observ-style-hook: check that obs is present before calling

mmckegg · Jun 2, 2016 · 9279999 · 9279999
1 parent 9f8bb0b
commit 9279999
Showing 1 changed file with 4 additions and 2 deletions.
diff --git a/lib/observ-style-hook.js b/lib/observ-style-hook.js
@@ -17,7 +17,9 @@ function update(prop, getValue, value){
 
 ObservStyleHook.prototype.hook = function(node, prop, prev){
   var self = this
-  update.call(node, self.prop, self.getValue, self.obs())
+  if (typeof self.obs === 'function') {
+    update.call(node, self.prop, self.getValue, self.obs())
+  }
   if (!prev || prev.obs !== self.obs){
     self.removeListener && self.removeListener()
     if (self.obs){
@@ -35,4 +37,4 @@ ObservStyleHook.prototype.unhook = function(node, prop, next){
   } else {
     this.removeListener && this.removeListener()
   }
-}
+}