RetroZilla/dom/tests/js/tables/changeCaption.js

/* -*- Mode: js; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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function findBody(node)
{
  if (node.nodeType != Node.ELEMENT_NODE) {
    return null;
  }
  var children = node.childNodes;
  if (children == null) {
    return null;
  }
  var length = children.length;
  var child = null;
  var count = 0;
  while (count < length) {
    child = children[count];
    if (child.tagName == "BODY") {
      dump("BODY found");
      return child;
    }
    var body = findBody(child);
    if (null != body) {
      return body;
    }
    count++;
  }
  return null;
}

// Given the body element, find the first table element
function findTable(body)
{
  // XXX A better way to do this would be to use getElementsByTagName(), but
  // it isn't implemented yet...
  var children = body.childNodes
  if (children == null) {
    return null;
  }
  var length = children.length;
  var child = null;
  var count = 0;
  while (count < length) {
    child = children[count];
    if (child.nodeType == Node.ELEMENT_NODE) {
      if (child.tagName == "TABLE") {
        dump("TABLE found");
        break;
      }
    }
    count++;
  }

  return child;
}

// Change the table's caption
function changeCaption(table)
{
  // Get the first element. This is the caption (maybe). We really should
  // check...
  var caption = table.firstChild

  // Get the caption text
  var text = caption.firstChild

  // Append some text
  text.append(" NEW TEXT")
}

changeCaption(findTable(findBody(document.documentElement)))