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Edit File:nwsapi-traversal.js

/*
 * Element Traversal methods from Juriy Zaytsev (kangax)
 * used to emulate Prototype up/down/previous/next methods
 */

(function(D){

// TODO: all of this needs tests
  var match = D.match, select = D.select, root = document.documentElement,

// Use the Element Traversal API if available.
  nextElement = 'nextElementSibling',
  previousElement = 'previousElementSibling',
  parentElement = 'parentElement';

// Fall back to the DOM Level 1 API.
  if (!(nextElement in root)) nextElement = 'nextSibling';
  if (!(previousElement in root)) previousElement = 'previousSibling';
  if (!(parentElement in root)) parentElement = 'parentNode';

/**
   * @method up
   * @param {HTMLElement} element element to walk from
   * @param {String | Number} expr CSS expression or an index
   * @return {HTMLElement | null}
   */
  function up(element, expr) {
    return walkElements(parentElement, element, expr);
  }
  /**
   * @method next
   * @param {HTMLElement} element element to walk from
   * @param {String | Number} expr CSS expression or an index
   * @return {HTMLElement | null}
   */
  function next(element, expr) {
    return walkElements(nextElement, element, expr);
  }
  /**
   * @method previous
   * @param {HTMLElement} element element to walk from
   * @param {String | Number} expr CSS expression or an index
   * @return {HTMLElement | null}
   */
  function previous(element, expr) {
    return walkElements(previousElement, element, expr);
  }
  /**
   * @method down
   * @param {HTMLElement} element element to walk from
   * @param {String | Number} expr CSS expression or an index
   * @return {HTMLElement | null}
   */
  function down(element, expr) {
    var isIndex = typeof expr == 'number', descendants, index, descendant;
    if (expr === null) {
      element = element.firstChild;
      while (element && element.nodeType != 1) element = element[nextElement];
      return element;
    }
    if (!isIndex && match(element, expr) || isIndex && expr === 0) return element;
    descendants = select('*', element);
    if (isIndex) return descendants[expr] || null;
    index = 0;
    while ((descendant = descendants[index]) && !match(descendant, expr)) { ++index; }
    return descendant || null;
  }
  D.up = up;
  D.down = down;
  D.next = next;
  D.previous = previous;
})(NW.Dom);

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Edit File:nwsapi-traversal.js