Make _.isElement more robust. [closes #427]

lodash.js

@@ -77,8 +77,8 @@
   /** Used to assign default `context` object properties */
   var contextProps = [
     'Array', 'Boolean', 'Date', 'Error', 'Function', 'Math', 'Number', 'Object',
-    'RegExp', 'String', '_', 'attachEvent', 'clearTimeout', 'isFinite', 'isNaN',
-    'parseInt', 'setTimeout'
+    'RegExp', 'String', '_', 'clearTimeout', 'document', 'isFinite', 'isNaN',
+    'parseInt', 'setTimeout', 'TypeError', 'window', 'WinRTError'
   ];
 
   /** Used to fix the JScript [[DontEnum]] bug */
@@ -499,6 +499,10 @@
         objectProto = Object.prototype,
         stringProto = String.prototype;
 
+    /** Used to detect DOM support */
+    var window = context.window,
+        document = window && window.document;
+
     /** Used to restore the original `_` reference in `noConflict` */
     var oldDash = context._;
 
@@ -700,6 +704,14 @@
        */
       support.argsObject = arguments.constructor == Object && !(arguments instanceof Array);
 
+      /**
+       * Detect if the DOM is supported.
+       *
+       * @memberOf _.support
+       * @type boolean
+       */
+      support.dom = !!document && typeof document == 'object' && reNative.test(clearTimeout) && reNative.test(setTimeout);
+
       /**
        * Detect if `name` or `message` properties of `Error.prototype` are
        * enumerable by default. (IE < 9, Safari < 5.1)
@@ -1822,7 +1834,7 @@
      * @returns {boolean} Returns `true` if the `value` is a native function, else `false`.
      */
     function isNative(value) {
-      return typeof value == 'function' && reNative.test(value);
+      return typeof value == 'function' && reNative.test(fnToString.call(value));
     }
 
     /**
@@ -2630,7 +2642,15 @@
      * // => true
      */
     function isElement(value) {
-      return value && value.nodeType === 1 || false;
+      return value && typeof value == 'object' && value.nodeType === 1 &&
+        (support.nodeClass ? toString.call(value).indexOf('Element') > -1 : isNode(value)) || false;
+    }
+    // fallback for environments without DOM support
+    if (!support.dom) {
+      isElement = function(value) {
+        return value && typeof value == 'object' && value.nodeType === 1 &&
+          !isPlainObject(value) || false;
+      };
     }
 
     /**