Hi All,
I have a dropdown-driven dashboard for plotting csv file data. Apart from individual cvs plots, I have to plot a trend chart combined for all the .csv files present in a directory(using only the selected columns for the .csv files. Note: All csv files have same columns, different values.) using plotly express, and add it to this same dashboard. Plotting them and then integrating with the existing dashboard is where I am stuck.
The code has two dropdown,
- First is multi-selection: For selecting the files to be plotted
- Second is single-selection: For column to be considered for plotting
Below is my sample code:-
import dash
from dash import dcc, Input, Output, html, dash_table
import plotly.express as px
import pandas as pd
import os
# import plotly
import plotly.graph_objects as go
# ======================== Dash App
app = dash.Dash( __name__ )
# ======================== Getting input of directory and Latest filename
PATH = str( input( "Enter Full file path" ) ) # Use your path
# LatestFile = str( input( "Enter Full file Name" ) ) # Use your latest filename
### Fetch all files in path
fileNames = os.listdir( PATH )
### Filter file name list for files ending with .csv
fileNames = [file for file in fileNames if '.csv' in file]
print( fileNames )
# ======================== App Layout
app.layout = html.Div( [
html.H1( 'Trend Analytics Dashboard', style={'text-align': 'center', 'background-color': '#ede9e8'} ),
html.Div( [
dcc.Dropdown( id='DropDown_FileName',
options=[
{'label': i, 'value': i} for i in fileNames
],
# value=fileNames,
placeholder='Select Files for Trend Analysis',
multi=True,
clearable=False ),
] ),
html.Div( [
dcc.RadioItems( id='DropDown_Value',
options=[
{'label': 'Average', 'value': 'Average'}, {'label': 'Samples', 'value': 'Samples'},
{'label': 'Throughput', 'value': 'Throughput'}, {'label': 'Comb_wgt', 'value': 'Comb_wgt'}
],
value='Average',
#placeholder='Select a value',
# multi=False,
# clearable=False
),
] ),
html.Div( [
dcc.Graph( id='TrendChart' ),
] ),
] )
@app.callback(
Output( 'TrendChart', 'figure' ),
Input( 'DropDown_FileName', 'value' ), Input( 'DropDown_Value', 'value' )
)
def update_figure(DropDown_FileName, DropDown_Value):
print(DropDown_FileName)
print(type(DropDown_FileName))
for file in DropDown_FileName:
df_comb = pd.read_csv(PATH + file)
df_comb['Comb_wgt'] = df_comb.Samples * df_comb.Average
df_comb.rename( columns={'Label': 'Request'}, inplace=True )
df_comb = (df_comb.sort_values( by='Request', ascending=True ))
df_comb['Average'] = df_comb['Average']/1000
print(df_comb)
TrendChart = px.bar(data_frame=df_comb, x=df_comb['Request'], y=df_comb[DropDown_Value],
color='Request',
title=" Trend Analysis Graph by"+DropDown_Value,
text=df_comb[DropDown_Value],
labels={'Request': 'Request', DropDown_Value: DropDown_Value},
).update_traces(textposition='outside')
return TrendChart
if __name__ == '__main__':
app.run_server()
With the above code, the for loop gets stuck after the first csv file itself. Graph is plotted for just the first file only, while other files are not even read. I checked the return type for âDropDown_FileNameâ, and its coming as list, also the radio selection is working fine.
Somehow the for loop is not working properly and the graph is not getting updated.
Objective is to have data from all csv file present on the same graph for trend analysis that is to say, just update the graph without deleting the previous plots
Thank you in advance.
