graph: fixed bug with empty nodeset hierarchical layout #145

HISTORY.md

@@ -9,6 +9,10 @@ http://visjs.org
 - Fixed `Timeline.clear()` not resetting a configured `options.start` and 
   `options.end`.
 
+### Graph
+
+- Fixed error with zero nodes with hierarchical layout.
+
 
 ## 2014-05-28, version 1.0.2
 

dist/vis.js

@@ -5,7 +5,7 @@
  * A dynamic, browser-based visualization library.
  *
  * @version 1.0.3-SNAPSHOT
- * @date    2014-05-28
+ * @date    2014-06-02
  *
  * @license
  * Copyright (C) 2011-2014 Almende B.V, http://almende.com
@@ -12271,7 +12271,7 @@ var HierarchicalLayoutMixin = {
    * @private
    */
   _setupHierarchicalLayout : function() {
-    if (this.constants.hierarchicalLayout.enabled == true) {
+    if (this.constants.hierarchicalLayout.enabled == true && this.nodeIndices.length > 0) {
       if (this.constants.hierarchicalLayout.direction == "RL" || this.constants.hierarchicalLayout.direction == "DU") {
         this.constants.hierarchicalLayout.levelSeparation *= -1;
       }

src/graph/graphMixins/HierarchicalLayoutMixin.js

@@ -20,7 +20,7 @@ var HierarchicalLayoutMixin = {
    * @private
    */
   _setupHierarchicalLayout : function() {
-    if (this.constants.hierarchicalLayout.enabled == true) {
+    if (this.constants.hierarchicalLayout.enabled == true && this.nodeIndices.length > 0) {
       if (this.constants.hierarchicalLayout.direction == "RL" || this.constants.hierarchicalLayout.direction == "DU") {
         this.constants.hierarchicalLayout.levelSeparation *= -1;
       }