Simpler method to send value from javascript to python

🎈 Using Streamlit
1

I’ve used a st.components.v1.iframe to integrate an authentication mechanism that sends back a token to the parent if the user is allowed to authenticate, the iframe content looks like this:

    <script src="remote/auth.js"></script>
    <script>
      token = window.getAuth();
      parent.postMessage(token, '*');
    </script>

and in the streamlit app:

from streamlit.components.v1 import html, iframe
html("""
<script>
    parent.window.addEventListener('message', e => {
        const key = e.message ? 'message' : 'data';
        const token = e[key];
        parent.window.token = token;
    },false);
</script>
""")
iframe("RemoteIframeLocation")

Now what I want is to send back the parent.window.token to the python back-end in order to grant access to users based on the token.

I’m aware that basically this should be possible with bi-directional streamlit components, but it seems like it’s way too complicated and an overkill for my use case where I only need to send one value !

1 Like
2

Hi @Abdelgha_4,

If you are able to retrieve the token, perhaps you can use f-strings to combine the token with your Python statements.

Best regards,
Chanin

3

Hello, thank you for your response

Actually since the token is generated at js side (front end) there is no way that f-strings in the backend would be able to read it.

The main problem is how to communicante the token generated in the iframe back to python backend.

4

Hello All,

I’ve found a solution to this issue using the streamlit_javascript package:

while True:
    return_value = st_javascript('parent.window.token')
    if return_value:
        break
    time.sleep(1)
2 Likes
5

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