jwhendy/plotly-selenium-click.ipynb

## plotly-selenium-click.ipynb
{
 "cells": [
  {
   "metadata": {},
   "cell_type": "markdown",
   "source": "### imports and functions\n\nThis code formalizes [this sketch](https://community.plot.ly/t/use-plotly-offline-to-save-chart-as-image-file/408/25) laid out on the `plotly` community forum by user `broken_symlink`. It uses `selenium` to click the download button. This is an attempt to programmatically save out plot files via `plotly.offline` (do not require authentication with `plotly` servers, and do not open a web page).\n\nRequests for this are very common:\n\n- requests/mentions via `plotly` github: [351](https://github.com/plotly/plotly.py/issues/351), [352](https://github.com/plotly/plotly.py/issues/352), [483](https://github.com/plotly/plotly.py/issues/483), [564](https://github.com/plotly/plotly.py/issues/564), [596](https://github.com/plotly/plotly.py/issues/596), [856](https://github.com/plotly/plotly.py/issues/856), [880](https://github.com/plotly/plotly.py/issues/880)\n- this [question](https://community.plot.ly/t/use-plotly-offline-to-save-chart-as-image-file/408) at the `plotly` community forums\n- [this](https://stackoverflow.com/questions/40243446/how-to-save-plotly-offline-graph-in-format-png) and [this](https://stackoverflow.com/questions/34957790/use-plotly-offline-to-generate-graphs-as-images) on StackOverflow\n\nI couldn't get this to work with `phantomjs`, which was my aim since the original code uses the `firefox` webdriver and actually opens a browser instance. After much googling, it turns out downloading isn't super straihtforward in `phantomjs`.\n\n- [this SO post](https://stackoverflow.com/a/25756960/495990) suggests `phantomjs` doesn't really support downloads\n- another [SO answer](https://stackoverflow.com/a/27911585/495990) that combines `phantomjs` with `urllib` to download\n- [an issue](https://github.com/ariya/phantomjs/issues/10052) going back to 2011 about downloads!\n- [a PR](https://github.com/ariya/phantomjs/pull/14225) that *looks* like downloads was recently merged into `phantomjs`, but I admit I don't know how to use it\n- this [SO answer](https://stackoverflow.com/a/38655474/495990) features using `chromedriver` which is how I ultimiately did this\n\nIn tinkering with the `chromedriver` approach, it appears we can do two things:\n\n- specify `image='type', image_filename='name'` to `plotly.offline.plot()`, which will auto-download the plot upon opening. When using the `selenium` webdriver, we don't have to do anything but load the file.\n- alternatively, the [original sketch](https://community.plot.ly/t/use-plotly-offline-to-save-chart-as-image-file/408/25) used the following (after loading the page):\n\n```\nexport_button = driver.find_element_by_xpath(\"//a[@data-title='Download plot as a png']\")\nexport_button.click()\n```\n\nI didn't use this for two reasons. The first is without needing it... why use it? The second is that I actually ended up getting *two* downloads for each iteration! I discovered that the two relevant options *might* not be mutually exclusive (see [this inquiry](https://community.plot.ly/t/is-image-foo-required-for-image-filename-bar-with-plotly-offline-plot/7476)). Basically, if you pass `image='png'`, the file auto-downloads upon opening... but running the `export_button.click()` *also* downloads it, so you get two files. In addition, removing `image='png'` but leaving `image_filename='name'` seems to ignore the filename so you get `newplot.png` upon the simulated click event.\n\nAt present, it seems best to rely on the auto-download feature as it's simpler and we can specify a filename.\n\nLastly, I had never used `pyvirtualdisplay` before. I didn't think it was necessary, as I was able to run the code just fine and get a file. Out of curiosity, I made a separate `.py` file and ran it *outside* of Jupyter lab and a `chromium` instance popped open and then closed. In addition, I accidentally discovered that you need the `Display()` instance created before the `webdriver`. Speaking from a total noob perspective, in my mind I imagine the browser redirecting to the fake display but only if it exists."
  },
  {
   "metadata": {
    "trusted": true
   },
   "cell_type": "code",
   "source": "import os\nimport pandas as pd\nimport plotly\nimport plotly.graph_objs as go\nimport time\n\nfrom selenium import webdriver\nfrom PIL import Image\nfrom pyvirtualdisplay import Display\n\n      \n### from bokeh/io, slightly modified to avoid their import_required util\n### didn't ultimately use, but leaving in case I figure out how to stick wtih phentomjs\n### - https://github.com/bokeh/bokeh/blob/master/bokeh/io/export.py\ndef create_default_webdriver():\n    '''Return phantomjs enabled webdriver'''\n    phantomjs_path = detect_phantomjs()\n    return webdriver.PhantomJS(executable_path=phantomjs_path, service_log_path=devnull)\n\n\n### based on last SO answer above\n### - https://stackoverflow.com/questions/38615811/how-to-download-a-file-with-python-selenium-and-phantomjs\ndef create_chromedriver_webdriver(dload_path):\n    display = Display(visible=0)\n    display.start()\n    chrome_options = webdriver.ChromeOptions()\n    prefs = {\"download.default_directory\": dload_path}\n    chrome_options.add_experimental_option(\"prefs\", prefs)\n    driver = webdriver.Chrome(chrome_options=chrome_options)\n    return driver, display",
   "execution_count": 1,
   "outputs": []
  },
  {
   "metadata": {},
   "cell_type": "markdown",
   "source": "### create a plot\n\nHere we create some data and save the plot as an html file for reading in"
  },
  {
   "metadata": {
    "trusted": true
   },
   "cell_type": "code",
   "source": "df = pd.DataFrame(\n    {'fruits': ['Apples', 'Pears', 'Nectarines', 'Plums', 'Grapes', 'Strawberries'],\n     'counts': [5, 3, 4, 2, 4, 6] })\n\ndata = [go.Bar(x=df['fruits'],\n               y=df['counts'])]\n\ndload = os.path.expanduser('~/Downloads')\nhtml_file = 'plotly-fruit-plot.html'\nfname = 'plotly-fruit-plot'\n\n### original code contained height/width for the display and chromium webdriver\n### I found they didn't matter; specifying the image size to generate will \n### produce a plot of that size no matter the webdriver\nplotly.offline.plot(data, filename=html_file, auto_open=False,\n                    image_width=1280, image_height=800,\n                    image_filename=fname, image='png')",
   "execution_count": null,
   "outputs": []
  },
  {
   "metadata": {},
   "cell_type": "markdown",
   "source": "### the magic\n\n"
  },
  {
   "metadata": {
    "trusted": true
   },
   "cell_type": "code",
   "source": "### create webdrive, open file, maximize, and sleep\ndriver, display = create_chromedriver_webdriver(dload)\n\ndriver.get('file:///{}'.format(os.path.abspath(html_file)))\n\n# make sure we give the file time to download\ntime.sleep(1)\n\n### was in the SO post and could be a more robust way to wait vs. just sleeping 1sec\n# while not(glob.glob(os.path.join(dl_location, filename))):\n#     time.sleep(1)\n\ndriver.close()\ndisplay.stop()\n\nimage = Image.open('{}.png'.format(os.path.join(dload, fname)))\nimage",
   "execution_count": 3,
   "outputs": [
    {
     "data": {
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      "text/plain": "<PIL.PngImagePlugin.PngImageFile image mode=RGBA size=1280x800 at 0x7F97316DD550>"
     },
     "execution_count": 3,
     "metadata": {},
     "output_type": "execute_result"
    }
   ]
  }
 ],
 "metadata": {
  "kernelspec": {
   "name": "python3",
   "display_name": "Python 3",
   "language": "python"
  },
  "language_info": {
   "name": "python",
   "version": "3.6.3",
   "mimetype": "text/x-python",
   "codemirror_mode": {
    "name": "ipython",
    "version": 3
   },
   "pygments_lexer": "ipython3",
   "nbconvert_exporter": "python",
   "file_extension": ".py"
  }
 },
 "nbformat": 4,
 "nbformat_minor": 2
}