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Use a srcdoc attribute on iframes #96

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Jun 28, 2021
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Use a srcdoc attribute on iframes #96

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31 changes: 7 additions & 24 deletions branca/element.py
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Original file line number Diff line number Diff line change
Expand Up @@ -7,10 +7,10 @@
"""

import base64
from html import escape
import json
import warnings
from collections import OrderedDict
import urllib.parse
from urllib.request import urlopen
from uuid import uuid4

Expand Down Expand Up @@ -320,43 +320,26 @@ def render(self, **kwargs):
return self._template.render(this=self, kwargs=kwargs)

def _repr_html_(self, **kwargs):
"""Displays the Figure in a Jupyter notebook.

Percent-encoded HTML is stored in data-html attribute, which is used to populate
the iframe. This approach does not encounter the 2MB limit in Chrome for storing
the HTML in the src attribute with a data URI. The alternative of using a srcdoc
attribute is not supported in Microsoft Internet Explorer and Edge.

"""
html = urllib.parse.quote(self.render(**kwargs))
onload = (
'this.contentDocument.open();'
'this.contentDocument.write('
' decodeURIComponent(this.getAttribute(\'data-html\'))'
');'
'this.contentDocument.close();'
)

"""Displays the Figure in a Jupyter notebook."""
html = escape(self.render(**kwargs))
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if self.height is None:
iframe = (
'<div style="width:{width};">'
'<div style="position:relative;width:100%;height:0;padding-bottom:{ratio};">' # noqa
'<span style="color:#565656">Make this Notebook Trusted to load map: File -> Trust Notebook</span>' # noqa
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'<iframe src="about:blank" style="position:absolute;width:100%;height:100%;left:0;top:0;' # noqa
'<iframe srcdoc="{html}" style="position:absolute;width:100%;height:100%;left:0;top:0;' # noqa
'border:none !important;" '
'data-html={html} onload="{onload}" '
'allowfullscreen webkitallowfullscreen mozallowfullscreen>'
'</iframe>'
'</div></div>'
).format(html=html, onload=onload, width=self.width, ratio=self.ratio)
).format(html=html, width=self.width, ratio=self.ratio)
else:
iframe = (
'<iframe src="about:blank" width="{width}" height="{height}"'
'<iframe srcdoc="{html}" width="{width}" height="{height}"'
'style="border:none !important;" '
'data-html={html} onload="{onload}" '
'"allowfullscreen" "webkitallowfullscreen" "mozallowfullscreen">'
'</iframe>'
).format(html=html, onload=onload, width=self.width, height=self.height)
).format(html=html, width=self.width, height=self.height)
return iframe

def add_subplot(self, x, y, n, margin=0.05):
Expand Down