Question

我目前正在尝试构建一个仪表板，并且在过去的一天中，我一直在努力如何进行回调（可以在下拉菜单中进行多个选择）上进行努力。

我尝试了各种教程，但是我找不到特定代码的问题。

import dash
import dash_core_components as dcc
import dash_html_components as html
from dash.dependencies import Output, Input 
import plotly.graph_objs as go

import pandas as pd

df = pd.read_csv("crude-oil-production2.csv", sep=","  ,index_col=0)

countries = df['COUNTRYNAME'].unique()
Year = df['Year'].unique()

app = dash.Dash()

app.layout = html.Div(children=[
    html.H1(children='Oil Data'),

    html.Div([
        html.Label('Country'),
        dcc.Dropdown(
            id='country',
            options=[{'label': i, 'value': i} for i in countries],
            value='',
            placeholder='Select...',
            multi=False
        )
    ],    
    style={'width': '20%', 'display': 'inline-block', 'margin-bottom': '20px'}),    

    html.Div([
        html.Label('Year'),
        dcc.Dropdown(
            id='Year',
            options=[{'label': i, 'value': i} for i in Year],
            value='',
            placeholder='Select...',
            multi=False
        )
    ],    
    style={'width': '20%', 'display': 'inline-block', 'margin-bottom': '20px'}),   

    html.Div([
        dcc.Graph(id='Country vs Year'),
    ],
    style={'width': '100%'}),
]) 

@app.callback(
    dash.dependencies.Output('Country vs Year', 'figure'),
    [
        dash.dependencies.Input('Year', 'value'),
        dash.dependencies.Input('country', 'value')
    ])
def update_graph(Year, country):
    filtered_df1 = df.loc[df["COUNTRYNAME"] == "Country"]   
    filtered_df = filtered_df1.loc[filtered_df1["Year"] == "Year"]

    data = []
    trace_rate = go.Scatter(x=list(filtered_df.Month),
                             y=list(filtered_df.Thousand_Barrels_per_day__kb_d),
                            name='Oil Data',
                            line=dict(color="#f44242"))
    data.append(trace_rate)

    layout = {"title": "callback graph"}

    return {
        "data":data,
        "layout": layout
        }

if __name__ == '__main__':
    app.run_server(debug=True)

没有错误消息，只是没有有效的回调。选择国家或年份无济于事。

破折号回调不会更新图形

0 个答案: