def _ref_js(self, js_source):
js_file = u"_" + os.path.basename(js_source)
try:
if not os.path.exists(js_file):
urlretrieve(js_source, js_file)
_script_src = QUrl.fromLocalFile(QDir.current().filePath(js_file)).toString()
except Exception as exc:
print('Download %s failed, using CDN: %s' % (js_source, exc))
_script_src = js_source
return u"""<script src='""" + _script_src + u"""'></script>"""