Add scroll_to_bottom method for TextAreaView (StringWidget).

IPython/html/static/notebook/js/widgets/string.js

@@ -63,6 +63,14 @@ define(["notebook/js/widget"], function(widget_manager){
                 this.$textbox.val(this.model.get('value'));
             }
 
+            if (this.last_scroll_to_bottom == undefined) {
+                this.last_scroll_to_bottom = 0;
+            }
+            if (this.last_scroll_to_bottom < this.model.get('scroll_to_bottoms')) {
+                this.last_scroll_to_bottom < this.model.get('scroll_to_bottoms');
+                this.$textbox.scrollTop(this.$textbox[0].scrollHeight);
+            }
+
             var disabled = this.model.get('disabled');
             this.$textbox.prop('disabled', disabled);
 

IPython/html/widgets/widget_string.py

@@ -27,11 +27,12 @@ class StringWidget(Widget):
     default_view_name = Unicode('TextBoxView')
 
     # Keys
-    _keys = ['value', 'disabled', 'description', 'submits']
+    _keys = ['value', 'disabled', 'description', 'submits', 'scroll_to_bottoms']
     value = Unicode(help="String value")
     disabled = Bool(False, help="Enable or disable user changes")
     description = Unicode(help="Description of the value this widget represents")
     submits = Int(0, help="Used to capture and fire submission ")
+    scroll_to_bottoms = Int(0, help="Used to scroll a TextAreaView to the bottom")
 
 
     def __init__(self, **kwargs):
@@ -39,6 +40,10 @@ class StringWidget(Widget):
         self._submission_callbacks = []
 
 
+    def scroll_to_bottom(self):
+        self.scroll_to_bottoms += 1
+
+
     def on_submit(self, callback, remove=False):
         """Register a callback to handle text submission (triggered when the 
         user clicks enter).