Render dash app layout based on incoming POST request

Dash Python
1

I’m looking to create a dash based graph service serving multiple clients at a time where dash layout can be dynamically created / updated. I understand that dash doesn’t have this kind of ‘push’ functionality so I created a route using dash server and tried to pass the body of POST request to dash app by defining a serve_layout function. But the app doesn’t reload. Following is part of the relevant code:

@server.route(’/draw’, methods = [‘POST’])
def result():
if request.method == ‘POST’:
serve_layout(‘request’)
return render_template(“index.html”)

def serve_layout(post_body):
# Construct layout

dash_app.layout = serve_layout

Any suggestions on how to proceed? Thanks in advance.

2

What kind of changes do you need to make to the layout via the POST request?

3

More than the changes, the primary goal is to create multiple layouts, one for each POST request and keep track of user interactions with the layout. In essence layout-renderer-as-a-service.

4

There was some limited discussion about pub-sub and a React based web-socket receiver. If someone took a lot of the complexity out of this it would solve your requirement of a web server initiated refresh on a callback that watched for new data on the socket. Here is a link to one of those discussions :slight_smile:
https://community.plotly.com/t/support-for-websockets/19348

I know this doesn’t answer your question but that would make dashboarding in DASH next level.

FRWZHR

5

Thanks for the pointer. At least makes me feel better about other people being in a similar boat. :laughing:

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