Update widget basics with some information about the placeholder

examples/Interactive Widgets/Widget Basics.ipynb

@@ -7,7 +7,7 b''
    ]
   ],
   "name": "",
-  "signature": "sha256:9a70b52f0b16861d1cd6a8342b233247958977a52bde8d3efd69d21131ce1926"
+  "signature": "sha256:5ac3a85c8bb2f9bb3cd63b524bbb626ab1531176b43a109d13f5d7794f805eee"
  },
  "nbformat": 3,
  "nbformat_minor": 0,
@@ -31,7 +31,7 b''
      "language": "python",
      "metadata": {},
      "outputs": [],
-     "prompt_number": 1
+     "prompt_number": 2
     },
     {
      "cell_type": "heading",
@@ -298,6 +298,39 b''
       }
      ],
      "prompt_number": 10
+    },
+    {
+     "cell_type": "markdown",
+     "metadata": {},
+     "source": [
+      "Some widgets have special attributes. For example, text boxes and text areas can specify the `placeholder` attribute, which will set \"placeholder\" text to be displayed before the user has typed anything:"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "mytextwidget = widgets.TextWidget()\n",
+      "mytextwidget.placeholder = \"type something here\"\n",
+      "display(mytextwidget)"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [],
+     "prompt_number": 4
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "mytextareawidget = widgets.TextareaWidget()\n",
+      "mytextareawidget.placeholder = \"your text here\"\n",
+      "display(mytextareawidget)"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [],
+     "prompt_number": 5
     }
    ],
    "metadata": {}