fix minor bugs in export as (nbconvert) example

examples/Interactive Widgets/Export As (nbconvert).ipynb

@@ -1,186 +1,188 b''
 {
  "metadata": {
   "name": ""
  },
  "nbformat": 3,
  "nbformat_minor": 0,
  "worksheets": [
   {
    "cells": [
     {
      "cell_type": "code",
      "collapsed": false,
      "input": [
       "# Widget related imports\n",
       "from IPython.html import widgets\n",
       "from IPython.display import display, clear_output, Javascript\n",
       "from IPython.utils.traitlets import Unicode\n",
       "\n",
       "# nbconvert related imports\n",
       "from IPython.nbconvert import get_export_names, export_by_name\n",
       "from IPython.nbconvert.writers import FilesWriter\n",
       "from IPython.nbformat import current"
+      "from IPython.nbconvert.utils.exceptions import ConversionException\n",
+
      ],
      "language": "python",
      "metadata": {},
      "outputs": [],
      "prompt_number": 1
     },
     {
      "cell_type": "markdown",
      "metadata": {},
      "source": [
       "Create a text Widget without displaying it.  The widget will be used to store the notebook's name which is otherwise only available in the front-end."
      ]
     },
     {
      "cell_type": "code",
      "collapsed": false,
      "input": [
       "notebook_name = widgets.TextWidget()"
      ],
      "language": "python",
      "metadata": {},
      "outputs": [],
      "prompt_number": 2
     },
     {
      "cell_type": "markdown",
      "metadata": {},
      "source": [
       "Get the current notebook's name by pushing JavaScript to the browser that sets the notebook name in a string widget."
      ]
     },
     {
      "cell_type": "code",
      "collapsed": false,
      "input": [
       "js = \"\"\"var model = IPython.notebook.kernel.widget_manager.get_model('{model_id}');\n",
       "model.set('value', IPython.notebook.notebook_name);\n",
       "model.save();\"\"\".format(model_id=notebook_name.model_id)\n",
       "display(Javascript(data=js))"
      ],
      "language": "python",
      "metadata": {},
      "outputs": [
       {
        "javascript": [
         "var model = IPython.notebook.kernel.widget_manager.get_model('8c6583524eb3422c99491730a3e1ce6c');\n",
         "model.set('value', IPython.notebook.notebook_name);\n",
         "model.save();"
        ],
        "metadata": {},
        "output_type": "display_data",
        "text": [
         "<IPython.core.display.Javascript at 0x164ea50>"
        ]
       }
      ],
      "prompt_number": 3
     },
     {
      "cell_type": "code",
      "collapsed": false,
      "input": [
       "filename = notebook_name.value\n",
       "filename"
      ],
      "language": "python",
      "metadata": {},
      "outputs": [
       {
        "metadata": {},
        "output_type": "pyout",
        "prompt_number": 4,
        "text": [
         "u'Export As (nbconvert).ipynb'"
        ]
       }
      ],
      "prompt_number": 4
     },
     {
      "cell_type": "markdown",
      "metadata": {},
      "source": [
       "Create the widget that will allow the user to Export the current notebook."
      ]
     },
     {
      "cell_type": "code",
      "collapsed": false,
      "input": [
       "exporter_names = widgets.DropdownWidget(values=get_export_names(), value='html')\n",
       "export_button = widgets.ButtonWidget(description=\"Export\")\n",
       "download_link = widgets.HTMLWidget(visible=False)"
      ],
      "language": "python",
      "metadata": {},
      "outputs": [],
      "prompt_number": 5
     },
     {
      "cell_type": "markdown",
      "metadata": {},
      "source": [
       "Export the notebook when the export button is clicked."
      ]
     },
     {
      "cell_type": "code",
      "collapsed": false,
      "input": [
       "file_writer = FilesWriter()\n",
       "\n",
       "def export(name, nb):\n",
       "    \n",
       "    # Get a unique key for the notebook and set it in the resources object.\n",
       "    notebook_name = name[:name.rfind('.')]\n",
       "    resources = {}\n",
       "    resources['unique_key'] = notebook_name\n",
       "    resources['output_files_dir'] = '%s_files' % notebook_name\n",
       "\n",
       "    # Try to export\n",
       "    try:\n",
       "        output, resources = export_by_name(exporter_names.value, nb)\n",
       "    except ConversionException as e:\n",
       "        download_link.value = \"<br>Could not export notebook!\"\n",
       "    else:\n",
       "        write_results = file_writer.write(output, resources, notebook_name=notebook_name)\n",
       "    \n",
       "        download_link.value = \"<br>Results: <a href='files/{filename}'><i>\\\"{filename}\\\"</i></a>\".format(filename=write_results)\n",
       "        download_link.visible = True\n",
       "        \n",
-      "def handle_export():\n",
+      "def handle_export(widget):\n",
       "    with open(filename, 'r') as f:\n",
       "        export(filename, current.read(f, 'json'))\n",
       "export_button.on_click(handle_export)"
      ],
      "language": "python",
      "metadata": {},
      "outputs": [],
      "prompt_number": 6
     },
     {
      "cell_type": "markdown",
      "metadata": {},
      "source": [
       "Display the controls."
      ]
     },
     {
      "cell_type": "code",
      "collapsed": false,
      "input": [
       "display(exporter_names, export_button, download_link)"
      ],
      "language": "python",
      "metadata": {},
      "outputs": [],
      "prompt_number": 7
     }
    ],
    "metadata": {}
   }
  ]
 }