div.innerHTML = div.innerHTML.replace(/<\/TR>/i, s + '</TR>');
      else {
        div = document.createElement('DIV');
        div.style.borderTop = 'solid 1px #a0a0a0';
        box.appendChild(div);
        div.innerHTML = '<TABLE><TR VALIGN="top">' + s + '</TR></TABLE>';
      }
      if (block['query-continue']) {
        block = cbCMBlock(cat, false, block['query-continue']['categorymembers']['cmcontinue']);
        catm = block['query']['categorymembers'];
      } else
        break;
    }
  }
  box.firstChild.removeChild(box.firstChild.firstChild);
}

// addOnloadHook(cbAddLinks);

//</nowiki></pre>