Issue
I'm working with plotly and pyqt5 (gui development) and when I try download/export the image generated, this message appear:
js: Uncaught SecurityError: Failed to execute 'toDataURL' on 'HTMLCanvasElement': Tainted canvases may not be exported.
I'm using QtWebengine, the next example:
import plotly.offline as po
import plotly.graph_objs as go
from PyQt5.QtWebEngineWidgets import QWebEngineView
from PyQt5 import QtCore, QtWidgets
import sys
def show_qt(fig):
raw_html = '<html><head><meta charset="utf-8" />'
raw_html += '<script src="https://cdn.plot.ly/plotly-latest.min.js"></script></head>'
raw_html += '<body>'
raw_html += po.plot(fig, include_plotlyjs=False, output_type='div')
raw_html += '</body></html>'
fig_view = QWebEngineView()
# setHtml has a 2MB size limit, need to switch to setUrl on tmp file
# for large figures.
fig_view.setHtml(raw_html)
fig_view.show()
fig_view.raise_()
return fig_view
if __name__ == '__main__':
app = QtWidgets.QApplication(sys.argv)
fig = go.Figure(data=[{'type': 'scattergl', 'y': [2, 1, 3, 1]}])
fig_view = show_qt(fig)
sys.exit(app.exec_())
Solution
This is a warning that warns that the way to download the image (converting it to bytes) can cause a security error but in this case you can ignore it. If you want to download a file then you must use the downloadRequested signal of the QWebEnginePage:
def handle_downloadRequested(item):
path, _ = QtWidgets.QFileDialog.getSaveFileName(
None, "Save File", item.suggestedFileName()
)
if path:
item.setPath(path)
item.accept()
if __name__ == "__main__":
app = QtWidgets.QApplication(sys.argv)
fig = go.Figure(data=[{"type": "scattergl", "y": [2, 1, 3, 1]}])
fig_view = show_qt(fig)
fig_view.page().profile().downloadRequested.connect(
handle_downloadRequested
)
sys.exit(app.exec_())Answered By - eyllanesc
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