dynatrace-cordova-outsystems-plugin/node_modules/nwsapi/src/modules/nwsapi-traversal.js

This plugin gives you the ability to use the Dynatrace instrumentation in your hybrid application (Cordova, Ionic, ..). It uses the Mobile Agent, the JavaScript Agent and the Javascript Bridge. The Mobile Agent will give you all device specific values con

/*
 * 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';

  function walkElements(property, element, expr) {
    var i = 0, isIndex = typeof expr == 'number';
    if (typeof expr == 'undefined') {
      isIndex = true;
      expr = 0;
    }
    while ((element = element[property])) {
      if (element.nodeType != 1) continue;
      if (isIndex) {
        ++i;
        if (i == expr) return element;
      } else if (match(element, expr)) {
        return element;
      }
    }
    return null;
  }

  /**
   * @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);