Iksi patch 1 (cferdinandi#255)

* Adjust EndLocation when out of scrollable range

Adjust the EndLocation when it’s outside of the scrollable range by checking whether the calculated location is smaller than then document height minus the viewport height.

* v9.1.4
Adjust the endLocation when it’s outside of the scrollable range

Author: cferdinandi

dist/js/smooth-scroll.js

@@ -1,5 +1,5 @@
 /*!
- * smooth-scroll v9.1.3: Animate scrolling to anchor links
+ * smooth-scroll v9.1.4: Animate scrolling to anchor links
  * (c) 2016 Chris Ferdinandi
  * MIT License
  * http://github.com/cferdinandi/smooth-scroll
@@ -289,9 +289,18 @@
 				anchor = anchor.offsetParent;
 			} while (anchor);
 		}
-		location = location - headerHeight - offset;
-		return location >= 0 ? location : 0;
+		location = Math.max(location - headerHeight - offset, 0);
+		return Math.min(location, getDocumentHeight() - getViewportHeight());
 	};
+	
+	/**
+	 * Determine the viewport's height
+	 * @private
+	 * @returns {Number}
+	 */
+	var getViewportHeight = function() {
+        	return Math.max(document.documentElement.clientHeight, window.innerHeight || 0);
+    	};
 
 	/**
 	 * Determine the document's height
@@ -502,4 +511,4 @@
 
 	return smoothScroll;
 
-});
+});

dist/js/smooth-scroll.min.js

@@ -1,5 +1,5 @@
 /*!
- * smooth-scroll v9.1.2: Animate scrolling to anchor links
+ * smooth-scroll v9.1.4: Animate scrolling to anchor links
  * (c) 2016 Chris Ferdinandi
  * MIT License
  * http://github.com/cferdinandi/smooth-scroll
@@ -122,7 +122,7 @@
 		}
 
 		// Get closest match
-		for ( ; elem && elem !== document; elem = elem.parentNode ) {
+		for ( ; elem && elem !== document && elem.nodeType === 1; elem = elem.parentNode ) {
 
 			// If selector is a class
 			if ( firstChar === '.' ) {
@@ -289,9 +289,18 @@
 				anchor = anchor.offsetParent;
 			} while (anchor);
 		}
-		location = location - headerHeight - offset;
-		return location >= 0 ? location : 0;
+		location = Math.max(location - headerHeight - offset, 0);
+		return Math.min(location, getDocumentHeight() - getViewportHeight());
 	};
+	
+	/**
+	 * Determine the viewport's height
+	 * @private
+	 * @returns {Number}
+	 */
+	var getViewportHeight = function() {
+        	return Math.max(document.documentElement.clientHeight, window.innerHeight || 0);
+    	};
 
 	/**
 	 * Determine the document's height
@@ -502,4 +511,4 @@
 
 	return smoothScroll;
 
-});
+});