angular.js/src/jqLite.js

'use strict';

/* global

  -JQLitePrototype,
  -addEventListenerFn,
  -removeEventListenerFn,
  -BOOLEAN_ATTR
*/

//////////////////////////////////
//JQLite
//////////////////////////////////

/**
 * @ngdoc function
 * @name angular.element
 * @function
 *
 * @description
 * Wraps a raw DOM element or HTML string as a [jQuery](http://jquery.com) element.
 *
 * If jQuery is available, `angular.element` is an alias for the
 * [jQuery](http://api.jquery.com/jQuery/) function. If jQuery is not available, `angular.element`
 * delegates to Angular's built-in subset of jQuery, called "jQuery lite" or "jqLite."
 *
 * <div class="alert alert-success">jqLite is a tiny, API-compatible subset of jQuery that allows
 * Angular to manipulate the DOM in a cross-browser compatible way. **jqLite** implements only the most
 * commonly needed functionality with the goal of having a very small footprint.</div>
 *
 * To use jQuery, simply load it before `DOMContentLoaded` event fired.
 *
 * <div class="alert">**Note:** all element references in Angular are always wrapped with jQuery or
 * jqLite; they are never raw DOM references.</div>
 *
 * ## Angular's jqLite
 * jqLite provides only the following jQuery methods:
 *
 * - [`addClass()`](http://api.jquery.com/addClass/)
 * - [`after()`](http://api.jquery.com/after/)
 * - [`append()`](http://api.jquery.com/append/)
 * - [`attr()`](http://api.jquery.com/attr/)
 * - [`bind()`](http://api.jquery.com/on/) - Does not support namespaces, selectors or eventData
 * - [`children()`](http://api.jquery.com/children/) - Does not support selectors
 * - [`clone()`](http://api.jquery.com/clone/)
 * - [`contents()`](http://api.jquery.com/contents/)
 * - [`css()`](http://api.jquery.com/css/)
 * - [`data()`](http://api.jquery.com/data/)
 * - [`eq()`](http://api.jquery.com/eq/)
 * - [`find()`](http://api.jquery.com/find/) - Limited to lookups by tag name
 * - [`hasClass()`](http://api.jquery.com/hasClass/)
 * - [`html()`](http://api.jquery.com/html/)
 * - [`next()`](http://api.jquery.com/next/) - Does not support selectors
 * - [`on()`](http://api.jquery.com/on/) - Does not support namespaces, selectors or eventData
 * - [`off()`](http://api.jquery.com/off/) - Does not support namespaces or selectors
 * - [`parent()`](http://api.jquery.com/parent/) - Does not support selectors
 * - [`prepend()`](http://api.jquery.com/prepend/)
 * - [`prop()`](http://api.jquery.com/prop/)
 * - [`ready()`](http://api.jquery.com/ready/)
 * - [`remove()`](http://api.jquery.com/remove/)
 * - [`removeAttr()`](http://api.jquery.com/removeAttr/)
 * - [`removeClass()`](http://api.jquery.com/removeClass/)
 * - [`removeData()`](http://api.jquery.com/removeData/)
 * - [`replaceWith()`](http://api.jquery.com/replaceWith/)
 * - [`text()`](http://api.jquery.com/text/)
 * - [`toggleClass()`](http://api.jquery.com/toggleClass/)
 * - [`triggerHandler()`](http://api.jquery.com/triggerHandler/) - Passes a dummy event object to handlers.
 * - [`unbind()`](http://api.jquery.com/off/) - Does not support namespaces
 * - [`val()`](http://api.jquery.com/val/)
 * - [`wrap()`](http://api.jquery.com/wrap/)
 *
 * ## jQuery/jqLite Extras
 * Angular also provides the following additional methods and events to both jQuery and jqLite:
 *
 * ### Events
 * - `$destroy` - AngularJS intercepts all jqLite/jQuery's DOM destruction apis and fires this event
 *    on all DOM nodes being removed.  This can be used to clean up any 3rd party bindings to the DOM
 *    element before it is removed.
 *
 * ### Methods
 * - `controller(name)` - retrieves the controller of the current element or its parent. By default
 *   retrieves controller associated with the `ngController` directive. If `name` is provided as
 *   camelCase directive name, then the controller for this directive will be retrieved (e.g.
 *   `'ngModel'`).
 * - `injector()` - retrieves the injector of the current element or its parent.
 * - `scope()` - retrieves the {@link api/ng.$rootScope.Scope scope} of the current
 *   element or its parent.
 * - `isolateScope()` - retrieves an isolate {@link api/ng.$rootScope.Scope scope} if one is attached directly to the
 *   current element. This getter should be used only on elements that contain a directive which starts a new isolate
 *   scope. Calling `scope()` on this element always returns the original non-isolate scope.
 * - `inheritedData()` - same as `data()`, but walks up the DOM until a value is found or the top
 *   parent element is reached.
 *
 * @param {string|DOMElement} element HTML string or DOMElement to be wrapped into jQuery.
 * @returns {Object} jQuery object.
 */

var jqCache = JQLite.cache = {},
    jqName = JQLite.expando = 'ng-' + new Date().getTime(),
    jqId = 1,
    addEventListenerFn = (window.document.addEventListener
      ? function(element, type, fn) {element.addEventListener(type, fn, false);}
      : function(element, type, fn) {element.attachEvent('on' + type, fn);}),
    removeEventListenerFn = (window.document.removeEventListener
      ? function(element, type, fn) {element.removeEventListener(type, fn, false); }
      : function(element, type, fn) {element.detachEvent('on' + type, fn); });

function jqNextId() { return ++jqId; }


var SPECIAL_CHARS_REGEXP = /([\:\-\_]+(.))/g;
var MOZ_HACK_REGEXP = /^moz([A-Z])/;
var jqLiteMinErr = minErr('jqLite');

/**
 * Converts snake_case to camelCase.
 * Also there is special case for Moz prefix starting with upper case letter.
 * @param name Name to normalize
 */
function camelCase(name) {
  return name.
    replace(SPECIAL_CHARS_REGEXP, function(_, separator, letter, offset) {
      return offset ? letter.toUpperCase() : letter;
    }).
    replace(MOZ_HACK_REGEXP, 'Moz$1');
}

/////////////////////////////////////////////
// jQuery mutation patch
//
// In conjunction with bindJQuery intercepts all jQuery's DOM destruction apis and fires a
// $destroy event on all DOM nodes being removed.
//
/////////////////////////////////////////////

function jqLitePatchJQueryRemove(name, dispatchThis, filterElems, getterIfNoArguments) {
  var originalJqFn = jQuery.fn[name];
  originalJqFn = originalJqFn.$original || originalJqFn;
  removePatch.$original = originalJqFn;
  jQuery.fn[name] = removePatch;

  function removePatch(param) {
    // jshint -W040
    var list = filterElems && param ? [this.filter(param)] : [this],
        fireEvent = dispatchThis,
        set, setIndex, setLength,
        element, childIndex, childLength, children;

    if (!getterIfNoArguments || param != null) {
      while(list.length) {
        set = list.shift();
        for(setIndex = 0, setLength = set.length; setIndex < setLength; setIndex++) {
          element = jqLite(set[setIndex]);
          if (fireEvent) {
            element.triggerHandler('$destroy');
          } else {
            fireEvent = !fireEvent;
          }
          for(childIndex = 0, childLength = (children = element.children()).length;
              childIndex < childLength;
              childIndex++) {
            list.push(jQuery(children[childIndex]));
          }
        }
      }
    }
    return originalJqFn.apply(this, arguments);
  }
}

/////////////////////////////////////////////
function JQLite(element) {
  if (element instanceof JQLite) {
    return element;
  }
  if (!(this instanceof JQLite)) {
    if (isString(element) && element.charAt(0) != '<') {
      throw jqLiteMinErr('nosel', 'Looking up elements via selectors is not supported by jqLite! See: http://docs.angularjs.org/api/angular.element');
    }
    return new JQLite(element);
  }

  if (isString(element)) {
    var div = document.createElement('div');
    // Read about the NoScope elements here:
    // http://msdn.microsoft.com/en-us/library/ms533897(VS.85).aspx
    div.innerHTML = '<div>&#160;</div>' + element; // IE insanity to make NoScope elements work!
    div.removeChild(div.firstChild); // remove the superfluous div
    jqLiteAddNodes(this, div.childNodes);
    var fragment = jqLite(document.createDocumentFragment());
    fragment.append(this); // detach the elements from the temporary DOM div.
  } else {
    jqLiteAddNodes(this, element);
  }
}

function jqLiteClone(element) {
  return element.cloneNode(true);
}

function jqLiteDealoc(element){
  jqLiteRemoveData(element);
  for ( var i = 0, children = element.childNodes || []; i < children.length; i++) {
    jqLiteDealoc(children[i]);
  }
}

function jqLiteOff(element, type, fn, unsupported) {
  if (isDefined(unsupported)) throw jqLiteMinErr('offargs', 'jqLite#off() does not support the `selector` argument');

  var events = jqLiteExpandoStore(element, 'events'),
      handle = jqLiteExpandoStore(element, 'handle');

  if (!handle) return; //no listeners registered

  if (isUndefined(type)) {
    forEach(events, function(eventHandler, type) {
      removeEventListenerFn(element, type, eventHandler);
      delete events[type];
    });
  } else {
    forEach(type.split(' '), function(type) {
      if (isUndefined(fn)) {
        removeEventListenerFn(element, type, events[type]);
        delete events[type];
      } else {
        arrayRemove(events[type] || [], fn);
      }
    });
  }
}

function jqLiteRemoveData(element, name) {
  var expandoId = element[jqName],
      expandoStore = jqCache[expandoId];

  if (expandoStore) {
    if (name) {
      delete jqCache[expandoId].data[name];
      return;
    }

    if (expandoStore.handle) {
      expandoStore.events.$destroy && expandoStore.handle({}, '$destroy');
      jqLiteOff(element);
    }
    delete jqCache[expandoId];
    element[jqName] = undefined; // ie does not allow deletion of attributes on elements.
  }
}

function jqLiteExpandoStore(element, key, value) {
  var expandoId = element[jqName],
      expandoStore = jqCache[expandoId || -1];

  if (isDefined(value)) {
    if (!expandoStore) {
      element[jqName] = expandoId = jqNextId();
      expandoStore = jqCache[expandoId] = {};
    }
    expandoStore[key] = value;
  } else {
    return expandoStore && expandoStore[key];
  }
}

function jqLiteData(element, key, value) {
  var data = jqLiteExpandoStore(element, 'data'),
      isSetter = isDefined(value),
      keyDefined = !isSetter && isDefined(key),
      isSimpleGetter = keyDefined && !isObject(key);

  if (!data && !isSimpleGetter) {
    jqLiteExpandoStore(element, 'data', data = {});
  }

  if (isSetter) {
    data[key] = value;
  } else {
    if (keyDefined) {
      if (isSimpleGetter) {
        // don't create data in this case.
        return data && data[key];
      } else {
        extend(data, key);
      }
    } else {
      return data;
    }
  }
}

function jqLiteHasClass(element, selector) {
  if (!element.getAttribute) return false;
  return ((" " + (element.getAttribute('class') || '') + " ").replace(/[\n\t]/g, " ").
      indexOf( " " + selector + " " ) > -1);
}

function jqLiteRemoveClass(element, cssClasses) {
  if (cssClasses && element.setAttribute) {
    forEach(cssClasses.split(' '), function(cssClass) {
      element.setAttribute('class', trim(
          (" " + (element.getAttribute('class') || '') + " ")
          .replace(/[\n\t]/g, " ")
          .replace(" " + trim(cssClass) + " ", " "))
      );
    });
  }
}

function jqLiteAddClass(element, cssClasses) {
  if (cssClasses && element.setAttribute) {
    var existingClasses = (' ' + (element.getAttribute('class') || '') + ' ')
                            .replace(/[\n\t]/g, " ");

    forEach(cssClasses.split(' '), function(cssClass) {
      cssClass = trim(cssClass);
      if (existingClasses.indexOf(' ' + cssClass + ' ') === -1) {
        existingClasses += cssClass + ' ';
      }
    });

    element.setAttribute('class', trim(existingClasses));
  }
}

function jqLiteAddNodes(root, elements) {
  if (elements) {
    elements = (!elements.nodeName && isDefined(elements.length) && !isWindow(elements))
      ? elements
      : [ elements ];
    for(var i=0; i < elements.length; i++) {
      root.push(elements[i]);
    }
  }
}

function jqLiteController(element, name) {
  return jqLiteInheritedData(element, '$' + (name || 'ngController' ) + 'Controller');
}

function jqLiteInheritedData(element, name, value) {
  element = jqLite(element);

  // if element is the document object work with the html element instead
  // this makes $(document).scope() possible
  if(element[0].nodeType == 9) {
    element = element.find('html');
  }
  var names = isArray(name) ? name : [name];

  while (element.length) {

    for (var i = 0, ii = names.length; i < ii; i++) {
      if ((value = element.data(names[i])) !== undefined) return value;
    }
    element = element.parent();
  }
}

//////////////////////////////////////////
// Functions which are declared directly.
//////////////////////////////////////////
var JQLitePrototype = JQLite.prototype = {
  ready: function(fn) {
    var fired = false;

    function trigger() {
      if (fired) return;
      fired = true;
      fn();
    }

    // check if document already is loaded
    if (document.readyState === 'complete'){
      setTimeout(trigger);
    } else {
      this.on('DOMContentLoaded', trigger); // works for modern browsers and IE9
      // we can not use jqLite since we are not done loading and jQuery could be loaded later.
      // jshint -W064
      JQLite(window).on('load', trigger); // fallback to window.onload for others
      // jshint +W064
    }
  },
  toString: function() {
    var value = [];
    forEach(this, function(e){ value.push('' + e);});
    return '[' + value.join(', ') + ']';
  },

  eq: function(index) {
      return (index >= 0) ? jqLite(this[index]) : jqLite(this[this.length + index]);
  },

  length: 0,
  push: push,
  sort: [].sort,
  splice: [].splice
};

//////////////////////////////////////////
// Functions iterating getter/setters.
// these functions return self on setter and
// value on get.
//////////////////////////////////////////
var BOOLEAN_ATTR = {};
forEach('multiple,selected,checked,disabled,readOnly,required,open'.split(','), function(value) {
  BOOLEAN_ATTR[lowercase(value)] = value;
});
var BOOLEAN_ELEMENTS = {};
forEach('input,select,option,textarea,button,form,details'.split(','), function(value) {
  BOOLEAN_ELEMENTS[uppercase(value)] = true;
});

function getBooleanAttrName(element, name) {
  // check dom last since we will most likely fail on name
  var booleanAttr = BOOLEAN_ATTR[name.toLowerCase()];

  // booleanAttr is here twice to minimize DOM access
  return booleanAttr && BOOLEAN_ELEMENTS[element.nodeName] && booleanAttr;
}

forEach({
  data: jqLiteData,
  inheritedData: jqLiteInheritedData,

  scope: function(element) {
    // Can't use jqLiteData here directly so we stay compatible with jQuery!
    return jqLite(element).data('$scope') || jqLiteInheritedData(element.parentNode || element, ['$isolateScope', '$scope']);
  },

  isolateScope: function(element) {
    // Can't use jqLiteData here directly so we stay compatible with jQuery!
    return jqLite(element).data('$isolateScope') || jqLite(element).data('$isolateScopeNoTemplate');
  },

  controller: jqLiteController ,

  injector: function(element) {
    return jqLiteInheritedData(element, '$injector');
  },

  removeAttr: function(element,name) {
    element.removeAttribute(name);
  },

  hasClass: jqLiteHasClass,

  css: function(element, name, value) {
    name = camelCase(name);

    if (isDefined(value)) {
      element.style[name] = value;
    } else {
      var val;

      if (msie <= 8) {
        // this is some IE specific weirdness that jQuery 1.6.4 does not sure why
        val = element.currentStyle && element.currentStyle[name];
        if (val === '') val = 'auto';
      }

      val = val || element.style[name];

      if (msie <= 8) {
        // jquery weirdness :-/
        val = (val === '') ? undefined : val;
      }

      return  val;
    }
  },

  attr: function(element, name, value){
    var lowercasedName = lowercase(name);
    if (BOOLEAN_ATTR[lowercasedName]) {
      if (isDefined(value)) {
        if (!!value) {
          element[name] = true;
          element.setAttribute(name, lowercasedName);
        } else {
          element[name] = false;
          element.removeAttribute(lowercasedName);
        }
      } else {
        return (element[name] ||
                 (element.attributes.getNamedItem(name)|| noop).specified)
               ? lowercasedName
               : undefined;
      }
    } else if (isDefined(value)) {
      element.setAttribute(name, value);
    } else if (element.getAttribute) {
      // the extra argument "2" is to get the right thing for a.href in IE, see jQuery code
      // some elements (e.g. Document) don't have get attribute, so return undefined
      var ret = element.getAttribute(name, 2);
      // normalize non-existing attributes to undefined (as jQuery)
      return ret === null ? undefined : ret;
    }
  },

  prop: function(element, name, value) {
    if (isDefined(value)) {
      element[name] = value;
    } else {
      return element[name];
    }
  },

  text: (function() {
    var NODE_TYPE_TEXT_PROPERTY = [];
    if (msie < 9) {
      NODE_TYPE_TEXT_PROPERTY[1] = 'innerText';    /** Element **/
      NODE_TYPE_TEXT_PROPERTY[3] = 'nodeValue';    /** Text **/
    } else {
      NODE_TYPE_TEXT_PROPERTY[1] =                 /** Element **/
      NODE_TYPE_TEXT_PROPERTY[3] = 'textContent';  /** Text **/
    }
    getText.$dv = '';
    return getText;

    function getText(element, value) {
      var textProp = NODE_TYPE_TEXT_PROPERTY[element.nodeType];
      if (isUndefined(value)) {
        return textProp ? element[textProp] : '';
      }
      element[textProp] = value;
    }
  })(),

  val: function(element, value) {
    if (isUndefined(value)) {
      if (nodeName_(element) === 'SELECT' && element.multiple) {
        var result = [];
        forEach(element.options, function (option) {
          if (option.selected) {
            result.push(option.value || option.text);
          }
        });
        return result.length === 0 ? null : result;
      }
      return element.value;
    }
    element.value = value;
  },

  html: function(element, value) {
    if (isUndefined(value)) {
      return element.innerHTML;
    }
    for (var i = 0, childNodes = element.childNodes; i < childNodes.length; i++) {
      jqLiteDealoc(childNodes[i]);
    }
    element.innerHTML = value;
  }
}, function(fn, name){
  /**
   * Properties: writes return selection, reads return first value
   */
  JQLite.prototype[name] = function(arg1, arg2) {
    var i, key;

    // jqLiteHasClass has only two arguments, but is a getter-only fn, so we need to special-case it
    // in a way that survives minification.
    if (((fn.length == 2 && (fn !== jqLiteHasClass && fn !== jqLiteController)) ? arg1 : arg2) === undefined) {
      if (isObject(arg1)) {

        // we are a write, but the object properties are the key/values
        for(i=0; i < this.length; i++) {
          if (fn === jqLiteData) {
            // data() takes the whole object in jQuery
            fn(this[i], arg1);
          } else {
            for (key in arg1) {
              fn(this[i], key, arg1[key]);
            }
          }
        }
        // return self for chaining
        return this;
      } else {
        // we are a read, so read the first child.
        var value = fn.$dv;
        // Only if we have $dv do we iterate over all, otherwise it is just the first element.
        var jj = (value === undefined) ? Math.min(this.length, 1) : this.length;
        for (var j = 0; j < jj; j++) {
          var nodeValue = fn(this[j], arg1, arg2);
          value = value ? value + nodeValue : nodeValue;
        }
        return value;
      }
    } else {
      // we are a write, so apply to all children
      for(i=0; i < this.length; i++) {
        fn(this[i], arg1, arg2);
      }
      // return self for chaining
      return this;
    }
  };
});

function createEventHandler(element, events) {
  var eventHandler = function (event, type) {
    if (!event.preventDefault) {
      event.preventDefault = function() {
        event.returnValue = false; //ie
      };
    }

    if (!event.stopPropagation) {
      event.stopPropagation = function() {
        event.cancelBubble = true; //ie
      };
    }

    if (!event.target) {
      event.target = event.srcElement || document;
    }

    if (isUndefined(event.defaultPrevented)) {
      var prevent = event.preventDefault;
      event.preventDefault = function() {
        event.defaultPrevented = true;
        prevent.call(event);
      };
      event.defaultPrevented = false;
    }

    event.isDefaultPrevented = function() {
      return event.defaultPrevented || event.returnValue === false;
    };

    forEach(events[type || event.type], function(fn) {
      fn.call(element, event);
    });

    // Remove monkey-patched methods (IE),
    // as they would cause memory leaks in IE8.
    if (msie <= 8) {
      // IE7/8 does not allow to delete property on native object
      event.preventDefault = null;
      event.stopPropagation = null;
      event.isDefaultPrevented = null;
    } else {
      // It shouldn't affect normal browsers (native methods are defined on prototype).
      delete event.preventDefault;
      delete event.stopPropagation;
      delete event.isDefaultPrevented;
    }
  };
  eventHandler.elem = element;
  return eventHandler;
}

//////////////////////////////////////////
// Functions iterating traversal.
// These functions chain results into a single
// selector.
//////////////////////////////////////////
forEach({
  removeData: jqLiteRemoveData,

  dealoc: jqLiteDealoc,

  on: function onFn(element, type, fn, unsupported){
    if (isDefined(unsupported)) throw jqLiteMinErr('onargs', 'jqLite#on() does not support the `selector` or `eventData` parameters');

    var events = jqLiteExpandoStore(element, 'events'),
        handle = jqLiteExpandoStore(element, 'handle');

    if (!events) jqLiteExpandoStore(element, 'events', events = {});
    if (!handle) jqLiteExpandoStore(element, 'handle', handle = createEventHandler(element, events));

    forEach(type.split(' '), function(type){
      var eventFns = events[type];

      if (!eventFns) {
        if (type == 'mouseenter' || type == 'mouseleave') {
          var contains = document.body.contains || document.body.compareDocumentPosition ?
          function( a, b ) {
            // jshint bitwise: false
            var adown = a.nodeType === 9 ? a.documentElement : a,
            bup = b && b.parentNode;
            return a === bup || !!( bup && bup.nodeType === 1 && (
              adown.contains ?
              adown.contains( bup ) :
              a.compareDocumentPosition && a.compareDocumentPosition( bup ) & 16
              ));
            } :
            function( a, b ) {
              if ( b ) {
                while ( (b = b.parentNode) ) {
                  if ( b === a ) {
                    return true;
                  }
                }
              }
              return false;
            };

          events[type] = [];

          // Refer to jQuery's implementation of mouseenter & mouseleave
          // Read about mouseenter and mouseleave:
          // http://www.quirksmode.org/js/events_mouse.html#link8
          var eventmap = { mouseleave : "mouseout", mouseenter : "mouseover"};

          onFn(element, eventmap[type], function(event) {
            var target = this, related = event.relatedTarget;
            // For mousenter/leave call the handler if related is outside the target.
            // NB: No relatedTarget if the mouse left/entered the browser window
            if ( !related || (related !== target && !contains(target, related)) ){
              handle(event, type);
            }
          });

        } else {
          addEventListenerFn(element, type, handle);
          events[type] = [];
        }
        eventFns = events[type];
      }
      eventFns.push(fn);
    });
  },

  off: jqLiteOff,

  replaceWith: function(element, replaceNode) {
    var index, parent = element.parentNode;
    jqLiteDealoc(element);
    forEach(new JQLite(replaceNode), function(node){
      if (index) {
        parent.insertBefore(node, index.nextSibling);
      } else {
        parent.replaceChild(node, element);
      }
      index = node;
    });
  },

  children: function(element) {
    var children = [];
    forEach(element.childNodes, function(element){
      if (element.nodeType === 1)
        children.push(element);
    });
    return children;
  },

  contents: function(element) {
    return element.childNodes || [];
  },

  append: function(element, node) {
    forEach(new JQLite(node), function(child){
      if (element.nodeType === 1 || element.nodeType === 11) {
        element.appendChild(child);
      }
    });
  },

  prepend: function(element, node) {
    if (element.nodeType === 1) {
      var index = element.firstChild;
      forEach(new JQLite(node), function(child){
        element.insertBefore(child, index);
      });
    }
  },

  wrap: function(element, wrapNode) {
    wrapNode = jqLite(wrapNode)[0];
    var parent = element.parentNode;
    if (parent) {
      parent.replaceChild(wrapNode, element);
    }
    wrapNode.appendChild(element);
  },

  remove: function(element) {
    jqLiteDealoc(element);
    var parent = element.parentNode;
    if (parent) parent.removeChild(element);
  },

  after: function(element, newElement) {
    var index = element, parent = element.parentNode;
    forEach(new JQLite(newElement), function(node){
      parent.insertBefore(node, index.nextSibling);
      index = node;
    });
  },

  addClass: jqLiteAddClass,
  removeClass: jqLiteRemoveClass,

  toggleClass: function(element, selector, condition) {
    if (isUndefined(condition)) {
      condition = !jqLiteHasClass(element, selector);
    }
    (condition ? jqLiteAddClass : jqLiteRemoveClass)(element, selector);
  },

  parent: function(element) {
    var parent = element.parentNode;
    return parent && parent.nodeType !== 11 ? parent : null;
  },

  next: function(element) {
    if (element.nextElementSibling) {
      return element.nextElementSibling;
    }

    // IE8 doesn't have nextElementSibling
    var elm = element.nextSibling;
    while (elm != null && elm.nodeType !== 1) {
      elm = elm.nextSibling;
    }
    return elm;
  },

  find: function(element, selector) {
    return element.getElementsByTagName(selector);
  },

  clone: jqLiteClone,

  triggerHandler: function(element, eventName, eventData) {
    var eventFns = (jqLiteExpandoStore(element, 'events') || {})[eventName];

    eventData = eventData || [];

    var event = [{
      preventDefault: noop,
      stopPropagation: noop
    }];

    forEach(eventFns, function(fn) {
      fn.apply(element, event.concat(eventData));
    });
  }
}, function(fn, name){
  /**
   * chaining functions
   */
  JQLite.prototype[name] = function(arg1, arg2, arg3) {
    var value;
    for(var i=0; i < this.length; i++) {
      if (isUndefined(value)) {
        value = fn(this[i], arg1, arg2, arg3);
        if (isDefined(value)) {
          // any function which returns a value needs to be wrapped
          value = jqLite(value);
        }
      } else {
        jqLiteAddNodes(value, fn(this[i], arg1, arg2, arg3));
      }
    }
    return isDefined(value) ? value : this;
  };

  // bind legacy bind/unbind to on/off
  JQLite.prototype.bind = JQLite.prototype.on;
  JQLite.prototype.unbind = JQLite.prototype.off;
});