How can I get the data from a POST request using Plotly Dash Callbacks function. Django

Dash Python
1

I’m working with node js and django data connection. I have this middleware using node js that can send data using post request

my node.js

const payload = mydata;
        //POST payload to django
        var obj = { data: payload };
        jsonobj = JSON.stringify(obj);
        var XMLHttpRequest = require("xhr2");
        var xhr = new XMLHttpRequest();
        xhr.open("POST", "http://127.0.0.1:8000/", true);
        xhr.setRequestHeader("Content-Type", "application/json;charset=UTF-8");
        xhr.send(jsonobj);

And I can access that data in my django project views.py using this following code. It’s printing the data that node js sent.

from django.views.decorators.csrf import csrf_exempt
import json

@csrf_exempt
def overview(request):
    if request.method == 'POST':
    post_data = json.loads(request.body.decode("utf-8"))
    value = post_data.get('data')
    print(value)

    return render(request, 'myhtml')

In my urls.py

from iot import views as iotviews

urlpatterns = [
    path('path/', iotviews.overview),
]

now, I’m trying to use the data in my Plotly Dash. I’m going to use the data to generate a graph. But it’s not working unlike in views.py

graph.py

app = DjangoDash("SimpleExample")
    app.layout = html.Div([
        html.Div(style={'display': 'flex'}, children=[
            dcc.Graph(
                id='graph-ph',
                figure={
                    'data': [
                        {'x':  [],
                         'y': [],
                         'mode':'lines+markers',
                         }],
                    'layout': {
                        'title': 'pH (pH)',
    
                    }},
            ),
    ])
    @app.callback(Output('graph-ph', 'figure'),
                  [Input('interval-graph-update', 'n_intervals')],
                  [State('graph-ph', 'figure')])
        def update_extend_traces_traceselect(n_intervals, fig_raw, request):
            if request.method == 'POST':
                post_data = json.loads(request.body.decode("utf-8"))
                value = post_data.get('data')
                print(value)
        
if "SimpleExample" == '__main__':
    app.run_server(debug=True)

I think I can’t use request as an argument to every function in django. It has to be a view function. If it is a regular function, it will not recognize request. Is there another way to get the data?

2

This is a common request; you need to pass parameters from your request to the Django view that includes the Dash app. See here for the relevant part of the template tag documentation.